diff --git a/LateX/main.aux b/LateX/main.aux
index f152d12..2033174 100644
--- a/LateX/main.aux
+++ b/LateX/main.aux
@@ -10,122 +10,122 @@
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diff --git a/LateX/main.fdb_latexmk b/LateX/main.fdb_latexmk
index ddfb947..a548237 100644
--- a/LateX/main.fdb_latexmk
+++ b/LateX/main.fdb_latexmk
@@ -1,7 +1,7 @@
 # Fdb version 4
-["pdflatex"] 1778244769.05929 "/home/computer/projects/fitness-app/LateX/main.tex" "main.pdf" "main" 1778244771.97073 0
+["pdflatex"] 1778328618.43654 "/home/computer/projects/fitness-app/LateX/main.tex" "main.pdf" "main" 1778328621.81028 0
   "/etc/texmf/web2c/texmf.cnf" 1776891072.07073 475 c0e671620eb5563b2130f56340a5fde8 ""
-  "/home/computer/projects/fitness-app/LateX/main.tex" 1778244681.19007 8476 4f7793f213e99c2fab6230bc8d2163a2 ""
+  "/home/computer/projects/fitness-app/LateX/main.tex" 1778328619.29013 8497 f5f270fc8580b2dab1a2441bfd35bc31 ""
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@@ -117,6 +117,7 @@
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   "/usr/share/texlive/texmf-dist/tex/latex/listings/listings.sty" 1677530001 80947 75a96bb4c9f40ae31d54a01d924df2ff ""
+  "/usr/share/texlive/texmf-dist/tex/latex/listings/lstlang1.sty" 1677530001 205154 31132370016e8c97e49bc3862419679b ""
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   "/usr/share/texlive/texmf-dist/tex/latex/microtype/microtype.cfg" 1678741534 26842 05a01d67d23e805520393a049533b8c0 ""
@@ -134,16 +135,17 @@
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-  "main.aux" 1778244771.83832 63855 4c52e1a5c85714f95fa215552b7321a7 "pdflatex"
-  "main.out" 1778244770.69833 0 d41d8cd98f00b204e9800998ecf8427e "pdflatex"
-  "main.tex" 1778244681.19007 8476 4f7793f213e99c2fab6230bc8d2163a2 ""
-  "main.toc" 1778244771.85532 9953 4cb30a3bd0faa13d5f22ee47f5497472 "pdflatex"
+  "main.aux" 1778328621.6741 81084 a0cf6c44cf98fdec6d02e75d97a16b77 "pdflatex"
+  "main.out" 1778328620.22748 0 d41d8cd98f00b204e9800998ecf8427e "pdflatex"
+  "main.tex" 1778328619.29013 8497 f5f270fc8580b2dab1a2441bfd35bc31 ""
+  "main.toc" 1778328621.6951 12758 2058fc41ed91a43ee7e8ff6187fae142 "pdflatex"
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+  "step_07.tex" 1778328621.28742 13953 f2a60af4bc72f800633cd952698f82be ""
   (generated)
   "main.aux"
   "main.log"
diff --git a/LateX/main.fls b/LateX/main.fls
index 193d90c..b7a309b 100644
--- a/LateX/main.fls
+++ b/LateX/main.fls
@@ -282,6 +282,15 @@ INPUT step_05.tex
 INPUT ./step_06.tex
 INPUT ./step_06.tex
 INPUT step_06.tex
+INPUT ./step_07.tex
+INPUT ./step_07.tex
+INPUT step_07.tex
+INPUT /usr/share/texlive/texmf-dist/tex/latex/listings/lstlang1.sty
+INPUT /usr/share/texlive/texmf-dist/tex/latex/listings/lstlang1.sty
+INPUT /usr/share/texlive/texmf-dist/tex/latex/listings/lstlang1.sty
+INPUT /usr/share/texlive/texmf-dist/tex/latex/listings/lstmisc.sty
+INPUT /usr/share/texlive/texmf-dist/tex/latex/listings/lstmisc.sty
+INPUT /usr/share/texlive/texmf-dist/tex/latex/listings/lstmisc.sty
 INPUT main.aux
 INPUT ./main.out
 INPUT ./main.out
diff --git a/LateX/main.log b/LateX/main.log
index 5874b57..83112ed 100644
--- a/LateX/main.log
+++ b/LateX/main.log
@@ -1,4 +1,4 @@
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-{/usr/share/texlive/texmf-dist/fonts/enc/dvips/fira/fir_d4q673.enc}])
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 \tf@toc=\write4
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+ [4] (./step_01.tex
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 File: TS1FiraSans-OsF.fd 2019/10/10 (autoinst) Font definitions for TS1/FiraSans-OsF.
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+ [5
 
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+ [7]
 
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+[8]) (./step_02.tex [9]
 Underfull \hbox (badness 10000) in paragraph at lines 63--64
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 LaTeX Warning: `h' float specifier changed to `ht'.
 
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+ [14] [15]
 Overfull \hbox (74.52446pt too wide) in paragraph at lines 125--126
 []\T1/FiraMono-TOsF/regular/n/12 location / \T1/FiraSans-OsF/regular/n/12 (-20) ^^U An-fra-gen an die Haupt-sei-te $\OMS/cmsy/m/n/12 !$ \T1/FiraSans-OsF/regular/n/12 (-20) lie-fert React-Dateien aus \T1/FiraMono-TOsF/regular/n/12 /usr/share/nginx/html 
  []
@@ -725,7 +725,7 @@ Overfull \hbox (36.2292pt too wide) in paragraph at lines 126--127
 []\T1/FiraMono-TOsF/regular/n/12 location /api/ \T1/FiraSans-OsF/regular/n/12 (-20) ^^U An-fra-gen an \T1/FiraMono-TOsF/regular/n/12 /api/* $\OMS/cmsy/m/n/12 !$ \T1/FiraSans-OsF/regular/n/12 (-20) lei-tet sie an das Ba-ckend (\T1/FiraMono-TOsF/regular/n/12 fitness-api:5000\T1/FiraSans-OsF/regular/n/12 (-20) )
  []
 
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+[16] [17]
 LaTeX Font Info:    Font shape `T1/FiraMono-TOsF/m/it' in size <10> not available
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@@ -737,7 +737,7 @@ Overfull \hbox (5.87708pt too wide) in paragraph at lines 220--221
 []\T1/FiraMono-TOsF/regular/n/12 API_BASE =  \T1/FiraSans-OsF/regular/n/12 (-20) ^^U Kei-ne ab-so-lu-te URL! Statt-des-sen re-la-ti-ve Pfa-de wie \T1/FiraMono-TOsF/regular/n/12 /api/workouts\T1/FiraSans-OsF/regular/n/12 (-20) .
  []
 
-[17] [18] [19]
+[18] [19] [20]
 Overfull \hbox (10.69511pt too wide) in paragraph at lines 341--342
 []\T1/FiraMono-TOsF/regular/n/12 -v fitness-data:/app/data \T1/FiraSans-OsF/regular/n/12 (-20) ^^U Bin-det das Vo-lu-me \T1/FiraMono-TOsF/regular/n/12 fitness-data \T1/FiraSans-OsF/regular/n/12 (-20) in den Container-
  []
@@ -747,7 +747,7 @@ Overfull \hbox (0.99844pt too wide) in paragraph at lines 361--362
 []\T1/FiraSans-OsF/regular/n/12 (-20) Ursache: Im Cli-ent stand \T1/FiraMono-TOsF/regular/n/12 const API_BASE = "http://192.168.178.189:5107"\T1/FiraSans-OsF/regular/n/12 (-20) . 
  []
 
-[20]) (./step_04.tex
+[21]) (./step_04.tex
 Underfull \hbox (badness 2197) in paragraph at lines 35--36
 []|\T1/FiraSans-OsF/regular/n/12 (+20) Wie A-Record, aber für IPv6-
  []
@@ -760,22 +760,22 @@ Underfull \hbox (badness 2150) in paragraph at lines 38--39
 
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-[21] [22] [23]
+[22] [23] [24]
 Overfull \hbox (38.17029pt too wide) in paragraph at lines 152--153
 []\T1/FiraMono-TOsF/regular/n/12 *.robre.de \T1/FiraSans-OsF/regular/n/12 (-20) ^^U fängt al-le zu-künf-ti-gen Sub-do-mains ab (z. B. \T1/FiraMono-TOsF/regular/n/12 app.robre.de\T1/FiraSans-OsF/regular/n/12 (-20) , \T1/FiraMono-TOsF/regular/n/12 api.robre.de\T1/FiraSans-OsF/regular/n/12 (-20) ),
  []
 
-[24]) (./step_05.tex
+[25]) (./step_05.tex
 Overfull \hbox (16.09901pt too wide) in paragraph at lines 5--6
 \T1/FiraMono-TOsF/regular/n/12 https://robre.de \T1/FiraSans-OsF/regular/n/12 (-20) er-reich-bar und er-füllt al-le Vor-aus-set-zun-gen für die PWA-Installation. 
  []
 
-[25]
+[26]
 Overfull \hbox (74.09863pt too wide) in paragraph at lines 26--27
 []\T1/FiraSans-OsF/regular/n/12 (-20) Let's En-crypt prüft, ob die-se Da-tei un-ter \T1/FiraMono-TOsF/regular/n/12 http://robre.de/.well-known/acme-challenge/...
  []
 
-[26] [27] [28] [29]
+[27] [28] [29] [30]
 Overfull \hbox (12.23381pt too wide) in paragraph at lines 205--206
 []\T1/FiraMono-TOsF/regular/n/12 certs:/etc/nginx/certs \T1/FiraSans-OsF/regular/n/12 (-20) ^^U Hier spei-chert der acme-companion die SSL-Zertifikate. 
  []
@@ -785,12 +785,12 @@ Overfull \hbox (26.42038pt too wide) in paragraph at lines 224--225
 []\T1/FiraMono-TOsF/regular/n/12 certs, vhost, html, acme \T1/FiraSans-OsF/regular/n/12 (-20) ^^U Spei-chern SSL-Zertifikate, Kon-fi-gu-ra-ti-on und Challenge-
  []
 
-[30] [31]
+[31] [32]
 Overfull \hbox (118.71225pt too wide) in paragraph at lines 288--289
 []\T1/FiraSans-OsF/bold/n/12 (-20) Docker-Container: \T1/FiraSans-OsF/regular/n/12 (-20) Einen neu-en Con-tai-ner mit den Um-ge-bungs-va-ria-blen \T1/FiraMono-TOsF/regular/n/12 VIRTUAL_HOST=todo.robre.de
  []
 
-[32]) (./step_06.tex [33]
+[33]) (./step_06.tex [34]
 Overfull \hbox (44.70439pt too wide) in paragraph at lines 51--52
 []\T1/FiraSans-OsF/bold/n/12 (-20) Datenbank-Fehler: \T1/FiraSans-OsF/regular/n/12 (-20) Die ent-schei-den-de Feh-ler-mel-dung in \T1/FiraMono-TOsF/regular/n/12 /opt/onedev/logs/server.log\T1/FiraSans-OsF/regular/n/12 (-20) : 
  []
@@ -798,12 +798,61 @@ Overfull \hbox (44.70439pt too wide) in paragraph at lines 51--52
 
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-[34] [35] [36]
+[35] [36] [37]
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  [][] 
  []
 
-[37] [38]) [39] (./main.aux)
+[38] [39]) (./step_07.tex
+Overfull \hbox (4.83234pt too wide) in paragraph at lines 27--27
+[]\T1/FiraMono-TOsF/regular/n/12 CONTAINER ID   IMAGE                       PORTS                  NAMES[] 
+ []
+
+
+Overfull \hbox (37.23209pt too wide) in paragraph at lines 27--27
+[]\T1/FiraMono-TOsF/regular/n/12 e8e823a7beea   nginxproxy/nginx-proxy      0.0.0.0:80->80        nginx-proxy[] 
+ []
+
+
+Overfull \hbox (43.71204pt too wide) in paragraph at lines 27--27
+[]\T1/FiraMono-TOsF/regular/n/12 596b718e9c16   fitness-api:latest          5000/tcp               fitness-api[] 
+ []
+
+[40]
+Overfull \hbox (34.20703pt too wide) in paragraph at lines 57--58
+[]\T1/FiraMono-TOsF/regular/n/12 info: Microsoft.Hosting.Lifetime[14] Now listening on: http://[::]:5000
+ []
+
+
+Overfull \hbox (6.27603pt too wide) in paragraph at lines 58--59
+[]\T1/FiraMono-TOsF/regular/n/12 [notice] 19#19: signal 1 (SIGHUP) received, reconfiguring \T1/FiraSans-OsF/regular/n/12 (-20) ^^U nginx wur-
+ []
+
+
+Overfull \hbox (22.20811pt too wide) in paragraph at lines 59--60
+[]\T1/FiraMono-TOsF/regular/n/12 ERROR: failed to build: failed to solve \T1/FiraSans-OsF/regular/n/12 (-20) ^^U Docker-Build-Fehler (häu-fig falsche
+ []
+
+[41] [42]
+Overfull \hbox (30.86067pt too wide) in paragraph at lines 138--139
+[]\T1/FiraSans-OsF/regular/n/12 (-20) Gitea er-kennt den Pu-sh und sucht nach Workflow-Dateien (\T1/FiraMono-TOsF/regular/n/12 .gitea/workflows/*.yaml\T1/FiraSans-OsF/regular/n/12 (-20) ) 
+ []
+
+[43] [44]
+Overfull \hbox (8.06087pt too wide) in paragraph at lines 222--223
+[]\T1/FiraSans-OsF/bold/n/12 (-20) Lösung: \T1/FiraSans-OsF/regular/n/12 (-20) Ko-pi-en der Docker-fi-les (\T1/FiraMono-TOsF/regular/n/12 Dockerfile.api\T1/FiraSans-OsF/regular/n/12 (-20) , \T1/FiraMono-TOsF/regular/n/12 Dockerfile.web\T1/FiraSans-OsF/regular/n/12 (-20) ) im Root-Verzeichnis
+ []
+
+
+Overfull \hbox (17.54306pt too wide) in paragraph at lines 225--226
+[]\T1/FiraSans-OsF/bold/n/12 (-20) Fehlermeldung: \T1/FiraMono-TOsF/regular/n/12 [ERR_PNPM_IGNORED_BUILDS] Ignored build scripts: @swc/core 
+ []
+
+(/usr/share/texlive/texmf-dist/tex/latex/listings/lstlang1.sty
+File: lstlang1.sty 2023/02/27 1.9 listings language file
+) (/usr/share/texlive/texmf-dist/tex/latex/listings/lstmisc.sty
+File: lstmisc.sty 2023/02/27 1.9 (Carsten Heinz)
+) [45] [46]) [47] (./main.aux)
  ***********
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diff --git a/LateX/main.pdf b/LateX/main.pdf
index a982267..d81dbce 100644
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diff --git a/LateX/main.synctex.gz b/LateX/main.synctex.gz
index b875718..49d1c28 100644
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diff --git a/LateX/main.tex b/LateX/main.tex
index e73da4f..fd66874 100644
--- a/LateX/main.tex
+++ b/LateX/main.tex
@@ -249,6 +249,7 @@
 \input{step_04.tex} 
 \input{step_05.tex} 
 \input{step_06.tex} 
+\input{step_07.tex} 
 
 % Weitere Kapitel folgen hier:
 % \input{step_02.tex}
diff --git a/LateX/main.toc b/LateX/main.toc
index 5150865..5fc7622 100644
--- a/LateX/main.toc
+++ b/LateX/main.toc
@@ -1,97 +1,124 @@
 \babel@toc {ngerman}{}\relax 
-\contentsline {section}{\numberline {1}Server-Absicherung (Ubuntu 24.04 auf Contabo VPS)}{4}{section.1}%
-\contentsline {subsection}{\numberline {1.1}Schritt 1: SSH-Verbindung testen}{4}{subsection.1.1}%
-\contentsline {subsection}{\numberline {1.2}Schritt 2: System-Updates}{5}{subsection.1.2}%
-\contentsline {subsection}{\numberline {1.3}Schritt 3: SSH-Key-Authentifizierung}{5}{subsection.1.3}%
-\contentsline {subsection}{\numberline {1.4}Schritt 4: SSH-Client-Konfiguration (Alias)}{6}{subsection.1.4}%
-\contentsline {subsection}{\numberline {1.5}Schritt 5: SSH-Timeout auf 20 Minuten}{7}{subsection.1.5}%
-\contentsline {subsection}{\numberline {1.6}Schritt 6: Fail2Ban (Bruteforce-Schutz)}{7}{subsection.1.6}%
-\contentsline {subsection}{\numberline {1.7}Zusammenfassung}{8}{subsection.1.7}%
-\contentsline {section}{\numberline {2}Firewall mit UFW einrichten}{8}{section.2}%
-\contentsline {subsection}{\numberline {2.1}Was ist eine Firewall und warum brauchen wir sie?}{9}{subsection.2.1}%
-\contentsline {subsection}{\numberline {2.2}Die 65.535 Ports: Ein kurzer Ãœberblick}{9}{subsection.2.2}%
-\contentsline {subsection}{\numberline {2.3}Die drei Ports, die wir öffnen}{9}{subsection.2.3}%
-\contentsline {subsection}{\numberline {2.4}Warum HTTPS für PWAs Pflicht ist}{9}{subsection.2.4}%
-\contentsline {subsection}{\numberline {2.5}Durchführung}{10}{subsection.2.5}%
-\contentsline {subsubsection}{\numberline {2.5.1}Standardrichtlinien setzen}{10}{subsubsection.2.5.1}%
-\contentsline {subsubsection}{\numberline {2.5.2}Benötigte Ports öffnen}{11}{subsubsection.2.5.2}%
-\contentsline {subsubsection}{\numberline {2.5.3}Firewall aktivieren}{11}{subsubsection.2.5.3}%
-\contentsline {subsubsection}{\numberline {2.5.4}Konfiguration überprüfen}{12}{subsubsection.2.5.4}%
-\contentsline {subsection}{\numberline {2.6}Zusammenfassung}{12}{subsection.2.6}%
-\contentsline {section}{\numberline {3}Docker-Images bauen und App deployen}{13}{section.3}%
-\contentsline {subsection}{\numberline {3.1}Was ist Docker und warum nutzen wir es?}{13}{subsection.3.1}%
-\contentsline {subsection}{\numberline {3.2}Die drei Dockerfiles im Detail}{13}{subsection.3.2}%
-\contentsline {subsubsection}{\numberline {3.2.1}Backend-Dockerfile: \texttt {apps/api/Dockerfile}}{13}{subsubsection.3.2.1}%
-\contentsline {subsubsection}{\numberline {3.2.2}Frontend-Dockerfile: \texttt {apps/web/Dockerfile}}{14}{subsubsection.3.2.2}%
-\contentsline {subsubsection}{\numberline {3.2.3}Nginx-Konfiguration: \texttt {apps/web/nginx.conf}}{15}{subsubsection.3.2.3}%
-\contentsline {subsection}{\numberline {3.3}Das Backend: Program.cs im Detail}{16}{subsection.3.3}%
-\contentsline {subsection}{\numberline {3.4}Der API-Client: client.ts im Detail}{17}{subsection.3.4}%
-\contentsline {subsection}{\numberline {3.5}Das Frontend: App.tsx im Detail}{17}{subsection.3.5}%
-\contentsline {subsection}{\numberline {3.6}Images bauen}{18}{subsection.3.6}%
-\contentsline {subsection}{\numberline {3.7}Images exportieren und auf den Server kopieren}{19}{subsection.3.7}%
-\contentsline {subsection}{\numberline {3.8}Container auf dem Server starten}{19}{subsection.3.8}%
-\contentsline {subsection}{\numberline {3.9}Aufgetretene Probleme und Lösungen}{20}{subsection.3.9}%
-\contentsline {subsection}{\numberline {3.10}Zusammenfassung}{21}{subsection.3.10}%
-\contentsline {section}{\numberline {4}Domain kaufen und DNS konfigurieren}{21}{section.4}%
-\contentsline {subsection}{\numberline {4.1}Warum eine eigene Domain?}{21}{subsection.4.1}%
-\contentsline {subsection}{\numberline {4.2}Grundlagen: Wie funktioniert das DNS?}{21}{subsection.4.2}%
-\contentsline {subsection}{\numberline {4.3}Was ist DNS-Propagation?}{22}{subsection.4.3}%
-\contentsline {subsection}{\numberline {4.4}Domain-Kauf bei Contabo}{22}{subsection.4.4}%
-\contentsline {subsubsection}{\numberline {4.4.1}Schritt 1: Einloggen ins Kundencenter}{22}{subsubsection.4.4.1}%
-\contentsline {subsubsection}{\numberline {4.4.2}Schritt 2: Domain bestellen}{22}{subsubsection.4.4.2}%
-\contentsline {subsubsection}{\numberline {4.4.3}Schritt 3: Domain-Handles konfigurieren}{23}{subsubsection.4.4.3}%
-\contentsline {subsubsection}{\numberline {4.4.4}Schritt 4: Nameserver festlegen}{23}{subsubsection.4.4.4}%
-\contentsline {subsubsection}{\numberline {4.4.5}Schritt 5: IP-Adresse auswählen}{23}{subsubsection.4.4.5}%
-\contentsline {subsubsection}{\numberline {4.4.6}Schritt 6: Bestellung abschließen}{23}{subsubsection.4.4.6}%
-\contentsline {subsection}{\numberline {4.5}DNS-Einträge für die Domain einrichten}{23}{subsection.4.5}%
-\contentsline {subsubsection}{\numberline {4.5.1}Schritt 1: DNS Zone Management öffnen}{23}{subsubsection.4.5.1}%
-\contentsline {subsubsection}{\numberline {4.5.2}Schritt 2: Notwendige A-Records anlegen}{24}{subsubsection.4.5.2}%
-\contentsline {subsection}{\numberline {4.6}DNS-Propagation prüfen und beschleunigen}{24}{subsection.4.6}%
-\contentsline {subsubsection}{\numberline {4.6.1}Direkt beim Nameserver prüfen}{24}{subsubsection.4.6.1}%
-\contentsline {subsubsection}{\numberline {4.6.2}Lokalen DNS-Cache leeren}{25}{subsubsection.4.6.2}%
-\contentsline {subsubsection}{\numberline {4.6.3}Server direkt über IP prüfen}{25}{subsubsection.4.6.3}%
-\contentsline {subsubsection}{\numberline {4.6.4}Online DNS-Checker verwenden}{25}{subsubsection.4.6.4}%
-\contentsline {subsection}{\numberline {4.7}Zusammenfassung}{25}{subsection.4.7}%
-\contentsline {section}{\numberline {5}HTTPS mit nginx-proxy und Let's Encrypt}{26}{section.5}%
-\contentsline {subsection}{\numberline {5.1}Warum brauchen wir HTTPS?}{26}{subsection.5.1}%
-\contentsline {subsection}{\numberline {5.2}Wie funktioniert das SSL-Zertifikat von Let's Encrypt?}{26}{subsection.5.2}%
-\contentsline {subsection}{\numberline {5.3}DNS-Propagation: Wie lange dauert es?}{27}{subsection.5.3}%
-\contentsline {subsection}{\numberline {5.4}Architektur: Wie hängen die Container zusammen?}{27}{subsection.5.4}%
-\contentsline {subsection}{\numberline {5.5}Schritt-für-Schritt: HTTPS einrichten}{28}{subsection.5.5}%
-\contentsline {subsubsection}{\numberline {5.5.1}Schritt 1: Bestehende Container stoppen und löschen}{28}{subsubsection.5.5.1}%
-\contentsline {subsubsection}{\numberline {5.5.2}Schritt 2: Verzeichnis für docker-compose anlegen}{28}{subsubsection.5.5.2}%
-\contentsline {subsubsection}{\numberline {5.5.3}Schritt 3: docker-compose.yml erstellen}{28}{subsubsection.5.5.3}%
-\contentsline {paragraph}{\nonumberline nginx-proxy}{30}{paragraph*.3}%
-\contentsline {paragraph}{\nonumberline acme-companion}{30}{paragraph*.5}%
-\contentsline {paragraph}{\nonumberline frontend (entscheidende Umgebungsvariablen!)}{30}{paragraph*.7}%
-\contentsline {paragraph}{\nonumberline Docker Volumes}{31}{paragraph*.9}%
-\contentsline {subsubsection}{\numberline {5.5.4}Schritt 4: Container starten}{31}{subsubsection.5.5.4}%
-\contentsline {subsubsection}{\numberline {5.5.5}Schritt 5: Status prüfen}{31}{subsubsection.5.5.5}%
-\contentsline {subsubsection}{\numberline {5.5.6}Schritt 6: Logs des acme-companion prüfen}{31}{subsubsection.5.5.6}%
-\contentsline {subsection}{\numberline {5.6}Häufige Fehler und ihre Behebung}{31}{subsection.5.6}%
-\contentsline {subsubsection}{\numberline {5.6.1}Fehler 1: ''can't get nginx-proxy container ID''}{31}{subsubsection.5.6.1}%
-\contentsline {subsubsection}{\numberline {5.6.2}Fehler 2: ''contact email has forbidden domain''}{31}{subsubsection.5.6.2}%
-\contentsline {subsubsection}{\numberline {5.6.3}Fehler 3: ''DNS problem: NXDOMAIN''}{32}{subsubsection.5.6.3}%
-\contentsline {subsection}{\numberline {5.7}Wie füge ich später weitere Subdomains hinzu?}{32}{subsection.5.7}%
-\contentsline {subsection}{\numberline {5.8}Wie funktioniert der Reverse Proxy im Detail?}{32}{subsection.5.8}%
-\contentsline {subsection}{\numberline {5.9}Zusammenfassung}{33}{subsection.5.9}%
-\contentsline {section}{\numberline {6}Gitea Installation und Server-Ãœbersicht}{33}{section.6}%
-\contentsline {subsection}{\numberline {6.1}Warum ein eigener Git-Server?}{33}{subsection.6.1}%
-\contentsline {subsection}{\numberline {6.2}OneDev: Der gescheiterte Versuch}{33}{subsection.6.2}%
-\contentsline {subsubsection}{\numberline {6.2.1}Installationsversuch mit Docker (Version \texttt {1dev/server:latest})}{34}{subsubsection.6.2.1}%
-\contentsline {subsection}{\numberline {6.3}Gitea: Die schlanke Alternative}{34}{subsection.6.3}%
-\contentsline {subsection}{\numberline {6.4}Gitea mit Docker installieren}{35}{subsection.6.4}%
-\contentsline {subsubsection}{\numberline {6.4.1}Schritt 1: OneDev rückstandslos entfernen}{35}{subsubsection.6.4.1}%
-\contentsline {subsubsection}{\numberline {6.4.2}Schritt 2: Gitea-Verzeichnis und docker-compose.yml anlegen}{35}{subsubsection.6.4.2}%
-\contentsline {subsubsection}{\numberline {6.4.3}Schritt 3: Container starten}{36}{subsubsection.6.4.3}%
-\contentsline {subsubsection}{\numberline {6.4.4}Schritt 4: Firewall öffnen}{36}{subsubsection.6.4.4}%
-\contentsline {subsubsection}{\numberline {6.4.5}Schritt 5: Gitea im Browser einrichten}{36}{subsubsection.6.4.5}%
-\contentsline {subsection}{\numberline {6.5}Vollständige Server-Übersicht}{37}{subsection.6.5}%
-\contentsline {subsubsection}{\numberline {6.5.1}Laufende Docker-Container}{37}{subsubsection.6.5.1}%
-\contentsline {subsubsection}{\numberline {6.5.2}Docker-Volumes (persistente Datenspeicher)}{37}{subsubsection.6.5.2}%
-\contentsline {subsubsection}{\numberline {6.5.3}Firewall (nur diese Ports sind offen!)}{37}{subsubsection.6.5.3}%
-\contentsline {subsubsection}{\numberline {6.5.4}Installierte Systempakete}{38}{subsubsection.6.5.4}%
-\contentsline {subsubsection}{\numberline {6.5.5}Verzeichnisstruktur unter /opt}{38}{subsubsection.6.5.5}%
-\contentsline {subsection}{\numberline {6.6}Wie Gitea in die Infrastruktur passt}{38}{subsection.6.6}%
-\contentsline {subsection}{\numberline {6.7}Zusammenfassung}{39}{subsection.6.7}%
+\contentsline {section}{\numberline {1}Server-Absicherung (Ubuntu 24.04 auf Contabo VPS)}{5}{section.1}%
+\contentsline {subsection}{\numberline {1.1}Schritt 1: SSH-Verbindung testen}{5}{subsection.1.1}%
+\contentsline {subsection}{\numberline {1.2}Schritt 2: System-Updates}{6}{subsection.1.2}%
+\contentsline {subsection}{\numberline {1.3}Schritt 3: SSH-Key-Authentifizierung}{6}{subsection.1.3}%
+\contentsline {subsection}{\numberline {1.4}Schritt 4: SSH-Client-Konfiguration (Alias)}{7}{subsection.1.4}%
+\contentsline {subsection}{\numberline {1.5}Schritt 5: SSH-Timeout auf 20 Minuten}{8}{subsection.1.5}%
+\contentsline {subsection}{\numberline {1.6}Schritt 6: Fail2Ban (Bruteforce-Schutz)}{8}{subsection.1.6}%
+\contentsline {subsection}{\numberline {1.7}Zusammenfassung}{9}{subsection.1.7}%
+\contentsline {section}{\numberline {2}Firewall mit UFW einrichten}{9}{section.2}%
+\contentsline {subsection}{\numberline {2.1}Was ist eine Firewall und warum brauchen wir sie?}{10}{subsection.2.1}%
+\contentsline {subsection}{\numberline {2.2}Die 65.535 Ports: Ein kurzer Ãœberblick}{10}{subsection.2.2}%
+\contentsline {subsection}{\numberline {2.3}Die drei Ports, die wir öffnen}{10}{subsection.2.3}%
+\contentsline {subsection}{\numberline {2.4}Warum HTTPS für PWAs Pflicht ist}{10}{subsection.2.4}%
+\contentsline {subsection}{\numberline {2.5}Durchführung}{11}{subsection.2.5}%
+\contentsline {subsubsection}{\numberline {2.5.1}Standardrichtlinien setzen}{11}{subsubsection.2.5.1}%
+\contentsline {subsubsection}{\numberline {2.5.2}Benötigte Ports öffnen}{12}{subsubsection.2.5.2}%
+\contentsline {subsubsection}{\numberline {2.5.3}Firewall aktivieren}{12}{subsubsection.2.5.3}%
+\contentsline {subsubsection}{\numberline {2.5.4}Konfiguration überprüfen}{13}{subsubsection.2.5.4}%
+\contentsline {subsection}{\numberline {2.6}Zusammenfassung}{13}{subsection.2.6}%
+\contentsline {section}{\numberline {3}Docker-Images bauen und App deployen}{14}{section.3}%
+\contentsline {subsection}{\numberline {3.1}Was ist Docker und warum nutzen wir es?}{14}{subsection.3.1}%
+\contentsline {subsection}{\numberline {3.2}Die drei Dockerfiles im Detail}{14}{subsection.3.2}%
+\contentsline {subsubsection}{\numberline {3.2.1}Backend-Dockerfile: \texttt {apps/api/Dockerfile}}{14}{subsubsection.3.2.1}%
+\contentsline {subsubsection}{\numberline {3.2.2}Frontend-Dockerfile: \texttt {apps/web/Dockerfile}}{15}{subsubsection.3.2.2}%
+\contentsline {subsubsection}{\numberline {3.2.3}Nginx-Konfiguration: \texttt {apps/web/nginx.conf}}{16}{subsubsection.3.2.3}%
+\contentsline {subsection}{\numberline {3.3}Das Backend: Program.cs im Detail}{17}{subsection.3.3}%
+\contentsline {subsection}{\numberline {3.4}Der API-Client: client.ts im Detail}{18}{subsection.3.4}%
+\contentsline {subsection}{\numberline {3.5}Das Frontend: App.tsx im Detail}{18}{subsection.3.5}%
+\contentsline {subsection}{\numberline {3.6}Images bauen}{19}{subsection.3.6}%
+\contentsline {subsection}{\numberline {3.7}Images exportieren und auf den Server kopieren}{20}{subsection.3.7}%
+\contentsline {subsection}{\numberline {3.8}Container auf dem Server starten}{20}{subsection.3.8}%
+\contentsline {subsection}{\numberline {3.9}Aufgetretene Probleme und Lösungen}{21}{subsection.3.9}%
+\contentsline {subsection}{\numberline {3.10}Zusammenfassung}{22}{subsection.3.10}%
+\contentsline {section}{\numberline {4}Domain kaufen und DNS konfigurieren}{22}{section.4}%
+\contentsline {subsection}{\numberline {4.1}Warum eine eigene Domain?}{22}{subsection.4.1}%
+\contentsline {subsection}{\numberline {4.2}Grundlagen: Wie funktioniert das DNS?}{22}{subsection.4.2}%
+\contentsline {subsection}{\numberline {4.3}Was ist DNS-Propagation?}{23}{subsection.4.3}%
+\contentsline {subsection}{\numberline {4.4}Domain-Kauf bei Contabo}{23}{subsection.4.4}%
+\contentsline {subsubsection}{\numberline {4.4.1}Schritt 1: Einloggen ins Kundencenter}{23}{subsubsection.4.4.1}%
+\contentsline {subsubsection}{\numberline {4.4.2}Schritt 2: Domain bestellen}{23}{subsubsection.4.4.2}%
+\contentsline {subsubsection}{\numberline {4.4.3}Schritt 3: Domain-Handles konfigurieren}{24}{subsubsection.4.4.3}%
+\contentsline {subsubsection}{\numberline {4.4.4}Schritt 4: Nameserver festlegen}{24}{subsubsection.4.4.4}%
+\contentsline {subsubsection}{\numberline {4.4.5}Schritt 5: IP-Adresse auswählen}{24}{subsubsection.4.4.5}%
+\contentsline {subsubsection}{\numberline {4.4.6}Schritt 6: Bestellung abschließen}{24}{subsubsection.4.4.6}%
+\contentsline {subsection}{\numberline {4.5}DNS-Einträge für die Domain einrichten}{24}{subsection.4.5}%
+\contentsline {subsubsection}{\numberline {4.5.1}Schritt 1: DNS Zone Management öffnen}{24}{subsubsection.4.5.1}%
+\contentsline {subsubsection}{\numberline {4.5.2}Schritt 2: Notwendige A-Records anlegen}{25}{subsubsection.4.5.2}%
+\contentsline {subsection}{\numberline {4.6}DNS-Propagation prüfen und beschleunigen}{25}{subsection.4.6}%
+\contentsline {subsubsection}{\numberline {4.6.1}Direkt beim Nameserver prüfen}{25}{subsubsection.4.6.1}%
+\contentsline {subsubsection}{\numberline {4.6.2}Lokalen DNS-Cache leeren}{26}{subsubsection.4.6.2}%
+\contentsline {subsubsection}{\numberline {4.6.3}Server direkt über IP prüfen}{26}{subsubsection.4.6.3}%
+\contentsline {subsubsection}{\numberline {4.6.4}Online DNS-Checker verwenden}{26}{subsubsection.4.6.4}%
+\contentsline {subsection}{\numberline {4.7}Zusammenfassung}{26}{subsection.4.7}%
+\contentsline {section}{\numberline {5}HTTPS mit nginx-proxy und Let's Encrypt}{27}{section.5}%
+\contentsline {subsection}{\numberline {5.1}Warum brauchen wir HTTPS?}{27}{subsection.5.1}%
+\contentsline {subsection}{\numberline {5.2}Wie funktioniert das SSL-Zertifikat von Let's Encrypt?}{27}{subsection.5.2}%
+\contentsline {subsection}{\numberline {5.3}DNS-Propagation: Wie lange dauert es?}{28}{subsection.5.3}%
+\contentsline {subsection}{\numberline {5.4}Architektur: Wie hängen die Container zusammen?}{28}{subsection.5.4}%
+\contentsline {subsection}{\numberline {5.5}Schritt-für-Schritt: HTTPS einrichten}{29}{subsection.5.5}%
+\contentsline {subsubsection}{\numberline {5.5.1}Schritt 1: Bestehende Container stoppen und löschen}{29}{subsubsection.5.5.1}%
+\contentsline {subsubsection}{\numberline {5.5.2}Schritt 2: Verzeichnis für docker-compose anlegen}{29}{subsubsection.5.5.2}%
+\contentsline {subsubsection}{\numberline {5.5.3}Schritt 3: docker-compose.yml erstellen}{29}{subsubsection.5.5.3}%
+\contentsline {paragraph}{\nonumberline nginx-proxy}{31}{paragraph*.3}%
+\contentsline {paragraph}{\nonumberline acme-companion}{31}{paragraph*.5}%
+\contentsline {paragraph}{\nonumberline frontend (entscheidende Umgebungsvariablen!)}{31}{paragraph*.7}%
+\contentsline {paragraph}{\nonumberline Docker Volumes}{32}{paragraph*.9}%
+\contentsline {subsubsection}{\numberline {5.5.4}Schritt 4: Container starten}{32}{subsubsection.5.5.4}%
+\contentsline {subsubsection}{\numberline {5.5.5}Schritt 5: Status prüfen}{32}{subsubsection.5.5.5}%
+\contentsline {subsubsection}{\numberline {5.5.6}Schritt 6: Logs des acme-companion prüfen}{32}{subsubsection.5.5.6}%
+\contentsline {subsection}{\numberline {5.6}Häufige Fehler und ihre Behebung}{32}{subsection.5.6}%
+\contentsline {subsubsection}{\numberline {5.6.1}Fehler 1: ''can't get nginx-proxy container ID''}{32}{subsubsection.5.6.1}%
+\contentsline {subsubsection}{\numberline {5.6.2}Fehler 2: ''contact email has forbidden domain''}{32}{subsubsection.5.6.2}%
+\contentsline {subsubsection}{\numberline {5.6.3}Fehler 3: ''DNS problem: NXDOMAIN''}{33}{subsubsection.5.6.3}%
+\contentsline {subsection}{\numberline {5.7}Wie füge ich später weitere Subdomains hinzu?}{33}{subsection.5.7}%
+\contentsline {subsection}{\numberline {5.8}Wie funktioniert der Reverse Proxy im Detail?}{33}{subsection.5.8}%
+\contentsline {subsection}{\numberline {5.9}Zusammenfassung}{34}{subsection.5.9}%
+\contentsline {section}{\numberline {6}Gitea Installation und Server-Ãœbersicht}{34}{section.6}%
+\contentsline {subsection}{\numberline {6.1}Warum ein eigener Git-Server?}{34}{subsection.6.1}%
+\contentsline {subsection}{\numberline {6.2}OneDev: Der gescheiterte Versuch}{34}{subsection.6.2}%
+\contentsline {subsubsection}{\numberline {6.2.1}Installationsversuch mit Docker (Version \texttt {1dev/server:latest})}{35}{subsubsection.6.2.1}%
+\contentsline {subsection}{\numberline {6.3}Gitea: Die schlanke Alternative}{35}{subsection.6.3}%
+\contentsline {subsection}{\numberline {6.4}Gitea mit Docker installieren}{36}{subsection.6.4}%
+\contentsline {subsubsection}{\numberline {6.4.1}Schritt 1: OneDev rückstandslos entfernen}{36}{subsubsection.6.4.1}%
+\contentsline {subsubsection}{\numberline {6.4.2}Schritt 2: Gitea-Verzeichnis und docker-compose.yml anlegen}{36}{subsubsection.6.4.2}%
+\contentsline {subsubsection}{\numberline {6.4.3}Schritt 3: Container starten}{37}{subsubsection.6.4.3}%
+\contentsline {subsubsection}{\numberline {6.4.4}Schritt 4: Firewall öffnen}{37}{subsubsection.6.4.4}%
+\contentsline {subsubsection}{\numberline {6.4.5}Schritt 5: Gitea im Browser einrichten}{37}{subsubsection.6.4.5}%
+\contentsline {subsection}{\numberline {6.5}Vollständige Server-Übersicht}{38}{subsection.6.5}%
+\contentsline {subsubsection}{\numberline {6.5.1}Laufende Docker-Container}{38}{subsubsection.6.5.1}%
+\contentsline {subsubsection}{\numberline {6.5.2}Docker-Volumes (persistente Datenspeicher)}{38}{subsubsection.6.5.2}%
+\contentsline {subsubsection}{\numberline {6.5.3}Firewall (nur diese Ports sind offen!)}{38}{subsubsection.6.5.3}%
+\contentsline {subsubsection}{\numberline {6.5.4}Installierte Systempakete}{39}{subsubsection.6.5.4}%
+\contentsline {subsubsection}{\numberline {6.5.5}Verzeichnisstruktur unter /opt}{39}{subsubsection.6.5.5}%
+\contentsline {subsection}{\numberline {6.6}Wie Gitea in die Infrastruktur passt}{39}{subsection.6.6}%
+\contentsline {subsection}{\numberline {6.7}Zusammenfassung}{40}{subsection.6.7}%
+\contentsline {section}{\numberline {7}CI/CD mit Gitea Actions}{40}{section.7}%
+\contentsline {subsection}{\numberline {7.1}Docker-Grundlagen: Container verstehen und verwalten}{40}{subsection.7.1}%
+\contentsline {subsubsection}{\numberline {7.1.1}Container auflisten}{40}{subsubsection.7.1.1}%
+\contentsline {subsubsection}{\numberline {7.1.2}Container-Logs anzeigen}{41}{subsubsection.7.1.2}%
+\contentsline {subsubsection}{\numberline {7.1.3}Container stoppen, starten, neustarten}{42}{subsubsection.7.1.3}%
+\contentsline {subsubsection}{\numberline {7.1.4}In einen Container einsteigen}{42}{subsubsection.7.1.4}%
+\contentsline {subsubsection}{\numberline {7.1.5}Images verwalten}{42}{subsubsection.7.1.5}%
+\contentsline {subsubsection}{\numberline {7.1.6}Netzwerke inspizieren}{43}{subsubsection.7.1.6}%
+\contentsline {subsection}{\numberline {7.2}CI/CD-Pipeline mit Gitea Actions einrichten}{43}{subsection.7.2}%
+\contentsline {subsubsection}{\numberline {7.2.1}Was ist CI/CD?}{43}{subsubsection.7.2.1}%
+\contentsline {subsubsection}{\numberline {7.2.2}Der Gitea Act Runner}{43}{subsubsection.7.2.2}%
+\contentsline {subsubsection}{\numberline {7.2.3}Die Workflow-Datei}{44}{subsubsection.7.2.3}%
+\contentsline {subsection}{\numberline {7.3}Alle aufgetretenen Probleme und ihre Lösungen}{44}{subsection.7.3}%
+\contentsline {subsubsection}{\numberline {7.3.1}Problem 1: Docker-Socket doppelt gemountet}{44}{subsubsection.7.3.1}%
+\contentsline {subsubsection}{\numberline {7.3.2}Problem 2: Pfade zu Dockerfiles}{45}{subsubsection.7.3.2}%
+\contentsline {subsubsection}{\numberline {7.3.3}Problem 3: ERR\_PNPM\_IGNORED\_BUILDS}{45}{subsubsection.7.3.3}%
+\contentsline {subsubsection}{\numberline {7.3.4}Problem 4: Fehlende nginx.conf}{45}{subsubsection.7.3.4}%
+\contentsline {subsubsection}{\numberline {7.3.5}Problem 5: Container ohne Port-Mapping}{45}{subsubsection.7.3.5}%
+\contentsline {subsection}{\numberline {7.4}Tutorial: Einfache HTML-Seite deployen}{45}{subsection.7.4}%
+\contentsline {subsubsection}{\numberline {7.4.1}Schritt 1: Projekt erstellen}{45}{subsubsection.7.4.1}%
+\contentsline {subsubsection}{\numberline {7.4.2}Schritt 2: index.html erstellen}{46}{subsubsection.7.4.2}%
+\contentsline {subsubsection}{\numberline {7.4.3}Schritt 3: Dockerfile erstellen}{46}{subsubsection.7.4.3}%
+\contentsline {subsubsection}{\numberline {7.4.4}Schritt 4: Workflow erstellen}{46}{subsubsection.7.4.4}%
+\contentsline {subsubsection}{\numberline {7.4.5}Schritt 5: In Gitea pushen}{47}{subsubsection.7.4.5}%
+\contentsline {subsubsection}{\numberline {7.4.6}Schritt 6: Firewall öffnen und testen}{47}{subsubsection.7.4.6}%
+\contentsline {subsection}{\numberline {7.5}Docker-Befehle Cheat Sheet}{47}{subsection.7.5}%
+\contentsline {subsection}{\numberline {7.6}Zusammenfassung}{47}{subsection.7.6}%
 \providecommand \tocbasic@end@toc@file {}\tocbasic@end@toc@file 
diff --git a/LateX/step_07.tex b/LateX/step_07.tex
new file mode 100644
index 0000000..aa1d236
--- /dev/null
+++ b/LateX/step_07.tex
@@ -0,0 +1,369 @@
+% ============================================
+% STEP 07: CI/CD MIT GITEA ACTIONS - DAS VOLLSTÄNDIGE TUTORIAL
+% ============================================
+
+\section{CI/CD mit Gitea Actions}
+\label{sec:step07}
+
+In diesem Schritt haben wir eine vollständige CI/CD-Pipeline mit Gitea Actions eingerichtet. Bei jedem \texttt{git push} auf den \texttt{master}-Branch wird unsere Anwendung automatisch gebaut und auf dem Server deployed. Dieses Kapitel dokumentiert den kompletten Prozess, alle aufgetretenen Probleme und deren Lösungen, sowie ein ausführliches Docker-Tutorial für die tägliche Arbeit.
+
+\subsection{Docker-Grundlagen: Container verstehen und verwalten}
+
+Bevor wir in die CI/CD-Pipeline einsteigen, ist es wichtig, die Docker-Befehle zu verstehen, mit denen wir täglich arbeiten.
+
+\subsubsection{Container auflisten}
+
+\begin{lstlisting}[language=Bash, caption={Alle laufenden Container anzeigen}]
+docker ps
+\end{lstlisting}
+
+\textbf{Ausgabe verstehen:}
+
+\begin{verbatim}
+CONTAINER ID   IMAGE                       PORTS                  NAMES
+98f3eff6a77f   gitea/gitea:latest          0.0.0.0:3000->3000    gitea
+e8e823a7beea   nginxproxy/nginx-proxy      0.0.0.0:80->80        nginx-proxy
+596b718e9c16   fitness-api:latest          5000/tcp               fitness-api
+\end{verbatim}
+
+\textbf{Spalten erklärt:}
+\begin{itemize}
+    \item \texttt{CONTAINER ID} – Eindeutige 12-stellige Hexadezimal-ID des Containers. Kann abgekürzt verwendet werden (z.B. \texttt{98f3}).
+    \item \texttt{IMAGE} – Das Image, aus dem der Container gestartet wurde. \texttt{latest} ist der Tag (Version).
+    \item \texttt{PORTS} – Port-Weiterleitungen. \texttt{0.0.0.0:3000->3000} bedeutet: Port 3000 des Hosts ist auf Port 3000 des Containers weitergeleitet. Steht nur \texttt{5000/tcp}, ist der Port nur container-intern erreichbar.
+    \item \texttt{NAMES} – Der Name, den wir dem Container gegeben haben. Wird für \texttt{docker exec} und \texttt{docker logs} verwendet.
+\end{itemize}
+
+\textbf{Alle Container (auch gestoppte):}
+\begin{lstlisting}[language=Bash, caption={Auch gestoppte Container anzeigen}]
+docker ps -a
+\end{lstlisting}
+
+\subsubsection{Container-Logs anzeigen}
+
+\begin{lstlisting}[language=Bash, caption={Logs eines Containers anzeigen}]
+# Letzte 50 Zeilen
+docker logs fitness-api --tail 50
+
+# Logs live verfolgen (Strg+C zum Beenden)
+docker logs -f nginx-proxy
+
+# Logs seit 10 Minuten
+docker logs fitness-web --since 10m
+\end{lstlisting}
+
+\textbf{Typische Log-Einträge verstehen:}
+\begin{itemize}
+    \item \texttt{info: Microsoft.Hosting.Lifetime[14] Now listening on: http://[::]:5000} – Backend läuft und wartet auf Anfragen
+    \item \texttt{[notice] 19\#19: signal 1 (SIGHUP) received, reconfiguring} – nginx wurde neu geladen (nach Konfigurationsänderung)
+    \item \texttt{ERROR: failed to build: failed to solve} – Docker-Build-Fehler (häufig falsche Pfade)
+\end{itemize}
+
+\subsubsection{Container stoppen, starten, neustarten}
+
+\begin{lstlisting}[language=Bash, caption={Container-Lebenszyklus}]
+# Container stoppen (bleibt existent, kann neugestartet werden)
+docker stop fitness-web
+
+# Gestoppten Container wieder starten
+docker start fitness-web
+
+# Container neustarten (stop + start)
+docker restart nginx-proxy
+
+# Container stoppen UND löschen (Wegwerfen!)
+docker rm fitness-web
+
+# Erzwingen: stoppen + löschen in einem Befehl
+docker rm -f fitness-web
+\end{lstlisting}
+
+\subsubsection{In einen Container einsteigen}
+
+\begin{lstlisting}[language=Bash, caption={Shell im Container öffnen}]
+# In einen laufenden Container einsteigen und Bash öffnen
+docker exec -it fitness-api bash
+
+# Einzelnen Befehl im Container ausführen
+docker exec nginx-proxy nginx -s reload
+
+# Mit sh (falls bash nicht verfügbar)
+docker exec -it fitness-web sh
+\end{lstlisting}
+
+\textbf{Erklärung:}
+\begin{itemize}
+    \item \texttt{exec} – Führt einen Befehl in einem laufenden Container aus
+    \item \texttt{-it} – Interaktiv + Terminal (damit du tippen kannst)
+    \item \texttt{bash / sh} – Die zu öffnende Shell
+\end{itemize}
+
+\subsubsection{Images verwalten}
+
+\begin{lstlisting}[language=Bash, caption={Images anzeigen und löschen}]
+# Alle lokal gespeicherten Images anzeigen
+docker images
+
+# Nicht mehr verwendete Images löschen
+docker image prune -a
+
+# Ein bestimmtes Image löschen
+docker rmi fitness-api:latest
+\end{lstlisting}
+
+\subsubsection{Netzwerke inspizieren}
+
+\begin{lstlisting}[language=Bash, caption={Netzwerke untersuchen}]
+# Alle Docker-Netzwerke
+docker network ls
+
+# Details eines Netzwerks (welche Container sind drin?)
+docker network inspect fitness_proxy-net
+
+# Nur die Container-Namen im Netzwerk anzeigen
+docker network inspect fitness_proxy-net --format='{{range .Containers}}{{.Name}} {{end}}'
+\end{lstlisting}
+
+\subsection{CI/CD-Pipeline mit Gitea Actions einrichten}
+
+\subsubsection{Was ist CI/CD?}
+
+\textbf{CI (Continuous Integration):} Bei jedem Push wird der Code automatisch gebaut und getestet. Fehler werden sofort erkannt.
+
+\textbf{CD (Continuous Deployment):} Nach erfolgreichem Build wird die Anwendung automatisch auf dem Server deployed.
+
+\textbf{Unser Workflow:}
+\begin{enumerate}
+    \item Developer macht \texttt{git push} auf den \texttt{master}-Branch
+    \item Gitea erkennt den Push und sucht nach Workflow-Dateien (\texttt{.gitea/workflows/*.yaml})
+    \item Gitea weist den Job dem \texttt{gitea\_runner} zu
+    \item Der Runner checkt den Code aus, baut Docker-Images und startet die Container neu
+\end{enumerate}
+
+\subsubsection{Der Gitea Act Runner}
+
+Der Runner ist der "Arbeiter", der die CI/CD-Jobs ausführt. Er läuft als Docker-Container und hat Zugriff auf den Docker-Socket des Hosts, um selbst Container zu bauen.
+
+\begin{lstlisting}[language=Bash, caption={Runner starten und mit Gitea verbinden}]
+docker run -d --name gitea_runner \
+  -e GITEA_INSTANCE_URL=http://185.209.229.167:3000 \
+  -e GITEA_RUNNER_REGISTRATION_TOKEN=DEIN_TOKEN \
+  -v /var/run/docker.sock:/var/run/docker.sock \
+  gitea/act_runner:nightly
+\end{lstlisting}
+
+\textbf{Wichtige Details:}
+\begin{itemize}
+    \item \texttt{-v /var/run/docker.sock:/var/run/docker.sock} – Gibt dem Runner Zugriff auf Docker. \textbf{Ohne diese Zeile kann der Runner keine Images bauen!}
+    \item Der Token ist ein Einmal-Passwort. Nach erfolgreicher Registrierung ist er verbraucht. Der Container stoppt dann mit Exit-Code 0 – das ist normal! Einfach \texttt{docker start gitea\_runner} ausführen.
+\end{itemize}
+
+\subsubsection{Die Workflow-Datei}
+
+Die Datei \texttt{.gitea/workflows/deploy.yaml} definiert den Ablauf:
+
+\begin{lstlisting}[language=YAML, caption={Vollständige deploy.yaml (finale Version)}]
+name: Deploy Fitness App
+on:
+  push:
+    branches: [ "master" ]
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    container:
+      image: catthehacker/ubuntu:act-latest
+      volumes:
+        - /opt/fitness:/opt/fitness
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Build & Deploy
+        run: |
+          docker build -f Dockerfile.api -t fitness-api:latest .
+          docker build -f Dockerfile.web -t fitness-web:latest .
+          docker stop fitness-api fitness-web 2>/dev/null || true
+          docker rm fitness-api fitness-web 2>/dev/null || true
+          docker run -d --name fitness-api --network fitness_proxy-net \
+            -v fitness_fitness-data:/app/data fitness-api:latest
+          docker run -d --name fitness-web --network fitness_proxy-net \
+            -p 80:80 \
+            -e VIRTUAL_HOST=robre.de,www.robre.de \
+            -e LETSENCRYPT_HOST=robre.de,www.robre.de \
+            -e VIRTUAL_PORT=80 \
+            fitness-web:latest
+\end{lstlisting}
+
+\textbf{Zeile für Zeile erklärt:}
+\begin{itemize}
+    \item \texttt{on: push: branches: [ "master" ]} – Der Workflow startet nur bei Pushes auf den master-Branch.
+    \item \texttt{runs-on: ubuntu-latest} – Die virtuelle Maschine, auf der der Job läuft.
+    \item \texttt{container: image: catthehacker/ubuntu:act-latest} – Ein Docker-Image mit Ubuntu + Docker CLI.
+    \item \texttt{volumes: /opt/fitness:/opt/fitness} – Bindet das Projektverzeichnis ein.
+    \item \texttt{2>/dev/null || true} – Unterdrückt Fehlermeldungen, wenn die Container nicht existieren.
+\end{itemize}
+
+\subsection{Alle aufgetretenen Probleme und ihre Lösungen}
+
+\subsubsection{Problem 1: Docker-Socket doppelt gemountet}
+\textbf{Fehlermeldung:} \texttt{Duplicate mount point: /var/run/docker.sock}
+
+\textbf{Ursache:} Der Gitea-Runner mountet den Docker-Socket automatisch. Wir hatten ihn zusätzlich im Workflow definiert.
+
+\textbf{Lösung:} Die Zeile \texttt{- /var/run/docker.sock:/var/run/docker.sock} aus dem Workflow entfernen.
+
+\subsubsection{Problem 2: Pfade zu Dockerfiles}
+\textbf{Fehlermeldung:} \texttt{open Dockerfile: no such file or directory}
+
+\textbf{Ursache:} Die Dockerfiles lagen in \texttt{apps/api/} und \texttt{apps/web/}, aber der Build-Kontext war das Repository-Root. Relative Pfade funktionierten nicht.
+
+\textbf{Lösung:} Kopien der Dockerfiles (\texttt{Dockerfile.api}, \texttt{Dockerfile.web}) im Root-Verzeichnis angelegt.
+
+\subsubsection{Problem 3: ERR\_PNPM\_IGNORED\_BUILDS}
+\textbf{Fehlermeldung:} \texttt{[ERR\_PNPM\_IGNORED\_BUILDS] Ignored build scripts: @swc/core}
+
+\textbf{Ursache:} pnpm verweigert standardmäßig Build-Scripts für Sicherheitsüberprüfung.
+
+\textbf{Lösung:} \texttt{@vitejs/plugin-react-swc} durch \texttt{@vitejs/plugin-react} ersetzt. Keine Build-Scripts mehr nötig.
+
+\subsubsection{Problem 4: Fehlende nginx.conf}
+\textbf{Fehlermeldung:} \texttt{"/apps/web/nginx.conf": not found}
+
+\textbf{Ursache:} Die \texttt{nginx.conf} war nicht im Docker-Build-Kontext.
+
+\textbf{Lösung:} \texttt{nginx.conf} ins Root kopiert und \texttt{Dockerfile.web} entsprechend angepasst.
+
+\subsubsection{Problem 5: Container ohne Port-Mapping}
+\textbf{Symptom:} \texttt{docker ps} zeigt \texttt{80/tcp} ohne \texttt{0.0.0.0:80->80/tcp}.
+
+\textbf{Ursache:} Die CI/CD-Pipeline startete Container ohne \texttt{-p 80:80}.
+
+\textbf{Lösung:} In der Workflow-Datei explizit \texttt{-p 80:80} zum \texttt{docker run}-Befehl hinzugefügt.
+
+\subsection{Tutorial: Einfache HTML-Seite deployen}
+
+Um den kompletten Prozess von A bis Z zu verstehen, deployen wir eine minimale HTML-Seite.
+
+\subsubsection{Schritt 1: Projekt erstellen}
+
+\begin{lstlisting}[language=Bash, caption={Neues Projekt lokal anlegen}]
+cd ~/projects
+mkdir hello-ci
+cd hello-ci
+git init
+\end{lstlisting}
+
+\subsubsection{Schritt 2: index.html erstellen}
+
+\begin{lstlisting}[language=HTML, caption={Minimale HTML-Seite}]
+<!DOCTYPE html>
+<html lang="de">
+<head>
+    <meta charset="UTF-8">
+    <title>Hello CI/CD</title>
+    <style>
+        body { font-family: sans-serif; text-align: center; padding: 50px; }
+        h1 { color: #059669; }
+    </style>
+</head>
+<body>
+    <h1>Hello CI/CD!</h1>
+    <p>Diese Seite wurde automatisch deployed.</p>
+</body>
+</html>
+\end{lstlisting}
+
+\subsubsection{Schritt 3: Dockerfile erstellen}
+
+\begin{lstlisting}[language=Dockerfile, caption={Dockerfile für statische HTML-Seite}]
+FROM nginx:stable-alpine
+COPY index.html /usr/share/nginx/html/index.html
+EXPOSE 80
+CMD ["nginx", "-g", "daemon off;"]
+\end{lstlisting}
+
+\subsubsection{Schritt 4: Workflow erstellen}
+
+\begin{lstlisting}[language=Bash, caption={Verzeichnis anlegen}]
+mkdir -p .gitea/workflows
+\end{lstlisting}
+
+\begin{lstlisting}[language=YAML, caption={.gitea/workflows/deploy.yaml}]
+name: Deploy Hello Page
+on:
+  push:
+    branches: [ "master" ]
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    container:
+      image: catthehacker/ubuntu:act-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Build and Deploy
+        run: |
+          docker build -t hello-ci:latest .
+          docker stop hello-ci 2>/dev/null || true
+          docker rm hello-ci 2>/dev/null || true
+          docker run -d --name hello-ci -p 8080:80 hello-ci:latest
+\end{lstlisting}
+
+\subsubsection{Schritt 5: In Gitea pushen}
+
+\begin{lstlisting}[language=Bash, caption={Push zu Gitea}]
+# In Gitea ein neues Repository "hello-ci" anlegen, dann:
+git remote add gitea http://185.209.229.167:3000/robre/hello-ci.git
+git add .
+git commit -m "Initial commit"
+git push gitea master
+\end{lstlisting}
+
+\subsubsection{Schritt 6: Firewall öffnen und testen}
+
+\begin{lstlisting}[language=Bash, caption={Port 8080 freigeben}]
+ssh testserver "ufw allow 8080/tcp"
+\end{lstlisting}
+
+Im Browser: \texttt{http://185.209.229.167:8080}
+
+\subsection{Docker-Befehle Cheat Sheet}
+
+\begin{table}[h]
+\centering
+\caption{Häufig verwendete Docker-Befehle}
+\begin{tabular}{@{}lp{8cm}@{}}
+\toprule
+\textbf{Befehl} & \textbf{Beschreibung} \\
+\midrule
+\texttt{docker ps} & Laufende Container anzeigen \\
+\texttt{docker ps -a} & Alle Container (auch gestoppte) \\
+\texttt{docker logs NAME} & Logs eines Containers anzeigen \\
+\texttt{docker logs -f NAME} & Logs live verfolgen \\
+\texttt{docker stop NAME} & Container stoppen \\
+\texttt{docker start NAME} & Container starten \\
+\texttt{docker restart NAME} & Container neustarten \\
+\texttt{docker rm NAME} & Container löschen \\
+\texttt{docker rm -f NAME} & Container erzwingen löschen \\
+\texttt{docker exec -it NAME bash} & Shell im Container öffnen \\
+\texttt{docker images} & Alle Images anzeigen \\
+\texttt{docker network ls} & Netzwerke anzeigen \\
+\texttt{docker network inspect NETZ} & Netzwerk-Details \\
+\texttt{docker system prune -a} & Ungenutzte Daten löschen \\
+\bottomrule
+\end{tabular}
+\end{table}
+
+\subsection{Zusammenfassung}
+
+Nach diesem Schritt haben wir:
+\begin{itemize}
+    \item Eine vollständige CI/CD-Pipeline mit Gitea Actions
+    \item Automatisches Build und Deployment bei jedem Push auf master
+    \item Verständnis aller Docker-Befehle für die tägliche Arbeit
+    \item Ein komplettes Tutorial zum Nachvollziehen des Prozesses
+    \item Alle Fehler dokumentiert mit Ursachen und Lösungen
+\end{itemize}
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