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Author: Ghassan Yusuf <ghassan.yousif.83@gmail.com>
Date:   Sun Sep 21 22:54:10 2025 +0300

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+# Deploying .NET Web API with PostgreSQL on Debian 12 LXC
+
+## Overview
+This document outlines the steps taken to deploy a .NET Web API on a Debian 12 (Bookworm) LXC container running on Proxmox, and connect it to a PostgreSQL database accessible by the API.
+
+---
+
+## Prerequisites
+
+- Debian 12 (Bookworm) LXC container on Proxmox
+- Root or sudo access on the container
+- Published .NET Web API DLL ready for deployment
+- PostgreSQL installed on the container
+
+---
+
+## Step 1: Install .NET 8 Runtime and SDK
+
+```
+sudo apt update && sudo apt upgrade -y
+sudo apt install -y apt-transport-https ca-certificates gnupg wget
+wget https://packages.microsoft.com/config/debian/12/packages-microsoft-prod.deb -O packages-microsoft-prod.deb
+sudo dpkg -i packages-microsoft-prod.deb
+sudo apt update
+sudo apt install -y dotnet-sdk-8.0 aspnetcore-runtime-8.0
+dotnet --list-sdks
+dotnet --list-runtimes
+```
+
+---
+
+## Step 2: Install PostgreSQL
+
+```
+sudo apt install -y postgresql postgresql-contrib
+sudo systemctl enable postgresql
+sudo systemctl start postgresql
+```
+
+---
+
+## Step 3: Create PostgreSQL User and Database
+
+Log into psql as postgres user:
+
+```
+sudo -u postgres psql
+```
+
+Inside psql shell:
+
+```
+CREATE USER api WITH PASSWORD 'abcd1234';
+CREATE DATABASE apidatabase OWNER api;
+GRANT ALL PRIVILEGES ON DATABASE apidatabase TO api;
+\q
+```
+
+---
+
+## Step 4: Deploy the .NET Web API DLL
+
+- Copy published files to `/opt/api/`
+- Ensure files exist (dll, appsettings.json, etc.)
+
+Example files present in `/opt/api`:
+
+- `Taekwondo.WebApi.dll`
+- `appsettings.json`
+- `appsettings.Development.json`
+
+---
+
+## Step 5: Configure appsettings.json
+
+Edit `/opt/api/appsettings.json` to include your database connection:
+
+```
+{
+  "ConnectionStrings": {
+    "DefaultConnection": "Host=localhost;Database=apidatabase;Username=api;Password=abcd1234"
+  }
+}
+```
+
+---
+
+## Step 6: Create systemd Service for API
+
+Create `/etc/systemd/system/mydotnetapi.service` with:
+
+```
+[Unit]
+Description=My .NET Web API
+After=network.target
+
+[Service]
+WorkingDirectory=/opt/api
+ExecStart=/usr/bin/dotnet /opt/api/Taekwondo.WebApi.dll
+Restart=always
+RestartSec=10
+SyslogIdentifier=dotnet-api
+User=www-data
+Environment=ASPNETCORE_ENVIRONMENT=Production
+
+[Install]
+WantedBy=multi-user.target
+```
+
+Reload systemd and start service:
+
+```
+sudo systemctl daemon-reload
+sudo systemctl enable mydotnetapi
+sudo systemctl start mydotnetapi
+sudo systemctl status mydotnetapi
+```
+
+---
+
+## Step 7: Testing API
+
+- Use `curl` or Postman to test API endpoints, e.g.:
+
+```
+curl http://localhost:5000/api/your-endpoint
+```
+
+- Check logs in case of issues:
+
+```
+sudo journalctl -u mydotnetapi -f
+```
+
+---
+
+## Troubleshooting
+
+- **Status=200/CHDIR error:** Ensure working directory exists and user permissions are correct:
+
+```
+sudo mkdir -p /opt/api
+sudo chown www-data:www-data /opt/api
+```
+
+- Database connection errors: Verify `appsettings.json` connection string and PostgreSQL is running.
+
+- Warning `could not change directory to "/root": Permission denied` in psql is safe to ignore.
+
+---
+
+## Notes
+
+- Adjust firewall and reverse proxy as needed.
+- Ensure PostgreSQL allows connections from your API IP if running separately.
+- Tailor environment (e.g., `ASPNETCORE_ENVIRONMENT` setting) for development or production.
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