====== 安裝 ovpn-admin (OpenVPN + 簡易 WebUI) 方案 ======
  * 為解決 [[tech/dockovpn|DockOVPN (OpenVPN Docker方案)]] 無 WebUI 可管理 VPN 帳號, 因此找到這 **[[https://github.com/flant/ovpn-admin|ovpn-admin]]** 方案
  * 安裝環境
    * VM : 2 vCore, 2G RAM, 32G SSD
    * OS : Alpine 3.21 + Docker Compose
  * 規劃環境
    * OpenVPN 內部網路 : 10.16.0.0/24
    * 外部聯入 VPN : vpn.mydomain.com TCP Port 443

===== 安裝設定 =====
  - Alpine 3.21 Kernel 啟用 ip_tables<cli>
modprobe ip_tables
echo 'ip_tables' >> /etc/modules
reboot
</cli>
  - 加上 tun device <cli>
mkdir -p /dev/net
mknod /dev/net/tun c 10 200
chmod 666 /dev/net/tun
# 檢查模組是否已載入
lsmod | grep tun
# 如果沒有載入,則執行:
modprobe tun
echo "tun" >> /etc/modules
</cli>
  - 編輯 docker-compose.yml <file>
services:
  openvpn:
    container_name: openvpn
    restart: unless-stopped
    image: flant/ovpn-admin:openvpn-latest
    command: /etc/openvpn/setup/configure.sh
    environment:
      OVPN_SERVER_NET: "10.16.0.0"
      OVPN_SERVER_MASK: "255.255.255.0"
      OVPN_PASSWD_AUTH: "true"
    cap_add:
      - NET_ADMIN
    devices:
      - /dev/net/tun 
    ports:
      - 443:1194 # for openvpn
    volumes:
      - ./easyrsa_master:/etc/openvpn/easyrsa
      - ./ccd_master:/etc/openvpn/ccd
      - ./Dockovpn:/tmp
      #- ./openvpn.conf:/etc/openvpn/setup/openvpn.conf
  ovpn-admin:
    container_name: ovpn-admin
    restart: unless-stopped
    image: flant/ovpn-admin
    command: /app/ovpn-admin
    environment:
      OVPN_DEBUG: "true"
      OVPN_VERBOSE: "true"
      OVPN_NETWORK: "10.16.0.0/24"
      OVPN_CCD: "true"
      OVPN_CCD_PATH: "/mnt/ccd"
      EASYRSA_PATH: "/mnt/easyrsa"
      OVPN_SERVER: "vpn.mydomain.com:443:tcp"
      OVPN_INDEX_PATH: "/mnt/easyrsa/pki/index.txt"
      OVPN_AUTH: "true"
      OVPN_AUTH_DB_PATH: "/mnt/easyrsa/pki/users.db"
      LOG_LEVEL: "debug"
    network_mode: service:openvpn
    volumes:
      - ./easyrsa_master:/mnt/easyrsa
      - ./ccd_master:/mnt/ccd
  openvpn-monitor:
    container_name: openvpn-monitor
    restart: unless-stopped
    image: ruimarinho/openvpn-monitor
    environment:
      TZ: "Asia/Taipei"
      OPENVPNMONITOR_DEFAULT_DATETIMEFORMAT: "%%Y/%%m/%%d %%H:%%M:%%S"
      OPENVPNMONITOR_SITES_0_SHOWDISCONNECT: "False"
      OPENVPNMONITOR_SITES_0_PORT: "8989"
      OPENVPNMONITOR_SITES_0_NAME: "openvpn"
      OPENVPNMONITOR_SITES_0_HOST: "localhost"
      OPENVPNMONITOR_SITES_0_ALIAS: "openvpn"
      OPENVPNMONITOR_DEFAULT_SITE: "My OpenVPN Sever"
      OPENVPNMONITOR_DEFAULT_MAPS: "True"
      OPENVPNMONITOR_DEFAULT_LONGITUDE: "121.51"
      OPENVPNMONITOR_DEFAULT_LOGO: ""
      OPENVPNMONITOR_DEFAULT_LATITUDE: "24.98"
    network_mode: service:openvpn
  nginx:
    container_name: nginx
    restart: unless-stopped
    image: nginx:latest
    ports:
      - 8080:8080 # for nginx
    volumes:
      - ./.htpasswd:/etc/nginx/.htpasswd:ro
      - ./default.conf:/etc/nginx/conf.d/default.conf:ro
</file>
  - 編輯 default.conf <file>
server {
  listen 8080;
  server_name 127.0.0.1;

  location /mon {
    rewrite /mon(.*) /$1 break;
    proxy_pass http://openvpn:80;
  }

  location / {
    auth_basic           "Pass";
    auth_basic_user_file /etc/nginx/.htpasswd;
    proxy_pass http://openvpn:8080;
  }
}
</file>
  - 產生管理者帳號密碼檔 .htpasswd Exp. 建立管理者 jonathan<cli>
apk add apache2-utils
htpasswd -c .htpasswd jonathan
cat .htpasswd
</cli> 應該可以看到類似 jonathan:$arpxxxxxxxxxxx 這樣的內容, 之後新增其他帳號就不需要 -c Exp. htpasswd .htpasswd myadm <WRAP center round tip 60%>
如果要驗證 htpasswd 設定的密碼是否正確, 可以用 **htpasswd -vb .htpasswd 帳號 密碼** 進行驗證 Exp.<cli>
ovpn-admin-246:~# htpasswd -vb .htpasswd myadm MyPasswod***
Password for user everstar correct.
</cli>
</WRAP>
  - 啟動 ovpn-admin 服務 <cli>
mkdir -p Dockovpn
chmod a+w Dockovpn
docker compose up -d
</cli>

  * 如果要管理 vpn 帳號 - http://server-ip:8080/
    * ++看範例畫面|{{:tech:螢幕擷取畫面_2024-06-25_155418.png|}}++
  * 如果要看線上 vpn 用戶 - http://server-ip:8080/mon
    * ++看範例畫面|{{:tech:螢幕擷取畫面_2024-06-25_155441.png|}}++

===== 安裝 openvpn-snmp-stats 強化監控 =====
  * 參考 - https://github.com/tryweb/-openvpn-snmp-stats/tree/alpine3
  * 安裝 openvpn.py <cli>
apk add --update --no-cache python3
ln -sf python3 /usr/bin/python
mkdir -p /opt/openvpn-snmp-stats/db
cd /opt/openvpn-snmp-stats
wget https://raw.githubusercontent.com/tryweb/-openvpn-snmp-stats/alpine3/openvpn.py
chmod a+x openvpn.py
</cli>安裝後可以先執行驗證 Exp.<cli>
openvpn-61:~# /opt/openvpn-snmp-stats/openvpn.py
{"errorString": "", "error": 0, "version": 1, "data": {"tun0": {"iv9614": {"minutes_since_last_handshake": 506, "bytes_rcvd": 106350, "bytes_sent": 78677}, "jonathan_pixel5": {"minutes_since_last_handshake": 535, "bytes_rcvd": 23584, "bytes_sent": 37931}, "jonathan": {"minutes_since_last_handshake": 536, "bytes_rcvd": 7086888, "bytes_sent": 41041820}, "UNDEF": {"minutes_since_last_handshake": 495, "bytes_rcvd": 0, "bytes_sent": 0}}}}
</cli>
  * 設定 snmpd.conf <cli>
vi /etc/snmp/snmpd.conf
</cli><file>
:

extend wireguard /opt/openvpn-snmp-stats/openvpn.py
</file><cli>
service snmpd restart
</cli>

===== FAQ =====
==== 1. 想修改 server.conf =====
  * 參考 - https://github.com/flant/ovpn-admin/issues/203
  * 將 /etc/openvpn/setup/openvpn.conf 複製出來, 改成自己想要的版本, 在掛上去使用
  * 處理方式 
    - <cli>docker cp openvpn:/etc/openvpn/setup/openvpn.conf .</cli>
    - <cli>vi openvpn.conf</cli>Exp. 加上 route 172.16.0.0/24 , route 172.16.1.0/24<file>
:
push "route 172.16.0.0 255.255.255.0"
push "route 172.16.1.0 255.255.255.0"
</file>
    - <cli>vi docker-compose.yml</cli>啟用 openvpn: -> volumes: -> ./openvpn.conf:/etc/openvpn/setup/openvpn.conf<file>
services:
  openvpn:
  :
  :
    volumes:
      - ./easyrsa_master:/etc/openvpn/easyrsa
      - ./ccd_master:/etc/openvpn/ccd
      - ./Dockovpn:/tmp
      - ./openvpn.conf:/etc/openvpn/setup/openvpn.conf
  :
</file>
    - 重新啟動 docker compose 讓設定生效<cli>docker compose up -d</cli>
    - 讓所有 VPN Client 斷線重新連入

==== 2. 想修改 Openvpn 為 UDP 模式  =====
  * 目前版本 [[https://github.com/flant/ovpn-admin/blob/master/setup/configure.sh|configure.sh]] 內是直接寫 Listen TCP , 除非比照 openvpn.conf 方式自己修改後掛上去處理<file>
:
openvpn --config /etc/openvpn/openvpn.conf --client-config-dir /etc/openvpn/ccd --port 1194 --proto tcp --management 127.0.0.1 8989 --dev tun0 --server ${OVPN_SRV_NET} ${OVPN_SRV_MASK}
</file>

===== 參考網址 =====
  * https://github.com/flant/ovpn-admin
  * https://github.com/flant/ovpn-admin/issues/212

{{tag>openvpn}}