Init commit.

.gitignore

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+config.ovpn
+auth.txt

Dockerfile

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+FROM alpine:latest
+
+RUN apk add bash openvpn openresolv
+ADD https://raw.githubusercontent.com/alfredopalhares/openvpn-update-resolv-conf/master/update-resolv-conf.sh \
+    /etc/openvpn/update-resolv-conf
+COPY start-openvpn.sh /usr/local/bin/start-openvpn.sh
+RUN chmod +x /etc/openvpn/update-resolv-conf
+RUN chmod +x /usr/local/bin/start-openvpn.sh
+ENTRYPOINT [ "start-openvpn.sh" ]

docker-compose.yml

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+version: '3.3'
+services:
+  openvpn:
+    restart: never
+    build:
+      context: ./
+      dockerfile: Dockerfile
+    volumes:
+      - ./config.ovpn:/opt/config.ovpn
+      - ./auth.txt:/opt/auth.txt
+    cap_add:
+     - NET_ADMIN

start-openvpn.sh

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+#!/usr/bin/env sh
+
+create_net_dev() {
+    mkdir -p /dev/net
+    mknod /dev/net/tun c 10 200
+    chmod 600 /dev/net/tun
+}
+
+create_net_dev
+"$@"