First commit

Dockerfile

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+FROM alpine:latest
+LABEL maintainer.name="Matteo Pietro Dazzi" \
+    maintainer.email="matteopietro.dazzi@gmail.com" \
+    version="1.0" \
+    description="OpenVPN client configured for SurfShark VPN"
+ENV SURFSHARK_USER=
+ENV SURFSHARK_PASSWORD=
+ENV SURFSHARK_COUNTRY=
+ENV CONNECTION_TYPE=tcp
+HEALTHCHECK --interval=60s --timeout=10s --start-period=30s CMD curl -L 'https://ipinfo.io'
+RUN apk add --update --no-cache openvpn wget unzip coreutils curl
+WORKDIR /vpn
+COPY startup.sh .
+RUN chmod +x ./startup.sh
+ENTRYPOINT [ "./startup.sh" ]

README.md

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+# docker-surfshark
+
+Docker container with OpenVPN client preconfigured for SurfShark
+
+------------------------------------------------
+![logo](./images/logo.png)
+
+This is a [multi-arch](https://medium.com/gft-engineering/docker-why-multi-arch-images-matters-927397a5be2e) image, updated automatically thanks to [GitHub Actions](https://github.com/features/actions).
+
+Its purpose is to provide the [SurfShark VPN](https://surfshark.com/) to all your containers. 
+
+The link is established using the [OpenVPN](https://openvpn.net/) client.
+
+## Configuration
+
+The container is configurable using 4 environment variables:
+
+| Name | Mandatory | Description |
+|------|-----------|-------------|
+|SURFSHARK_USER|Yes|Username provided by SurfShark|
+|SURFSHARK_PASSWORD|Yes|Password provided by SurfShark|
+|SURFSHARK_COUNTRY|No|The country, supported by SurfShark, in which you want to connect|
+|CONNECTION_TYPE|No|The connection type that you qant to use: tcp, udp|
+
+`SURFSHARK_USER` and `SURFSHARK_PASSWORD` are provided at the bottom of this page: [https://account.surfshark.com/setup/manual](https://account.surfshark.com/setup/manual).
+
+![SurfShark credentials](https://support.surfshark.com/hc/article_attachments/360007351360/6.png)
+
+## Execution
+
+You can run this image using [Docker compose](https://docs.docker.com/compose/) and the [sample file](./docker-compose.yml) provided.
+
+```
+version: "2"
+
+services: 
+    surfshark:
+        image: ilteoood:docker-surfshark
+        container_name: surfshark
+        environment: 
+            - SURFSHARK_USER=YOUR_SURFSHARK_USER
+            - SURFSHARK_PASSWORD=YOUR_SURFSHARK_PASSWORD
+            - SURFSHARK_COUNTRY=it
+            - CONNECTION_TYPE=udp
+        cap_add: 
+            - NET_ADMIN
+        devices:
+            - /dev/net/tun
+        restart: unless-stopped
+```
+
+Or you can use the standard `docker run` command.
+
+```sh
+sudo docker run -it --cap-add=NET_ADMIN --device /dev/net/tun --name CONTAINER_NAME -e SURFSHARK_USER=YOUR_SURFSHARK_USER -e SURFSHARK_PASSWORD=YOUR_SURFSHARK_PASSWORD ilteoood:docker-surfshark
+```
+
+If you want to attach a container to the VPN, you can simply run:
+
+```sh
+sudo docker run -it --net=container:CONTAINER_NAME alpine /bin/sh
+```
+
+If you face network connection problems, I suggest you to set a specific DNS server for each container.

docker-compose.yml

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+version: "2"
+
+services: 
+    surfshark:
+        image: ilteoood:latest
+        container_name: surfshark
+        environment: 
+            - SURFSHARK_USER=YOUR_SURFSHARK_USER
+            - SURFSHARK_PASSWORD=YOUR_SURFSHARK_PASSWORD
+            - SURFSHARK_COUNTRY=it
+            - CONNECTION_TYPE=udp
+        cap_add: 
+            - NET_ADMIN
+        devices:
+            - /dev/net/tun
+        restart: unless-stopped

startup.sh

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+#!/bin/sh
+rm -rf ovpn_configs*
+wget -O ovpn_configs.zip https://api.surfshark.com/v1/server/configurations
+unzip ovpn_configs.zip -d ovpn_configs
+cd ovpn_configs
+VPN_FILE=$(ls | grep "${SURFSHARK_COUNTRY}-" | grep "${CONNECTION_TYPE}" | shuf | head -n 1)
+echo Choosed: ${VPN_FILE}
+printf "${SURFSHARK_USER}\n${SURFSHARK_PASSWORD}" > vpn-auth.txt
+openvpn --config $VPN_FILE --auth-user-pass vpn-auth.txt