Dante proxy with docker-compose setup

docker-compose.yml

version: '2'

services:
  proxy:
    #image: vimagick/dante
    build:
      context: .
      args:
      - proxy_user=myuser
      - proxy_pass=mypassword
    ports:
    - "0.0.0.0:3333:3333"
    restart: unless-stopped

Dockerfile

FROM vimagick/dante
ARG proxy_user
ARG proxy_pass
ADD ./sockd.conf /etc/sockd.conf
RUN echo "\n\tCreating a new user for proxy\n\t\tusername: $proxy_user\n\t\tpassword: $proxy_pass\n\n" \
  && useradd $proxy_user \
  && echo $proxy_user:$proxy_pass | chpasswd
EXPOSE 3333

sockd.conf

debug: 0
logoutput: stderr

internal: 0.0.0.0 port = 3333
external: eth0

socksmethod: username none
clientmethod: none

user.privileged: root
user.unprivileged: nobody

client pass {
    from: 0.0.0.0/0 port 1-65535 to: 0.0.0.0/0
    log: error
}

socks pass {
    from: 0.0.0.0/0 to: 0.0.0.0/0
    #socksmethod: username
    log: error
}