consul-template

HashiCorp's consul template with netcat-openbsd for signaling containers

Setup consul template in docker-compose.yml to write the template mounted in /etc/consul-template/nginx.conf.ctmpl to /tmp/nginx/nginx.conf and execute the restart-nginx script whenever the containers change:

consultemplate:
  image: quay.io/orgsync/consul-template:0.14.0
  working_dir: /etc/consul-template
  command: >
    -consul 172.17.0.1:8500
    -template "nginx.conf.ctmpl:/tmp/nginx/nginx.conf:./restart-nginx"
  volumes:
    - ./docker/config/consul-template:/etc/consul-template
    - /var/run/docker.sock:/tmp/docker.sock
    - /tmp/nginx:/tmp/nginx
  links:
    - consul

nginx:
  image: nginx
  ports:
    - "80:80"
  volumes:
    - /tmp/nginx:/tmp/nginx
  command: nginx -g "daemon off;" -c "/tmp/nginx/nginx.conf"

In restart-nginx, send a HUP signal to nginx:

#!/bin/bash -e

NAME=orgsync_nginx_1
SIGNAL=HUP
COMMAND="POST /containers/${NAME}/kill?signal=${SIGNAL} HTTP/1.0\n"
echo -e $COMMAND | nc -U /tmp/docker.sock