How do I set up linkage between Docker containers so that restarting won't break it?

Question

I have a few Docker containers running like:

• Nginx
• Web app 1
• Web app 2
• PostgreSQL

Since Nginx needs to connect to the

Answer 1

Another alternative is to use the --net container:$CONTAINER_ID option.

Step 1: Create "network" containers

docker run --name db_net ubuntu:14.04 sleep infinity
docker run --name app1_net --link db_net:db ubuntu:14.04 sleep infinity
docker run --name app2_net --link db_net:db ubuntu:14.04 sleep infinity
docker run -p 80 -p 443 --name nginx_net --link app1_net:app1 --link app2_net:app2 ubuntu:14.04 sleep infinity

Step 2: Inject services into "network" containers

docker run --name db --net container:db_net pgsql
docker run --name app1 --net container:app1_net app1
docker run --name app2 --net container:app1_net app2
docker run --name nginx --net container:app1_net nginx

As long as you do not touch the "network" containers, the IP addresses of your links should not change.