Make Docker Containers Talk To Each Other

Each container encapsulates its contents so use ports for communication instead of trying to just openly expose the full filesystem of one container to another. Create network with docker network create command and use network option when running containers. You looked for help in the official docker docs and even with those instructions you can t get two containers to talk to each other.

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Use docker compose to run both containers so they implicitely share custom network.

Make docker containers talk to each other. Networking is a complicated topic. Add containers to the mix and it becomes a real headache. Your container can link each other so you can access them directly by a name don t care too much about the ip. I cannot make a sails container and a postgress container to communicate.

As mentioned earlier docker containers are attached to bridge or docker0 network by default if no other network is mentioned. Take a note that all containers within the same bridge network can communicate with each other via ip addresses. Ping ing by the host names works which means that the containers can see each other but when i make calls to the database from the server app i get connection refused error that is why i assume the problem is in the port exposure. Do not use a local port but the name of the link.

If both applications need access to the same filesystem consider running both in the same container. On local host use docker compose to startup your containers and use link. However they cannot resolve container names so communication via container names is not possible. You could read several books and spend days trying to understand the fundamentals of networking.