Docker 1.9.0 and the new network configuration

Docker 1.9 is here and it introduces a new way to handle the networking between containers.
Because docker containers should live a short live before being replaced with their new versions one should ask himself do we really need the static IP that was existing until now and assigned to the Docker’s bridge? The usual IP you will see was 172.17.42.1.

After upgrading this IP will be gone. Instead other IPs will be created dynamically. Of course there will be another IP like 172.17.0.1 assigned to the docker0 bridge. You can use it if you are brave enough but better not.
However if you need a quick fix before going to bed you can use the Docker’s –bip parameter to set the bridge IP back to 172.17.42.1.

Another way is to go back to version 1.7.1 using your OS’s package manager or direct install/compile.
Later when you decide to start using Docker’s networking the right and better way, you can start from here.

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About Iliyan Trifonov

Web Developer, Blogger
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