How to configure MTU for the Docker network

Posted by Alexander Todorov on Fri 08 December 2017

On one of my Jenkins slaves I've been experiencing problems when downloading files from the network. In particular with cabal update which fetches data from hackage.haskell.org. As suggested by David Roble the problem and solution lies in the MTU configured for the default docker0 interface!

By default docker0 had MTU of 1500 which should be lower than the host eth0 MTU of 1400! To configure this before the docker daemon is started place any non-default settings in /etc/docker/daemon.json! For more information head to https://docs.docker.com/engine/userguide/networking/default_network/custom-docker0/.

Thanks for reading and happy testing!

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