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!
Comments !