Everytime I start docker-machine, I need to set a configuration like below.
host> docker-machine ssh default
docker> sudo sysctl -w vm.max_map_count=262144
I would like to this configuration as default, so I don't need to set it no more.
Boot2Docker allows for local customisation.
Add your sysctl command to /var/lib/boot2docker/bootsync.sh to have it run before docker starts.
echo 'sysctl -w vm.max_map_count=262144' >> /var/lib/boot2docker/bootsync.sh
chmod 755 /var/lib/boot2docker/bootsync.sh