Boot2docker: Increase virtual memory vm.max_map_count in boot2docker

[nguoianphu]

I want to run Elasticsearch 5.0 with my Docker Toolbox. But it requires us to increase the vm.max_map_count to 262144 (https://www.elastic.co/guide/en/elasticsearch/reference/master/vm-max-map-count.html). I can do it by running these commands.

docker-machine ssh default
sysctl -w vm.max_map_count=262144
# Update the vm.max_map_count setting in /etc/sysctl.conf.

But they are reset after I re-boot my host. How to make boot2docker keeps these settings?

[yosifkit]

You can put it in /var/lib/boot2docker/profile.

[kjellski]

How would one put it in there? Is ther something like "EXEC" or so?

Right now the content of /var/lib/boot2docker/profile looks like this:

EXTRA_ARGS='
--label provider=virtualbox

'
CACERT=/var/lib/boot2docker/ca.pem
DOCKER_HOST='-H tcp://0.0.0.0:2376'
DOCKER_STORAGE=aufs
DOCKER_TLS=auto
SERVERKEY=/var/lib/boot2docker/server-key.pem
SERVERCERT=/var/lib/boot2docker/server.pem

[yosifkit]

Its just sourced as a shell script so you can drop it right in.

EXTRA_ARGS='
--label provider=virtualbox

'
CACERT=/var/lib/boot2docker/ca.pem
DOCKER_HOST='-H tcp://0.0.0.0:2376'
DOCKER_STORAGE=aufs
DOCKER_TLS=auto
SERVERKEY=/var/lib/boot2docker/server-key.pem
SERVERCERT=/var/lib/boot2docker/server.pem

# Update the vm.max_map_count setting
sysctl -w vm.max_map_count=262144

[kjellski]

@yosifkit thanks, that was the missing part, I didn't know that one can just put a command there for inside the docker container...

Thank you!