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elasticsearchkubernetesgoogle-kubernetes-engine

Set vm.max_map_count on cluster nodes

I try to install ElasticSearch (latest) on a cluster nodes on Google Container Engine but ElasticSearch needs the variable : vm.max_map_count to be >= 262144.

If I ssh to every nodes and I manually run :

sysctl -w vm.max_map_count=262144

All goes fine then, but any new node will not have the specified configuration.

So my questions is :

Is there a way to load a system configuration on every nodes at boot time ? Deamon Set would not be the good solution because inside a docker container, the system variables are read-only.

I'm using a fresh created cluster with the gci node image.

Solution

  • You should be able to use a DaemonSet to emulate the behavior of a startup script. If the script needs to do root-level actions on the node, you can configure the DaemonSet pods to run in privileged mode.

    For an example of how to do this, see https://github.com/kubernetes/contrib/tree/master/startup-script