Perform OS-Level Kernel Tuning

Sysctl: vm.max_map_count

Some components in the Opstella stack (e.g., SonarQube, Elasticsearch-based services) require a higher limit on the number of memory map areas a process may have.

This is REQUIRED for ALL Worker Nodes in your Kubernetes Cluster.

Failure to set this parameter may cause these services to fail to start or crash unexpectedly.

To set this value permanently, add or update the vm.max_map_count setting in /etc/sysctl.conf.

... (deducted)
vm.max_map_count=262144

After add the setting, Reload systctl configuration

sudo sysctl --system
sudo systemctl restart systemd-sysctl

To verify, run sudo sysctl vm.max_map_count. should return 262144