Sysctl configuration

In order for Cassandra to operate correctly, mr-cassop sets some sysctl parameters by default.

They can be overriden by setting the .spec.cassandra.sysctls map in the following way:

apiVersion: db.ibm.com/v1alpha1
kind: CassandraCluster
metadata:
  name: test-cluster
spec:
  cassandra:
    sysctls:
      net.ipv4.ip_local_port_range: "1025 65530"
      net.ipv4.tcp_rmem: "4096 87380 16777216"
      net.ipv4.tcp_wmem: "4096 65536 16777216"

Default values:

Name	Default Value
net.ipv4.ip_local_port_range	1025 65535
net.ipv4.tcp_rmem	4096 87380 16777216
net.ipv4.tcp_wmem	4096 65536 16777216
net.core.somaxconn	65000
net.ipv4.tcp_ecn	0
net.ipv4.tcp_window_scaling	1
vm.dirty_background_bytes	10485760
vm.dirty_bytes	1073741824
fs.file-max	1073741824
vm.max_map_count	1073741824
vm.swappiness	1