9.10.5. Configuring System Control Settings

OpenShift Enterprise uses semaphores, ports, and connection tracking extensively. Apply the following changes to the default /etc/sysctl.conf file to enable this usage.

Procedure 9.8. To Configure the sysctl Settings:

  1. Open the /etc/sysctl.conf file and append the following line to increase kernel semaphores to accommodate more httpds: 
    kernel.sem = 250  32000 32  4096
  2. Append the following line to the same file to increase the ephemeral port range to accommodate application proxies: 
    net.ipv4.ip_local_port_range = 15000 35530
  3. Append the following line to the same file to increase the connection-tracking table size: 
    net.netfilter.nf_conntrack_max = 1048576
  4. Append the following line to the same file to enable forwarding for the port proxy: 
    net.ipv4.ip_forward = 1
  5. Append the following line to the same file to allow the port proxy to route using loopback addresses: 
    net.ipv4.conf.all.route_localnet = 1
  6. Run the following command to reload the sysctl.conf file and activate the new settings: 
    # sysctl -p /etc/sysctl.conf

Note

If you use the kickstart or bash script, the configure_sysctl_on_node function performs these steps.