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:

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
```
```
kernel.sem = 250  32000 32  4096
```
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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
```
```
net.ipv4.ip_local_port_range = 15000 35530
```
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Append the following line to the same file to increase the connection-tracking table size:
```
net.netfilter.nf_conntrack_max = 1048576
```
```
net.netfilter.nf_conntrack_max = 1048576
```
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Append the following line to the same file to enable forwarding for the port proxy:
```
net.ipv4.ip_forward = 1
```
```
net.ipv4.ip_forward = 1
```
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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
```
```
net.ipv4.conf.all.route_localnet = 1
```
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Run the following command to reload the sysctl.conf file and activate the new settings:
```
sysctl -p /etc/sysctl.conf
```
```
# sysctl -p /etc/sysctl.conf
```
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Note

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

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9.10.5. Configuring System Control Settings

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