5.3. Configuring kernel parameters permanently with sysctl

Use the sysctl command to permanently set kernel parameters.

Prerequisites

Procedure

List all parameters:
```
# sysctl -a
```
The command displays all kernel parameters that can be configured at runtime.
Configure a parameter permanently:
```
# sysctl -w <TUNABLE_CLASS>.<PARAMETER>=<TARGET_VALUE> >> /etc/sysctl.conf
```
The sample command changes the tunable value and writes it to the /etc/sysctl.conf file, which overrides the default values of kernel parameters. The changes take effect immediately and persistently, without a need for restart.
注意
To permanently modify kernel parameters, you can also make manual changes to the configuration files in the /etc/sysctl.d/ directory.