Sysctl

sysctl configure kernel parameters at runtime

Beschreibung

• sysctl is used to modify kernel parameters at runtime.
• The parameters available are those listed under /proc/sys/.
• Procfs is required for sysctl support in Linux. You can use sysctl to both read and write sysctl data.

Syntax

sysctl [options] [variable[=value]] [...]
sysctl -p [file or regexp] [...]

Parateter

/run/sysctl.d/*.conf /etc/sysctl.d/*.conf /usr/local/lib/sysctl.d/*.conf /usr/lib/sysctl.d/*.conf /lib/sysctl.d/*.conf /etc/sysctl.conf

variable	The name of a key to read from. An example is kernel.ostype. The '/' separator is also accepted in place of a '.'.
variable=value	To set a key, use the form variable=value where variable is the key and value is the value to set it to. If the value contains quotes or characters which are parsed by the shell, you may need to enclose the value in double quotes. This requires the -w parameter to use.

Beispiele

/sbin/sysctl -a
/sbin/sysctl -n kernel.hostname
/sbin/sysctl -w kernel.domainname="example.com"
/sbin/sysctl -p/etc/sysctl.conf
/sbin/sysctl -a --pattern forward
/sbin/sysctl -a --pattern forward$
/sbin/sysctl -a --pattern 'net.ipv4.conf.(eth|wlan)0.arp'
/sbin/sysctl --system --pattern '^net.ipv6'

= Veraötete Parameter =
The base_reachable_time and retrans_time are deprecated. The sysctl command does not allow changing values of these parameters.
Users who insist to use deprecated kernel interfaces should push values to /proc file system by other means. For example:

echo 256 > /proc/sys/net/ipv6/neigh/eth0/base_reachable_time

Dateien

/proc/sys
/etc/sysctl.conf

Man-Pages

sysctl.conf(5) regex(7)

procps-ng