Sysctl Command--linux command application of large dictionary 729 commands interpretation

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Sysctl Command

use the SYSCTL command to configure kernel parameters while the system is running, and the available parameters are listed in the/proc/sys directory.

Command syntax:

sysctl[ options ] [ parameter = value ]

sysctl[ options ]

The meanings of the options in the command are as follows is shown.

table sysctl command options meaning

Options	Meaning
-w	temporarily change the value of a specified parameter
-a	show all currently available values
-a	with -a options functions
-P	loads the system parameters from the specified file, if not specified, from the /etc/sysctl.conf loaded in the file

Example : View all the system kernel parameters.

[Email protected] ~]# sysctl-a

kernel.sched_child_runs_first= 0

kernel.sched_min_granularity_ns= 1000000

kernel.sched_latency_ns= 5000000

kernel.sched_wakeup_granularity_ns= 1000000

Kernel.sched_tunable_scaling= 1

kernel.sched_features= 3183

kernel.sched_migration_cost= 500000

Kernel.sched_nr_migrate= 32

kernel.sched_time_avg= 1000

kernel.sched_shares_window= 10000000

Kernel.timer_migration= 1

kernel.sched_rt_period_us= 1000000

Kernel.sched_rt_runtime_us= 950000

kernel.sched_compat_yield= 0

kernel.sched_autogroup_enabled= 0

Kernel.sched_cfs_bandwidth_slice_us= 5000

Kernel.panic = 0

Kernel.exec-shield = 1

Kernel.core_uses_pid =1

Kernel.core_pattern =core

Kernel.core_pipe_limit= 4

kernel.tainted = 0

........................ (omitted)

Example : Load The/etc/sysctl.conf file system kernel parameters.

[Email protected] ~]# sysctl-p

Net.ipv4.ip_forward =0

Net.ipv4.conf.default.rp_filter= 1

net.ipv4.conf.default.accept_source_route= 0

KERNEL.SYSRQ = 0

Kernel.core_uses_pid =1

Net.ipv4.tcp_syncookies= 1

Error: "Net.bridge.bridge-nf-call-ip6tables" is an unknown key

Error: "Net.bridge.bridge-nf-call-iptables" is an unknown key

Error: "Net.bridge.bridge-nf-call-arptables" is an unknown key

KERNEL.MSGMNB = 65536

Kernel.msgmax = 65536

Kernel.shmmax =68719476736

Kernel.shmall =4294967296

Example : View fs.file-max kernel parameters.

[Email protected] ~]# Sysctlfs.file-max

Fs.file-max = 98007

the value of the Fs.file-max kernel parameter is 98007

Example : Temporarily change fs.file-max kernel parameters.

[Email protected] ~]# sysctl-w fs.file-max=60000

Fs.file-max = 60000

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Sysctl Command--linux command application of large dictionary 729 commands interpretation