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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