Sysctl: Unterschied zwischen den Versionen

Aus Foxwiki
KKeine Bearbeitungszusammenfassung
K Textersetzung - „Man-Pages“ durch „Man-Page“
 
(25 dazwischenliegende Versionen desselben Benutzers werden nicht angezeigt)
Zeile 1: Zeile 1:
{{DISPLAYTITLE:sysctl}}
'''sysctl''' configure kernel parameters at runtime
'''sysctl''' configure kernel parameters at runtime


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


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


= PARAMETERS =
'''variable'''
variable
* is the name of a key to read from.  
The name of a key to read from. An example is kernel.ostype. The '/' separator is also accepted in place of a '.'.
* 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.
 
-n, --values
Use this option to disable printing of the key name when printing values.
 
-e, --ignore
Use this option to ignore errors about unknown keys.
 
-N, --names
Use this option to only print the names.  It may be useful with shells that have programmable completion.
 
-q, --quiet
Use this option to not display the values set to stdout.
 
-w, --write
Use this option when you want to change a sysctl setting.
 
-p[FILE], --load[=FILE]
Load in sysctl settings from the file specified or /etc/sysctl.conf if none given.  Specifying - as filename means reading
data from standard input.  Using this option will mean arguments to sysctl are files, which are read in the order they are
specified.  The file argument may be specified as regular expression.
 
-a, --all
Display all values currently available.
 
--deprecated
Include deprecated parameters to --all values listing.
 
-b, --binary
Print value without new line.
 
--system
Load settings from all system configuration files.
/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
 
-r, --pattern pattern
Only apply settings that match pattern.  The pattern uses extended regular expression syntax.
 
-A    Alias of -a
 
-d    Alias of -h
 
-f    Alias of -p
 
-X    Alias of -a
 
-o    Does nothing, exists for BSD compatibility.
 
-x    Does nothing, exists for BSD compatibility.


-h, --help
'''variable=value'''
Display help text and exit.
* is used to set a key, in 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.


-V, --version
= Parateter =
Display version information and exit.
{| class="wikitable sortable"
|-
| -n, --values || Use this option to disable printing of the key name when printing values.
|-
| -e, --ignore || Use this option to ignore errors about unknown keys.
|-
| -N, --names || Use this option to only print the names. It may be useful with shells that have programmable completion.
|-
| -q, --quiet || Use this option to not display the values set to stdout.
|-
| -w, --write || Use this option when you want to change a sysctl setting.
|-
| -p[FILE], --load[=FILE] || Load in sysctl settings from the file specified or /etc/sysctl.conf if none given. Specifying - as filename means reading data from standard input. Using this option will mean arguments to sysctl are files, which are read in the order they are specified. The file argument may be specified as regular expression.
|-
| -a, --all || Display all values currently available.
|-
| --deprecated || Include deprecated parameters to --all values listing.
|-
| -b, --binary || Print value without new line.
|-
| --system || Load settings from all system configuration files. /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
|-
| -r, --pattern pattern || Only apply settings that match pattern. The pattern uses extended regular expression syntax.
|-
| -A  || Alias of -a
|-
| -d  || Alias of -h
|-
| -f  || Alias of -p
|-
| -X  || Alias of -a
|-
| -o  || Does nothing, exists for BSD compatibility.
|-
| -x  || Does nothing, exists for BSD compatibility.
|-
| -h, --help || Display help text and exit.
|-
| -V, --version || Display version information and exit.
|}


EXAMPLES
= Beispiele =
  /sbin/sysctl -a
  /sbin/sysctl -a
  /sbin/sysctl -n kernel.hostname
  /sbin/sysctl -n kernel.hostname
Zeile 88: Zeile 72:
  /sbin/sysctl --system --pattern '^net.ipv6'
  /sbin/sysctl --system --pattern '^net.ipv6'


DEPRECATED PARAMETERS
= Veraltete Parameter =
The base_reachable_time and retrans_time are deprecated. The sysctl command does not allow changing values of these parameters.
* The base_reachable_time and retrans_time are deprecated.  
Users who insist to use deprecated kernel interfaces should push values to /proc file system by other means. For example:
* 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
  echo 256 > /proc/sys/net/ipv6/neigh/eth0/base_reachable_time


FILES
= Dateien =
  /proc/sys
  /proc/sys
  /etc/sysctl.conf
  /etc/sysctl.conf


SEE ALSO
= Links =
sysctl.conf(5) regex(7)
== Intern ==
== Weblinks ==
# https://github.com/klaver/sysctl


procps-ng
= Man-Page =
sysctl.conf(5) regex(7)


[[Kategorie:Linux:Befehl]]
[[Kategorie:Linux/Befehl]]
[[Kategorie:Linux:Kernel]]
[[Kategorie:Linux/Kernel]]
[[Kategorie:Linux:Sicherheit]]
[[Kategorie:Linux/Sicherheit]]
{{DEFAULTSORT:sysctl}}

Aktuelle Version vom 6. November 2024, 12:58 Uhr


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] [...]

variable

  • is the name of a key to read from.
  • An example is kernel.ostype. The '/' separator is also accepted in place of a '.'.

variable=value

  • is used to set a key, in 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.

Parateter

-n, --values Use this option to disable printing of the key name when printing values.
-e, --ignore Use this option to ignore errors about unknown keys.
-N, --names Use this option to only print the names. It may be useful with shells that have programmable completion.
-q, --quiet Use this option to not display the values set to stdout.
-w, --write Use this option when you want to change a sysctl setting.
-p[FILE], --load[=FILE] Load in sysctl settings from the file specified or /etc/sysctl.conf if none given. Specifying - as filename means reading data from standard input. Using this option will mean arguments to sysctl are files, which are read in the order they are specified. The file argument may be specified as regular expression.
-a, --all Display all values currently available.
--deprecated Include deprecated parameters to --all values listing.
-b, --binary Print value without new line.
--system Load settings from all system configuration files. /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
-r, --pattern pattern Only apply settings that match pattern. The pattern uses extended regular expression syntax.
-A Alias of -a
-d Alias of -h
-f Alias of -p
-X Alias of -a
-o Does nothing, exists for BSD compatibility.
-x Does nothing, exists for BSD compatibility.
-h, --help Display help text and exit.
-V, --version Display version information and exit.

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'

Veraltete 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

Links

Intern

Weblinks

  1. https://github.com/klaver/sysctl

Man-Page

sysctl.conf(5) regex(7)