Difference between revisions of "sysctl and sysfs"
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== sysctl settings -- "/etc/sysctl.conf" and "/etc/sysctl.d/" == | == sysctl settings -- "/etc/sysctl.conf" and "/etc/sysctl.d/" == | ||
| − | Sysctl will accept either '''.''' or '''/''' in key names. | + | Sysctl will accept either '''.''' or '''/''' in key names. Most commonly you see '''.''' used in config files. Be sure to trim off the leading '''/proc/sys/''' before using it with '''sysctl'''. For example, the last two commands below are equivalent. |
<pre> | <pre> | ||
cat /proc/sys/vm/swappiness | cat /proc/sys/vm/swappiness | ||
sysctl vm.swappiness | sysctl vm.swappiness | ||
| − | sysctl -w vm.swappiness= | + | sysctl -w vm.swappiness=10 |
| − | sysctl -w vm/swappiness= | + | sysctl -w vm/swappiness=10 |
</pre> | </pre> | ||
| − | These settings | + | These settings are usually found in a conf file, '''/etc/sysctl.conf''' or in a script under the directory, '''/etc/sysctl.d/''', such as '''/etc/sysctl.d/60-local.conf'''. |
Latest revision as of 01:00, 22 January 2014
sysctl vs. sysfs
Don't confuse these two. The sysctl interface is for stuff under /proc/sys, whereas sysfs is for stuff under /sys (or anywhere a sysfs filesystem is mounted).
Under Ubuntu/Debian you may need to install the procps package to support sysctl and for processing /etc/sysctl.conf at boot. You may also need to install the sysfsutils package to support sys tool and for processing /etc/sysfs.conf at boot.
sysfs settings -- "/etc/sysfs.conf" and "/etc/sysfs.d/"
The systool' command is not often useful. It provides no way to modify attributes and most of the same information can be found under /sys/. The systool command can be used like this:
systool -c block sda -v
sysctl settings -- "/etc/sysctl.conf" and "/etc/sysctl.d/"
Sysctl will accept either . or / in key names. Most commonly you see . used in config files. Be sure to trim off the leading /proc/sys/ before using it with sysctl. For example, the last two commands below are equivalent.
cat /proc/sys/vm/swappiness sysctl vm.swappiness sysctl -w vm.swappiness=10 sysctl -w vm/swappiness=10
These settings are usually found in a conf file, /etc/sysctl.conf or in a script under the directory, /etc/sysctl.d/, such as /etc/sysctl.d/60-local.conf.
