Editing Sysctl
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==Introduction== | ==Introduction== | ||
The [https://www.freebsd.org/cgi/man.cgi?query=sysctl&apropos=0&sektion=0&manpath=FreeBSD+12.1-RELEASE+and+Ports&arch=default&format=html sysctl] utility retrieves kernel state and allows processes with appropriate privilege to set kernel state. The state to be retrieved or set is described using a “Management Information Base” (“MIB”) style name, described as a dotted set of components.<br/> | The [https://www.freebsd.org/cgi/man.cgi?query=sysctl&apropos=0&sektion=0&manpath=FreeBSD+12.1-RELEASE+and+Ports&arch=default&format=html sysctl] utility retrieves kernel state and allows processes with appropriate privilege to set kernel state. The state to be retrieved or set is described using a “Management Information Base” (“MIB”) style name, described as a dotted set of components.<br/> | ||
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The information available from sysctl consists of integers, strings, and opaque types. The sysctl utility only knows about a couple of opaque types, and will resort to hexdumps for the rest. The opaque information is much more useful if retrieved by special purpose programs such as [https://www.freebsd.org/cgi/man.cgi?query=ps&sektion=1&apropos=0&manpath=FreeBSD+12.1-RELEASE+and+Ports ps(1)], [https://www.freebsd.org/cgi/man.cgi?query=systat&sektion=1&apropos=0&manpath=FreeBSD+12.1-RELEASE+and+Ports systat(1)], and [https://www.freebsd.org/cgi/man.cgi?query=netstat&sektion=1&apropos=0&manpath=FreeBSD+12.1-RELEASE+and+Ports netstat(1)]. | The information available from sysctl consists of integers, strings, and opaque types. The sysctl utility only knows about a couple of opaque types, and will resort to hexdumps for the rest. The opaque information is much more useful if retrieved by special purpose programs such as [https://www.freebsd.org/cgi/man.cgi?query=ps&sektion=1&apropos=0&manpath=FreeBSD+12.1-RELEASE+and+Ports ps(1)], [https://www.freebsd.org/cgi/man.cgi?query=systat&sektion=1&apropos=0&manpath=FreeBSD+12.1-RELEASE+and+Ports systat(1)], and [https://www.freebsd.org/cgi/man.cgi?query=netstat&sektion=1&apropos=0&manpath=FreeBSD+12.1-RELEASE+and+Ports netstat(1)]. | ||
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Some of the variables which cannot be modified during normal system operation can be initialized via [https://www.freebsd.org/cgi/man.cgi?query=loader&sektion=8&apropos=0&manpath=FreeBSD+12.1-RELEASE+and+Ports loader(8)] tunables. This can for example be done by setting them in [https://www.freebsd.org/cgi/man.cgi?query=loader.conf&sektion=5&apropos=0&manpath=FreeBSD+12.1-RELEASE+and+Ports loader.conf(5)]. Please refer to [https://www.freebsd.org/cgi/man.cgi?query=loader.conf&sektion=5&apropos=0&manpath=FreeBSD+12.1-RELEASE+and+Ports loader.conf(5)] for more information on which tunables are available and how to set them. | Some of the variables which cannot be modified during normal system operation can be initialized via [https://www.freebsd.org/cgi/man.cgi?query=loader&sektion=8&apropos=0&manpath=FreeBSD+12.1-RELEASE+and+Ports loader(8)] tunables. This can for example be done by setting them in [https://www.freebsd.org/cgi/man.cgi?query=loader.conf&sektion=5&apropos=0&manpath=FreeBSD+12.1-RELEASE+and+Ports loader.conf(5)]. Please refer to [https://www.freebsd.org/cgi/man.cgi?query=loader.conf&sektion=5&apropos=0&manpath=FreeBSD+12.1-RELEASE+and+Ports loader.conf(5)] for more information on which tunables are available and how to set them. | ||
− | + | ==Usage== | |
− | + | The following list is only an excerpt. | |
− | + | Use '''sysctl''' plus the following NAME | |
{|class="wikitable" style="width:96.5%;background:#FFFFFF; border:2px solid #008000;text-align:left;padding: 10px" | {|class="wikitable" style="width:96.5%;background:#FFFFFF; border:2px solid #008000;text-align:left;padding: 10px" | ||
|- | |- | ||
! scope="col" style="width: 100px;"|'''NAME''' | ! scope="col" style="width: 100px;"|'''NAME''' | ||
− | ! scope="col" style="width: 350px;"|''' | + | ! scope="col" style="width: 350px;"|'''Description''' |
|- | |- | ||
|kern.ostype||FreeBSD | |kern.ostype||FreeBSD | ||
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|kern.osrevision||199506 | |kern.osrevision||199506 | ||
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− | |kern.osreldate ||1201512 | + | |kern.osreldate ||1201512 <br/>You get the same result with the command: uname -U |
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|kern.version ||FreeBSD 12.1-STABLE GENERIC | |kern.version ||FreeBSD 12.1-STABLE GENERIC | ||
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|} | |} | ||
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[[Category:How To]] | [[Category:How To]] | ||
[[Category:Kernel]] | [[Category:Kernel]] |