Difference between revisions of "Sysctl (command)"
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↑ https://github.com/prometheus/node_exporter
↑ https://github.com/moby/moby/pull/37701
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{{lowercase}} | {{lowercase}} | ||
| − | + | <code>sysctl</code> configure kernel parameters at runtime. | |
| − | * | + | * https://man7.org/linux/man-pages/man8/sysctl.8.html |
| − | * <code>sysctl vm.[[swappiness]]</code> | + | * <code>sysctl -a, --all</code> Display all values currently available. |
| + | * <code>[[sysctl -p]]</code> Load in sysctl settings. | ||
| + | * <code>[[/etc/sysctl.d/]]</code> | ||
| + | * <code>[[/etc/sysctl.conf]]</code> | ||
| + | |||
| + | |||
| + | * <code>sysctl [[vm.]][[swappiness]]</code> | ||
| + | [[sysctl -w]] vm.[[nr_hugepages]] = 204832 | ||
| + | sysctl -w vm.[[max_map_count]]=262144 | ||
| Line 13: | Line 21: | ||
| − | + | * <code>sysctl -w kernel.perf_event_paranoid=X ([[node exporter]] <ref>https://github.com/prometheus/node_exporter</ref>)</code> | |
| Line 21: | Line 29: | ||
* <code>[[sysctl]] -q net.ipv4.conf.all.src_valid_mark=1</code> | * <code>[[sysctl]] -q net.ipv4.conf.all.src_valid_mark=1</code> | ||
| + | |||
| + | * <code>[[sysctl -w]] vm.[[max_map_count]]=262144</code> | ||
| Line 26: | Line 36: | ||
* <code>net.ipv4.tcp_[[mtu]]_probing</code> ([[SSH2_MSG_KEX_ECDH_REPLY]]) | * <code>net.ipv4.tcp_[[mtu]]_probing</code> ([[SSH2_MSG_KEX_ECDH_REPLY]]) | ||
| + | |||
| + | * <code>[[sysctl -w fs.file-max]]=100000</code> | ||
| + | |||
| + | * <code>sysctl -w [[vm.]]nr_hugepages = 204832</code> | ||
== Related terms == | == Related terms == | ||
* [[Docker]] added support for <code>sysctl</code> options in [[docker services]]<ref>https://github.com/moby/moby/pull/37701</ref> in docker (2019-07-22) | * [[Docker]] added support for <code>sysctl</code> options in [[docker services]]<ref>https://github.com/moby/moby/pull/37701</ref> in docker (2019-07-22) | ||
* [[Tunning]] | * [[Tunning]] | ||
| + | * <code>[[sysctl]] fs.file-max</code> | ||
| + | * [[K8s 1.21]] (April 2021) added support for sysctl | ||
| + | * [[Redis values.yml]]: sysctl.enabled: false | ||
| + | * [[prlimit]] | ||
== See also == | == See also == | ||
* {{sysctl}} | * {{sysctl}} | ||
| − | |||
| − | |||
* {{Linux Kernel}} | * {{Linux Kernel}} | ||
[[Category:Linux commands]] | [[Category:Linux commands]] | ||
Latest revision as of 11:48, 24 January 2024
sysctl configure kernel parameters at runtime.
sysctl -a, --allDisplay all values currently available.sysctl -pLoad in sysctl settings./etc/sysctl.d//etc/sysctl.conf
sysctl vm.swappiness
sysctl -w vm.nr_hugepages = 204832 sysctl -w vm.max_map_count=262144
iptables -t nat -A PREROUTING -i eno1 -p tcp --dport 5900 -j DNAT --to 127.0.0.1:5900 sysctl -w net.ipv4.ip_forward=1 sysctl -p /etc/sysctl.conf
sysctl -w kernel.perf_event_paranoid=X (node exporter [1])
sysctl -w net.ipv4.ip_forward=1sysctl -w net.ipv6.conf.all.forwarding=1
sysctl -q net.ipv4.conf.all.src_valid_mark=1
sysctl -w vm.max_map_count=262144
net.ipv4.tcp_mtu_probing(SSH2_MSG_KEX_ECDH_REPLY)
sysctl -w fs.file-max=100000
sysctl -w vm.nr_hugepages = 204832
Related terms[edit]
- Docker added support for
sysctloptions in docker services[2] in docker (2019-07-22) - Tunning
sysctl fs.file-max- K8s 1.21 (April 2021) added support for sysctl
- Redis values.yml: sysctl.enabled: false
- prlimit
See also[edit]
sysctl, -a, -p, -w,vm.swappiness,/etc/sysctl.conf,/etc/sysctl.d/,net.ipv4.ip_forward, OOM,Kernel.shmmax,prlimit- Linux Kernel: namespaces, Cgroups, OOM, proc, Linux Kernel changelog,
sysctl, userfaultfd, Grub, ENOSPC, ENOMEM, DKMS, syscall, Transparent huge pages, smatch, sysfs, vm.swappiness, CFS, Runlevel, Jens Axboe, Consistent Network Device Naming, Initial ramdisk (initrd),modprobe, MTD, Linux Kernel vulnerabilities,/sys/kernel/, KernelCare,unix://, Data Plane Development Kit (DPDK)
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