Sysctl (command)

• sysctl -a
• sysctl -p
• /etc/sysctl.d/
• /etc/sysctl.conf

• sysctl vm.swappiness

KVM VNC remote viewer

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 )

• sysctl -w net.ipv4.ip_forward=1
• sysctl -w net.ipv6.conf.all.forwarding=1

• sysctl -q net.ipv4.conf.all.src_valid_mark=1

sysctl -w vm.max_map_count=262144

• macOS: sysctl machdep.cpu.features

• net.ipv4.tcp_mtu_probing (SSH2_MSG_KEX_ECDH_REPLY)

sysctl -w fs.file-max=100000

Related terms

• Docker added support for sysctl options in docker services in docker (2019-07-22)
• Tunning
• sysctl fs.file-max
• K8s 1.21 (April 2021) added support for sysctl

See also

• sysctl, -a, -p, -w, vm.swappiness, /etc/sysctl.conf, /etc/sysctl.d/, net.ipv4.ip_forward, OOM, Kernel.shmmax, prlimit
• procps: Proc, sysctl, slabtop, /etc/timezone
• Process, zombie process, fork, thread: ps, tree, pstree, ps axf, proc, pwdx, which, watch, sar -q, tload, uptime, Interrupts, pgrep, tasklist (Windows), Zombie process, pstack, docker ps, docker-compose ps, jobs, acct, process mrelease, pidstat, IPC, pidof
• 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)

https://github.com/prometheus/node_exporter

https://github.com/moby/moby/pull/37701