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Linux Kernel Parameter Tuning
1.
Linux Kernel Parameter Tuning
2.
Linux Kernel Operating System
OS Kernel CPU Mem GPU NIC Keybo ard
3.
Kernel Parameter Kernel OS
Kernel Linux
4.
Kernel Parameter Linux Kernel
5.
Kernel Parameter Tuning
6.
Kernel Parameter Tuning
7.
/ IPv6 CentOS7 Windows
8.
VM /
9.
Kernel Parameter /proc echo 100
> /proc/sys/net/ipv4/tcp_keepalive_time sysctl /etc/sysctl.conf sysctl sysctl RHEL systemctl disable tuned.service
10.
sysctl 3 -a sysctl -a -w sysctl -w
net.ipv4.tcp_keepalive_time=100 -p sysctl.conf sysctl -p
11.
CPU Memory Storage,
Network Linux Kernel
12.
IT CPU IO (
) /
13.
Linux DNS NW
/ CentOS debian
14.
- - net.core.rmem_max =
16777216 TCP UDP net.core.wmem_max = 16777216 TCP UDP net.nf_conntrack_max = 1053616 ESTABLISHED (OS ) net.ipv4.tcp_rmem = 4096 349520 16777216 net.ipv4.tcp_timestamps = 0 NAT WAN net.ipv4.tcp_fin_timeout = 5 FIN net.ipv4.tcp_syn_retries = 3 tcp SYN SYN
15.
- - net.ipv4.tcp_synack_retries =
3 SYN ACK SYN net.ipv4.ip_local_port_range = 10000 65535 TCP/IP iptables $ cat /proc/sys/net/ipv4/ip_local_port_range net.ipv4.tcp_tw_reuse = 1 tcp_tw_recycle net.ipv4.tcp_tw_recycle = 0 * net.ipv4.tcp_rfc1337 = 1 RFC1337 TIME_WAIT RST TIME_WAIT
16.
- - net.ipv4.tcp_fin_timeout =
5 net.ipv4.tcp_max_tw_buckets = 65536 time-wait DoS net.ipv4.tcp_orphan_retries = 0 TCP web net.ipv4.tcp_window_scaling = 1 RFC1323 TCP 64KB TCP WIndow net.ipv4.tcp_slow_start_after_idle = 0 keepalive congestion window size reset keepalive off
17.
- - net.ipv4.tcp_keepalive_time =
10 CLOSE_WAIT TCP net.ipv4.tcp_keepalive_intvl = 3 TCP/IP net.ipv4.tcp_keepalive_probes = 5 TCP keepalive
18.
- - net.core.netdev_max_backlog =
10240 net.ipv4.tcp_max_syn_backlog = 10240 SYN ACK OS SYN netstat net.core.somaxconn net.core.somaxconn net.core.somaxconn = 65535 TCP TCP backlog
19.
- - net.ipv4.tcp_window_scaling =
1 RFC1323 TCP 64KB TCP WIndow net.ipv4.tcp_max_syn_backlog = 10240 SYN ACK OS SYN netstat net.core.somaxconn net.core.somaxconn net.core.somaxconn = 65535 TCP TCP backlog
20.
- - net.ipv4.conf.all.rp_filter =
1 IP net.ipv4.tcp_syncookies = 1 SYN flood net.ipv4.conf.all.log_martians = 1 net.ipv4.conf.default.accept_source_route = 0 off net.ipv4.conf.all.rp_filter = 1 RFC 3704 IF IF IP DDoS net.ipv4.conf.all.forwarding = 0 net.ipv4.conf.all.accept_redirects = 0 net.ipv4.conf.all.send_redirects = 0 net.ipv4.conf.all.secure_redirects = 0 net.ipv4.conf.all.mc_forwarding = 0 ICMP
21.
- - kernel.exec-shield =
1 kernel.randomize_va_space = 1 Exec-Shield ASLR
22.
- - vm.swappiness =
0 fs.file-max = 5242880 kernel.threads-max = 1060863 kernel.shmmax = kB kernel.shmall = 68719476736 kernel.msgmnb = 65536 1 kernel.msgmax = 65536 ID
23.
- - vm.overcommit_memory =
2 vm.overcommit_ratio = 99 vm.overcommit_memory = 2 /proc/[process_id]/oom_adj = -17 vm.panic_on_oom=1 OOM Killer Kernel Panic vm.overcommit_memory = 1 kernel.panic=60 Kernel Panic vm.overcommit_memory = 1
24.
- - vm.dirty_ratio =
20 | 80 vm.dirty_background_ratio = 5 | 50 : : IO
25.
Kernel Parameter Kernel
Version
26.
Red Hat Linux https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html- single/Performance_Tuning_Guide/index.html sysctl
man Linux Kernel doc https://www.kernel.org/doc/Documentation/
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