linux系统优化配置

时间 2019-11-11

标签 linux 系统优化配置栏目 Linux 繁體版

原文原文链接

# 2 millions system-wide
sysctl -w fs.file-max=2097152 sysctl -w fs.nr_open=2097152 echo 2097152 > /proc/sys/fs/nr_open

ulimit -n 1048576
ulimit -u 12000

/etc/sysctl.conf

持久化 ‘fs.file-max’ 设置到 /etc/sysctl.conf 文件:网络

 
   fs.file-max = 1048576  
  

/etc/systemd/system.conf 设置服务最大文件句柄数:并发

 
   DefaultLimitNOFILE=1048576  
  

/etc/security/limits.conf

/etc/security/limits.conf 持久化设置容许用户/进程打开文件句柄数:tcp

*      soft nofile 1048576 * hard nofile 1048576
* soft nproc 12000
* hard nproc 12000

TCP 协议栈网络参数

并发链接 backlog 设置:ide

 
     sysctl -w net.core.somaxconn=32768 sysctl -w net.ipv4.tcp_max_syn_backlog=16384 sysctl -w net.core.netdev_max_backlog=16384  
    

可用知名端口范围:spa

 
     sysctl -w net.ipv4.ip_local_port_range='1000 65535'  
    

TCP Socket 读写 Buffer 设置:进程

 
     sysctl -w net.core.rmem_default=262144 sysctl -w net.core.wmem_default=262144 sysctl -w net.core.rmem_max=16777216 sysctl -w net.core.wmem_max=16777216 sysctl -w net.core.optmem_max=16777216 #sysctl -w net.ipv4.tcp_mem='16777216 16777216 16777216' sysctl -w net.ipv4.tcp_rmem='1024 4096 16777216' sysctl -w net.ipv4.tcp_wmem='1024 4096 16777216'  
    

TCP 链接追踪设置:ip

 
     sysctl -w net.nf_conntrack_max=1000000 sysctl -w net.netfilter.nf_conntrack_max=1000000 sysctl -w net.netfilter.nf_conntrack_tcp_timeout_time_wait=30  
    

TIME-WAIT Socket 最大数量、回收与重用设置:it

 
     net.ipv4.tcp_max_tw_buckets=1048576 # 注意: 不建议开启該设置，NAT模式下可能引发链接RST # net.ipv4.tcp_tw_recycle = 1 # net.ipv4.tcp_tw_reuse = 1  
    

FIN-WAIT-2 Socket 超时设置:io

 
     net.ipv4.tcp_fin_timeout = 15 
    