linux系统内核优化参数

zhangkai

1. 系统连接数优化

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  # vim /etc/security/limits.conf
  
  
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  *      soft    nofile      65535
  
  
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  *      hard    nofile      65535
  
  
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  *      soft    noproc      65535
  
  
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  *      hard    noproc      65535
  
  
  

退出重新登陆生效

2. 内核优化

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  # vim /etc/sysctl.conf
  
  
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  fs.file-max = 999999
  
  
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  net.ipv4.ip_forward = 0
  
  
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  net.ipv4.conf.default.rp_filter = 1
  
  
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  net.ipv4.conf.default.accept_source_route = 0
  
  
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  kernel.sysrq = 0
  
  
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  kernel.core_uses_pid = 1
  
  
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  net.ipv4.tcp_syncookies = 1
  
  
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  kernel.msgmnb = 65536
  
  
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  kernel.msgmax = 65536
  
  
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  kernel.shmmax = 68719476736
  
  
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  kernel.shmall = 4294967296
  
  
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  net.ipv4.tcp_max_tw_buckets = 6000
  
  
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  net.ipv4.tcp_sack = 1
  
  
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  net.ipv4.tcp_window_scaling = 1
  
  
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  net.ipv4.tcp_rmem = 10240 87380 12582912
  
  
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  net.ipv4.tcp_wmem = 10240 87380 12582912
  
  
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  net.core.wmem_default = 8388608
  
  
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  net.core.rmem_default = 8388608
  
  
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  net.core.rmem_max = 16777216
  
  
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  net.core.wmem_max = 16777216
  
  
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  net.core.netdev_max_backlog = 262144
  
  
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  net.core.somaxconn = 40960
  
  
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  net.ipv4.tcp_max_orphans = 3276800
  
  
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  net.ipv4.tcp_max_syn_backlog = 262144
  
  
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  net.ipv4.tcp_timestamps = 0
  
  
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  net.ipv4.tcp_synack_retries = 1
  
  
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  net.ipv4.tcp_syn_retries = 1
  
  
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  net.ipv4.tcp_tw_recycle = 1
  
  
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  net.ipv4.tcp_tw_reuse = 1
  
  
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  net.ipv4.tcp_mem = 94500000 915000000 927000000
  
  
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  net.ipv4.tcp_fin_timeout = 1
  
  
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  net.ipv4.tcp_keepalive_time = 30
  
  
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  net.ipv4.ip_local_port_range = 1024 65000
  
  
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  # 生效:sysctl -p