通用linux接口服务器参数调优

1. 如果需要支撑百万级同时在线数，需要对linux默认内核参数进行调整，我们的典型配置是在
/etc/sysctl.conf增加以下内容：
    net.ipv4.tcp_max_syn_backlog = 120000
    net.core.netdev_max_backlog = 120000
    net.core.somaxconn = 12000
    net.ipv4.tcp_fin_timeout = 2
    net.ipv4.tcp_tw_reuse = 1
    net.ipv4.tcp_tw_recycle = 1
    net.ipv4.tcp_max_tw_buckets = 1000
    net.ipv4.tcp_abort_on_overflow = 1
    net.ipv4.tcp_sack = 1
    net.ipv4.tcp_rmem = 4096 8192 32768
    net.ipv4.tcp_wmem = 4096 8192 32768
    net.core.optmem_max = 8192
    net.ipv4.tcp_timestamps = 0
    net.ipv4.tcp_mem = 3075840  4101120  12303360
    net.ipv4.tcp_keepalive_time = 30
    net.ipv4.tcp_keepalive_probes = 5
    net.ipv4.tcp_keepalive_intvl = 15
    net.netfilter.nf_conntrack_tcp_timeout_last_ack = 3
    net.ipv4.tcp_synack_retries = 1
    net.ipv4.tcp_syn_retries = 1
    net.ipv4.ip_local_port_range = 1024     65535
    net.nf_conntrack_max = 6553600
    net.netfilter.nf_conntrack_max = 6553500
    net.netfilter.nf_conntrack_tcp_timeout_established = 180
    修改/etc/security/limits.conf配置:
    *               soft    nofile          1200000
    *               hard    nofile          1200000

通用linux接口服务器参数调优

原文：http://blog.csdn.net/zhangjianying/article/details/49678401