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  2. 521xueweihan created this gist Sep 25, 2018.
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    1、`vim /etc/sysctl.conf`

    2、末尾追加如上设置
    ```
    # 提高整个系统的文件限制
    # max open files
    fs.file-max = 51200

    # max read buffer
    net.core.rmem_max = 67108864
    # max write buffer
    net.core.wmem_max = 67108864
    # default read buffer
    net.core.rmem_default = 65536
    # default write buffer
    net.core.wmem_default = 65536
    # max processor input queue
    net.core.netdev_max_backlog = 4096
    # max backlog
    net.core.somaxconn = 4096

    # resist SYN flood attacks
    # 表示开启SYN Cookies。当出现SYN等待队列溢出时,启用cookies来处理,可防范少量SYN攻击,默认为0,表示关闭;
    net.ipv4.tcp_syncookies = 1
    # reuse timewait sockets when safe
    # 表示开启重用。允许将TIME-WAIT sockets重新用于新的TCP连接,默认为0,表示关闭;
    net.ipv4.tcp_tw_reuse = 1
    # turn off fast timewait sockets recycling
    # 表示开启TCP连接中TIME-WAIT sockets的快速回收,默认为0,表示关闭;
    net.ipv4.tcp_tw_recycle = 1
    # short FIN timeout
    # 修改系統默认的 TIMEOUT 时间。
    net.ipv4.tcp_fin_timeout = 30
    # short keepalive time
    # 表示当keepalive起用的时候,TCP发送keepalive消息的频度。缺省是2小时,改为20分钟。
    net.ipv4.tcp_keepalive_time = 1200
    # outbound port range
    # 表示用于向外连接的端口范围。缺省情况下很小:32768到61000,改为10000到65000。(注意:这里不要将最低值设的太低,否则可能会占用掉正常的端口!)
    net.ipv4.ip_local_port_range = 10000 65000
    # max SYN backlog
    # 表示SYN队列的长度,默认为1024,加大队列长度为8192,可以容纳更多等待连接的网络连接数。
    net.ipv4.tcp_max_syn_backlog = 4096
    # max timewait sockets held by system simultaneously
    # 表示系统同时保持TIME_WAIT的最大数量,如果超过这个数字,TIME_WAIT将立刻被清除并打印警告信息。
    net.ipv4.tcp_max_tw_buckets = 5000

    # TCP receive buffer
    net.ipv4.tcp_rmem = 4096 87380 67108864
    # TCP write buffer
    net.ipv4.tcp_wmem = 4096 65536 67108864
    # turn on path MTU discovery
    net.ipv4.tcp_mtu_probing = 1

    # turn on TCP Fast Open on both client and server side
    # 对于内核版本新于**3.7.1**的,我们可以开启tcp_fastopen:
    # net.ipv4.tcp_fastopen = 3

    # for high-latency network
    # net.ipv4.tcp_congestion_control = hybla

    # for low-latency network, use htcp instead
    net.ipv4.tcp_congestion_control = htcp
    ```

    3、`sysctl --system` 加载新的配置