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  • CentOS 7 内核优化

     

    [root@DaMoWang ~]# vim /etc/sysctl.conf 
    #关闭ipv6
    net.ipv6.conf.all.disable_ipv6 = 1
    net.ipv6.conf.default.disable_ipv6 = 1
    
    # 避免放大攻击
    net.ipv4.icmp_echo_ignore_broadcasts = 1
    
    # 开启恶意icmp错误消息保护
    net.ipv4.icmp_ignore_bogus_error_responses = 1
    
    #关闭路由转发
    net.ipv4.ip_forward = 0
    net.ipv4.conf.all.send_redirects = 0
    net.ipv4.conf.default.send_redirects = 0
    
    #开启反向路径过滤
    net.ipv4.conf.all.rp_filter = 1
    net.ipv4.conf.default.rp_filter = 1
    
    #处理无源路由的包
    net.ipv4.conf.all.accept_source_route = 0
    net.ipv4.conf.default.accept_source_route = 0
    
    #关闭sysrq功能
    kernel.sysrq = 0
    
    #core文件名中添加pid作为扩展名
    kernel.core_uses_pid = 1
    
    # 开启SYN洪水攻击保护
    net.ipv4.tcp_syncookies = 1
    
    #修改消息队列长度
    kernel.msgmnb = 65536
    kernel.msgmax = 65536
    
    #设置最大内存共享段大小bytes
    kernel.shmmax = 68719476736
    kernel.shmall = 4294967296
    
    #timewait的数量,默认180000
    net.ipv4.tcp_max_tw_buckets = 6000
    net.ipv4.tcp_sack = 1
    net.ipv4.tcp_window_scaling = 1
    net.ipv4.tcp_rmem = 4096        87380   4194304
    net.ipv4.tcp_wmem = 4096        16384   4194304
    net.core.wmem_default = 8388608
    net.core.rmem_default = 8388608
    net.core.rmem_max = 16777216
    net.core.wmem_max = 16777216
    
    #每个网络接口接收数据包的速率比内核处理这些包的速率快时,允许送到队列的数据包的最大数目
    net.core.netdev_max_backlog = 262144
    
    #限制仅仅是为了防止简单的DoS 攻击
    net.ipv4.tcp_max_orphans = 3276800
    
    #未收到客户端确认信息的连接请求的最大值
    net.ipv4.tcp_max_syn_backlog = 262144
    net.ipv4.tcp_timestamps = 0
    
    #内核放弃建立连接之前发送SYNACK 包的数量
    net.ipv4.tcp_synack_retries = 1
    
    #内核放弃建立连接之前发送SYN 包的数量
    net.ipv4.tcp_syn_retries = 1
    
    #启用timewait 快速回收
    net.ipv4.tcp_tw_recycle = 1
    
    #开启重用。允许将TIME-WAIT sockets 重新用于新的TCP 连接
    net.ipv4.tcp_tw_reuse = 1
    net.ipv4.tcp_mem = 94500000 915000000 927000000
    net.ipv4.tcp_fin_timeout = 1
    
    #当keepalive 起用的时候,TCP 发送keepalive 消息的频度。缺省是2 小时
    net.ipv4.tcp_keepalive_time = 30
    
    #允许系统打开的端口范围
    net.ipv4.ip_local_port_range = 1024    65000
    
    #修改防火墙表大小,默认65536
    #net.netfilter.nf_conntrack_max=655350
    #net.netfilter.nf_conntrack_tcp_timeout_established=1200
    
    # 确保无人能修改路由表
    net.ipv4.conf.all.accept_redirects = 0
    net.ipv4.conf.default.accept_redirects = 0
    net.ipv4.conf.all.secure_redirects = 0
    net.ipv4.conf.default.secure_redirects = 0

    使其生效

    [root@DaMoWang ~]# sysctl -p
    sysctl: /etc/sysctl.conf(11): invalid syntax, continuing...
    net.ipv6.conf.all.disable_ipv6 = 1
    net.ipv6.conf.default.disable_ipv6 = 1
    net.ipv4.icmp_echo_ignore_broadcasts = 1
    net.ipv4.icmp_ignore_bogus_error_responses = 1
    net.ipv4.ip_forward = 0
    net.ipv4.conf.all.send_redirects = 0
    net.ipv4.conf.default.send_redirects = 0
    net.ipv4.conf.all.rp_filter = 1
    net.ipv4.conf.default.rp_filter = 1
    net.ipv4.conf.all.accept_source_route = 0
    net.ipv4.conf.default.accept_source_route = 0
    kernel.sysrq = 0
    kernel.core_uses_pid = 1
    net.ipv4.tcp_syncookies = 1
    kernel.msgmnb = 65536
    kernel.msgmax = 65536
    kernel.shmmax = 68719476736
    kernel.shmall = 4294967296
    net.ipv4.tcp_max_tw_buckets = 6000
    net.ipv4.tcp_sack = 1
    net.ipv4.tcp_window_scaling = 1
    net.ipv4.tcp_rmem = 4096        87380   4194304
    net.ipv4.tcp_wmem = 4096        16384   4194304
    net.core.wmem_default = 8388608
    net.core.rmem_default = 8388608
    net.core.rmem_max = 16777216
    net.core.wmem_max = 16777216
    net.core.netdev_max_backlog = 262144
    net.ipv4.tcp_max_orphans = 3276800
    net.ipv4.tcp_max_syn_backlog = 262144
    net.ipv4.tcp_timestamps = 0
    net.ipv4.tcp_synack_retries = 1
    net.ipv4.tcp_syn_retries = 1
    net.ipv4.tcp_tw_recycle = 1
    net.ipv4.tcp_tw_reuse = 1
    net.ipv4.tcp_mem = 94500000 915000000 927000000
    net.ipv4.tcp_fin_timeout = 1
    net.ipv4.tcp_keepalive_time = 30
    net.ipv4.ip_local_port_range = 1024    65000
    net.ipv4.conf.all.accept_redirects = 0
    net.ipv4.conf.default.accept_redirects = 0
    net.ipv4.conf.all.secure_redirects = 0
    net.ipv4.conf.default.secure_redirects = 0
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  • 原文地址:https://www.cnblogs.com/bigdevilking/p/9497373.html
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