- # sysctl settings are defined through files in
- # /usr/lib/sysctl.d/, /run/sysctl.d/, and /etc/sysctl.d/.
- #
- # Vendors settings live in /usr/lib/sysctl.d/.
- # To override a whole file, create a new file with the same in
- # /etc/sysctl.d/ and put new settings there. To override
- # only specific settings, add a file with a lexically later
- # name in /etc/sysctl.d/ and put new settings there.
- #
- # For more information, see sysctl.conf(5) and sysctl.d(5).
- # 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
- vm.max_map_count = 655360
- fs.file-max=655350
来源: http://www.bubuko.com/infodetail-2730239.html