99 lines
3.3 KiB
Bash
99 lines
3.3 KiB
Bash
#!/bin/bash
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# centos7
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# 20161019
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# /etc/sysctl.conf
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cat >>/etc/sysctl.conf<<EOF
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#系统优化参数
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#关闭ipv6
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net.ipv6.conf.all.disable_ipv6 = 1
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net.ipv6.conf.default.disable_ipv6 = 1
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#决定检查过期多久邻居条目
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net.ipv4.neigh.default.gc_stale_time=120
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#使用arp_announce / arp_ignore解决ARP映射问题
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net.ipv4.conf.default.arp_announce = 2
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net.ipv4.conf.all.arp_announce=2
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net.ipv4.conf.lo.arp_announce=2
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# 避免放大攻击
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net.ipv4.icmp_echo_ignore_broadcasts = 1
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# 开启恶意icmp错误消息保护
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net.ipv4.icmp_ignore_bogus_error_responses = 1
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#关闭路由转发
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net.ipv4.ip_forward = 0
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net.ipv4.conf.all.send_redirects = 0
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net.ipv4.conf.default.send_redirects = 0
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#开启反向路径过滤
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net.ipv4.conf.all.rp_filter = 1
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net.ipv4.conf.default.rp_filter = 1
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#处理无源路由的包
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net.ipv4.conf.all.accept_source_route = 0
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net.ipv4.conf.default.accept_source_route = 0
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#关闭sysrq功能
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kernel.sysrq = 0
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#core文件名中添加pid作为扩展名
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kernel.core_uses_pid = 1
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# 开启SYN洪水攻击保护
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net.ipv4.tcp_syncookies = 1
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#修改消息队列长度
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kernel.msgmnb = 65536
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kernel.msgmax = 65536
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#设置最大内存共享段大小bytes
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kernel.shmmax = 68719476736
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kernel.shmall = 4294967296
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#timewait的数量，默认180000
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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 = 4096 87380 4194304
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net.ipv4.tcp_wmem = 4096 16384 4194304
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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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#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
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net.core.netdev_max_backlog = 262144
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#限制仅仅是为了防止简单的DoS 攻击
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net.ipv4.tcp_max_orphans = 3276800
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#未收到客户端确认信息的连接请求的最大值
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net.ipv4.tcp_max_syn_backlog = 262144
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net.ipv4.tcp_timestamps = 0
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#内核放弃建立连接之前发送SYNACK 包的数量
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net.ipv4.tcp_synack_retries = 1
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#内核放弃建立连接之前发送SYN 包的数量
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net.ipv4.tcp_syn_retries = 1
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#启用timewait 快速回收
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net.ipv4.tcp_tw_recycle = 1
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#开启重用。允许将TIME-WAIT sockets 重新用于新的TCP 连接
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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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#当keepalive 起用的时候，TCP 发送keepalive 消息的频度。缺省是2 小时
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net.ipv4.tcp_keepalive_time = 1800
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net.ipv4.tcp_keepalive_probes = 3
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net.ipv4.tcp_keepalive_intvl = 15
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#允许系统打开的端口范围
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net.ipv4.ip_local_port_range = 1024 65000
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#修改防火墙表大小，默认65536
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net.netfilter.nf_conntrack_max=655350
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net.netfilter.nf_conntrack_tcp_timeout_established=1200
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# 确保无人能修改路由表
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net.ipv4.conf.all.accept_redirects = 0
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net.ipv4.conf.default.accept_redirects = 0
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net.ipv4.conf.all.secure_redirects = 0
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net.ipv4.conf.default.secure_redirects = 0
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vm.swappiness = 10
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kernel.panic = 5
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fs.file-max = 165535
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# for high-latency network
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net.ipv4.tcp_congestion_control = hybla
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#maximize the available memory
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vm.overcommit_memory = 1
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vm.dirty_ratio = 1
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vm.swappiness = 10
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vm.vfs_cache_pressure = 110
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#vm.zone_reclaim_mode = 0
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#keep the IO performance steady
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vm.dirty_background_ratio = 1
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vm.dirty_writeback_centisecs = 100
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vm.dirty_expire_centisecs = 100
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EOF |