centos7優化核心引數詳解

2021-08-21 06:17:41 字數 2552 閱讀 4476

centos7優化核心引數詳解

原文:cat /etc/sysctl.conf

#ctcdn系統優化引數

#關閉ipv6

net.ipv6.conf.all.disable_ipv6 = 1

net.ipv6.conf.default.disable_ipv6 = 1

# 避免放大攻擊

net.ipv4.icmp_echo_ignore_broadcasts = 1

# 開啟惡意icmp錯誤訊息保護

net.ipv4.icmp_ignore_bogus_error_responses = 1

#關閉路由**

net.ipv4.ip_forward = 0

net.ipv4.conf.all.send_redirects = 0

net.ipv4.conf.default.send_redirects = 0

#開啟反向路徑過濾

net.ipv4.conf.all.rp_filter = 1

net.ipv4.conf.default.rp_filter = 1

#處理無源路由的包

net.ipv4.conf.all.accept_source_route = 0

net.ipv4.conf.default.accept_source_route = 0

#關閉sysrq功能

kernel.sysrq = 0

#core檔名中新增pid作為副檔名

kernel.core_uses_pid = 1

# 開啟syn洪水攻擊保護

net.ipv4.tcp_syncookies = 1

#修改訊息佇列長度

kernel.msgmnb = 65536

kernel.msgmax = 65536

#設定最大記憶體共享段大小bytes

kernel.shmmax = 68719476736

kernel.shmall = 4294967296

#timewait的數量,預設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

#每個網路介面接收資料報的速率比核心處理這些包的速率快時,允許送到佇列的資料報的最大數目

net.core.netdev_max_backlog = 262144

#限制僅僅是為了防止簡單的dos 攻擊

net.ipv4.tcp_max_orphans = 3276800

#未收到客戶端確認資訊的連線請求的最大值

net.ipv4.tcp_max_syn_backlog = 262144

net.ipv4.tcp_timestamps = 0

#核心放棄建立連線之前傳送synack 包的數量

net.ipv4.tcp_synack_retries = 1

#核心放棄建立連線之前傳送syn 包的數量

net.ipv4.tcp_syn_retries = 1

#啟用timewait 快速**

net.ipv4.tcp_tw_recycle = 1

#開啟重用。允許將time-wait sockets 重新用於新的tcp 連線

net.ipv4.tcp_tw_reuse = 1

net.ipv4.tcp_mem = 94500000 915000000 927000000

net.ipv4.tcp_fin_timeout = 1

#當keepalive 起用的時候,tcp 傳送keepalive 訊息的頻度。預設是2 小時

net.ipv4.tcp_keepalive_time = 30

#允許系統開啟的埠範圍

net.ipv4.ip_local_port_range = 1024    65000

#修改防火牆表大小,預設65536

#net.netfilter.nf_conntrack_max=655350

#net.netfilter.nf_conntrack_tcp_timeout_established=1200

# 確保無人能修改路由表

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

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