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 Windows教程網 >> Linux系統教程 >> Linux教程 >> 如何設置Sysctl.conf用以提高Linux的性能(最完整的sysctl.conf優

如何設置Sysctl.conf用以提高Linux的性能(最完整的sysctl.conf優

日期:2017/2/7 14:34:21      編輯:Linux教程
 

Sysctl是一個允許您改變正在運行中的Linux系統的接口。它包含一些 TCP/IP 堆棧和虛擬內存系統的高級選項, 這可以讓有經驗的管理員提高引人注目的系統性能。用sysctl可以讀取設置超過五百個系統變量。基於這點,sysctl(8) 提供兩個功能:讀取和修改系統設置。

查看所有可讀變量:

% sysctl -a

讀一個指定的變量,例如 kern.maxproc:


% sysctl kern.maxproc kern.maxproc: 1044

要設置一個指定的變量,直接用 variable=value 這樣的語法:

# sysctl kern.maxfiles=5000

kern.maxfiles: 2088 -> 5000

您可以使用sysctl修改系統變量,也可以通過編輯sysctl.conf文件來修改系統變量。sysctl.conf 看起來很像 rc.conf。它用 variable=value 的形式來設定值。指定的值在系統進入多用戶模式之後被設定。並不是所有的變量都可以在這個模式下設定。

sysctl 變量的設置通常是字符串、數字或者布爾型。 (布爾型用 1 來表示’yes’,用 0 來表示’no’)。

sysctl -w kernel.sysrq=0

sysctl -w kernel.core_uses_pid=1

sysctl -w net.ipv4.conf.default.accept_redirects=0

sysctl -w net.ipv4.conf.default.accept_source_route=0

sysctl -w net.ipv4.conf.default.rp_filter=1

sysctl -w net.ipv4.tcp_syncookies=1

sysctl -w net.ipv4.tcp_max_syn_backlog=2048

sysctl -w net.ipv4.tcp_fin_timeout=30

sysctl -w net.ipv4.tcp_synack_retries=2

sysctl -w net.ipv4.tcp_keepalive_time=3600

sysctl -w net.ipv4.tcp_window_scaling=1

sysctl -w net.ipv4.tcp_sack=1

配置sysctl

編輯此文件:

vi /etc/sysctl.conf

如果該文件為空,則輸入以下內容,否則請根據情況自己做調整:

# Controls source route verification

# Default should work for all interfaces

net.ipv4.conf.default.rp_filter = 1

# net.ipv4.conf.all.rp_filter = 1

# net.ipv4.conf.lo.rp_filter = 1

# net.ipv4.conf.eth0.rp_filter = 1

# Disables IP source routing

# Default should work for all interfaces

net.ipv4.conf.default.accept_source_route = 0

# net.ipv4.conf.all.accept_source_route = 0

# net.ipv4.conf.lo.accept_source_route = 0

# net.ipv4.conf.eth0.accept_source_route = 0

# Controls the System Request debugging functionality of the kernel

kernel.sysrq = 0

# Controls whether core dumps will append the PID to the core filename.

# Useful for debugging multi-threaded applications.

kernel.core_uses_pid = 1

# Increase maximum amount of memory allocated to shm

# Only uncomment if needed!

# kernel.shmmax = 67108864

# Disable ICMP Redirect Acceptance

# Default should work for all interfaces

net.ipv4.conf.default.accept_redirects = 0

# net.ipv4.conf.all.accept_redirects = 0

# net.ipv4.conf.lo.accept_redirects = 0

# net.ipv4.conf.eth0.accept_redirects = 0

# Enable Log Spoofed Packets, Source Routed Packets, Redirect Packets

# Default should work for all interfaces

net.ipv4.conf.default.log_martians = 1

# net.ipv4.conf.all.log_martians = 1

# net.ipv4.conf.lo.log_martians = 1

# net.ipv4.conf.eth0.log_martians = 1

# Decrease the time default value for tcp_fin_timeout connection

net.ipv4.tcp_fin_timeout = 25

# Decrease the time default value for tcp_keepalive_time connection

net.ipv4.tcp_keepalive_time = 1200

# Turn on the tcp_window_scaling

net.ipv4.tcp_window_scaling = 1

# Turn on the tcp_sack

net.ipv4.tcp_sack = 1

# tcp_fack should be on because of sack

net.ipv4.tcp_fack = 1

# Turn on the tcp_timestamps

net.ipv4.tcp_timestamps = 1

# Enable TCP SYN Cookie Protection

net.ipv4.tcp_syncookies = 1

# Enable ignoring broadcasts request

net.ipv4.icmp_echo_ignore_broadcasts = 1

# Enable bad error message Protection

net.ipv4.icmp_ignore_bogus_error_responses = 1

# Make more local ports available

# net.ipv4.ip_local_port_range = 1024 65000

# Set TCP Re-Ordering value in kernel to ‘5′

net.ipv4.tcp_reordering = 5

# Lower syn retry rates

net.ipv4.tcp_synack_retries = 2

net.ipv4.tcp_syn_retries = 3

# Set Max SYN Backlog to ‘2048′

net.ipv4.tcp_max_syn_backlog = 2048

# Various Settings

net.core.netdev_max_backlog = 1024

# Increase the maximum number of skb-heads to be cached

net.core.hot_list_length = 256

# Increase the tcp-time-wait buckets pool size

net.ipv4.tcp_max_tw_buckets = 360000

# This will increase the amount of memory available for socket input/output queues

net.core.rmem_default = 65535

net.core.rmem_max = 8388608

net.ipv4.tcp_rmem = 4096 87380 8388608

net.core.wmem_default = 65535

net.core.wmem_max = 8388608

net.ipv4.tcp_wmem = 4096 65535 8388608

net.ipv4.tcp_mem = 8388608 8388608 8388608

net.core.optmem_max = 40960

如果希望屏蔽別人 ping 你的主機,則加入以下代碼:

# Disable ping requests

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