centos6&7系统优化脚本——init.sh

alenas

#!/bin/sh

#---------------------------------------#
# description:          centos6/7系统优化脚本  #
# author:                 alenas                 #
# email:         532036495@qq.com       #
#---------------------------------------#

# 基础服务优化
grep -q '7.' /etc/redhat-release
if [ $? -ne 0 ]; then
Services=$(chkconfig --list | grep '0' | awk '{print $1}' | grep -Ev 'sshd|network|crond|syslog|ntpd')
for Service in $Services
do
    service $Service stop
    chkconfig --level 0123456 $Service off
done
else
Services=(atd avahi-daemon cups dmraid-activation firewalld irqbalance kdump mdmonitor postfix)
for Service in ${Services

}
do
    systemctl disable ${Service}
    systemctl stop ${Service}
done
systemctl enable rc-local
fi

# 内核参数调优
grep -q "net.ipv4.tcp_max_tw_buckets" /etc/sysctl.conf || cat >> /etc/sysctl.conf << EOF
#######################################
net.core.rmem_default = 262144
net.core.rmem_max = 16777216
net.core.wmem_default = 262144
net.core.wmem_max = 16777216
net.core.somaxconn = 262144
net.core.netdev_max_backlog = 262144
net.ipv4.tcp_max_orphans = 262144
net.ipv4.tcp_max_syn_backlog = 262144
net.ipv4.tcp_max_tw_buckets = 10000
net.ipv4.ip_local_port_range = 1024 65500
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_synack_retries = 1
net.ipv4.tcp_syn_retries = 1
net.ipv4.tcp_fin_timeout = 30
net.ipv4.tcp_keepalive_time = 1200
net.ipv4.tcp_mem = 786432 1048576 1572864
fs.aio-max-nr = 1048576
fs.file-max = 6815744
kernel.sem = 250 32000 100 10000
kernel.pid_max = 65536
fs.inotify.max_user_watches = 1048576
kernel.kptr_restrict = 1
kernel.ctrl-alt-del = 1
vm.swappiness = 0
vm.overcommit_memory = 1
EOF
sysctl -p

#提高系统打开文件数、打开进程数限制，减小默认栈空间大小限制
grep -q "* soft nofile 60000" /etc/security/limits.conf || cat >> /etc/security/limits.conf << EOF
########################################
* soft nofile 60000
* hard nofile 65536
* soft nproc  2048
* hard nproc  16384
* soft stack  10240
* hard stack  32768
EOF

#提高Shell打开文件数、打开进程数限制，减小默认栈空间大小限制
grep -q "ulimit -Sn 60000" /etc/profile || cat >> /etc/profile << EOF
########################################
ulimit -Sn 60000
ulimit -Hn 65536
ulimit -Su 2048
ulimit -Hu 16384
ulimit -Ss 10240
ulimit -Hs 32768

alias grep='grep --color=auto'
export HISTTIMEFORMAT="%Y-%m-%d %H:%M:%S "
EOF

# 禁用并关闭selinux
sed -i 's/SELINUX=enforcing/SELINUX=disabled/' /etc/selinux/config
setenforce 0

# 优化SSH
sed -i 's/.*UseDNS yes/UseDNS no/' /etc/ssh/sshd_config
sed -i 's/.*GSSAPIAuthentication yes/GSSAPIAuthentication no/' /etc/ssh/sshd_config

grep -q '7.' /etc/redhat-release
if [ $? -ne 0 ]; then
        /etc/init.d/sshd restart
else
        systemctl restart sshd
fi


# 安装基础应用
yum -y --skip-broken install ntpdate screen wget rsync curl gcc vim-enhanced xz iftop sysstat dstat htop iotop lrzsz net-tools bash-completion

# 换repo源
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak
wget http://mirrors.aliyun.com/repo/epel.repo -O /etc/yum.repos.d/epel.repo

grep -q '7.' /etc/redhat-release
if [ $? -ne 0 ]; then       
        wget http://mirrors.aliyun.com/repo/Centos-6.repo -O /etc/yum.repos.d/CentOS-Base.repo
else
        wget http://mirrors.aliyun.com/repo/Centos-7.repo -O /etc/yum.repos.d/CentOS-Base.repo
fi

# 安装插件
#yum -y install python-simplejson libselinux-python

# 设置时间服务器
cat > /var/spool/cron/root << EOF
0  *  *  *  *  /usr/sbin/ntpdate time.windows.com &> /dev/null
#ntpdate time.windows.com &> /dev/null
EOF

liubulong

66666666666

kuba

666666666

kuba

6666666666

ld1978

谢谢分享。。。。。

strange

膜拜一下

strange

下的可以