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系统优化脚本

centos7系统优化脚本​

#!/usr/bin/env bash
#

set -e

# 修改系统yum源为aliyun并添加epel源
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak
[ ! -e /etc/yum.repos.d/CentOS-Base.repo ] && curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo && sed -i -e '/mirrors.cloud.aliyuncs.com/d' -e '/mirrors.aliyuncs.com/d' /etc/yum.repos.d/CentOS-Base.repo

[ ! -e /etc/yum.repos.d/epel.repo ] && curl -o /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
yum makecache
yum -y install ntpdate tar wget net-tools git vim tree lrzsz htop iftop iotop psmisc python36 python3-devel zlib zlib-devel gcc gcc-c++ conntrack-tools jq socat bash-completion telnet nload strace tcpdump lsof sysstat

# 关闭swap
sed -i 's/.*swap.*/#&/' /etc/fstab

# 关闭防火墙、selinux、NetworkManager
systemctl disable firewalld NetworkManager
sed -i '7s/enforcing/disabled/' /etc/selinux/config

# 同步时间计划任务
echo "*/10 * * * * /usr/sbin/ntpdate ntp2.aliyun.com &>/dev/null" >> /var/spool/cron/root

# 历史命令显示时间
sed -i '/HISTFILESIZE=2000/d' /etc/bashrc
sed -i '/HISTSIZE=2000/d' /etc/bashrc
sed -i '/HISTTIMEFORMAT="%Y-%m-%d %H:%M:%S "/d' /etc/bashrc
sed -i '/export HISTTIMEFORMAT/d' /etc/bashrc
cat >> /etc/bashrc << EOF
HISTFILESIZE=2000
HISTSIZE=2000
HISTTIMEFORMAT="%Y-%m-%d %H:%M:%S "
export HISTTIMEFORMAT
EOF
source /etc/bashrc

# 修改系统最大文件描述符
sed -i '/root soft nofile 65535/d' /etc/security/limits.conf
sed -i '/root hard nofile 65535/d' /etc/security/limits.conf
sed -i '/* soft nofile 65535/d' /etc/security/limits.conf
sed -i '/* hard nofile 65535/d' /etc/security/limits.conf
cat >>/etc/security/limits.conf<<'EOF'
root soft nofile 65535
root hard nofile 65535
* soft nofile 65535
* hard nofile 65535
EOF

# 设置pip国内源
[ -d ~/.pip ] || mkdir ~/.pip
cat > ~/.pip/pip.conf << EOF
[global]
index-url = https://mirrors.aliyun.com/pypi/simple/

[install]
trusted-host=mirrors.aliyun.com
EOF

# 安装 glances mycli 
pip3 install --upgrade pip
pip3 install glances mycli==1.24.0

# 设置别名
cat >> ~/.bashrc << EOF
alias n='netstat -ntpl'
alias u='netstat -nupl'
alias a='netstat -natupl'
EOF

# 重启系统使部分配置生效
reboot