• centos7.5优化系统脚本(虚拟机下)


    #!/usr/bin/bash
    
    #安装常用软件,首先必须自行调整好网卡配置文件,保证可以上网,否则,下列优化会失败
    yum -y install wget vim lrzsz bash-completion dos2unix telnet tree net-tools namp sl nc psmisc ntpdate sysstat
    
    #替换yum源,安装epel源
    wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
    wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
    yum clean all && yum makecache
    
    #关闭防火墙和selinux
    systemctl stop firewalld.service
    systemctl disable firewalld.service
    sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config
    setenforce 0
    
    #设置时间同步
    echo "#time update by root" >>/var/spool/cron/root
    echo "*/5 * * * * /usr/sbin/ntpdate ntp1.aliyun.com &>/dev/null" >>/var/spool/cron/root
    
    #优化ssh链接(这里没有优化禁止root远程登录)
    cp /etc/ssh/sshd_config /etc/ssh/sshd_config.$(date +%F).bak
    sed -i 's/^GSSAPIAuthentication yes$/GSSAPIAuthentication no/' /etc/ssh/sshd_config
    sed -i 's/#UseDNS yes/UseDNS no/' /etc/ssh/sshd_config
    sed -i 's%#PermitEmptyPasswords no%PermitEmptyPasswords no%' /etc/ssh/sshd_config
    systemctl restart sshd.service
    
    #设置字符集为zh_CN.UTF-8
    localectl set-locale LANG=zh_CN.UTF-8
    source /etc/locale.conf
    
    #加大linux文件描述符
    echo '*  -   nofile   65535' >>/etc/security/limits.conf
    
    #更改网卡名称为eth0,配置主机IP地址和DNS(根据自己需求改一下地址即可)
    mv /etc/sysconfig/network-scripts/ifcfg-ens32 /etc/sysconfig/network-scripts/ifcfg-ens32.bak
    cat > /etc/sysconfig/network-scripts/ifcfg-eth0 << EOF
    TYPE=Ethernet
    BOOTPROTO=static
    DEFROUTE=yes
    IPV4_FAILURE_FATAL=no
    IPV6INIT=yes
    IPV6_AUTOCONF=yes
    IPV6_DEFROUTE=yes
    IPV6_FAILURE_FATAL=no
    NAME=eth0
    DEVICE=eth0
    ONBOOT=yes
    PREFIX=24
    IPV6_PEERDNS=yes
    IPV6_PEERROUTES=yes
    IPV6_PRIVACY=no
    IPADDR=172.16.0.21
    GATEWAY=172.16.0.254
    NETMASK=255.255.255.0
    DNS1=202.96.128.86
    DNS2=114.114.114.114
    EOF
    
    #修改grub与网卡名称一致
    cp /etc/sysconfig/grub /etc/sysconfig/grub.bak
    cp /etc/default/grub /etc/default/grub.bak
    sed -i 's/rhgb/& crashkernel=auto biosdevname=0 net.ifnames=0/' /etc/default/grub
    sed -i 's/rhgb/& crashkernel=auto biosdevname=0 net.ifnames=0/' /etc/sysconfig/grub
    grub2-mkconfig -o /boot/grub2/grub.cfg
    systemctl restart network.service
    
    #以上是简单优化,注意优化完成需要重启一次系统,网卡命名eth0才生效
    reboot
    
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  • 原文地址:https://www.cnblogs.com/blog-tim/p/10554186.html
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