Centos安装与配置

一、安装

• 默认安装

二、配置

1. 配置网卡

   BOOTPROTO=none
   ONBOOT=yes
   IPADDR=xxx.xxx.x.xx
   PREFIX=24
   GATEWAY=xxx.xxx.x.x
   DNS1=xxx.xxx.x.x
   
   注：删掉网卡内的UUID ，通用唯一识别码和HWADDR   MAC地址  这两行。  所有网卡都需要删除

2. 安装wget:yum -y install wget；
3. 修改为阿里的yum源

   1、cd /etc/yum.repos.d
   2、备份
       mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
       或
       mv /etc/yum/repos.d/CentOS-Base.repo{,.date -I}
   3、下载版本
     wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
   4、添加epel
     wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
   5、生成缓存
    yum clean all
    yum makecache

4. 下载常用工具

   yum -y install wget net-tools screen lsof tcpdump nc mtr openssl-devel vim bash-completion lrzsz nmap telnet tree ntpdate bash-completion chrony vsftpd
   提升效率：
   yum -y install ncdu glances mosh rsync

5. 关闭selinux

   sed -i.bak 's#SELINUX=enforcing#SELINUX=disabled#g' /etc/selinux/config

6. 关闭防火墙

   systemctl stop firewalld
   systemctl disable firewalld

7. 修改主机名

   hostnamectl set-hostname 7mini

8. 修改字符集

   localectl status      #查看当前字符集
   # localectl set-locale LANG=zh_CN.UTF-8     #修改字符集为zh_CN.UTF-8，命令行和配置文件都生效
   # cat /etc/locale.conf       #查看配置文件
   LANG=zh_CN.UTF-8

9. 修改文件数限制

   ulimit -n         #默认大小
   1024
   echo "* soft nofile 65536" >> /etc/security/limits.conf         #xi修改最大限制为65535
   echo "* hard nofile 65536" >> /etc/security/limits.conf
   reboot           #重启后生效　

10. 时间同步

    ntpdate ntp1.aliyun.com 
    cp /etc/chrony.conf{,.bak}
    
    vim /etc/chrony.conf
    server ntp6.aliyun.com iburst
     
    systemctl start chronyd
    systemctl enable chronyd #开机启动
    systemctl restart chronyd
    chronyc sources #查看同步源
    [root@7mini-node2 ~]# chronyc sources 
    210 Number of sources = 1
    MS Name/IP address Stratum Poll Reach LastRx Last sample 
    ===============================================================================
    ^* 203.107.6.88 2 6 17 31 +653us[+1965us] +/- 32ms
    
    2)或者通过计划任务进行同步
    [root@linux-node1 ~]# crontab -e
    no crontab for root - using an empty one
    crontab: installing new crontab
    [root@linux-node1 ~]# crontab -l
    */5 * * * * /usr/sbin/ntpdate time1.aliyun.com > /dev/null

11. 可参考：https://www.cnblogs.com/jokerbj/p/9133093.html