一， /boot分区备份 二，网络配置 修改主机名：
#vi /etc/sysconfig/network
NETWORKING=yes
#HOSTNAME=localhost.localdomain
HOSTNAME=CentOS-1
#也可以在这里设置网关
#GATEWAY=192。168.30.1
设置网络为DHCP获取
vi /etc/sysconfig/network-scrip/ifcfg-eth0
DEVICE="eth0"
BOOTPROTO="dhcp"
HWADDR="08:00:27:A7:AB:97"
NM_CONTROLLED="no"
ONBOOT="no"
TYPE="Ethernet"
UUID="9622f9e1-6218-4c56-9f45-7ae29b477e89"
设置静态IP
vi /etc/sysconfig/network-scrip/ifcfg-eth0
[root@CentOS-3 ssh]# cat /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
BOOTPROTO=none
HWADDR=08:00:27:e2:62:9b
NM_CONTROLLED=no
ONBOOT=yes
TYPE=Ethernet
IPADDR=192.168.30.223
NETMASK=255.255.255.0
GATEWAY=192.168.30.1
DNS=8.8.8.8
USERCTL=no
IPV6INIT=no
三，安装wget工具 yum install wget
四，源配置
cd /etc/yum.repos.d
mv CentOS-Base.repo bak-CentOS-Base.repo
wget http://mirrors.163.com/.help/CentOS6-Base-163.repo
yum clean all
yum makecache
五，ssh密钥配置 https://www.qb5200.com/os/RedHat/63316.html六，sudo配置 七，编译环境和工具的安装
yum groupinstall "Development Libraries" "Development Tools"
