centos7配置hostname和ip地址（永久有效）

一、修改hostname

1、查看当前hostname

[root@localhost~]# hostname
localhost

2、配置新主机名

[root@localhost~]# hostnamectl set-hostname test88

3、修改/etc/hosts文件并保存

[root@localhost~]# vim /etc/hosts

127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 test88
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
~

：wq

二、修改ip地址

1、查看本机网卡信息

[root@test00 ~]# ifconfig
enp0s3: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
        inet 192.168.3.253 netmask 255.255.255.0 broadcast 192.168.3.255
        inet6 fe80::dfec:d75c:a23c:244d prefixlen 64 scopeid 0x20<link>
        ether 08:00:27:13:b7:01 txqueuelen 1000 (Ethernet)
        RX packets 184780 bytes 266278597 (253.9 MiB)
        RX errors 0 dropped 0 overruns 0 frame 0
        TX packets 30875 bytes 1943437 (1.8 MiB)
        TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
        inet 127.0.0.1 netmask 255.0.0.0
        inet6 ::1 prefixlen 128 scopeid 0x10<host>
        loop txqueuelen 1000 (Local Loopback)
        RX packets 405 bytes 29144 (28.4 KiB)
        RX errors 0 dropped 0 overruns 0 frame 0
        TX packets 405 bytes 29144 (28.4 KiB)
        TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

virbr0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
        inet 192.168.122.1 netmask 255.255.255.0 broadcast 192.168.122.255
        ether 52:54:00:74:a9:ad txqueuelen 1000 (Ethernet)
        RX packets 0 bytes 0 (0.0 B)
        RX errors 0 dropped 0 overruns 0 frame 0
        TX packets 0 bytes 0 (0.0 B)
        TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

2、编辑对应的网卡文件

[root@test00 ~]#vim /etc/sysconfig/network-scripts/ifcfg-enp0s3

TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=none
DEFROUTE=yes
IPV4_FAILURE_FATAL=yes
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=enp0s3
UUID=7f12b8fc-f9d4-4908-8192-3e0f26a7c718
ONBOOT=yes
IPADDR=192.168.3.253 ！！！！！！！！！！！
PREFIX=24
GATEWAY=192.168.3.1
DNS1=8.8.8.8
~