linux centos7.5修改主机名和ip永久生效

以centos7.5为例

1.修改主机名

[root@localhost ~]# hostname
localhost.localdomain
[root@localhost ~]# hostname k8s-node1 ##临时生效
localhost.localdomain
[root@localhost ~]# hostnamectl set-hostname k8s-node1 ##重启后永久生效
[root@localhost ~]# reboot

重启后

Last login: Tue Apr   ::
[root@k8s-node1 ~]# hostname
k8s-node1
[root@k8s-node1 ~]# cat /etc/hostname
k8s-node1
[root@k8s-node1 ~]# hostnamectl
   Static hostname: k8s-node1
         Icon name: computer-vm
           Chassis: vm
        Machine ID: a5a43f5916c643bf83d6f99425a4b9d2
           Boot ID: 0043950ecb374652aebb84e6b8f05fa6
    Virtualization: vmware
  Operating System: CentOS Linux  (Core)
       CPE OS Name: cpe:/o:centos:centos:
            Kernel: Linux 3.10.-.el7.x86_64
      Architecture: x86-
[root@k8s-node1 ~]# 

修改ip

[root@k8s-node1 ~]# cat /etc/sysconfig/network-scripts/ifcfg-ens33
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=static
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=ens33
UUID=bf3736be---a658-39d7482dfabd
DEVICE=ens33
#ONBOOT=no

ONBOOT=yes
DNS1=192.168.48.2
IPADDR=192.168.48.131
PREFIX=
GATEWAY=192.168.48.2
PEERDNS=yes
PEERROUTES=yes
IPV6_PEERDNS=yes
IPV6_PEERROUTES=yes
[root@k8s-node1 ~]#
[root@k8s-node1 ~]#
[root@k8s-node1 ~]# service network restart
Restarting network (via systemctl):  [  确定  ]
[root@k8s-node1 ~]# 

3.centos8重启网络

nmcli c reload

nmcli c up ens33

ifconfig

[root@localhost network-scripts]# ifconfig
ens33: flags=<UP,BROADCAST,RUNNING,MULTICAST>  mtu
        inet 192.168.48.136  netmask 255.255.255.0  broadcast 192.168.48.255
        inet6 fe80:::624d:7d8a:a50a  prefixlen   scopeid 0x20<link>
        ether :0c::::7c  txqueuelen   (Ethernet)
        RX packets   bytes  (45.9 KiB)
        RX errors   dropped   overruns   frame
        TX packets   bytes  (14.9 KiB)
        TX errors   dropped  overruns   carrier   collisions 

lo: flags=<UP,LOOPBACK,RUNNING>  mtu
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::  prefixlen   scopeid 0x10<host>
        loop  txqueuelen   (Local Loopback)
        RX packets   bytes  (14.5 KiB)
        RX errors   dropped   overruns   frame
        TX packets   bytes  (14.5 KiB)
        TX errors   dropped  overruns   carrier   collisions 

virbr0: flags=<UP,BROADCAST,MULTICAST>  mtu
        inet 192.168.122.1  netmask 255.255.255.0  broadcast 192.168.122.255
        ether :::::  txqueuelen   (Ethernet)
        RX packets   bytes  (0.0 B)
        RX errors   dropped   overruns   frame
        TX packets   bytes  (0.0 B)
        TX errors   dropped  overruns   carrier   collisions 

[root@localhost network-scripts]# 

4.虚拟机网络配置

注意ip和网关要在同一网段

5.验证