linux centos7.5修改主机名和ip永久生效及centos8重启网络

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  2 16:00:30 2019
[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 7 (Core)
       CPE OS Name: cpe:/o:centos:centos:7
            Kernel: Linux 3.10.0-957.el7.x86_64
      Architecture: x86-64
[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-2267-4535-a658-39d7482dfabd
DEVICE=ens33
#ONBOOT=no


ONBOOT=yes
DNS1=192.168.48.2
IPADDR=192.168.48.131
PREFIX=24
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=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.48.136  netmask 255.255.255.0  broadcast 192.168.48.255
        inet6 fe80::4518:624d:7d8a:a50a  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:81:52:7c  txqueuelen 1000  (Ethernet)
        RX packets 588  bytes 47002 (45.9 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 180  bytes 15288 (14.9 KiB)
        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 142  bytes 14908 (14.5 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 142  bytes 14908 (14.5 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 52:54:00:68:82:87  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

[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