作为服务器还是静态ip比较靠谱;
ip管理主文件存放于/etc/sysconfig/network-scripts/ 目录
#ls/etc/sysconfig/network-scripts/ ifcfg-eno1ifdown-bnepifdown-ipppifdown-postifdown-sitifdown-tunnelifup-bnepifup-ipppifup-plipifup-pppifup-Teamifup-wirelessnetwork-functions-ipv6 ifcfg-loifdown-ethifdown-ipv6ifdown-pppifdown-Teamifupifup-ethifup-ipv6ifup-plusbifup-routesifup-TeamPortinit.ipv6-global ifdownifdown-ibifdown-isdnifdown-routesifdown-TeamPortifup-aliasesifup-ibifup-isdnifup-postifup-sitifup-tunnelnetwork-functions
CentOS默认使用第一个文件ifcfg-eno1作为主配置；#每个机器可能不同，以显示为准
查看eno1配置：
#cat/etc/sysconfig/network-scripts/ifcfg-eno1 TYPE=Ethernet BOOTPROTO=dhcp DEFROUTE=yes PEERDNS=yes PEERROUTES=yes IPV4_FAILURE_FATAL=no IPV6INIT=yes IPV6_AUTOCONF=yes IPV6_DEFROUTE=yes IPV6_PEERDNS=yes IPV6_PEERROUTES=yes IPV6_FAILURE_FATAL=no NAME=eno1 UUID=ea4bbbab-1804-46df-b8f9-1451e5a710fc DEVICE=eno1 ONBOOT=no
主要修改标识如下
#vi/etc/sysconfig/network-scripts/ifcfg-eno1
使用 i 进入INSERT操作进而编辑
TYPE=Ethernet BOOTPROTO=static DEFROUTE=yes PEERDNS=yes PEERROUTES=yes IPV4_FAILURE_FATAL=no IPV6INIT=yes IPV6_AUTOCONF=yes IPV6_DEFROUTE=yes IPV6_PEERDNS=yes IPV6_PEERROUTES=yes IPV6_FAILURE_FATAL=no NAME=eno1 UUID=ea4bbbab-1804-46df-b8f9-1451e5a710fc DEVICE=eno1 ONBOOT=yes IPADDR=192.168.1.45 GATEWAY=192.168.1.1 NETMASK=255.255.255.0 DNS1=192.168.1.1
说明如下：
BOOTPROTO=static#使用static配置 ONBOOT=yes#开机启用本配置 IPADDR=192.168.1.45#静态IP GATEWAY=192.168.1.1#默认网关 NETMASK=255.255.255.0#子网掩码 DNS1=192.168.1.1#DNS配置
# systemctl restart network.service 重启网络服务
# ip addr 查看静态ip
1:lo:mtu65536qdiscnoqueuestateUNKNOWN link/loopback00:00:00:00:00:00brd00:00:00:00:00:00 inet127.0.0.1/8scopehostlo valid_lftforeverpreferred_lftforever inet6::1/128scopehost valid_lftforeverpreferred_lftforever 2:eno1:mtu1500qdiscpfifo_faststateUPqlen1000 link/ether6c:0b:84:3c:70:efbrdff:ff:ff:ff:ff:ff inet192.168.1.45/24brd192.168.1.255scopeglobaleno1 valid_lftforeverpreferred_lftforever inet6fe80::6e0b:84ff:fe3c:70ef/64scopelink valid_lftforeverpreferred_lftforever
可见已经生效
# ping 192.168.1.52 测试局域网内联通性
PING 192.168.1.52 (192.168.1.52) 56(84) bytes of data.
64 bytes from 192.168.1.52: icmp_seq=1 ttl=64 time=0.864 ms
64 bytes from 192.168.1.52: icmp_seq=2 ttl=64 time=0.464 ms
ps：最好在路由器侧对ip和mac静态绑定，以便后续恢复！
完
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在部分情况下，ifcfg文件内部有“”，我们再添加修改时要全部保留，否则会报错；
另外最后的DNS1改成DNS时偶尔也会不识别，按说明不应该报错，待确认...
原文链接：https://www.f2er.com/centos/380719.html