1.简单解决
chkconfig network on
chkconfig NetworkManager off
service NetworkManager stop
service network restart
还是不行的话接着
2解决virbr0问题
service network restart
2.1 重启网络
还是报错
[root@localhost ~]# journalctl -xe Mar 27 01:46:09 localhost.localdomain polkitd[639]: Registered Authentication Agent for unix-process:3228:511341 (system bus name :1.147 [/u Mar 27 01:46:09 localhost.localdomain systemd[1]: Starting LSB: Bring up/down networking... -- Subject: Unit network.service has begun start-up -- Defined-By: systemd -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- -- Unit network.service has begun starting up. Mar 27 01:46:11 localhost.localdomain NET[3361]: /etc/sysconfig/network-scripts/ifup-post : updated /etc/resolv.conf Mar 27 01:46:11 localhost.localdomain network[3235]: Bringing up loopback interface: [ OK ] Mar 27 01:46:11 localhost.localdomain NetworkManager[646]: <info> [1585298771.5452] agent-manager: req[0x55beaec813c0, :1.158/nmcli-connect Mar 27 01:46:11 localhost.localdomain NetworkManager[646]: <info> [1585298771.5703] audit: op="connection-activate" uuid="79df13d6-0d33-4de Mar 27 01:46:11 localhost.localdomain network[3235]: Bringing up interface eno16777736: Error: Connection activation failed: No suitable de Mar 27 01:46:11 localhost.localdomain network[3235]: [FAILED]
2.2 干 掉virbr0
接着看，有virbr0，干 掉
[root@localhost ~]# ifconfig 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 512 bytes 44544 (43.5 KiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 512 bytes 44544 (43.5 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 52:54:00:8c:be:b1 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
2.3禁用libvirtd 服务
干 掉,在 CentOS 7 系统的安装过程中，如果有选择相关虚拟化的的服务安装系统后，启动网卡时会发现有一个以网桥连接的私网地址的 virbr0 网卡，这个是因为在虚拟化中有使用到 libvirtd 服务生成的，如果不需要可以关闭后去掉
[root@node ~]# ifconfig virbr0 down [root@node ~]# brctl delbr virbr0 #brctl删除网桥
[root@node ~]# systemctl stop libvirtd.service
[root@node ~]# systemctl disable libvirtd.service # 禁用libvirtd 服务开机自启动
[root@node ~]# systemctl status libvirtd.service
root@localhost ~]# ifconfig virbr0 down [root@localhost ~]# brctl delbr virbr0 #brctl [root@localhost ~]# systemctl stop libvirtd.service [root@localhost ~]# systemctl disable libvirtd.service Removed symlink /etc/systemd/system/multi-user.target.wants/libvirtd.service. Removed symlink /etc/systemd/system/sockets.target.wants/virtlogd.socket. [root@localhost ~]# systemctl status libvirtd.service ● libvirtd.service - Virtualization daemon Loaded: loaded (/usr/lib/systemd/system/libvirtd.service; disabled; vendor preset: enabled) Active: inactive (dead) since Fri 2020-03-27 01:56:04 PDT; 20s ago [root@localhost ~]# ifconfig 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 512 bytes 44544 (43.5 KiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 512 bytes 44544 (43.5 KiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 [root@localhost ~]#
3：解决ens33问题
3.1 无ens33文件，
若ifconfig -a出现ens33,无enozzzzzzzz,则mv ifcfg-enzzzz ifcfg-ens33,修改device name 为ens33
3.2删除rules文件
[root@localhost network-scripts]# cd /etc/udev/rules.d [root@localhost rules.d]# ll total 8 -rw-r--r-- 1 root root 628 Feb 5 2019 70-persistent-ipoib.rules -rw-r--r-- 1 root root 161 Mar 26 22:38 90-eno-fix.rules [root@localhost rules.d]# rm -rf *.rules [root@localhost rules.d]# ll total 0
ifconfig -a
[root@localhost rules.d]# ifconfig -a eno16777736: flags=4098<BROADCAST,MULTICAST> mtu 1500 ether 00:0c:29:24:77:5f 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 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 512 bytes 44544 (43.5 KiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 512 bytes 44544 (43.5 KiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 virbr0-nic: flags=4098<BROADCAST,MULTICAST> mtu 1500 ether 52:54:00:8c:be:b1 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 rules.d]#
3.3编辑网卡文件，保证文件名，name device一致
3.4 启动网卡，验证
ifconfig eno16777736 up
