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今天开机准备开干，发现Ubuntu数据库什么的都连不上了，像往常一样先查ip结果发现ip像下面一样没有了

root1@ubuntu:~$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether 00:0c:29:e4:45:80 brd ff:ff:ff:ff:ff:ff
3: docker0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default 
    link/ether 02:42:67:8b:25:5a brd ff:ff:ff:ff:ff:ff
    inet 172.17.0.1/16 brd 172.17.255.255 scope global docker0
       valid_lft forever preferred_lft forever
    inet6 fe80::42:67ff:fe8b:255a/64 scope link 
       valid_lft forever preferred_lft forever
5: veth7bd5389@if4: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master docker0 state UP group default 
    link/ether f2:ff:b8:6d:08:35 brd ff:ff:ff:ff:ff:ff link-netnsid 0
    inet6 fe80::f0ff:b8ff:fe6d:835/64 scope link 
       valid_lft forever preferred_lft forever

只要先启动ens

sudo ip link set ens33 up

再分配ip地址，就可以了，前提是网卡配置没问题，我用的是桥接模式，会分配一个当前物理网络下的ip。

sudo dhclient ens33