虚拟机启动后ens33处于DOWN状态，无法远程连接

平时用于学习和测试，在本地通过VMware部署了Ubuntu服务器，并配置了静态IP，方便远程连接。在某次启动虚拟机后，发现无法通过SSH连接。

用ip addr查看，发现ens33处于DOWN状态

root@shawn-virtual-machine:~# ip addr
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:e8:2a:60 brd ff:ff:ff:ff:ff:ff
    altname enp2s1
3: docker0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default 
    link/ether 02:42:f9:61:85:8e 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:f9ff:fe61:858e/64 scope link 
       valid_lft forever preferred_lft forever
5: veth4e95064@if4: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master docker0 state UP group default 
    link/ether ee:24:fb:85:7e:8e brd ff:ff:ff:ff:ff:ff link-netnsid 0
    inet6 fe80::ec24:fbff:fe85:7e8e/64 scope link 
       valid_lft forever preferred_lft forever

解决：
执行

dhclient ens33

再次用ip addr查看查看

oot@shawn-virtual-machine:~# ip addr
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,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:0c:29:e8:2a:60 brd ff:ff:ff:ff:ff:ff
    altname enp2s1
    inet 192.168.17.128/24 brd 192.168.17.255 scope global dynamic ens33
       valid_lft 1799sec preferred_lft 1799sec
    inet6 fe80::20c:29ff:fee8:2a60/64 scope link tentative 
       valid_lft forever preferred_lft forever
3: docker0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default 
    link/ether 02:42:f9:61:85:8e 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:f9ff:fe61:858e/64 scope link 
       valid_lft forever preferred_lft forever
5: veth4e95064@if4: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master docker0 state UP group default 
    link/ether ee:24:fb:85:7e:8e brd ff:ff:ff:ff:ff:ff link-netnsid 0
    inet6 fe80::ec24:fbff:fe85:7e8e/64 scope link 
       valid_lft forever preferred_lft forever

但是在每次虚拟机重启后都需要重新执行；

如果想要彻底解决这个问题，就需要开启NM托管：

#查看托管状态
nmcli n
#开启托管
nmcli n on
#重启
systemctl restart NetworkManager