我按照此处的说明安装了 docker：
https://docs.docker.com/install/linux/docker-ce/debian/
我在使用 armbian buster (10)。问题是 docker0 破坏了主机的 dns，我不知道为什么。dns 也不适用于容器。
nmcli dev show | grep 'IP4.DNS'
IP4.DNS[1]: 192.168.1.1
sudo route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default _gateway 0.0.0.0 UG 100 0 0 eth0
link-local 0.0.0.0 255.255.0.0 U 1000 0 0 eth0
172.17.0.0 0.0.0.0 255.255.0.0 U 0 0 0 docker0
192.168.1.0 0.0.0.0 255.255.255.0 U 100 0 0 eth0
sudo ifconfig
docker0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
inet 172.17.0.1 netmask 255.255.0.0 broadcast 172.17.255.255
ether 02:42:7b:98:37:66 txqueuelen 0 (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
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.1.160 netmask 255.255.255.0 broadcast 192.168.1.255
inet6 fe80::2974:98e8:289b:f3fb prefixlen 64 scopeid 0x20<link>
ether 82:38:2f:c9:e0:80 txqueuelen 1000 (Ethernet)
RX packets 1599 bytes 254405 (248.4 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 1289 bytes 489915 (478.4 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device interrupt 24
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 1 (Local Loopback)
RX packets 3150 bytes 1106993 (1.0 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 3150 bytes 1106993 (1.0 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
删除 docker0 后一切正常。如果有人能解释一下问题所在，我将不胜感激。
/etc/resolv.conf 的内容：
# This file is managed by man:systemd-resolved(8). Do not edit.
#
# This is a dynamic resolv.conf file for connecting local clients directly to
# all known uplink DNS servers. This file lists all configured search domains.
#
# Third party programs must not access this file directly, but only through the
# symlink at /etc/resolv.conf. To manage man:resolv.conf(5) in a different way,
# replace this symlink by a static file or a different symlink.
#
# See man:systemd-resolved.service(8) for details about the supported modes of
# operation for /etc/resolv.conf.
# No DNS servers known.
sudo systemd-resolve status
status: resolve call failed: All attempts to contact name servers or networks failed
不使用docker时/etc/resolv.conf的内容：
# Generated by NetworkManager
search lan
nameserver 192.168.1.1
发行版是 debian 10 (armbian)
通过增加：
搜索局域网名称服务器 192.168.1.1
到 /etc/resolv.conf 它可以工作但重启后无法继续。