Failed to ssh to machine after installing Docker

Question

My ssh stops working after I successfully installed Docker (following the official site instruction https://docs.docker.com/engine/installation/ ) on an ubuntu machine A . Now my laptop cannot ssh to A but ok for other machines, say B , that sitting in the same.network environment as A . A can ssh to B and B can also ssh to A . What could be the problem? Can anyone suggest how I can make a diagnostic?

Answer 1

If you are using a vpn service you might be encountering an ip conflict between docker0 interface and your vpn service. to resolve this:

stop docker service:

sudo service docker stop

remove old docker0 interface created by docker

ip link del docker0

configure docker0 bridge (in my case i only had to define "bip" option)

start the docker service:

sudo service docker start

Answer 2

Most probably there is ip conflict between docker0 interface and your VPN service. As already answered, way is to stop docker service, remove docker0 interface and configure daemon.json file. I added following lines to my daemon.json

 {
 "default-address-pools":
     [
         {"base":"10.10.0.0/16","size":24}
     ]
}

My VPN was providing me an IP like 192.168. . so I chose a base IP that does not fall in that range. Note that the daemon.json file does not exist, so you have to create it in, etc/docker/.