'Failed to ssh to machine after installing Docker

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?

networkingssh


Solution 1:[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

Solution 2:[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/.

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Gil Hiram
Solution 2 Ras Dwivedi

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