Docker stopped all of sudden in CentOS 7

Question

I was running docker on my CentOS 7 machine. Today I was trying to upgrade a container. So I stopped the container and tried to pull new image.

I got the below error

Error getting v2 registry: Get https://registry-1.docker.io/v2/: proxyconnect tcp: dial tcp: lookup https_proxy=http: no such host"

I checked the proxy setting for machine in cat /etc/environment and for docker in cat /etc/systemd/system/docker.service.d/http-proxy.conf

It is set correctly. I enabled daemon logs for docker and the logs says

Sep 14 10:43:18 myCentOsServer kernel: [4913751.074277] docker0: port 1(veth1e3300a) entered disabled state
Sep 14 10:43:18 myCentOsServer kernel: [4913751.084599] docker0: port 1(veth1e3300a) entered disabled state
Sep 14 10:43:18 myCentOsServer kernel: [4913751.084888] docker0: port 1(veth1e3300a) entered disabled state
Sep 14 10:43:18 myCentOsServer NetworkManager[794]: <info>  [1505349798.0267] device (veth1e3300a): released from master device docker0
Sep 14 10:44:48 myCentOsServer dockerd[29136]: time="2017-09-14T10:44:48.802236300+10:00" level=warning msg="Error getting v2 registry: Get https://registry-1.docker.io/v2/: proxyconnect tcp: dial tcp: lookup https_proxy=http: no such host"

I tried below commands but it is stuck.

systemctl daemon-reload
systemctl restart docker

Any idea what might be the issue.

Thanks in advance.

Answer 1

I was finally able to solve this issue.
Issue was with my docker mount points. Mine was set as /var/lib/docker and I suspect it got courrupted when I did data volume export.

Steps I followed
1) Navigated to /var/lib/docker, took a backup of images,containers and volumes folder and deleted them.
2) Reloaded the Daemon
3) Restarted the docker.

Now it is working fine.
However bad news is I lost my datadump which I took from one of the containers (using volumes-from).
But it was a dev version of software. So I reinstalled and did the setup.