Docker is not restarting.

Problem:

docker is not restarting, even after restarting docker by clicking icon (MacOS).

Haans-MBP:Fabric haanmo$ docker-machine restart 

Restarting "default"...

Waiting for SSH to be available...

Too many retries waiting for SSH to be available.  Last error: Maximum number of retries (60) exceeded

Solution:
just start docker again by CLI.

Haans-MBP:Fabric haanmo$ docker-machine start

Starting "default"...

(default) Waiting for an IP...

Machine "default" was started.

Waiting for SSH to be available...

Detecting the provisioner...

Started machines may have new IP addresses. You may need to re-run the `docker-machine env` command.

Haans-MBP:Fabric haanmo$ docker ps

CONTAINER ID        IMAGE                                     COMMAND                  CREATED             STATUS              PORTS                                            NAMES

47359ce3dae9        hyperledger/fabric-peer:x86_64-1.1.0      "peer node start"        2 days ago          Up 2 days           0.0.0.0:7051->7051/tcp, 0.0.0.0:7053->7053/tcp   peer0.org1.example.com

080624edfe8f        hyperledger/fabric-orderer:x86_64-1.1.0   "orderer"                2 days ago          Up 2 days           0.0.0.0:7050->7050/tcp                           orderer.example.com

9413d740e731        hyperledger/fabric-couchdb:x86_64-0.4.6   "tini -- /docker-ent…"   2 days ago          Up 2 days           4369/tcp, 9100/tcp, 0.0.0.0:5984->5984/tcp       couchdb

0361aad7f282        hyperledger/fabric-ca:x86_64-1.1.0        "sh -c 'fabric-ca-se…"   2 days ago          Up 2 days           0.0.0.0:7054->7054/tcp                           ca.org1.example.com

Haans-MBP:Fabric haanmo$