当我把Docker版本更新到0.8.0后，我在输入sudo Docker version时得到了一个错误消息:
Client version: 0.8.0
Go version (client): go1.2
Git commit (client): cc3a8c8
2014/02/19 12:54:16 Can't connect to docker daemon. Is 'docker -d' running on this host?
我按照说明，输入命令sudo docker -d，我得到了这个:
[/var/lib/docker|2462000b] +job initserver()
[/var/lib/docker|2462000b.initserver()] Creating server
open /var/lib/docker/aufs/layers/cf2414da53f9bcfaa48bc3d58360d7f1cfd3784e4fe51fbef95197709dfc285d: no such file or directory[/var/lib/docker|2462000b] -job initserver() = ERR (1)
2014/02/19 12:55:57 initserver: open /var/lib/docker/aufs/layers/cf2414da53f9bcfaa48bc3d58360d7f1cfd3784e4fe51fbef95197709dfc285d: no such file or directory
我怎么解决这个问题?
要修复此问题，您需要在终端中发出以下命令。我将解释每一步:
# Uninstall Docker from apt packages
$ sudo apt-get remove docker docker.io
# Remove it from the libraries just to be
# sure it's gone forever
$ sudo rm -rf /var/lib/docker/*
现在，如果你想简化事情并获得更多时间，你可以使用参数installDocker运行我的init脚本:
# Pull the init script from GitHub
$ wget https://github.com/dminca/dotfiles/blob/master/init
# Add rights to run the script
$ chmod 755 init
# Just run the script with the installDocker parameter
$ ./init installDocker
重新启动是可选的，但我建议您这样做，以确保一切正常运行。
我有同样的错误，并尝试docker-machine regenerate-certs或eval..对我没用。
这适用于OS X 10.11.3 (El Capitan)和Docker v1.10.1。我只能通过删除和重新创建docker-machine来修复它。源
如果运行docker-machine ls，它会显示与下面类似的输出;
码头工人
未知的
错误
Unable to query docker version: Cannot
连接到docker引擎端点
试着移除Docker机器;
docker-machine rm -f default
其中默认是Docker机器名。然后;
docker-machine create -d virtualbox default
创建一个新的Docker机器。
再次检查现在一切看起来正常(没有错误或未知Docker):
docker-machine ls
最后，在你继续或运行Docker快速入门终端之前，不要忘记运行“$(Docker -machine env default)”。
检查你是否正在使用Docker Machine:)
运行docker-machine env default就可以了。
因为根据文档:
Docker Machine is a tool that lets you install Docker Engine on
virtual hosts, and manage the hosts with docker-machine commands. You
can use Machine to create Docker hosts on your local Mac or Windows
box, on your company network, in your data center, or on cloud
providers like AWS or Digital Ocean.
Using docker-machine commands, you can start, inspect, stop, and
restart a managed host, upgrade the Docker client and daemon, and
configure a Docker client to talk to your host.
Point the Machine CLI at a running, managed host, and you can run
docker commands directly on that host. For example, run
docker-machine env default to point to a host called default, follow on-screen
instructions to complete env setup, and run docker ps,
docker run hello-world, and so forth.
https://docs.docker.com/machine/overview/
