CentOS7上安装docker
前置需求
Docker requires a 64-bit installation regardless of your CentOS version. Also, your kernel must be 3.10 at minimum, which CentOS 7 runs.
To check your current kernel version, open a terminal and use uname -r
to display your kernel version:
$ uname -r 3.10.0-229.el7.x86_64
Finally, is it recommended that you fully update your system. Please keep in mind that your system should be fully patched to fix any potential kernel bugs. Any reported kernel bugs may have already been fixed on the latest kernel packages.
安装
使用yum安装
-
Log into your machine as a user with
sudo
orroot
privileges. -
Make sure your existing yum packages are up-to-date.
$ sudo yum update
-
Add the yum repo.
$ cat >/etc/yum.repos.d/docker.repo <<-EOF [dockerrepo] name=Docker Repository baseurl=https://yum.dockerproject.org/repo/main/centos/7 enabled=1 gpgcheck=1 gpgkey=https://yum.dockerproject.org/gpg EOF
-
Install the Docker package.
$ sudo yum install docker-engine
-
Start the Docker daemon.
[root@localhost yum.repos.d]# service docker start Redirecting to /bin/systemctl start docker.service [root@localhost yum.repos.d]# systemctl status docker.service docker.service - Docker Application Container Engine Loaded: loaded (/usr/lib/systemd/system/docker.service; disabled) Active: active (running) since Mon 2015-11-23 12:02:49 CST; 38s ago Docs: https://docs.docker.com Main PID: 24604 (docker) CGroup: /system.slice/docker.service └─24604 /usr/bin/docker daemon -H fd:// Nov 23 12:02:42 localhost docker[24604]: time="2015-11-23T12:02:42.525348139+08:00"...k" Nov 23 12:02:43 localhost docker[24604]: time="2015-11-23T12:02:43.186687088+08:00"...." Nov 23 12:02:48 localhost docker[24604]: time="2015-11-23T12:02:48.445011858+08:00"...e" Nov 23 12:02:48 localhost docker[24604]: time="2015-11-23T12:02:48.707777823+08:00"...s" Nov 23 12:02:49 localhost docker[24604]: time="2015-11-23T12:02:49.199709207+08:00"...." Nov 23 12:02:49 localhost docker[24604]: time="2015-11-23T12:02:49.200088699+08:00"...." Nov 23 12:02:49 localhost docker[24604]: time="2015-11-23T12:02:49.200255413+08:00"...n" Nov 23 12:02:49 localhost docker[24604]: time="2015-11-23T12:02:49.200283835+08:00"....1 Nov 23 12:02:49 localhost systemd[1]: Started Docker Application Container Engine. Hint: Some lines were ellipsized, use -l to show in full.
-
Verify
docker
is installed correctly by running a test image in a container.
[linus_dev@localhost repo]$ docker run hello-world Cannot connect to the Docker daemon. Is the docker daemon running on this host? [root@localhost yum.repos.d]# sudo docker run hello-world Unable to find image 'hello-world:latest' locally latest: Pulling from library/hello-world b901d36b6f2f: Verifying Checksum 0a6ba66e537a: Verifying Checksum Pulling repository docker.io/library/hello-world 975b84d108f1: Download complete 3f12c794407e: Download complete Status: Downloaded newer image for hello-world:latest docker.io/library/hello-world: this image was pulled from a legacy registry. Important: This registry version will not be supported in future versions of docker. Hello from Docker. This message shows that your installation appears to be working correctly. To generate this message, Docker took the following steps: 1. The Docker client contacted the Docker daemon. 2. The Docker daemon pulled the "hello-world" image from the Docker Hub. 3. The Docker daemon created a new container from that image which runs the executable that produces the output you are currently reading. 4. The Docker daemon streamed that output to the Docker client, which sent it to your terminal. To try something more ambitious, you can run an Ubuntu container with: $ docker run -it ubuntu bash Share images, automate workflows, and more with a free Docker Hub account: https://hub.docker.com For more examples and ideas, visit: https://docs.docker.com/userguide/
使用脚本安装
-
Log into your machine as a user with
sudo
orroot
privileges. -
Make sure your existing yum packages are up-to-date.
$ sudo yum update
-
Run the Docker installation script.
$ curl -sSL https://get.docker.com/ | sh
This script adds the
docker.repo
repository and installs Docker. -
Start the Docker daemon.
$ sudo service docker start
-
Verify
docker
is installed correctly by running a test image in a container.$ sudo docker run hello-world
创建一个docker组
The docker
daemon binds to a Unix socket instead of a TCP port. By default that Unix socket is owned by the user root
and other users can access it with sudo
. For this reason, docker
daemon always runs as the root
user.
To avoid having to use sudo
when you use the docker
command, create a Unix group called docker
and add users to it. When the docker
daemon starts, it makes the ownership of the Unix socket read/writable by the docker
group.
Warning: The
docker
group is equivalent to theroot
user; For details on how this impacts security in your system, see Docker Daemon Attack Surface for details.
To create the docker
group and add your user:
-
Log into Centos as a user with
sudo
privileges. -
Create the
docker
group and add your user.sudo usermod -aG docker your_username
-
Log out and log back in.
This ensures your user is running with the correct permissions.
-
Verify your work by running
docker
withoutsudo
.$ docker run hello-world
启动时默认启动docker
To ensure Docker starts when you boot your system, do the following:
$ sudo chkconfig docker on
If you need to add an HTTP Proxy, set a different directory or partition for the Docker runtime files, or make other customizations, read our Systemd article to learn how to customize your Systemd Docker daemon options.
卸载
You can uninstall the Docker software with yum
.
-
List the package you have installed.
$ yum list installed | grep docker yum list installed | grep docker docker-engine.x86_64 1.7.1-1.el7 @/docker-engine-1.7.1-1.el7.x86_64.rpm
-
Remove the package.
$ sudo yum -y remove docker-engine.x86_64
This command does not remove images, containers, volumes, or user-created configuration files on your host.
-
To delete all images, containers, and volumes, run the following command:
$ rm -rf /var/lib/docker
-
Locate and delete any user-created configuration files.
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