1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
|
page_title: Installation on CentOS
page_description: Instructions for installing Docker on CentOS
page_keywords: Docker, Docker documentation, requirements, linux, centos, epel, docker.io, docker-io
# CentOS
Docker is supported on the following versions of CentOS:
- [*CentOS 7 (64-bit)*](#installing-docker-centos-7)
- [*CentOS 6.5 (64-bit)*](#installing-docker-centos-6.5) or later
These instructions are likely work for other binary compatible EL6/EL7 distributions
such as Scientific Linux, but they haven't been tested.
Please note that due to the current Docker limitations, Docker is able to
run only on the **64 bit** architecture.
## Kernel support
Currently the CentOS project will only support Docker when running on kernels
shipped by the distribution. There are kernel changes which will cause issues
if one decides to step outside that box and run non-distribution kernel packages.
To run Docker on [CentOS-6.5](http://www.centos.org) or later, you will need
kernel version 2.6.32-431 or higher as this has specific kernel fixes to allow
Docker to run.
## CentOS-7
### Installation
Docker is included by default in the CentOS-Extras repository. To install
run the following command:
$ sudo yum install docker
Please continue with the [Starting the Docker daemon](#starting-the-docker-daemon).
### Uninstallation
To uninstall the Docker package:
$ sudo yum -y remove docker
The above command will not remove images, containers, volumes, or user created
configuration files on your host. If you wish to delete all images, containers,
and volumes run the following command:
$ rm -rf /var/lib/docker
You must delete the user created configuration files manually.
## CentOS-6.5
### Installation
For CentOS-6.5, the Docker package is part of [Extra Packages
for Enterprise Linux (EPEL)](https://fedoraproject.org/wiki/EPEL) repository,
a community effort to create and maintain additional packages for the RHEL distribution.
Firstly, you need to ensure you have the EPEL repository enabled. Please
follow the [EPEL installation instructions](
https://fedoraproject.org/wiki/EPEL#How_can_I_use_these_extra_packages.3F).
For CentOS-6, there is a package name conflict with a system tray application
and its executable, so the Docker RPM package was called `docker-io`.
To proceed with `docker-io` installation on CentOS-6, you may need to remove the
`docker` package first.
$ sudo yum -y remove docker
Next, let's install the `docker-io` package which will install Docker on our host.
$ sudo yum install docker-io
Please continue with the [Starting the Docker daemon](#starting-the-docker-daemon).
### Uninstallation
To uninstall the Docker package:
$ sudo yum -y remove docker-io
The above command will not remove images, containers, volumes, or user created
configuration files on your host. If you wish to delete all images, containers,
and volumes run the following command:
$ rm -rf /var/lib/docker
You must delete the user created configuration files manually.
## Manual installation of latest Docker release
While using a package is the recommended way of installing Docker,
the above package might not be the current release version. If you need the latest
version, [you can install the binary directly](
https://docs.docker.com/installation/binaries/).
When installing the binary without a package, you may want
to integrate Docker with Systemd. For this, install the two unit files
(service and socket) from [the GitHub
repository](https://github.com/docker/docker/tree/master/contrib/init/systemd)
to `/etc/systemd/system`.
Please continue with the [Starting the Docker daemon](#starting-the-docker-daemon).
## Starting the Docker daemon
Once Docker is installed, you will need to start the docker daemon.
$ sudo service docker start
If we want Docker to start at boot, we should also:
$ sudo chkconfig docker on
Now let's verify that Docker is working. First we'll need to get the latest
`centos` image.
$ sudo docker pull centos
Next we'll make sure that we can see the image by running:
$ sudo docker images centos
This should generate some output similar to:
$ sudo docker images centos
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
centos latest 0b443ba03958 2 hours ago 297.6 MB
Run a simple bash shell to test the image:
$ sudo docker run -i -t centos /bin/bash
If everything is working properly, you'll get a simple bash prompt. Type
`exit` to continue.
## Custom daemon options
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](/articles/systemd/).
## Dockerfiles
The CentOS Project provides a number of sample Dockerfiles which you may use
either as templates or to familiarize yourself with docker. These templates
are available on GitHub at [https://github.com/CentOS/CentOS-Dockerfiles](
https://github.com/CentOS/CentOS-Dockerfiles)
**Done!** You can either continue with the [Docker User
Guide](/userguide/) or explore and build on the images yourself.
## Issues?
If you have any issues - please report them directly in the
[CentOS bug tracker](http://bugs.centos.org).
|
