Docker Linux Installation
Internal
Overview
Verified with Centos 7.
Prerequisites
A 3.8 kernel or later is required.
RedHat/Centos
The following sequence is based on the document linked above.
Uninstall Old Docker Versions
yum list installed | grep docker
yum erase ...
yum remove docker \
docker-client \
docker-client-latest \
docker-common \
docker-latest \
docker-latest-logrotate \
docker-logrotate \
docker-selinux \
docker-engine-selinux \
docker-engine
Intall Required yum Utilities
yum install -y yum-utils device-mapper-persistent-data lvm2
Setting a yum Repository
Set up a Docker repository:
yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
This will create /etc/yum.repos.d/docker-ce.repo.
Alternatively, the repository file can be added by hand, in /etc/yum.repos.d, with the following content:
[dockerrepo]
name=Docker Repository
baseurl=https://yum.dockerproject.org/repo/main/centos/7
enabled=1
gpgcheck=1
gpgkey=https://yum.dockerproject.org/gpg
Alternative URL for Centos 6: https://yum.dockerproject.org/repo/main/centos/6 Oracle Linux: https://yum.dockerproject.org/repo/main/oraclelinux/6/
This is an example of how to use an "entitled" RH repository:
Restrict Some Releases
yum-config-manager --disable docker-ce-edge yum-config-manager --disable docker-ce-test
RedHat extras
In installed on RedHat, enable the "extras" repository:
yum-config-manager --enable rhel-7-server-extras-rpms
Install
yum install docker-ce
Obsolete:
yum install docker-engine
The yum installation procedure enables the docker server to start at boot:
systemctl is-enabled docker enabled
If not, enable it:
systemctl enable docker
Reboot
docker version Client: Version: 17.03.1-ce API version: 1.27 Go version: go1.7.5 Git commit: c6d412e Built: Fri Mar 24 00:36:45 2017 OS/Arch: linux/amd64 Server: Version: 17.03.1-ce API version: 1.27 (minimum version 1.12) Go version: go1.7.5 Git commit: c6d412e Built: Fri Mar 24 00:36:45 2017 OS/Arch: linux/amd64 Experimental: false
Installation Verification
Docker Installation for OpenShift
Ubuntu
Docker installation on Ubuntu is described here, in order:
- https://docs.docker.com/install/linux/docker-ce/ubuntu/
- https://docs.docker.com/install/linux/linux-postinstall/
A summary is available below. The sequence was used to install 18.03.0-ce on Ubuntu 16.04 xenial.
Setup the repository. As root:
apt-get update apt-get install apt-transport-https ca-certificates curl software-properties-common curl -fsSL https://download.docker.com/linux/ubuntu/gpg | apt-key add - apt-key fingerprint 0EBFCD88 add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
Note that $(lsb_release -cs) should return 'xenial' or equivalent. The last command adds the Docker repository in /etc/apt/sources.list.
Install Docker CE. As root:
Update the package index again after setting up the Docker repository:
apt-get update
Then install the latest docker-ce:
apt-get install docker-ce
Test:
docker run hello-world
At this point, docker info may return a warning:
WARNING: No swap limit support
This is addressed by configuring the kernel appropriately. cgroups and swap should be configured in /etc/default/grub, by adding
GRUB_CMDLINE_LINUX="cgroup_enable=memory swapaccount=1"
and then
update-grub reboot
Start at boot:
systemctl enable docker
Configure a user other than "root" to be able to use the docker client to connect to the server. For details on why we needed to do this see Docker Concepts - Client/Server Communication. The installation procedure should have created the 'docker' group already:
usermod -aG docker <unprivileged-user-to-operate-docker-server>
Test access for unprivileged user. As that user:
docker run hello-world
Inspect storage backend details.
Also run: