Set up the repository¶

You only need to set up the repository once, after which you can install MCR from the repository and upgrade as needed. MCR supports the latest version of CentOS 64-bit running on x86_64.

Note

MCR supports the overlay2 storage drivers on CentOS. The following limitations apply:

If you enable selinux, MCR supports overlay2 on CentoOS 7.4 and higher.
If you disable selinux, MCR supports overlay2 on CentOS 7.2 and higher, with kernel version 3.10.0-693 and higher.

Remove any existing Docker repositories from /etc/yum.repos.d/:
```
sudo rm /etc/yum.repos.d/docker*.repo
```
Store https://repos.mirantis.com in an environment variable:
```
export DOCKERURL="https://repos.mirantis.com"
```

Store the value of DOCKERURL using a yum variable in /etc/yum/vars/:

sudo -E sh -c \
'echo "$DOCKERURL/centos" > /etc/yum/vars/dockerurl'

Store your operating system version string in /etc/yum/vars/dockerosversion:
```
sudo sh -c 'echo "<version>" > /etc/yum/vars/dockerosversion'
```
Install the yum-utils that provides the yum-config-manager utility:
```
sudo yum install -y yum-utils
```

Enable the extras RHEL repository to ensure access to the container-selinux package that docker-ee requires:

All architectures except IBM Power

sudo yum-config-manager --enable rhel-7-server-extras-rpms

IBM Power only (little-endian)

sudo yum-config-manager --enable extras
sudo subscription-manager repos \
--enable=rhel-7-for-power-le-extras-rpms
sudo yum makecache fast
sudo yum -y install container-selinux

AWS and Azure require that you enable another repository:

AWS

sudo yum install -y rh-amazon-rhui-client
sudo yum-config-manager --enable rhui-REGION-rhel-server-extras

Note that REGION is a literal. It does not represent the region your machine is running in.

Azure

sudo yum-config-manager --enable rhui-rhel-7-server-rhui-extras-rpms

Add the stable MCR repository:

sudo -E yum-config-manager \
--add-repo "$DOCKERURL/centos/docker-ee.repo"