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Chapter 4. Downgrading OpenShift

4.1. Overview
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Following an OpenShift Enterprise upgrade, it may be desirable in extreme cases to downgrade your cluster to a previous version. The following sections outline the required steps for each system in a cluster to perform such a downgrade for the OpenShift Enterprise 3.2 to 3.1 downgrade path.

Warning

These steps are currently only supported for RPM-based installations of OpenShift Enterprise and assumes downtime of the entire cluster.

Important

For the OpenShift Enterprise 3.1 to 3.0 downgrade path, see the OpenShift Enterprise 3.1 documentation, which has modified steps.

4.2. Verifying Backups
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The Ansible playbook used during the upgrade process should have created a backup of the master-config.yaml file and the etcd data directory. Ensure these exist on your masters and etcd members: 

/etc/origin/master/master-config.yaml.<timestamp>
/var/lib/origin/etcd-backup-<timestamp>
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Also, back up the node-config.yaml file on each node (including masters, which have the node component on them) with a timestamp: 

/etc/origin/node/node-config.yaml.<timestamp>
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If you use a separate etcd cluster instead of a single embedded etcd instance, the backup is likely created on all etcd members, though only one is required for the recovery process. You can run a separate etcd instance that is co-located with your master nodes.

The RPM downgrade process in a later step should create .rpmsave backups of the following files, but it may be a good idea to keep a separate copy regardless: 

/etc/sysconfig/atomic-openshift-master
/etc/etcd/etcd.conf
1
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1
Only required if using a separate etcd cluster.

4.3. Shutting Down the Cluster
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On all masters, nodes, and etcd members, if you use a separate etcd cluster that runs on different nodes, ensure the relevant services are stopped.

On the master in a single master cluster: 

# systemctl stop atomic-openshift-master
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On each master in a multi-master cluster: 

# systemctl stop atomic-openshift-master-api
# systemctl stop atomic-openshift-master-controllers
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On all master and node hosts: 

# systemctl stop atomic-openshift-node
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On any etcd hosts for a separate etcd cluster: 

# systemctl stop etcd
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4.4. Removing RPMs
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On all masters, nodes, and etcd members, if you use a separate etcd cluster that runs on different nodes, remove the following packages: 

# yum remove atomic-openshift \
    atomic-openshift-clients \
    atomic-openshift-node \
    atomic-openshift-master \
    openvswitch \
    atomic-openshift-sdn-ovs \
    tuned-profiles-atomic-openshift-node
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If you use a separate etcd cluster, also remove the etcd package: 

# yum remove etcd
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If using the embedded etcd, leave the etcd package installed. It is required for running the etcdctl command to issue operations in later steps.

4.5. Downgrading Docker
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OpenShift Enterprise 3.2 requires Docker 1.9.1 and also supports Docker 1.10.3, however OpenShift Enterprise 3.1 requires Docker 1.8.2.

Downgrade to Docker 1.8.2 on each host using the following steps:

  1. Remove all local containers and images on the host. Any pods backed by a replication controller will be recreated.

    Warning

    The following commands are destructive and should be used with caution.

    Delete all containers: 

    # docker rm $(docker ps -a -q)
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    Delete all images: 

    # docker rmi $(docker images -q)
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  2. Use yum swap (instead of yum downgrade) to install Docker 1.8.2: 

    # yum swap docker-* docker-*1.8.2
# sed -i 's/--storage-opt dm.use_deferred_deletion=true//' /etc/sysconfig/docker-storage
# systemctl restart docker
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  3. You should now have Docker 1.8.2 installed and running on the host. Verify with the following: 

    # docker version
Client:
 Version:      1.8.2-el7
 API version:  1.20
 Package Version: docker-1.8.2-10.el7.x86_64
[...]

# systemctl status docker
● docker.service - Docker Application Container Engine
   Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled; vendor preset: disabled)
   Active: active (running) since Mon 2016-06-27 15:44:20 EDT; 33min ago
[...]
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4.6. Reinstalling RPMs
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Disable the OpenShift Enterprise 3.3 repositories, and re-enable the 3.2 repositories: 

# subscription-manager repos \
    --disable=rhel-7-server-ose-3.3-rpms \
    --enable=rhel-7-server-ose-3.2-rpms
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On each master, install the following packages: 

# yum install atomic-openshift \
    atomic-openshift-clients \
    atomic-openshift-node \
    atomic-openshift-master \
    openvswitch \
    atomic-openshift-sdn-ovs \
    tuned-profiles-atomic-openshift-node
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On each node, install the following packages: 

# yum install atomic-openshift \
    atomic-openshift-node \
    openvswitch \
    atomic-openshift-sdn-ovs \
    tuned-profiles-atomic-openshift-node
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If you use a separate etcd cluster, install the following package on each etcd member: 

# yum install etcd
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4.7. Restoring etcd
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See Backup and Restore.

4.8. Bringing OpenShift Enterprise Services Back Online
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See Backup and Restore.

4.9. Verifying the Downgrade
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To verify the downgrade, first check that all nodes are marked as Ready: 

# oc get nodes
NAME                        STATUS                     AGE
master.example.com          Ready,SchedulingDisabled   165d
node1.example.com           Ready                      165d
node2.example.com           Ready                      165d
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Then, verify that you are running the expected versions of the docker-registry and router images, if deployed: 

# oc get -n default dc/docker-registry -o json | grep \"image\"
    "image": "openshift3/ose-docker-registry:v3.1.1.6",
# oc get -n default dc/router -o json | grep \"image\"
    "image": "openshift3/ose-haproxy-router:v3.1.1.6",
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You can use the diagnostics tool on the master to look for common issues and provide suggestions. In OpenShift Enterprise 3.1, the oc adm diagnostics tool is available as openshift ex diagnostics: 

# openshift ex diagnostics
...
[Note] Summary of diagnostics execution:
[Note] Completed with no errors or warnings seen.
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