Chapter 5. Migrating a non-containerized Red Hat Ceph Storage cluster to a containerized environment
To manually migrate a non-containerized, bare-metal, Red Hat Ceph Storage cluster to a containerized environment, use the ceph-ansible switch-from-non-containerized-to-containerized-ceph-daemons.yml playbook.
If the storage cluster has an RBD mirror daemon not deployed by ceph-ansible, you need to migrate the daemons prior to converting to a containerized cluster. For more details, see Migrating RBD mirroring daemons.
Prerequisites
- A running Red Hat Ceph Storage non-containerized, bare-metal, cluster.
- Access to the Ansible administration node.
- An ansible user account.
- Sudo access to the ansible user account.
Procedure
Edit the
group_vars/all.ymlfile to include configuration for containers:ceph_docker_image_tag: "latest" ceph_docker_image: rhceph/rhceph-4-rhel8 containerized_deployment: true ceph_docker_registry: registry.redhat.io
ImportantFor the
ceph_docker_image_tag, uselatestif your current storage cluster is on latest version or use the appropriate image tag. See the What are the Red Hat Ceph Storage releases and corresponding Ceph package versions? for more information.Navigate to the
/usr/share/ceph-ansibledirectory:[ansible@admin ~]$ cd /usr/share/ceph-ansible
On the Ansible administration node, run the Ansible migration playbook:
Syntax
ansible-playbook ./infrastructure-playbooks/switch-from-non-containerized-to-containerized-ceph-daemons.yml -i INVENTORY_FILEExample
[ansible@admin ceph-ansible]$ ansible-playbook ./infrastructure-playbooks/switch-from-non-containerized-to-containerized-ceph-daemons.yml -i hosts
Verify the cluster is switched to containerized environment.
On the monitor node, list all running containers:
Red Hat Enterprise Linux 7
[root@mon ~]$ sudo docker ps
Red Hat Enterprise Linux 8
[root@mon ~]$ sudo podman ps
Additional Resources
- See the Installing a Red Hat Ceph Storage cluster chapter in the Red Hat Ceph Storage Installation Guide for information on installation of a bare-metal storage cluster.
-
See the Creating an Ansible user with sudo access section in the Red Hat Ceph Storage Installation Guide for providing
sudoaccess to the ansible user. - See the Configuring two-way mirroring using the command-line interface section in the Red Hat Ceph Storage Block Device Guide for more details.
