Ways of migrating OpenShift 3 to 4

With OpenShift 3 reaching soon its end-of-life, businesses must consider migrating their clusters to the latest and greatest version. In this talk we will review the most common ways to migrate clusters from OpenShift 3 to version 4.

Transcript

1. APPUiO – Swiss Container Pla orm Adrian Kosmaczewski – Developer Rela ons Migra ng from OpenShi 3 to 4 1
2. APPUiO – Swiss Container Pla orm   2
3. APPUiO – Swiss Container Pla orm Migra ng clusters from OpenShi 3 to 4 Common gotchas More informa on 3
4. APPUiO – Swiss Container Pla orm OpenShi 3.11 end of full support ⇒ New features! Watch out for architectural changes! Why Migra ng to OpenShi 4? June 2021 4
5. APPUiO – Swiss Container Pla orm Simpler installa on process Immutable infrastructure RHCOS for control planes Operators Serverless Service Mesh Easier management New Features in OpenShi 4 5
6. APPUiO – Swiss Container Pla orm 1. Start & configure new OpenShi 4 cluster 2. Create a migra on plan 3. Execute said migra on plan 4. Point DNS to new cluster 5. Profit! $£¥€¢ How to Migrate? 6
7. APPUiO – Swiss Container Pla orm Adrian Kosmaczewski – Developer Rela ons – Thanks for A ending! adrian@vshn.ch 7
8. APPUiO – Swiss Container Pla orm Sorry! Not done yet 8
9. APPUiO – Swiss Container Pla orm Storage Gluster Storage in 3.11 → RH Ceph Storage in 4 GlusterFS no longer supported Standalone CephFS no longer supported Standalone Ceph RBD no longer supported Crea ng a Migra on Plan 1/3 9
10. APPUiO – Swiss Container Pla orm Networking Isola on mode: ovs-subnet → NetworkPolicy NetworkPolicy similar to OpenShi 3’s ovs-multitenant Crea ng a Migra on Plan 2/3 10
11. APPUiO – Swiss Container Pla orm Logging Security Monitoring Crea ng a Migra on Plan 2/3 11
12. APPUiO – Swiss Container Pla orm Source cluster must be 3.7, 3.9, 3.10 or 3.11 cluster-admin privileges on all clusters Unrestricted network access to replica on repository Migra on controller has access to all other clusters Health check! Migra on Plan Prerequisites Podman 12
13. APPUiO – Swiss Container Pla orm Cluster Applica on Migra on operator (CAM) Control Plane Migra on Assistance Tool (CPMA) Migra on Toolkit for Containers operator (MTC) Helper Tools by Red Hat 1/2 13
14. APPUiO – Swiss Container Pla orm Cluster Application Migration Application Workloads Control Plane Configuration Control Plane Migration Assistance Helper Tools by Red Hat 2/2 14
15. APPUiO – Swiss Container Pla orm Helper Tools by Third Par es K8up operator Appranix SRA operator Portworx PX-Backup pvc-migrate imagestream-migrate 15
16. APPUiO – Swiss Container Pla orm : Source docs.openshi .com 16
17. APPUiO – Swiss Container Pla orm CAM Demo 0:00 / 3:16 www.youtube.com/watch?v=WfukMDIWTXA 17
18. APPUiO – Swiss Container Pla orm Per applica on "Big Bang" Migrate all apps Point DNS to new OpenShi 4 cluster Migra on Strategies 18
19. APPUiO – Swiss Container Pla orm Storage classes Gluster ⇒ RH Ceph Operators Pervasive usage Maybe start using OpenShi 4 operators instead? Gotchas 1/2 19
20. APPUiO – Swiss Container Pla orm DeploymentConfig ⇒ Deployment Only use DeploymentConfig if you need Automa c rollbacks, Triggers, Lifecycle hooks, Custom strategies Down me Load balancer between both clusters as mi ga on DNS considera ons Fine tuning and tes ng! Gotchas 2/2 20
21. APPUiO – Swiss Container Pla orm Red Hat More Informa on 1/2 OpenShi 3.x life cycle policies Migra on home page About migra ng OpenShi 3 to 4 Planning Performing Best prac ces guide 21
22. APPUiO – Swiss Container Pla orm Third-party tools More Informa on 2/2 K8up backup operator Blog post about Appranix Blog post about PX-Backup to migrate pvc-migrate imagestream-migrate 22
23. APPUiO – Swiss Container Pla orm Adrian Kosmaczewski – Developer Rela ons – VSHN AG – Neugasse 10 – CH-8005 Zürich – +41 44 545 53 00 – – Thanks! adrian@vshn.ch vshn.ch info@vshn.ch 23