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
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2. APPUiO – Swiss Container Pla orm
    
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3. APPUiO – Swiss Container Pla orm
   Migra ng clusters from OpenShi 3 to 4
   Common gotchas
   More informa on
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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
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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
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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?
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7. APPUiO – Swiss Container Pla orm
   Adrian Kosmaczewski – Developer Rela ons –
   Thanks for A ending!
   adrian@vshn.ch
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8. APPUiO – Swiss Container Pla orm
   Sorry! Not done yet
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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
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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
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11. APPUiO – Swiss Container Pla orm
    Logging
    Security
    Monitoring
    Crea ng a Migra on Plan 2/3
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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
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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
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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
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15. APPUiO – Swiss Container Pla orm
    Helper Tools by Third Par es
    K8up operator
    Appranix SRA operator
    Portworx PX-Backup
    pvc-migrate
    imagestream-migrate
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16. APPUiO – Swiss Container Pla orm
    :
    Source docs.openshi .com
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17. APPUiO – Swiss Container Pla orm
    CAM Demo
    0:00 / 3:16
    www.youtube.com/watch?v=WfukMDIWTXA
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18. APPUiO – Swiss Container Pla orm
    Per applica on
    "Big Bang"
    Migrate all apps
    Point DNS to new OpenShi 4 cluster
    Migra on Strategies
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19. APPUiO – Swiss Container Pla orm
    Storage classes
    Gluster ⇒ RH Ceph
    Operators
    Pervasive usage
    Maybe start using OpenShi 4 operators instead?
    Gotchas 1/2
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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
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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
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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
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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
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