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Chapter 11. Recover from an out-of-sync passive site

This chapter describes the procedures required to synchronize the secondary site with the primary site in a setup as outlined in Concepts for active-passive deployments together with the blueprints outlined in Building blocks active-passive deployments.

11.1. When to use procedure

Use this after a temporary disconnection between sites where Data Grid was disconnected and the contents of the caches are out-of-sync.

At the end of the procedure, the session contents on the secondary site have been discarded and replaced by the session contents of the primary site. All caches in the secondary site have been cleared to prevent invalid cached contents.

See the Multi-site deployments chapter for different operational procedures.

11.2. Procedures

11.2.1. Data Grid Cluster

For the context of this chapter, Site-A is the primary site and is active, and Site-B is the secondary site and is passive.

Network partitions may happen between the site and the replication between the Data Grid cluster will stop. These procedures bring both sites back in sync.

Warning

Transferring the full state may impact the Data Grid cluster performance by increasing the response time and/or resources usage.

The first procedure is to delete the stale data from the secondary site.

  1. Login into your secondary site.

  2. Shutdown Red Hat build of Keycloak. This will clear all Red Hat build of Keycloak caches, and it prevents the state of Red Hat build of Keycloak from being out-of-sync with Data Grid.

    When deploying Red Hat build of Keycloak using the Red Hat build of Keycloak Operator, change the number of Red Hat build of Keycloak instances in the Red Hat build of Keycloak Custom Resource to 0.

  3. Connect into Data Grid Cluster using the Data Grid CLI tool:

    Command:

    oc -n keycloak exec -it pods/infinispan-0 -- ./bin/cli.sh --trustall --connect https://127.0.0.1:11222

    It asks for the username and password for the Data Grid cluster. Those credentials are the one set in the Deploy Data Grid for HA with the Data Grid Operator chapter in the configuring credentials section.

    Output:

    Username: developer
Password:
[infinispan-0-29897@ISPN//containers/default]>

    Note

    The pod name depends on the cluster name defined in the Data Grid CR. The connection can be done with any pod in the Data Grid cluster.

  4. Disable the replication from secondary site to the primary site by running the following command. It prevents the clear request to reach the primary site and delete all the correct cached data.

    Command:

    site take-offline --all-caches --site=site-a

    Output:

    {
  "offlineClientSessions" : "ok",
  "authenticationSessions" : "ok",
  "sessions" : "ok",
  "clientSessions" : "ok",
  "work" : "ok",
  "offlineSessions" : "ok",
  "loginFailures" : "ok",
  "actionTokens" : "ok"
}

  5. Check the replication status is offline.

    Command:

    site status --all-caches --site=site-a

    Output:

    {
  "status" : "offline"
}

    If the status is not offline, repeat the previous step.

    Warning

    Make sure the replication is offline otherwise the clear data will clear both sites.

  6. Clear all the cached data in secondary site using the following commands:

    Command:

    clearcache actionTokens
clearcache authenticationSessions
clearcache clientSessions
clearcache loginFailures
clearcache offlineClientSessions
clearcache offlineSessions
clearcache sessions
clearcache work

    These commands do not print any output.

  7. Re-enable the cross-site replication from secondary site to the primary site.

    Command:

    site bring-online --all-caches --site=site-a

    Output:

    {
  "offlineClientSessions" : "ok",
  "authenticationSessions" : "ok",
  "sessions" : "ok",
  "clientSessions" : "ok",
  "work" : "ok",
  "offlineSessions" : "ok",
  "loginFailures" : "ok",
  "actionTokens" : "ok"
}

  8. Check the replication status is online.

    Command:

    site status --all-caches --site=site-a

    Output:

    {
  "status" : "online"
}

Now we are ready to transfer the state from the primary site to the secondary site.

  1. Login into your primary site

  2. Connect into Data Grid Cluster using the Data Grid CLI tool:

    Command:

    oc -n keycloak exec -it pods/infinispan-0 -- ./bin/cli.sh --trustall --connect https://127.0.0.1:11222

    It asks for the username and password for the Data Grid cluster. Those credentials are the one set in the Deploy Data Grid for HA with the Data Grid Operator chapter in the configuring credentials section.

    Output:

    Username: developer
Password:
[infinispan-0-29897@ISPN//containers/default]>

    Note

    The pod name depends on the cluster name defined in the Data Grid CR. The connection can be done with any pod in the Data Grid cluster.

  3. Trigger the state transfer from the primary site to the secondary site.

    Command:

    site push-site-state --all-caches --site=site-b

    Output:

    {
  "offlineClientSessions" : "ok",
  "authenticationSessions" : "ok",
  "sessions" : "ok",
  "clientSessions" : "ok",
  "work" : "ok",
  "offlineSessions" : "ok",
  "loginFailures" : "ok",
  "actionTokens" : "ok"
}

  4. Check the replication status is online for all caches.

    Command:

    site status --all-caches --site=site-b

    Output:

    {
  "status" : "online"
}

  5. Wait for the state transfer to complete by checking the output of push-site-status command for all caches.

    Command:

    site push-site-status --cache=actionTokens
site push-site-status --cache=authenticationSessions
site push-site-status --cache=clientSessions
site push-site-status --cache=loginFailures
site push-site-status --cache=offlineClientSessions
site push-site-status --cache=offlineSessions
site push-site-status --cache=sessions
site push-site-status --cache=work

    Output:

    {
  "site-b" : "OK"
}
{
  "site-b" : "OK"
}
{
  "site-b" : "OK"
}
{
  "site-b" : "OK"
}
{
  "site-b" : "OK"
}
{
  "site-b" : "OK"
}
{
  "site-b" : "OK"
}
{
  "site-b" : "OK"
}

    Check the table in this section for the Cross-Site Documentation for the possible status values.

    If an error is reported, repeat the state transfer for that specific cache.

    Command:

    site push-site-state --cache=<cache-name> --site=site-b

  6. Clear/reset the state transfer status with the following command

    Command:

    site clear-push-site-status --cache=actionTokens
site clear-push-site-status --cache=authenticationSessions
site clear-push-site-status --cache=clientSessions
site clear-push-site-status --cache=loginFailures
site clear-push-site-status --cache=offlineClientSessions
site clear-push-site-status --cache=offlineSessions
site clear-push-site-status --cache=sessions
site clear-push-site-status --cache=work

    Output:

    "ok"
"ok"
"ok"
"ok"
"ok"
"ok"
"ok"
"ok"

As now the state is available in the secondary site, Red Hat build of Keycloak can be started again:

  1. Login into your secondary site.

  2. Startup Red Hat build of Keycloak.

    When deploying Red Hat build of Keycloak using the Red Hat build of Keycloak Operator, change the number of Red Hat build of Keycloak instances in the Red Hat build of Keycloak Custom Resource to the original value.

11.2.2. AWS Aurora Database

No action required.

11.2.3. Route53

No action required.

11.3. Further reading

See Concepts to automate Data Grid CLI commands on how to automate Infinispan CLI commands.

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