Re: [keycloak-user] Behavior of Keycloak when performing an upgrade.
On 19/04/17 19:38, Reed Lewis wrote:
We are planning on implementing Keycloak with a very large dataset of
users (in excess of 5 to 10 million). We are going to have a single SQL datastore
running in Azure, with multiple keycloak servers pointing to that single datastore. The
question that is being asked is what happens when we wish to upgrade keycloak from version
xx to version yy (whatever the versions are I do not know). The questions are:
1. If the schema changes does Keycloak automatically handle that?
Yes, it
should. We use Liquibase under the hood to migrate DB schema and
data automatically. However it's highly recommended to backup your
database before upgrade Keycloak. DB migration is always a bit tricky
and bad things could happen ;)
2. If there is schema changes, how long will that process take?
Depends what
exactly was changed in the schema. For example if there is
just one minor change in the table REALM and you have just 1 realm, it
will be very fast. On the other hand change in the table related to USER
data (for example removing foreign key and creating new foreign key)
might be more tricky considering size of your DB.
3. If there is no schema change can I shut down everything but one server, then
shutdown the last one and start immediately a new one with the new software version?
Yes. See our Migration guide for more details. We usually provide some
versions specific migration instructions in case there is some important
manual migration step, which is needed to be done between migration from
version X to version Y.
Marek
So bottom line: What is the upgrade path for Keycloak for major version to major version
or minor to minor or whatever?
Reed
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