* Track origin of roles.
* Propagate changes on infrastructure roles to corresponding secrets.
When the password in the infrastructure role is updated, re-generate the
secret for that role.
Previously, the password for an infrastructure role was always fetched from
the secret, making any updates to such role a no-op after the corresponding
secret had been generated.
There used to be a masterLess flag that was supposed to indicate whether the cluster it belongs to runs without the acting master by design. At some point, as we didn't really have support for such clusters, the flag has been misused to indicate there is no master in the cluster. However, that was not done consistently (a cluster without all pods running would never be masterless, even when the master is not among the running pods) and it was based on the wrong assumption that the masterless cluster will remain masterless until the next attempt to change that flag, ignoring the possibility of master coming up or some node doing a successful promotion. Therefore, this PR gets rid of that flag completely.
When the cluster is running with 0 instances, there is obviously no master and it makes no sense to create any database objects inside the non-existing master. Therefore, this PR introduces an additional check for that.
recreatePods were assuming that the roles of the pods recorded when the function has stared will not change; for instance, terminated replica pods should start as replicas. Revisit that assumption by looking at the actual role of the re-spawned pods; that avoids a failover if some replica has promoted to the master role while being re-spawned. In addition, if the failover from the old master was unsuccessful, we used to stop and leave the old master running on an old pod, without recording this fact anywhere. This PR makes the failover failure emit a warning, but not stop recreating the last master pod; in the worst case, the running master will be terminated, however, this case is rather unlikely one.
As a side effect, make waitForPodLabel return the pod definition it waited for, avoiding extra API calls in recreatePods and movePodFromEndOfLifeNode
Introduce a new lock called specMu lock to protect the cluster spec.
This lock is held on update and sync, and when retrieving the spec in
the API code. There is no need to acquire it for cluster creation and
deletion: creation assigns the spec to the cluster before linking it to
the controller, and deletion just removes the cluster from the list in
the controller, both holding the global clustersMu Lock.
* Scalyr agent sidecar for log shipping
* Remove the default for the Scalyr image
Now the image needs to be specified explicitly to enable log shipping to
Scalyr. This removes the problem of having to generate the config file
or publish our agent image repository.
* Add configuration variable for Scalyr server URL
Defaults to the EU address.
* Alter style
Newlines are cheap and make code easier to edit/refactor, but ok.
* Fix StatefulSet comparison logic
I broke it when I made the comparison consider all containers in the
PostgreSQL pod.
* Make sure the statefulset that is deleted manually gets re-created.
Per report and analysis by Manuel Gomez.
* Move the existence checks for other objects out of the Create functions.
create{Object} for services, endpoints and PDBs refused to continue if
there is a cached definition in the cluster, however, the only place
where it makes sense is when creating a new cluster. Note that contrary
to the statefulset this doesn't fix any issues, since those definitions
were nullified correspondingly when the sync code detected there is no
object present in the Kubernetes cluster.
- make sure that the secrets for the system users (superuser, replication)
are not deleted when the main cluster is. Therefore, we can re-create
the cluster, potentially forcing Patroni to restore it from the backup
and enable Patroni to connect, since it will use the old password, not
the newly generated random one.
- when syncing users, always check whether they are already in the DB.
Previously, we did this only for the sync cluster case, but the new
cluster could be actually the one restored from the backup by Patroni,
having all or some of the users already in place.
- delete endponts last. Patroni uses the $clustername endpoint in order
to store the leader related metadata. If we remove it before removing
all pods, one of those pods running Patroni will re-create it and the
next attempt to create the cluster with the same name will stuble on
the existing endpoint.
- Use db.Exec instead of db.Query for queries that expect no result.
This also fixes the issue with the DB creation, since we didn't
release an empty Row object it was not possible to create more than
one database for a cluster.
* Avoid overwriting critical users.
Disallow defining new users either in the cluster manifest, teams
API or infrastructure roles with the names mentioned in the new
protected_role_names parameter (list of comma-separated names)
Additionally, forbid defining a user with the name matching either
super_username or replication_username, so that we don't overwrite
system roles required for correct working of the operator itself.
Also, clear PostgreSQL roles on each sync first in order to avoid using
the old definitions that are no longer present in the current manifest,
infrastructure roles secret or the teams API.
When a role is defined in the infrastructure roles and the cluster
manifest use the infrastructure role definition and add flags
defined in the manifest.
Previously the role has been overwritten by the definition from the
manifest. Because a random password is generated for each role from the
manifest the applications relying on the infrastructure role credentials
from the infrastructure roles secret were unable to connect.
Add options to the PgUser structure, potentially allowing to set
per-role options in the cluster definition as well.
Introduce api_roles_configuration operator option with the default
of log_statement=all
- Call comparison function in the case of the sync as well as for update
- Include full cluster name in PDB name
- Assign cluster labels to the PDB object
Open and close DB connections on-demand.
Previously, we used to leave the DB connection open while the
cluster was registered with the operator, potentially resutling
in dangled connections if the operator terminates abnormally.
Small refactoring around the role syncing code.
* client-go v4.0.0-beta0
* remove unnecessary methods for tpr object
* rest client: use interface instead of structure pointer
* proper names for constants; some clean up for log messages
* remove teams api client from controller and make it per cluster
Sergey Dudoladov
Oleksii Kliukin
Dmitrii Dolgov
Manuel Gómez
Oleksii Kliukin
Murat Kabilov
Jan Mussler