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[postgresql-ha] Use pgpool service as db connection proxy (#542) 

### Description of the change

The `postgresql-ha` provides a dedicated deployment and service called `pgpool`. This application is a proxy that routes the db queries to the active database replica. There's a note about that in their README[^1].

Issue #502 is a side-effect of not using that proxy.

### Possible drawbacks

Using the Charts' default configuration, the `pgpool` deployment has 1 replica, making this a single-point of failure. But users can change the related `postgresql-ha.pgpool.replicaCount` to their needs.

### Applicable issues

- fixes #502

### Checklist

- [x] Templating unittests are added

[^1]: https://github.com/bitnami/charts/blob/main/bitnami/postgresql-ha/templates/postgresql/statefulset.yaml#introduction

Reviewed-on: https://gitea.com/gitea/helm-chart/pulls/542
Reviewed-by: pat-s <pat-s@noreply.gitea.com>
Co-authored-by: justusbunsi <sk.bunsenbrenner@gmail.com>
Co-committed-by: justusbunsi <sk.bunsenbrenner@gmail.com>
This commit is contained in:
justusbunsi 2023-10-14 16:05:59 +00:00 committed by pat-s
parent 0cc8c6d558
commit b68b9d91cf
3 changed files with 61 additions and 1 deletions
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2
templates/_helpers.tpl
View File

@ -119,7 +119,7 @@ app.kubernetes.io/instance: {{ .Release.Name }}
{{- define "postgresql-ha.dns" -}}
{{- if (index .Values "postgresql-ha").enabled -}}
{{- printf "%s-postgresql-ha-postgresql.%s.svc.%s:%g" .Release.Name .Release.Namespace .Values.clusterDomain (index .Values "postgresql-ha" "service" "ports" "postgresql") -}}
{{- printf "%s-postgresql-ha-pgpool.%s.svc.%s:%g" .Release.Name .Release.Namespace .Values.clusterDomain (index .Values "postgresql-ha" "service" "ports" "postgresql") -}}
{{- end -}}
{{- end -}}

30
unittests/config/database-section_postgresql-ha.yaml Normal file
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@ -0,0 +1,30 @@
suite: config template | database section (postgresql-ha)
release:
name: gitea-unittests
namespace: testing
tests:
- it: connects to pgpool service
template: templates/gitea/config.yaml
set:
postgresql:
enabled: false
postgresql-ha:
enabled: true
asserts:
- documentIndex: 0
matchRegex:
path: stringData.database
pattern: HOST=gitea-unittests-postgresql-ha-pgpool.testing.svc.cluster.local:5432
- it: renders the referenced service
template: charts/postgresql-ha/templates/pgpool/service.yaml
set:
postgresql:
enabled: false
postgresql-ha:
enabled: true
asserts:
- containsDocument:
kind: Service
apiVersion: v1
name: gitea-unittests-postgresql-ha-pgpool
namespace: testing

30
unittests/config/database-section_postgresql.yaml Normal file
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@ -0,0 +1,30 @@
suite: config template | database section (postgresql)
release:
name: gitea-unittests
namespace: testing
tests:
- it: "connects to postgresql service"
template: templates/gitea/config.yaml
set:
postgresql:
enabled: true
postgresql-ha:
enabled: false
asserts:
- documentIndex: 0
matchRegex:
path: stringData.database
pattern: HOST=gitea-unittests-postgresql.testing.svc.cluster.local:5432
- it: "renders the referenced service"
template: charts/postgresql/templates/primary/svc.yaml
set:
postgresql:
enabled: true
postgresql-ha:
enabled: false
asserts:
- containsDocument:
kind: Service
apiVersion: v1
name: gitea-unittests-postgresql
namespace: testing