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Connection pooler (#799)
Connection pooler support Add support for a connection pooler. The idea is to make it generic enough to be able to switch between different implementations (e.g. pgbouncer or odyssey). Operator needs to create a deployment with pooler and a service for it to access. For connection pool to work properly, a database needs to be prepared by operator, namely a separate user have to be created with an access to an installed lookup function (to fetch credential for other users). This setups is supposed to be used only by robot/application users. Usually a connection pool implementation is more CPU bounded, so it makes sense to create several pods for connection pool with more emphasize on cpu resources. At the moment there are no special affinity or tolerations assigned to bring those pods closer to the database. For availability purposes minimal number of connection pool pods is 2, ideally they have to be distributed between different nodes/AZ, but it's not enforced in the operator itself. Available configuration supposed to be ergonomic and in the normal case require minimum changes to a manifest to enable connection pool. To have more control over the configuration and functionality on the pool side one can customize the corresponding docker image. Co-authored-by: Felix Kunde <felix-kunde@gmx.de>
This commit is contained in:
Dmitry Dolgov
co-authored by
Felix Kunde
Felix Kunde
parent
579f78864b
commit
9dfa433363
@@ -318,6 +318,47 @@ spec:
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pattern: '^(\d+(e\d+)?|\d+(\.\d+)?(e\d+)?[EPTGMK]i?)$'
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scalyr_server_url:
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type: string
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connection_pool:
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type: object
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properties:
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connection_pool_schema:
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type: string
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#default: "pooler"
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connection_pool_user:
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type: string
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#default: "pooler"
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connection_pool_image:
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type: string
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#default: "registry.opensource.zalan.do/acid/pgbouncer"
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connection_pool_max_db_connections:
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type: integer
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#default: 60
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connection_pool_mode:
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type: string
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enum:
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- "session"
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- "transaction"
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#default: "transaction"
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connection_pool_number_of_instances:
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type: integer
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minimum: 2
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#default: 2
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connection_pool_default_cpu_limit:
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type: string
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pattern: '^(\d+m|\d+(\.\d{1,3})?)$'
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#default: "1"
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connection_pool_default_cpu_request:
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type: string
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pattern: '^(\d+m|\d+(\.\d{1,3})?)$'
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#default: "500m"
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connection_pool_default_memory_limit:
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type: string
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pattern: '^(\d+(e\d+)?|\d+(\.\d+)?(e\d+)?[EPTGMK]i?)$'
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#default: "100Mi"
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connection_pool_default_memory_request:
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type: string
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pattern: '^(\d+(e\d+)?|\d+(\.\d+)?(e\d+)?[EPTGMK]i?)$'
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#default: "100Mi"
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status:
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type: object
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additionalProperties:
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@@ -106,6 +106,55 @@ spec:
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uid:
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format: uuid
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type: string
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connectionPool:
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type: object
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properties:
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dockerImage:
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type: string
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maxDBConnections:
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type: integer
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mode:
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type: string
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enum:
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- "session"
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- "transaction"
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numberOfInstances:
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type: integer
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minimum: 2
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resources:
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type: object
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required:
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- requests
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- limits
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properties:
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limits:
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type: object
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required:
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- cpu
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- memory
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properties:
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cpu:
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type: string
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pattern: '^(\d+m|\d+(\.\d{1,3})?)$'
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memory:
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type: string
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pattern: '^(\d+(e\d+)?|\d+(\.\d+)?(e\d+)?[EPTGMK]i?)$'
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requests:
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type: object
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required:
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- cpu
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- memory
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properties:
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cpu:
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type: string
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pattern: '^(\d+m|\d+(\.\d{1,3})?)$'
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memory:
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type: string
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pattern: '^(\d+(e\d+)?|\d+(\.\d+)?(e\d+)?[EPTGMK]i?)$'
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schema:
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type: string
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user:
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type: string
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databases:
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type: object
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additionalProperties:
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@@ -113,6 +162,8 @@ spec:
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# Note: usernames specified here as database owners must be declared in the users key of the spec key.
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dockerImage:
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type: string
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enableConnectionPool:
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type: boolean
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enableLogicalBackup:
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type: boolean
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enableMasterLoadBalancer:
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@@ -128,6 +128,7 @@ rules:
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- apps
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resources:
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- statefulsets
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- deployments
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verbs:
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- create
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- delete
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@@ -20,4 +20,5 @@ data:
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{{ toYaml .Values.configDebug | indent 2 }}
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{{ toYaml .Values.configLoggingRestApi | indent 2 }}
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{{ toYaml .Values.configTeamsApi | indent 2 }}
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{{ toYaml .Values.configConnectionPool | indent 2 }}
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{{- end }}
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@@ -34,4 +34,6 @@ configuration:
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{{ toYaml .Values.configLoggingRestApi | indent 4 }}
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scalyr:
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{{ toYaml .Values.configScalyr | indent 4 }}
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connection_pool:
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{{ toYaml .Values.configConnectionPool | indent 4 }}
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{{- end }}
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@@ -267,6 +267,25 @@ configScalyr:
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# Memory request value for the Scalyr sidecar
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scalyr_memory_request: 50Mi
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configConnectionPool:
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# db schema to install lookup function into
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connection_pool_schema: "pooler"
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# db user for pooler to use
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connection_pool_user: "pooler"
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# docker image
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connection_pool_image: "registry.opensource.zalan.do/acid/pgbouncer"
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# max db connections the pooler should hold
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connection_pool_max_db_connections: 60
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# default pooling mode
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connection_pool_mode: "transaction"
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# number of pooler instances
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connection_pool_number_of_instances: 2
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# default resources
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connection_pool_default_cpu_request: 500m
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connection_pool_default_memory_request: 100Mi
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connection_pool_default_cpu_limit: "1"
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connection_pool_default_memory_limit: 100Mi
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rbac:
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# Specifies whether RBAC resources should be created
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create: true
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@@ -243,6 +243,26 @@ configTeamsApi:
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# URL of the Teams API service
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# teams_api_url: http://fake-teams-api.default.svc.cluster.local
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# configure connection pooler deployment created by the operator
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configConnectionPool:
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# db schema to install lookup function into
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connection_pool_schema: "pooler"
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# db user for pooler to use
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connection_pool_user: "pooler"
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# docker image
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connection_pool_image: "registry.opensource.zalan.do/acid/pgbouncer"
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# max db connections the pooler should hold
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connection_pool_max_db_connections: 60
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# default pooling mode
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connection_pool_mode: "transaction"
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# number of pooler instances
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connection_pool_number_of_instances: 2
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# default resources
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connection_pool_default_cpu_request: 500m
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connection_pool_default_memory_request: 100Mi
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connection_pool_default_cpu_limit: "1"
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connection_pool_default_memory_limit: 100Mi
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rbac:
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# Specifies whether RBAC resources should be created
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create: true
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