README.md

cluster

Warning

This chart is under active development.

Advised caution when using in production!

A note on the chart's purpose

This is an opinionated chart that is designed to provide a subset of simple, stable and safe configurations using the CloudNativePG operator. It is designed to provide a simple way to perform recovery operations to decrease your RTO.

It is not designed to be a one size fits all solution. If you need a more complicated setup we strongly recommend that you either:

• use the operator directly
• create your own chart
• use Kustomize to modify the chart's resources

Note that the latter option carries it's own risks as the chart configuration may change, especially before it reaches a stable release.

That being said, we welcome PRs that improve the chart, but please keep in mind that we don't plan to support every single configuration that the operator provides and we may reject PRs that add too much complexity and maintenance difficulty to the chart.

Getting Started

Installing the Operator

Skip this step if the CNPG operator is already installed in your cluster.

helm repo add cnpg https://cloudnative-pg.github.io/charts
helm upgrade --install cnpg \
--namespace cnpg-system \
--create-namespace \
cnpg/cloudnative-pg

Setting up a CNPG Cluster

helm repo add cnpg https://cloudnative-pg.github.io/charts
helm upgrade --install cnpg \
--namespace cnpg-database \
--create-namespace \
--values values.yaml \
cnpg/cluster

A more detailed guide can be found in the Getting Started docs.

Cluster Configuration

Database types

Currently the chart supports two database types. These are configured via the type parameter. These are:

• postgresql - A standard PostgreSQL database.
• postgis - A PostgreSQL database with the PostGIS extension installed.

Depending on the type the chart will use a different Docker image and fill in some initial setup, like extension installation.

Modes of operation

The chart has three modes of operation. These are configured via the mode parameter:

• standalone - Creates new or updates an existing CNPG cluster. This is the default mode.
• replica - Creates a replica cluster from an existing CNPG cluster. Note that this mode is not yet supported.
• recovery - Recovers a CNPG cluster from a backup, object store or via pg_basebackup.

Backup configuration

CNPG implements disaster recovery via Barman. The following section configures the barman object store where backups will be stored. Barman performs backups of the cluster filesystem base backup and WALs. Both are stored in the specified location. The backup provider is configured via the backups.provider parameter. The following providers are supported:

• S3 or S3-compatible stores, like MinIO
• Microsoft Azure Blob Storage
• Google Cloud Storage

Additionally you can specify the following parameters:

• backups.retentionPolicy - The retention policy for backups. Defaults to 30d.
• backups.scheduledBackups - An array of scheduled backups containing a name and a crontab schedule. Example:

backups:
  scheduledBackups:
    - name: daily-backup
      schedule: "0 0 0 * * *" # Daily at midnight
      backupOwnerReference: self

Each backup adapter takes it's own set of parameters, listed in the Configuration options section below. Refer to the table for the full list of parameters and place the configuration under the appropriate key: backup.s3, backup.azure, or backup.google.

Recovery

There is a separate document outlining the recovery procedure here: Recovery

Examples

There are several configuration examples in the examples directory. Refer to them for a basic setup and refer to the CloudNativePG Documentation for more advanced configurations.

Values

Key	Type	Default	Description
backups.azure.connectionString	string	""
backups.azure.containerName	string	""
backups.azure.inheritFromAzureAD	bool	false
backups.azure.path	string	"/"
backups.azure.serviceName	string	"blob"
backups.azure.storageAccount	string	""
backups.azure.storageKey	string	""
backups.azure.storageSasToken	string	""
backups.data.compression	string	"gzip"	Data compression method. One of `` (for no compression), gzip, `bzip2` or `snappy`.
backups.data.encryption	string	"AES256"	Whether to instruct the storage provider to encrypt data files. One of `` (use the storage container default), AES256 or `aws:kms`.
backups.data.jobs	int	2	Number of data files to be archived or restored in parallel.
backups.destinationPath	string	""	Overrides the provider specific default path. Defaults to: S3: s3:// Azure: https://..core.windows.net/ Google: gs://
backups.enabled	bool	false	You need to configure backups manually, so backups are disabled by default.
backups.endpointCA	object	{"create":false,"key":"","name":"","value":""}	Specifies a CA bundle to validate a privately signed certificate.
backups.endpointCA.create	bool	false	Creates a secret with the given value if true, otherwise uses an existing secret.
backups.endpointURL	string	""	Overrides the provider specific default endpoint. Defaults to: S3: https://s3..amazonaws.com"
backups.google.applicationCredentials	string	""
backups.google.bucket	string	""
backups.google.gkeEnvironment	bool	false
backups.google.path	string	"/"
backups.provider	string	"s3"	One of s3, azure, google, or volumeSnapshot
backups.retentionPolicy	string	"30d"	Retention policy for backups
backups.s3.accessKey	string	""
backups.s3.bucket	string	""
backups.s3.path	string	"/"
backups.s3.region	string	""
backups.s3.secretKey	string	""
backups.scheduledBackups[0].backupOwnerReference	string	"self"	Backup owner reference
backups.scheduledBackups[0].name	string	"daily-backup"	Scheduled backup name
backups.scheduledBackups[0].schedule	string	"0 0 0 * * *"	Schedule in cron format
backups.secret.create	bool	true	Whether to create a secret for the backup credentials
backups.secret.name	string	""	Name of the backup credentials secret
backups.volumeSnapshot.className	string	""	The VolumeSnapshotClass to use for backups if provider is volumeSnapshot
backups.wal.compression	string	"gzip"	WAL compression method. One of `` (for no compression), gzip, `bzip2` or `snappy`.
backups.wal.encryption	string	"AES256"	Whether to instruct the storage provider to encrypt WAL files. One of `` (use the storage container default), AES256 or `aws:kms`.
backups.wal.maxParallel	int	1	Number of WAL files to be archived or restored in parallel.
cluster.additionalLabels	object	{}
cluster.affinity	object	{"topologyKey":"topology.kubernetes.io/zone"}	Affinity/Anti-affinity rules for Pods. See: https://cloudnative-pg.io/documentation/current/cloudnative-pg.v1/#postgresql-cnpg-io-v1-AffinityConfiguration
cluster.annotations	object	{}
cluster.certificates	object	{}	The configuration for the CA and related certificates. See: https://cloudnative-pg.io/documentation/current/cloudnative-pg.v1/#postgresql-cnpg-io-v1-CertificatesConfiguration
cluster.enableSuperuserAccess	bool	true	When this option is enabled, the operator will use the SuperuserSecret to update the postgres user password. If the secret is not present, the operator will automatically create one. When this option is disabled, the operator will ignore the SuperuserSecret content, delete it when automatically created, and then blank the password of the postgres user by setting it to NULL.
cluster.imageName	string	""	Name of the container image, supporting both tags (:) and digests for deterministic and repeatable deployments: :@sha256:
cluster.imagePullPolicy	string	"IfNotPresent"	Image pull policy. One of Always, Never or IfNotPresent. If not defined, it defaults to IfNotPresent. Cannot be updated. More info: https://kubernetes.io/docs/concepts/containers/images#updating-images
cluster.imagePullSecrets	list	[]	The list of pull secrets to be used to pull the images. See: https://cloudnative-pg.io/documentation/current/cloudnative-pg.v1/#postgresql-cnpg-io-v1-LocalObjectReference
cluster.initdb	object	{}	BootstrapInitDB is the configuration of the bootstrap process when initdb is used. See: https://cloudnative-pg.io/documentation/current/bootstrap/ See: https://cloudnative-pg.io/documentation/current/cloudnative-pg.v1/#postgresql-cnpg-io-v1-bootstrapinitdb
cluster.instances	int	3	Number of instances
cluster.logLevel	string	"info"	The instances' log level, one of the following values: error, warning, info (default), debug, trace
cluster.monitoring.customQueries	list	[]	Custom Prometheus metrics
cluster.monitoring.enabled	bool	false	Whether to enable monitoring
cluster.monitoring.podMonitor.enabled	bool	true	Whether to enable the PodMonitor
cluster.monitoring.prometheusRule.enabled	bool	true	Whether to enable the PrometheusRule automated alerts
cluster.monitoring.prometheusRule.excludeRules	list	[]	Exclude specified rules
cluster.postgresGID	int	26	The GID of the postgres user inside the image, defaults to 26
cluster.postgresUID	int	26	The UID of the postgres user inside the image, defaults to 26
cluster.postgresql	object	{}	Configuration of the PostgreSQL server. See: https://cloudnative-pg.io/documentation/current/cloudnative-pg.v1/#postgresql-cnpg-io-v1-PostgresConfiguration
cluster.primaryUpdateMethod	string	"switchover"	Method to follow to upgrade the primary server during a rolling update procedure, after all replicas have been successfully updated. It can be switchover (default) or in-place (restart).
cluster.primaryUpdateStrategy	string	"unsupervised"	Strategy to follow to upgrade the primary server during a rolling update procedure, after all replicas have been successfully updated: it can be automated (unsupervised - default) or manual (supervised)
cluster.priorityClassName	string	""
cluster.resources	object	{}	Resources requirements of every generated Pod. Please refer to https://kubernetes.io/docs/concepts/configuration/manage-resources-containers/ for more information. We strongly advise you use the same setting for limits and requests so that your cluster pods are given a Guaranteed QoS. See: https://kubernetes.io/docs/concepts/workloads/pods/pod-qos/
cluster.roles	list	[]	This feature enables declarative management of existing roles, as well as the creation of new roles if they are not already present in the database. See: https://cloudnative-pg.io/documentation/current/declarative_role_management/
cluster.storage.size	string	"8Gi"
cluster.storage.storageClass	string	""
cluster.superuserSecret	string	""
fullnameOverride	string	""	Override the full name of the chart
mode	string	"standalone"	Cluster mode of operation. Available modes: * standalone - default mode. Creates new or updates an existing CNPG cluster. * replica - Creates a replica cluster from an existing CNPG cluster. # TODO * recovery - Same as standalone but creates a cluster from a backup, object store or via pg_basebackup.
nameOverride	string	""	Override the name of the chart
pooler.enabled	bool	false	Whether to enable PgBouncer
pooler.instances	int	3	Number of PgBouncer instances
pooler.monitoring.enabled	bool	false	Whether to enable monitoring
pooler.monitoring.podMonitor.enabled	bool	true	Whether to enable the PodMonitor
pooler.parameters	object	{"default_pool_size":"25","max_client_conn":"1000"}	PgBouncer configuration parameters
pooler.poolMode	string	"transaction"	PgBouncer pooling mode
pooler.template	object	{}	Custom PgBouncer deployment template. Use to override image, specify resources, etc.
pooler.type	string	"rw"	PgBouncer type of service to forward traffic to.
recovery.azure.connectionString	string	""
recovery.azure.containerName	string	""
recovery.azure.inheritFromAzureAD	bool	false
recovery.azure.path	string	"/"
recovery.azure.serviceName	string	"blob"
recovery.azure.storageAccount	string	""
recovery.azure.storageKey	string	""
recovery.azure.storageSasToken	string	""
recovery.backupName	string	""	Backup Recovery Method
recovery.clusterName	string	""	The original cluster name when used in backups. Also known as serverName.
recovery.destinationPath	string	""	Overrides the provider specific default path. Defaults to: S3: s3:// Azure: https://..core.windows.net/ Google: gs://
recovery.endpointCA	object	{"create":false,"key":"","name":"","value":""}	Specifies a CA bundle to validate a privately signed certificate.
recovery.endpointCA.create	bool	false	Creates a secret with the given value if true, otherwise uses an existing secret.
recovery.endpointURL	string	""	Overrides the provider specific default endpoint. Defaults to: S3: https://s3..amazonaws.com" Leave empty if using the default S3 endpoint
recovery.google.applicationCredentials	string	""
recovery.google.bucket	string	""
recovery.google.gkeEnvironment	bool	false
recovery.google.path	string	"/"
recovery.method	string	"backup"	Available recovery methods: * backup - Recovers a CNPG cluster from a CNPG backup (PITR supported) Needs to be on the same cluster in the same namespace. * object_store - Recovers a CNPG cluster from a barman object store (PITR supported). * pg_basebackup - Recovers a CNPG cluster viaa streaming replication protocol. Useful if you want to migrate databases to CloudNativePG, even from outside Kubernetes. # TODO
recovery.pitrTarget.time	string	""	Time in RFC3339 format
recovery.provider	string	"s3"	One of s3, azure or google
recovery.s3.accessKey	string	""
recovery.s3.bucket	string	""
recovery.s3.path	string	"/"
recovery.s3.region	string	""
recovery.s3.secretKey	string	""
recovery.secret.create	bool	true	Whether to create a secret for the backup credentials
recovery.secret.name	string	""	Name of the backup credentials secret
type	string	"postgresql"	Type of the CNPG database. Available types: * postgresql * postgis

Maintainers

Name	Email	Url
itay-grudev	[email protected]

Features that require feedback

Please raise a ticket tested any of the following features and they have worked. Alternatively a ticket and a PR if you have found that something needs a change to work properly.

• Google Cloud Storage Backups
• Google Cloud Storage Recovery

TODO

• IAM Role for S3 Service Account
• Automatic provisioning of a Alert Manager configuration