cluster

package
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 Go to latest Published: Apr 29, 2020 License: Apache-2.0 Imports: 32 Imported by: 0

Documentation

Overview

Package cluster holds the cluster CRD logic and definitions A cluster is comprised of a primary service, replica service, primary deployment, and replica deployment

Package cluster holds the cluster CRD logic and definitions A cluster is comprised of a primary service, replica service, primary deployment, and replica deployment

Package cluster holds the cluster CRD logic and definitions A cluster is comprised of a primary service, replica service, primary deployment, and replica deployment

Package cluster holds the cluster CRD logic and definitions A cluster is comprised of a primary service, replica service, primary deployment, and replica deployment

Package cluster holds the cluster CRD logic and definitions A cluster is comprised of a primary service, replica service, primary deployment, and replica deployment

Package cluster holds the cluster CRD logic and definitions A cluster is comprised of a primary service, replica service, primary deployment, and replica deployment

Index

Constants

View Source 
const ReplicaSuffix = "-replica"

ReplicaSuffix ...

Variables

View Source 
var (
	// ErrStandbyNotAllowed contains the error message returned when an API call is not
	// permitted because it involves a cluster that is in standby mode
	ErrStandbyNotAllowed = errors.New("Action not permitted because standby mode is enabled")
	// ErrStandbyNotEnabled defines the error that is thrown when
	// standby mode is not enabled but a standby action was attempted
	ErrStandbyNotEnabled = errors.New("Standby mode not enabled")
	// ErrClusterNotShutdown defines the error that is thrown when an action cannot
	// proceed because the cluster is not in standby mode
	ErrClusterNotShutdown = errors.New("Cluster not in shutdown status")
)

Functions

func AddClusterBase 

func AddClusterBase(clientset *kubernetes.Clientset, client *rest.RESTClient, cl *crv1.Pgcluster, namespace string)

func AddPgbouncer 

func AddPgbouncer(clientset *kubernetes.Clientset, restclient *rest.RESTClient, restconfig *rest.Config, cluster *crv1.Pgcluster) error

AddPgbouncer contains the various functions that are used to add a pgBouncer Deployment to a PostgreSQL cluster

Any returned error is logged in the calling function

func AddUpgrade 

func AddUpgrade(clientset *kubernetes.Clientset, restclient *rest.RESTClient, upgrade *crv1.Pgtask, namespace string)

AddUpgrade implements the upgrade workflow in accordance with the received pgtask the general process is outlined below: 1) get the existing pgcluster CRD instance that matches the name provided in the pgtask 2) Patch the existing services 3) Determine the current Primary PVC 4) Scale down existing replicas and store the number for recreation 5) Delete the various resources that will need to be recreated 6) Recreate the BackrestRepo secret, since the key encryption algorithm has been updated 7) Update the existing pgcluster CRD instance to match the current version 8) Submit the pgcluster CRD for recreation

func Clone 

func Clone(clientset *kubernetes.Clientset, client *rest.RESTClient, restConfig *rest.Config, namespace string, task *crv1.Pgtask)

Clone allows for one to clone the data from an existing cluster to a new cluster in the Operator. It works by doing the following:

1. Create some PVCs that will be utilized by the new cluster 2. Syncing (i.e. using rsync) the pgBackRest repository from the old cluster to the new cluster 3. perform a pgBackRest delta restore to the new PVC 4. Create a new cluster by using the old cluster as a template and providing the specifications to the new cluster, with a few "opinionated" items (e.g. copying over the secrets)

func CreateRmdataJob 

func CreateRmdataJob(clientset *kubernetes.Clientset, cl *crv1.Pgcluster, namespace string, removeData, removeBackup, isReplica, isBackup bool) error

CreateService ...

func CreateService 

func CreateService(clientset *kubernetes.Clientset, fields *ServiceTemplateFields, namespace string) error

CreateService ...

func DeleteCluster 

func DeleteCluster(clientset *kubernetes.Clientset, restclient *rest.RESTClient, cl *crv1.Pgcluster, namespace string) error

DeleteCluster ...

func DeleteClusterBase 

func DeleteClusterBase(clientset *kubernetes.Clientset, restclient *rest.RESTClient, cl *crv1.Pgcluster, namespace string)

DeleteClusterBase ...

func DeletePgbouncer 

func DeletePgbouncer(clientset *kubernetes.Clientset, restclient *rest.RESTClient, restconfig *rest.Config, cluster *crv1.Pgcluster) error

DeletePgbouncer contains the various functions that are used to delete a pgBouncer Deployment for a PostgreSQL cluster

Note that "uninstall" deletes all of the objects that are added to the PostgreSQL database, such as the "pgbouncer" user. This is not normally neded to be done as pgbouncer user is disabled, but if the user wishes to be thorough they can do this

Any errors that are returned should be logged in the calling function, though some logging occurs in this function as well

func DeleteReplica 

func DeleteReplica(clientset *kubernetes.Clientset, cl *crv1.Pgreplica, namespace string) error

DeleteReplica ...

func DisableStandby 

func DisableStandby(clientset kubernetes.Interface, cluster crv1.Pgcluster) error

DisableStandby disables standby mode for the cluster

func EnableStandby 

func EnableStandby(clientset *kubernetes.Clientset, cluster crv1.Pgcluster) error

EnableStandby enables standby mode for the cluster

func Failover 

func Failover(identifier string, clientset *kubernetes.Clientset, client *rest.RESTClient, clusterName string, task *crv1.Pgtask, namespace string, restconfig *rest.Config) error

func FailoverBase 

func FailoverBase(namespace string, clientset *kubernetes.Clientset, client *rest.RESTClient, task *crv1.Pgtask, restconfig *rest.Config)

FailoverBase ... gets called first on a failover

func PatchpgtaskFailoverStatus 

func PatchpgtaskFailoverStatus(restclient *rest.RESTClient, oldCrd *crv1.Pgtask, namespace string) error

func PublishCloneEvent 

func PublishCloneEvent(eventType string, namespace string, task *crv1.Pgtask, errorMessage string)

PublishCloneEvent lets one publish an event related to the clone process

func PublishUpgradeEvent 

func PublishUpgradeEvent(eventType string, namespace string, task *crv1.Pgtask, errorMessage string)

PublishUpgradeEvent lets one publish an event related to the upgrade process

func RemovePrimaryOnRoleChangeTag 

func RemovePrimaryOnRoleChangeTag(clientset *kubernetes.Clientset, restconfig *rest.Config,
	clusterName, namespace string) error

RemovePrimaryOnRoleChangeTag sets the 'primary_on_role_change' tag to null in the Patroni DCS, effectively removing the tag. This is accomplished by exec'ing into the primary PG pod, and sending a patch request to update the appropriate data (i.e. the 'primary_on_role_change' tag) in the DCS.

func RotatePgBouncerPassword 

func RotatePgBouncerPassword(clientset *kubernetes.Clientset, restclient *rest.RESTClient, restconfig *rest.Config, cluster *crv1.Pgcluster) error

RotatePgBouncerPassword rotates the password for a pgBouncer PostgreSQL user, which involves updating the password in the PostgreSQL cluster as well as the users secret that is available in the pgbouncer Pod

func ScaleBase 

func ScaleBase(clientset *kubernetes.Clientset, client *rest.RESTClient, replica *crv1.Pgreplica, namespace string)

ScaleBase ...

func ScaleDownBase 

func ScaleDownBase(clientset *kubernetes.Clientset, client *rest.RESTClient, replica *crv1.Pgreplica, namespace string)

ScaleDownBase ...

func SetReplicaNumber 

func SetReplicaNumber(pgcluster *crv1.Pgcluster, numReplicas string)

SetReplicaNumber sets the pgcluster's replica value based off of the number of pgreplicas discovered during the deletion process. This is necessary because the pgcluser will only include the number of replicas created when the pgcluster was first generated (e.g. pgo create cluster hippo --replica-count=2) but will not included any replicas created using the 'pgo scale' command

func ShutdownCluster 

func ShutdownCluster(clientset *kubernetes.Clientset, restclient *rest.RESTClient,
	cluster crv1.Pgcluster) error

ShutdownCluster is responsible for shutting down a cluster that is currently running. This includes changing the replica count for all clusters to 0, and then updating the pgcluster with a shutdown status.

func StartupCluster 

func StartupCluster(clientset *kubernetes.Clientset, cluster crv1.Pgcluster) error

StartupCluster is responsible for starting a cluster that was previsouly shutdown. This includes changing the replica count for all clusters to 1, and then updating the pgcluster with a shutdown status.

func UninstallPgBouncer 

func UninstallPgBouncer(clientset *kubernetes.Clientset, restconfig *rest.Config, cluster *crv1.Pgcluster) error

UninstallPgBouncer uninstalls the "pgbouncer" user and other management objects from the PostgreSQL cluster

func UpdateCloneWorkflow 

func UpdateCloneWorkflow(client *rest.RESTClient, namespace, workflowID, status string) error

UpdateCloneWorkflow updates a Workflow with the current state of the clone task

func UpdatePgbouncer 

func UpdatePgbouncer(clientset *kubernetes.Clientset, restclient *rest.RESTClient, oldCluster, newCluster *crv1.Pgcluster) error

UpdatePgbouncer contains the various functions that are used to perform updates to the pgBouncer deployment for a cluster, such as rotating a password

Any errors that are returned should be logged in the calling function, though some logging occurs in this function as well

func UpdateResources 

func UpdateResources(clientset *kubernetes.Clientset, restConfig *rest.Config, cluster *crv1.Pgcluster) error

UpdateResources updates the PostgreSQL instance Deployments to reflect the update resources (i.e. CPU, memory)

func UpdateTablespaces 

func UpdateTablespaces(clientset *kubernetes.Clientset, restConfig *rest.Config,
	cluster *crv1.Pgcluster, newTablespaces map[string]crv1.PgStorageSpec) error

UpdateTablespaces updates the PostgreSQL instance Deployments to update what tablespaces are mounted. Though any new tablespaces are present in the CRD, to attempt to do less work this function takes a map of the new tablespaces that are being added, so we only have to check and create the PVCs that are being mounted at this time

To do this, iterate through the tablespace mount map that is present in the new cluster.

Types

type PgbouncerConfFields 

type PgbouncerConfFields struct {
	PG_PRIMARY_SERVICE_NAME string
	PG_PORT                 string
}

type PgbouncerPasswdFields 

type PgbouncerPasswdFields struct {
	Username string
	Password string
}

type RmdataJob 

type RmdataJob struct {
	JobName        string
	ClusterName    string
	PGOImagePrefix string
	PGOImageTag    string
	//		SecurityContext string
	RemoveData   string
	RemoveBackup string
	IsBackup     string
	IsReplica    string
}

type ScaleClusterInfo 

type ScaleClusterInfo struct {
	PrimaryDeployment        string
	ReplicaDeployments       []string
	PGBackRestRepoDeployment string
	PGBouncerDeployment      string
}

ScaleClusterInfo contains information about a cluster obtained when scaling the various deployments for a cluster. This includes the name of the primary deployment, all replica deployments, along with the names of the services enabled for the cluster.

func ScaleClusterDeployments 

func ScaleClusterDeployments(clientset *kubernetes.Clientset, cluster crv1.Pgcluster, replicas int,
	scalePrimary, scaleReplicas, scaleBackRestRepo,
	scalePGBouncer bool) (clusterInfo ScaleClusterInfo, err error)

ScaleClusterDeployments scales all deployments for a cluster to the number of replicas specified using the 'replicas' parameter. This is typically used to scale-up or down the primary deployment and any supporting services (pgBackRest and pgBouncer) when shutting down or starting up the cluster due to a scale or scale-down request.

type ServiceTemplateFields 

type ServiceTemplateFields struct {
	Name         string
	ServiceName  string
	ClusterName  string
	Port         string
	PGBadgerPort string
	ExporterPort string
	ServiceType  string
}

ServiceTemplateFields ...

Source Files

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