Overview
KubeDB is the Kubernetes Native Database Management Solution which simplifies and automates routine database tasks such as Provisioning, Monitoring, Upgrading, Patching, Scaling, Volume Expansion, Backup, Recovery, Failure detection, and Repair for various popular databases on private and public clouds. The databases that KubeDB supports are MySQL, MongoDB, MariaDB, Kafka, Elasticsearch, Redis, PostgreSQL, ProxySQL, Percona XtraDB, Memcached and PgBouncer. You can find the guides to all the supported databases in KubeDB . In this tutorial we will deploy and manage PgBouncer in Azure Kubernetes Service (AKS). We will cover the following steps:
- Install KubeDB
- Deploy PostgreSQL Clustered Database
- Deploy PgBouncer Cluster
- Read/Write through PgBouncer
Install KubeDB
We will follow the steps to install KubeDB.
Get Cluster ID
We need the cluster ID to get the KubeDB License. To get cluster ID we can run the following command:
$ kubectl get ns kube-system -o jsonpath='{.metadata.uid}'
8e336615-0dbb-4ae8-b72f-2e7ec34c399d
Get License
Go to Appscode License Server to get the license.txt file. For this tutorial we will use KubeDB Enterprise Edition.
Install KubeDB
We will use helm to install KubeDB. Please install helm here
if it is not already installed.
Now, let’s install KubeDB.
$ helm repo add appscode https://charts.appscode.com/stable/
$ helm repo update
$ helm search repo appscode/kubedb
NAME CHART VERSION APP VERSION DESCRIPTION
appscode/kubedb v2023.06.19 v2023.06.19 KubeDB by AppsCode - Production ready databases...
appscode/kubedb-autoscaler v0.19.0 v0.19.0 KubeDB Autoscaler by AppsCode - Autoscale KubeD...
appscode/kubedb-catalog v2023.06.19 v2023.06.19 KubeDB Catalog by AppsCode - Catalog for databa...
appscode/kubedb-community v0.24.2 v0.24.2 KubeDB Community by AppsCode - Community featur...
appscode/kubedb-crds v2023.06.19 v2023.06.19 KubeDB Custom Resource Definitions
appscode/kubedb-dashboard v0.10.0 v0.10.0 KubeDB Dashboard by AppsCode
appscode/kubedb-enterprise v0.11.2 v0.11.2 KubeDB Enterprise by AppsCode - Enterprise feat...
appscode/kubedb-grafana-dashboards v2023.06.19 v2023.06.19 A Helm chart for kubedb-grafana-dashboards by A...
appscode/kubedb-metrics v2023.06.19 v2023.06.19 KubeDB State Metrics
appscode/kubedb-one v2023.06.19 v2023.06.19 KubeDB and Stash by AppsCode - Production ready...
appscode/kubedb-ops-manager v0.21.0 v0.21.1 KubeDB Ops Manager by AppsCode - Enterprise fea...
appscode/kubedb-opscenter v2023.06.19 v2023.06.19 KubeDB Opscenter by AppsCode
appscode/kubedb-provisioner v0.34.0 v0.34.0 KubeDB Provisioner by AppsCode - Community feat...
appscode/kubedb-schema-manager v0.10.0 v0.10.0 KubeDB Schema Manager by AppsCode
appscode/kubedb-ui v2023.03.23 0.3.28 A Helm chart for Kubernetes
appscode/kubedb-ui-server v2021.12.21 v2021.12.21 A Helm chart for kubedb-ui-server by AppsCode
appscode/kubedb-webhook-server v0.10.0 v0.10.0 KubeDB Webhook Server by AppsCode
# Install KubeDB Enterprise operator chart
$ helm install kubedb appscode/kubedb \
--version v2023.06.19 \
--namespace kubedb --create-namespace \
--set kubedb-provisioner.enabled=true \
--set kubedb-ops-manager.enabled=true \
--set kubedb-autoscaler.enabled=true \
--set kubedb-dashboard.enabled=true \
--set kubedb-schema-manager.enabled=true \
--set-file global.license=/path/to/the/license.txt
Let’s verify the installation:
$ watch kubectl get pods --all-namespaces -l "app.kubernetes.io/instance=kubedb"
NAMESPACE NAME READY STATUS RESTARTS AGE
kubedb kubedb-kubedb-autoscaler-5bfdd8bfdc-7mldj 1/1 Running 0 73s
kubedb kubedb-kubedb-dashboard-84ddfdb557-dfnht 1/1 Running 0 73s
kubedb kubedb-kubedb-ops-manager-bd6b6479f-pp7n9 1/1 Running 0 73s
kubedb kubedb-kubedb-provisioner-59cdd74486-vpnzr 1/1 Running 0 73s
kubedb kubedb-kubedb-schema-manager-5f4cfb8475-7dt7n 1/1 Running 0 73s
kubedb kubedb-kubedb-webhook-server-7b9cb7bf96-ms89v 1/1 Running 0 73s
We can list the CRD Groups that have been registered by the operator by running the following command:
$ kubectl get crd -l app.kubernetes.io/name=kubedb
NAME CREATED AT
elasticsearchautoscalers.autoscaling.kubedb.com 2023-07-05T04:50:49Z
elasticsearchdashboards.dashboard.kubedb.com 2023-07-05T04:50:46Z
elasticsearches.kubedb.com 2023-07-05T04:50:39Z
elasticsearchopsrequests.ops.kubedb.com 2023-07-05T04:50:44Z
elasticsearchversions.catalog.kubedb.com 2023-07-05T04:48:09Z
etcds.kubedb.com 2023-07-05T04:50:39Z
etcdversions.catalog.kubedb.com 2023-07-05T04:48:09Z
kafkas.kubedb.com 2023-07-05T04:50:40Z
kafkaversions.catalog.kubedb.com 2023-07-05T04:48:09Z
mariadbautoscalers.autoscaling.kubedb.com 2023-07-05T04:50:49Z
mariadbdatabases.schema.kubedb.com 2023-07-05T04:50:57Z
mariadbopsrequests.ops.kubedb.com 2023-07-05T04:50:59Z
mariadbs.kubedb.com 2023-07-05T04:50:39Z
mariadbversions.catalog.kubedb.com 2023-07-05T04:48:10Z
memcacheds.kubedb.com 2023-07-05T04:50:39Z
memcachedversions.catalog.kubedb.com 2023-07-05T04:48:10Z
mongodbautoscalers.autoscaling.kubedb.com 2023-07-05T04:50:49Z
mongodbdatabases.schema.kubedb.com 2023-07-05T04:50:56Z
mongodbopsrequests.ops.kubedb.com 2023-07-05T04:50:48Z
mongodbs.kubedb.com 2023-07-05T04:50:39Z
mongodbversions.catalog.kubedb.com 2023-07-05T04:48:10Z
mysqlautoscalers.autoscaling.kubedb.com 2023-07-05T04:50:49Z
mysqldatabases.schema.kubedb.com 2023-07-05T04:50:55Z
mysqlopsrequests.ops.kubedb.com 2023-07-05T04:50:56Z
mysqls.kubedb.com 2023-07-05T04:50:39Z
mysqlversions.catalog.kubedb.com 2023-07-05T04:48:11Z
perconaxtradbautoscalers.autoscaling.kubedb.com 2023-07-05T04:50:49Z
perconaxtradbopsrequests.ops.kubedb.com 2023-07-05T04:51:13Z
perconaxtradbs.kubedb.com 2023-07-05T04:50:39Z
perconaxtradbversions.catalog.kubedb.com 2023-07-05T04:48:11Z
pgbouncers.kubedb.com 2023-07-05T04:50:40Z
pgbouncerversions.catalog.kubedb.com 2023-07-05T04:48:11Z
postgresautoscalers.autoscaling.kubedb.com 2023-07-05T04:50:49Z
postgresdatabases.schema.kubedb.com 2023-07-05T04:50:57Z
postgreses.kubedb.com 2023-07-05T04:50:40Z
postgresopsrequests.ops.kubedb.com 2023-07-05T04:51:06Z
postgresversions.catalog.kubedb.com 2023-07-05T04:48:12Z
proxysqlautoscalers.autoscaling.kubedb.com 2023-07-05T04:50:49Z
proxysqlopsrequests.ops.kubedb.com 2023-07-05T04:51:09Z
proxysqls.kubedb.com 2023-07-05T04:50:40Z
proxysqlversions.catalog.kubedb.com 2023-07-05T04:48:12Z
publishers.postgres.kubedb.com 2023-07-05T04:51:23Z
redisautoscalers.autoscaling.kubedb.com 2023-07-05T04:50:49Z
redises.kubedb.com 2023-07-05T04:50:40Z
redisopsrequests.ops.kubedb.com 2023-07-05T04:51:02Z
redissentinelautoscalers.autoscaling.kubedb.com 2023-07-05T04:50:49Z
redissentinelopsrequests.ops.kubedb.com 2023-07-05T04:51:16Z
redissentinels.kubedb.com 2023-07-05T04:50:40Z
redisversions.catalog.kubedb.com 2023-07-05T04:48:12Z
subscribers.postgres.kubedb.com 2023-07-05T04:51:26Z
Deploy PostgreSQL Clustered Database
Now, we are going to Deploy PostgreSQL Clustered Database using KubeDB. First, let’s create a Namespace in which we will deploy the server.
$ kubectl create namespace demo
namespace/demo created
Here, is the yaml of the PostgreSQL CRO we are going to use:
apiVersion: kubedb.com/v1alpha2
kind: Postgres
metadata:
name: postgres
namespace: demo
spec:
version: "15.1"
replicas: 3
standbyMode: Hot
storageType: Durable
storage:
storageClassName: "default"
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 1Gi
terminationPolicy: WipeOut
Let’s save this yaml configuration into postgres.yaml
Then create the above PostgreSQL CRO
$ kubectl create -f postgres.yaml
postgres.kubedb.com/postgres created
In this yaml,
spec.versionfield specifies the version of PostgreSQL. Here, we are using PostgreSQLversion 15.1. You can list the KubeDB supported versions of PostgreSQL by running$ kubectl get postgresversionscommand.spec.standbyis an optional field that specifies the standby modehotorwarmto use for standby replicas. Inhotstandby mode, standby replicas can accept connection and run read-only queries. Inwarmstandby mode, standby replicas can’t accept connection and only used for replication purpose.spec.storagespecifies PVC spec that will be dynamically allocated to store data for this database. This storage spec will be passed to the StatefulSet created by KubeDB operator to run database pods. You can specify any StorageClass available in your cluster with appropriate resource requests.- And the
spec.terminationPolicyfield is Wipeout means that the database will be deleted without restrictions. It can also be “Halt”, “Delete” and “DoNotTerminate”. Learn More about these in Termination Policy .
Let’s check if the server is ready to use,
$ kubectl get postgres -n demo postgres
NAME VERSION STATUS AGE
postgres 15.1 Ready 2m50s
Create Database, User & Grant Privileges
Here, we are going to create a database with a couple of users and grant them all privileges to the database.
$ kubectl exec -it postgres-0 -n demo -- bash
Defaulted container "postgres" out of: postgres, pg-coordinator, postgres-init-container (init)
postgres-0:/$ psql -c "create database test"
CREATE DATABASE
postgres-0:/$ psql -c "create role roy with login password '12345'"
CREATE ROLE
postgres-0:/$ psql -c "grant all privileges on database test to roy"
GRANT
postgres-0:/$ psql test
psql (15.1)
Type "help" for help.
test=# GRANT ALL ON SCHEMA public TO roy;
GRANT
test=# exit
postgres-0:/$ exit
exit
Create Secret
Now, we’ll create a secret that includes the User and Password that we created as Postgres roles above.
apiVersion: v1
stringData:
password: "12345"
username: roy
kind: Secret
metadata:
name: db-user-pass
namespace: demo
type: kubernetes.io/basic-auth
Let’s save this yaml configuration into db-user-pass.yaml
Then create the above Secret
$ kubectl apply -f db-user-pass.yaml
secret/db-user-pass created
Create AppBinding
Now, we are going to create a AppBinding which we will connect as a database reference to PgBouncer,
apiVersion: appcatalog.appscode.com/v1alpha1
kind: AppBinding
metadata:
name: pg-appbinding
namespace: demo
labels:
app.kubernetes.io/component: database
app.kubernetes.io/instance: pg-appbinding
app.kubernetes.io/managed-by: kubedb.com
app.kubernetes.io/name: postgreses.kubedb.com
spec:
appRef:
apiGroup: kubedb.com
kind: Postgres
name: postgres
namespace: demo
clientConfig:
service:
name: postgres
path: /
port: 5432
query: sslmode=disable
scheme: postgresql
parameters:
apiVersion: appcatalog.appscode.com/v1alpha1
kind: StashAddon
stash:
addon:
backupTask:
name: postgres-backup-15.1
restoreTask:
name: postgres-restore-15.1
secret:
name: db-user-pass
type: kubedb.com/postgres
version: "15.1"
Let’s save this yaml configuration into pg-appbinding.yaml
Then create the above AppBinding
$ kubectl apply -f pg-appbinding.yaml
appbinding.appcatalog.appscode.com/pg-appbinding created
In this yaml,
spec.appRefrefers to the underlying application. It contains the information of 4 fields namedapiGroup,kind,name&namespace.spec.clientConfig.serviceIf you are running the database inside the Kubernetes cluster, you can use Kubernetes service to connect with the database. You have to specify the following fields likename,scheme,portinspec.clientConfig.servicesection if you manually create anAppBindingobject.
Deploy PgBouncer Cluster
We are going to Deploy PgBouncer cluster using KubeDB. Here, is the yaml of the PgBouncer CRO we are going to use:
apiVersion: kubedb.com/v1alpha2
kind: PgBouncer
metadata:
name: pgbouncer
namespace: demo
spec:
version: "1.18.0"
replicas: 3
databases:
- alias: "testdb"
databaseName: "test"
databaseRef:
name: "pg-appbinding"
namespace: demo
connectionPool:
port: 5432
poolMode: session
authType: md5
terminationPolicy: WipeOut
Let’s save this yaml configuration into pgbouncer.yaml
Then create the above PgBouncer CRO
$ kubectl apply -f pgbouncer.yaml
pgbouncer.kubedb.com/pgbouncer created
In this yaml,
spec.versionfield specifies the version of PgBouncer. Here, we are using PgBouncer1.18.0. You can list the KubeDB supported versions of PgBouncer by running$ kubectl get pgbouncerversionscommand.spec.databaseNamecontains the name of PostgreSQL database which istestin this case.spec.databaseRef.namecontains the name of the appbinding which ispg-appbindingin this case.spec.databaseRef.namespacecontains the namespace information of backend server.spec.connectionPool.poolModespecifies when a server connection can be reused by other clients.sessiondefines Server is released back to pool after client disconnects.spec.connectionPool.authTypespecifies client authentication type.- And the
spec.terminationPolicyfield is Wipeout means that the database will be deleted without restrictions. It can also be “Halt”, “Delete” and “DoNotTerminate”.
Let’s check if the server is ready to use,
$ kubectl get pgbouncer -n demo pgbouncer
NAME VERSION STATUS AGE
pgbouncer 1.18.0 Ready 109s
Once all of the above things are handled correctly then you will see that the following objects are created:
$ kubectl get all -n demo
NAME READY STATUS RESTARTS AGE
pod/pgbouncer-0 1/1 Running 0 113s
pod/pgbouncer-1 1/1 Running 0 111s
pod/pgbouncer-2 1/1 Running 0 105s
pod/postgres-0 2/2 Running 0 7m29s
pod/postgres-1 2/2 Running 0 8m11s
pod/postgres-2 2/2 Running 0 8m59s
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/pgbouncer ClusterIP 10.8.6.63 <none> 5432/TCP 3m7s
service/pgbouncer-pods ClusterIP None <none> 5432/TCP 3m7s
service/postgres ClusterIP 10.8.6.135 <none> 5432/TCP,2379/TCP 8m32s
service/postgres-pods ClusterIP None <none> 5432/TCP,2380/TCP,2379/TCP 8m32s
service/postgres-standby ClusterIP 10.8.0.37 <none> 5432/TCP 8m32s
NAME READY AGE
statefulset.apps/pgbouncer 3/3 2m3s
statefulset.apps/postgres 3/3 9m34s
NAME TYPE VERSION AGE
appbinding.appcatalog.appscode.com/pg-appbinding kubedb.com/postgres 15.1 3m52s
appbinding.appcatalog.appscode.com/pgbouncer kubedb.com/pgbouncer 1.18.0 3m7s
appbinding.appcatalog.appscode.com/postgres kubedb.com/postgres 15.1 8m58s
NAME VERSION STATUS AGE
postgres.kubedb.com/postgres 15.1 Ready 9m
NAME VERSION STATUS AGE
pgbouncer.kubedb.com/pgbouncer 1.18.0 Ready 3m27s
We have successfully deployed PgBouncer in AKS. Now, we can exec into the container to use the database.
Insert Sample Data
Now, let’s exec to the PgBouncer Pod to enter into PostgreSQL server using previously created user credentials to write and read some sample data to the database,
$ kubectl exec -it -n demo pgbouncer-0 -- sh
Defaulted container "pgbouncer" out of: pgbouncer, pgbouncer-init-container (init)
$ psql -d "host=localhost user=roy password=12345 dbname=testdb"
psql (15.1)
Type "help" for help.
testdb=> create table music(id int, artist varchar, name varchar);
CREATE TABLE
testdb=> insert into music values(1, 'Bobby Bare', 'Five Hundred Miles');
INSERT 0 1
testdb=> select * from music;
id | artist | name
----+-------------+-------------------
1 | Bobby Bare | Five Hundred Miles
(1 row)
testdb=> exit
$ exit
Verify Data in PostgreSQL
Here, we are going to exec into PostgreSQL pod to verify the inserted data through PgBouncer.
$ kubectl exec -it -n demo postgres-0 -- bash
Defaulted container "postgres" out of: postgres, pg-coordinator, postgres-init-container (init)
$ psql
psql (15.1)
Type "help" for help.
postgres=# \l
List of databases
Name | Owner | Encoding | Collate | Ctype | Access privileges
---------------+----------+----------+------------+------------+-----------------------
kubedb_system | postgres | UTF8 | en_US.utf8 | en_US.utf8 |
postgres | postgres | UTF8 | en_US.utf8 | en_US.utf8 |
template0 | postgres | UTF8 | en_US.utf8 | en_US.utf8 | =c/postgres +
| | | | | postgres=CTc/postgres
template1 | postgres | UTF8 | en_US.utf8 | en_US.utf8 | =c/postgres +
| | | | | postgres=CTc/postgres
test | postgres | UTF8 | en_US.utf8 | en_US.utf8 | =Tc/postgres +
| | | | | postgres=CTc/postgres+
| | | | | roy=CTc/postgres
(5 rows)
postgres=# \c test
You are now connected to database "test" as user "postgres".
test=# \dt
List of relations
Schema | Name | Type | Owner
--------+-------+-------+-------
public | music | table | roy
(1 row)
test=# select * from music;
id | artist | name
----+-------------+-------------------
1 | Bobby Bare | Five Hundred Miles
(1 row)
test=# exit
$ exit
We’ve successfully access our PostgreSQL database through PgBouncer. Click Run & Manage Production-Grade PgBouncer on Kubernetes for more detailed information.
We have made an in depth tutorial on PostgreSQL Connection Pooling In Kubernetes Using KubeDB PGBouncer. You can have a look into the video below:
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More about PgBouncer in Kubernetes
If you have found a bug with KubeDB or want to request for new features, please file an issue .