Install Percona Distribution for PostgreSQL on Kubernetes¶
Following steps will allow you to install the Operator and use it to manage Percona Distribution for PostgreSQL in a Kubernetes-based environment.
-
First of all, clone the percona-postgresql-operator repository:
$ git clone -b v1.3.0 https://github.com/percona/percona-postgresql-operator $ cd percona-postgresql-operator
Note
It is crucial to specify the right branch with
-b
option while cloning the code on this step. Please be careful. -
The next thing to do is to add the
pgo
namespace to Kubernetes, not forgetting to set the correspondent context for further steps:$ kubectl create namespace pgo $ kubectl config set-context $(kubectl config current-context) --namespace=pgo
Note
To use different namespace, you should edit all occurrences of the
namespace: pgo
line in bothdeploy/cr.yaml
anddeploy/operator.yaml
configuration files. -
Deploy the operator with the following command:
$ kubectl apply -f deploy/operator.yaml
-
After the operator is started Percona Distribution for PostgreSQL can be created at any time with the following command:
$ kubectl apply -f deploy/cr.yaml
Creation process will take some time. The process is over when both operator and replica set pod have reached their Running status:
$ kubectl get pods
Expected output
NAME READY STATUS RESTARTS AGE backrest-backup-cluster1-j275w 0/1 Completed 0 10m cluster1-85486d645f-gpxzb 1/1 Running 0 10m cluster1-backrest-shared-repo-6495464548-c8wvl 1/1 Running 0 10m cluster1-pgbouncer-fc45869f7-s86rf 1/1 Running 0 10m pgo-deploy-rhv6k 0/1 Completed 0 5m postgres-operator-8646c68b57-z8m62 4/4 Running 1 5m
-
During previous steps, the Operator has generated several secrets, including the password for the
pguser
user, which you will need to access the cluster.Use
kubectl get secrets
command to see the list of Secrets objects (by default Secrets object you are interested in hascluster1-pguser-secret
name). Thenkubectl get secret cluster1-pguser-secret -o yaml
will return the YAML file with generated secrets, including the password which should look as follows:... data: ... password: cGd1c2VyX3Bhc3N3b3JkCg==
Here the actual password is base64-encoded, and
echo 'cGd1c2VyX3Bhc3N3b3JkCg==' | base64 --decode
will bring it back to a human-readable form (in this example it will be apguser_password
string). -
Check connectivity to newly created cluster. Run a new Pod to use it as a client and connect its console output to your terminal (running it may require some time to deploy). When you see the command line prompt of the newly created Pod, run
psql
tool using the password obtained from the secret. The following command will do this, naming the new Podpg-client
:$ kubectl run -i --rm --tty pg-client --image=perconalab/percona-distribution-postgresql:14.4 --restart=Never -- bash -il [postgres@pg-client /]$ PGPASSWORD='pguser_password' psql -h cluster1-pgbouncer -p 5432 -U pguser pgdb
This command will connect you to the PostgreSQL interactive terminal.
$ psql (14.4) Type "help" for help. pgdb=>