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
It is crucial to specify the right branch with
-boption while cloning the code on this step. Please be careful.
The next thing to do is to add the
pgonamespace 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
To use different namespace, you should edit all occurrences of the
namespace: pgoline in both
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 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
pguseruser, which you will need to access the cluster.
kubectl get secretscommand to see the list of Secrets objects (by default Secrets object you are interested in has
kubectl get secret cluster1-pguser-secret -o yamlwill 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 --decodewill bring it back to a human-readable form (in this example it will be a
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
psqltool using the password obtained from the secret. The following command will do this, naming the new Pod
$ 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=>