Chainguard Container for postgres-operator

Creates and manages PostgreSQL clusters running in Kubernetes.

Chainguard Containers are regularly-updated, secure-by-default container images.

Download this Container Image

For those with access, this container image is available on cgr.dev:

docker pull cgr.dev/ORGANIZATION/postgres-operator:latest

Be sure to replace the ORGANIZATION placeholder with the name used for your organization's private repository within the Chainguard Registry.

Usage

The operator can be installed by using the provided Helm chart which saves you the manual steps. The charts for both the Postgres Operator and its UI are hosted via the gh-pages branch. They only work only with Helm v3. Helm v2 support was dropped with v1.8.0.

# add repo for postgres-operator
helm repo add postgres-operator-charts https://opensource.zalando.com/postgres-operator/charts/postgres-operator

# install the postgres-operator
helm install postgres-operator postgres-operator-charts/postgres-operator  \
 --set image.registry=cgr.dev \
 --set image.repository=chainguard/postgres-operator \
 --set image.tag=latest

Check if Postgres Operator is running

Starting the operator may take a few seconds. Check if the operator pod is running before applying a Postgres cluster manifest.

# if you've created the operator using yaml manifests
kubectl get pod -l name=postgres-operator

# if you've created the operator using helm chart
kubectl get pod -l app.kubernetes.io/name=postgres-operator

If the operator doesn't get into Running state, either check the latest K8s events of the deployment or pod with kubectl describe or inspect the operator logs:

kubectl logs "$(kubectl get pod -l name=postgres-operator --output='name')"

Create a Postgres cluster

If the operator pod is running it listens to new events regarding postgresql resources. Now, it's time to submit your first Postgres cluster manifest.

# create a Postgres cluster
cat <<EOF > "${TMPDIR}/minimal-postgres-manifest.yaml"
apiVersion: "acid.zalan.do/v1"
kind: postgresql
metadata:
  name: acid-minimal-cluster
spec:
  teamId: "acid"
  volume:
    size: 1Gi
  numberOfInstances: 2
  users:
    zalando:  # database owner
    - superuser
    - createdb
    foo_user: []  # role for application foo
  databases:
    foo: zalando  # dbname: owner
  preparedDatabases:
    bar: {}
  postgresql:
    version: "16"
EOF

kubectl create -f "${TMPDIR}/minimal-postgres-manifest.yaml"

After the cluster manifest is submitted and passed the validation the operator will create Service and Endpoint resources and a StatefulSet which spins up new Pod(s) given the number of instances specified in the manifest. All resources are named like the cluster. The database pods can be identified by their number suffix, starting from -0. They run the Spilo container image by Zalando. As for the services and endpoints, there will be one for the master pod and another one for all the replicas (-repl suffix). Check if all components are coming up. Use the label application=spilo to filter and list the label spilo-role to see who is currently the master.

# check the deployed cluster
kubectl get postgresql

# check created database pods
kubectl get pods -l application=spilo -L spilo-role

# check created service resources
kubectl get svc -l application=spilo -L spilo-role

Connect to the Postgres cluster via psql

# get name of master pod of acid-minimal-cluster
export PGMASTER=$(kubectl get pods -o jsonpath={.items..metadata.name} -l application=spilo,cluster-name=acid-minimal-cluster,spilo-role=master -n default)

# set up port forward
kubectl port-forward $PGMASTER 6432:5432 -n default

Open another CLI and connect to the database using e.g. the psql client. When connecting with a manifest role like foo_user user, read its password from the K8s secret which was generated when creating acid-minimal-cluster. As non-encrypted connections are rejected by default set SSL mode to require:

export PGPASSWORD=$(kubectl get secret postgres.acid-minimal-cluster.credentials.postgresql.acid.zalan.do -o 'jsonpath={.data.password}' | base64 -d)
export PGSSLMODE=require
psql -U postgres -h localhost -p 6432

What are Chainguard Containers?

Chainguard Containers are minimal container images that are secure by default.

In many cases, the Chainguard Containers tagged as :latest contain only an open-source application and its runtime dependencies. These minimal container images typically do not contain a shell or package manager. Chainguard Containers are built with Wolfi, our Linux undistro designed to produce container images that meet the requirements of a more secure software supply chain.

The main features of Chainguard Containers include:

• Minimal design, without unnecessary software bloat
• Daily builds to ensure container images are up-to-date with available security patches
• High quality build-time SBOMs attesting to the provenance of all artifacts within the image
• Verifiable signatures provided by Sigstore
• Reproducible builds with Cosign and apko (read more about reproducibility)

For cases where you need container images with shells and package managers to build or debug, most Chainguard Containers come paired with a -dev variant.

Although the -dev container image variants have similar security features as their more minimal versions, they feature additional software that is typically not necessary in production environments. We recommend using multi-stage builds to leverage the -dev variants, copying application artifacts into a final minimal container that offers a reduced attack surface that won’t allow package installations or logins.

Learn More

To better understand how to work with Chainguard Containers, please visit Chainguard Academy and Chainguard Courses.

In addition to Containers, Chainguard offers VMs and Libraries. Contact Chainguard to access additional products.

Trademarks

This software listing is packaged by Chainguard. The trademarks set forth in this offering are owned by their respective companies, and use of them does not imply any affiliation, sponsorship, or endorsement by such companies.