The Very, VERY Quick Installation

If your environment is set up to use hostpath storage (found in things like minikube or OpenShift Code Ready Containers, the following command could work for you:

kubectl create namespace pgo
kubectl apply -f https://raw.githubusercontent.com/CrunchyData/postgres-operator/v4.4.0/installers/kubectl/postgres-operator.yml

If not, please read onward: you can still get up and running fairly quickly with just a little bit of configuration.

The Quick Installation

Step 1: Configuration

Get the PostgreSQL Operator Installer Manifest

You will need to download the PostgreSQL Operator Installer manifest to your environment, which you can do with the following command:

curl https://raw.githubusercontent.com/CrunchyData/postgres-operator/v4.4.0/installers/kubectl/postgres-operator.yml > postgres-operator.yml

Configure the PostgreSQL Operator Installer

There are many configuration parameters to help you fine tune your installation, but there are a few that you may want to change to get the PostgreSQL Operator to run in your environment. Open up the postgres-operator.yml file and edit a few variables.

Find the PGO_ADMIN_PASSWORD variable. This is the password you will use with the pgo client to manage your PostgreSQL clusters. The default is password, but you can change it to something like hippo-elephant.

You will need also need to set the storage default storage classes that you would like the PostgreSQL Operator to use. These variables are called PRIMARY_STORAGE, REPLICA_STORAGE, BACKUP_STORAGE, and BACKREST_STORAGE. There are several storage configurations listed out in the configuration file under the heading STORAGE[1-9]_TYPE. Find the one that you want to use, and set it to that value.

For example, if your Kubernetes environment is using NFS storage, you would set these variables to the following:

- name: BACKREST_STORAGE
  value: "nfsstorage"
- name: BACKUP_STORAGE
  value: "nfsstorage"
- name: PRIMARY_STORAGE
  value: "nfsstorage"
- name: REPLICA_STORAGE
  value: "nfsstorage"

For a full list of available storage types that can be used with this installation method, please review the configuration parameters.

Step 2: Installation

Installation is as easy as executing:

kubectl create namespace pgo
kubectl apply -f postgres-operator.yml

This will launch the pgo-deployer container that will run the various setup and installation jobs. This can take a few minutes to complete depending on your Kubernetes cluster.

While the installation is occurring, download the pgo client set up script. This will help set up your local environment for using the PostgreSQL Operator:

curl https://raw.githubusercontent.com/CrunchyData/postgres-operator/v4.4.0/installers/kubectl/client-setup.sh > client-setup.sh
chmod +x client-setup.sh

When the PostgreSQL Operator is done installing, run the client setup script:

./client-setup.sh

This will download the pgo client and provide instructions for how to easily use it in your environment. It will prompt you to add some environmental variables for you to set up in your session, which you can do with the following commands:

export PGOUSER="${HOME?}/.pgo/pgo/pgouser"
export PGO_CA_CERT="${HOME?}/.pgo/pgo/client.crt"
export PGO_CLIENT_CERT="${HOME?}/.pgo/pgo/client.crt"
export PGO_CLIENT_KEY="${HOME?}/.pgo/pgo/client.key"
export PGO_APISERVER_URL='https://127.0.0.1:8443'
export PGO_NAMESPACE=pgo

If you wish to permanently add these variables to your environment, you can run the following:

cat <<EOF >> ~/.bashrc
export PGOUSER="${HOME?}/.pgo/pgo/pgouser"
export PGO_CA_CERT="${HOME?}/.pgo/pgo/client.crt"
export PGO_CLIENT_CERT="${HOME?}/.pgo/pgo/client.crt"
export PGO_CLIENT_KEY="${HOME?}/.pgo/pgo/client.key"
export PGO_APISERVER_URL='https://127.0.0.1:8443'
export PGO_NAMESPACE=pgo
EOF

source ~/.bashrc

NOTE: For macOS users, you must use ~/.bash_profile instead of ~/.bashrc

Step 3: Verification

Below are a few steps to check if the PostgreSQL Operator is up and running.

By default, the PostgreSQL Operator installs into a namespace called pgo. First, see that the the Kubernetes Deployment of the Operator exists and is healthy:

kubectl -n pgo get deployments

If successful, you should see output similar to this:

NAME                READY   UP-TO-DATE   AVAILABLE   AGE
postgres-operator   1/1     1            1           16h

Next, see if the Pods that run the PostgreSQL Operator are up and running:

kubectl -n pgo get pods

If successful, you should see output similar to this:

NAME                                READY   STATUS    RESTARTS   AGE
postgres-operator-56d6ccb97-tmz7m   4/4     Running   0          2m

Finally, let's see if we can connect to the PostgreSQL Operator from the pgo command-line client. The Ansible installer installs the pgo command line client into your environment, along with the username/password file that allows you to access the PostgreSQL Operator. In order to communicate with the PostgreSQL Operator API server, you will first need to set up a port forward to your local environment.

In a new console window, run the following command to set up a port forward:

kubectl -n pgo port-forward svc/postgres-operator 8443:8443

Back to your original console window, you can verify that you can connect to the PostgreSQL Operator using the following command:

pgo version

If successful, you should see output similar to this:

pgo client version 4.4.0
pgo-apiserver version 4.4.0

Step 4: Have Some Fun - Create a PostgreSQL Cluster

The quickstart installation method creates a namespace called pgo where the PostgreSQL Operator manages PostgreSQL clusters. Try creating a PostgreSQL cluster called hippo:

pgo create cluster -n pgo hippo

Alternatively, because we set the PGO_NAMESPACE environmental variable in our .bashrc file, we could omit the -n flag from the pgo create cluster command and just run this:

pgo create cluster hippo

Even with PGO_NAMESPACE set, you can always overwrite which namespace to use by setting the -n flag for the specific command. For explicitness, we will continue to use the -n flag in the remaining examples of this quickstart.

If your cluster creation command executed successfully, you should see output similar to this:

created Pgcluster hippo
workflow id 1cd0d225-7cd4-4044-b269-aa7bedae219b

This will create a PostgreSQL cluster named hippo. It may take a few moments for the cluster to be provisioned. You can see the status of this cluster using the pgo test command:

pgo test -n pgo hippo

When everything is up and running, you should see output similar to this:

cluster : hippo
	Services
		primary (10.97.140.113:5432): UP
	Instances
		primary (hippo-7b64747476-6dr4h): UP

The pgo test command provides you the basic information you need to connect to your PostgreSQL cluster from within your Kubernetes environment. For more detailed information, you can use pgo show cluster -n pgo hippo.