Deploying EDB containers in MiniShift/OpenShift

This blog refers to an older version of EDB’s Postgres on Kubernetes offering that is no longer available.

In this post we’ll look at how we can deploy EnterpriseDB containers in MiniShift. When you need to setup MiniShift have a look here. In this post we’ll do the setup with the MiniShift console, in a next post we’ll do the same by using the command line tools.

As a few containers will be running at the end MiniShift got more resources when it was started:

[email protected]:/opt$ minishift delete
[email protected]:/opt$ minishift start --cpus 4 --disk-size 30GB --memory 4GB

Once MiniShift is up and running open the MiniShift console and login as developer/admin:

[email protected]:/opt$ minishift console

The first thing we need to do is to grant the necessary permissions after we stepped into “My Project”:

The permission are in Resources->Membership. Add admin,edit and view to the default account:

For accessing the EnterpriseDB container repository a new secret needs to be created which contains the connection details. Secrets are under Resources->Secrets:

As databases are happy when they can store their data on persistent storage we need a volume. Volumes can be created under “Storage”:

Now we need a local registry where we can push the EnterpriseDB containers to:

[email protected]:~$ minishift ssh
                        ##         .
                  ## ## ##        ==
               ## ## ## ## ##    ===
           /"""""""""""""""""\___/ ===
      ~~~ {~~ ~~~~ ~~~ ~~~~ ~~~ ~ /  ===- ~~~
           \______ o           __/
             \    \         __/
              \____\_______/
 _                 _   ____     _            _
| |__   ___   ___ | |_|___ \ __| | ___   ___| | _____ _ __
| '_ \ / _ \ / _ \| __| __) / _` |/ _ \ / __| |/ / _ \ '__|
| |_) | (_) | (_) | |_ / __/ (_| | (_) | (__|   <  __/ |
|_.__/ \___/ \___/ \__|_____\__,_|\___/ \___|_|\_\___|_|
Boot2Docker version 1.12.6, build HEAD : 5ab2289 - Wed Jan 11 03:20:40 UTC 2017
Docker version 1.12.6, build 78d1802
[email protected]:~$ docker run -d -p 5000:5000 --restart=always --name registry registry:2
Unable to find image 'registry:2' locally
2: Pulling from library/registry
81033e7c1d6a: Pull complete 
...
Status: Downloaded newer image for registry:2
14e85f4e2a36e727a0584803e49bbd690ffdb092c02238a241bd2ad003680625
[email protected]:~$ docker login containers.enterprisedb.com
Username: dbi-services
Password: 
Login Succeeded
[email protected]:~$ docker pull containers.enterprisedb.com/edb/edb-as:v10.3
v10.3: Pulling from test/edb-as
d9aaf4d82f24: Pulling fs layer 
...
Status: Downloaded newer image for containers.enterprisedb.com/edb/edb-as:v10.3
[email protected]:~$ docker tag containers.enterprisedb.com/edb/edb-as:v10.3 localhost:5000/edb/edb-as:v10.3
[email protected]:~$ docker push localhost:5000/edb/edb-as:v10.3
The push refers to a repository [localhost:5000/edb/edb-as]
274db5c4ff47: Preparing 
...
[email protected]:~$ docker pull containers.enterprisedb.com/edb/edb-pgpool:v3.5
v3.5: Pulling from test/edb-pgpool
...
[email protected]:~$ docker tag containers.enterprisedb.com/edb/edb-pgpool:v3.5 localhost:5000/edb/edb-pgpool:v3.5
[email protected]:~$ docker push localhost:5000/edb/edb-pgpool:v3.5
The push refers to a repository [localhost:5000/edb/edb-pgpool]
8a7df26eb139: Pushed 
...

This is all what is required for the preparation. The next step is to import to the template which specifies the setup. For this little demo we’ll use this one:

apiVersion: v1
kind: Template
metadata:
   name: edb-as10-0
   annotations:
    description: "Standard EDB Postgres Advanced Server 10.0 Deployment Config"
    tags: "database,epas,postgres,postgresql"
    iconClass: "icon-postgresql"
objects:
- apiVersion: v1 
  kind: Service
  metadata:
    name: ${DATABASE_NAME}-service 
    labels:
      role: loadbalancer
      cluster: ${DATABASE_NAME}
  spec:
    selector:                  
      lb: ${DATABASE_NAME}-pgpool
    ports:
    - name: lb 
      port: ${PGPORT}
      targetPort: 9999
    sessionAffinity: None
    type: LoadBalancer
- apiVersion: v1 
  kind: DeploymentConfig
  metadata:
    name: ${DATABASE_NAME}-pgpool
  spec:
    replicas: 2
    selector:
      lb: ${DATABASE_NAME}-pgpool
    strategy:
      resources: {}
      rollingParams:
        intervalSeconds: 1
        maxSurge: 25%
        maxUnavailable: 25%
        timeoutSeconds: 600
        updatePeriodSeconds: 1
      type: Rolling
    template:
      metadata:
        labels:
          lb: ${DATABASE_NAME}-pgpool
          role: queryrouter
          cluster: ${DATABASE_NAME}
      spec:
        containers:
        - name: edb-pgpool
          env:
          - name: DATABASE_NAME
            value: ${DATABASE_NAME} 
          - name: PGPORT
            value: ${PGPORT} 
          - name: REPL_USER
            value: ${REPL_USER} 
          - name: ENTERPRISEDB_PASSWORD
            value: 'postgres' 
          - name: REPL_PASSWORD
            value: 'postgres' 
          - name: ACCEPT_EULA
            value: ${ACCEPT_EULA}
          image: containers.enterprisedb.com/edb/edb-pgpool:v3.5
          imagePullPolicy: IfNotPresent
          readinessProbe:
            exec:
              command:
              - /var/lib/edb/testIsReady.sh
            initialDelaySeconds: 60
            timeoutSeconds: 5
    triggers:
    - type: ConfigChange
- apiVersion: v1
  kind: DeploymentConfig
  metadata:
    name: ${DATABASE_NAME}-as10-0
  spec:
    replicas: 1
    selector:
      db: ${DATABASE_NAME}-as10-0 
    strategy:
      resources: {}
      rollingParams:
        intervalSeconds: 1
        maxSurge: 25%
        maxUnavailable: 25%
        timeoutSeconds: 600
        updatePeriodSeconds: 1
      type: Rolling
    template:
      metadata:
        creationTimestamp: null
        labels:
          db: ${DATABASE_NAME}-as10-0 
          cluster: ${DATABASE_NAME}
      spec:
        containers:
        - name: edb-as10 
          env:
          - name: DATABASE_NAME 
            value: ${DATABASE_NAME} 
          - name: DATABASE_USER 
            value: ${DATABASE_USER} 
          - name: DATABASE_USER_PASSWORD
            value: 'postgres' 
          - name: ENTERPRISEDB_PASSWORD
            value: 'postgres' 
          - name: REPL_USER
            value: ${REPL_USER} 
          - name: REPL_PASSWORD
            value: 'postgres' 
          - name: PGPORT
            value: ${PGPORT} 
          - name: RESTORE_FILE
            value: ${RESTORE_FILE} 
          - name: LOCALEPARAMETER
            value: ${LOCALEPARAMETER}
          - name: CLEANUP_SCHEDULE
            value: ${CLEANUP_SCHEDULE}
          - name: EFM_EMAIL
            value: ${EFM_EMAIL}
          - name: NAMESERVER
            value: ${NAMESERVER}
          - name: POD_NAMESPACE
            valueFrom:
              fieldRef:
                fieldPath: metadata.namespace
          - name: POD_NODE
            valueFrom:
              fieldRef:
                fieldPath: spec.nodeName 
          - name: POD_IP
            valueFrom:
              fieldRef:
                fieldPath: status.podIP 
          - name: ACCEPT_EULA
            value: ${ACCEPT_EULA}
          image: containers.enterprisedb.com/edb/edb-as:v10.3
          imagePullPolicy: IfNotPresent 
          readinessProbe:
            exec:
              command:
              - /var/lib/edb/testIsReady.sh
            initialDelaySeconds: 60
            timeoutSeconds: 5 
          livenessProbe:
            exec:
              command:
              - /var/lib/edb/testIsHealthy.sh
            initialDelaySeconds: 600 
            timeoutSeconds: 60 
          ports:
          - containerPort: ${PGPORT} 
          volumeMounts:
          - name: ${PERSISTENT_VOLUME}
            mountPath: /edbvolume
        dnsPolicy: ClusterFirst
        restartPolicy: Always
        volumes:
        - name: ${PERSISTENT_VOLUME}
          persistentVolumeClaim:
            claimName: ${PERSISTENT_VOLUME_CLAIM}
    triggers:
    - type: ConfigChange
parameters:
- name: DATABASE_NAME
  displayName: Database Name
  description: Name of Postgres database (leave edb for default)
  value: 'edb'
- name: DATABASE_USER
  displayName: Default database user (leave enterprisedb for default)
  description: Default database user
  value: 'enterprisedb'
- name: REPL_USER
  displayName: Repl user
  description: repl database user
  value: 'repl'
- name: PGPORT
  displayName: Database Port
  description: Database Port (leave 5444 for default)
  value: "5444"
- name: LOCALEPARAMETER
  displayName: Locale
  description: Locale of database
  value: ''
- name: CLEANUP_SCHEDULE
  displayName: Host Cleanup Schedule
  description: Standard cron schedule - min (0 - 59), hour (0 - 23), day of month (1 - 31), month (1 - 12), day of week (0 - 6) (0 to 6 are Sunday to Saturday, or use names; 7 is Sunday, the same as 0). Leave it empty if you dont want to cleanup.
  value: '0:0:*:*:*'
- name: EFM_EMAIL
  displayName: Email
  description: Email for EFM
  value: '[email protected]'
- name: NAMESERVER
  displayName: Name Server for Email
  description: Name Server for Email
  value: '8.8.8.8'
- name: PERSISTENT_VOLUME
  displayName: Persistent Volume
  description: Persistent volume name
  value: ''
  required: true
- name: PERSISTENT_VOLUME_CLAIM 
  displayName: Persistent Volume Claim
  description: Persistent volume claim name
  value: ''
  required: true
- name: RESTORE_FILE
  displayName: Restore File
  description: Restore file location
  value: ''
- name: ACCEPT_EULA
  displayName: Accept end-user license agreement (leave 'Yes' for default)
  description: Indicates whether user accepts the end-user license agreement
  value: 'Yes'
  required: true

For importing that into OpenShift go to “Overview” and select “Import YAML/JSON”:

This imports the template but does not process it right now. When you go back to “Overview” you should see a new template which you can provision:

Selecting the new template brings you to the specification of the variables. The only bits you need to adjust are the values for the volume and the volume claim:

A few moments later the EDB containers are up and running:

[email protected]:~$ oc get pods
NAME                 READY     STATUS    RESTARTS   AGE
edb-as10-0-1-fdr5j   1/1       Running   0          1m
edb-pgpool-1-9twmc   1/1       Running   0          1m
edb-pgpool-1-m5x44   1/1       Running   0          1m

Current there are two pgpool instances and one database instance container. You can double check that the instance is really running with:

[email protected]:~$ oc rsh edb-as10-0-1-fdr5j
sh-4.2$ psql postgres
psql.bin (10.3.8)
Type "help" for help.

postgres=# select version();
                                                   version                                                   
-------------------------------------------------------------------------------------------------------------
 EnterpriseDB 10.3.8 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-16), 64-bit
(1 row)

Going back to the “Overview” page in the console shows the same information:

In the next post we’ll scale up the deployment by adding two replicas and configure access from outside the cluster.