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Veritas InfoScale™ 8.0 Support for Containers - Linux

Last Published: 2021-12-21

Product(s): InfoScale & Storage Foundation (8.0)

Platform: Linux

Configuring Veritas Oracle Data Manager (VRTSodm)

Veritas Oracle Data Manager (VRTSodm) is offered as a part of InfoScale suite. With VRTSodm, Oracle Applications bypass caching and locks of the file system thus enabling a faster connection.

VRTSodm is enabled by the linking libodm.so with the Oracle Application. The I/O calls from Oracle Application are then routed through the ODM kernel module.

Following changes are needed to the Oracle database yaml file to enable it to run with Veritas ODM.

Update the VxFS Data Volume (<vxfs pvc>) in the following code and add it to the .yaml.
Note:
Oracle Container image requires the data volume to be mounted at /opt/oracle/oradata. This volume also needs to be writable by the 'oracle' (uid: 54321) user inside the container. VxFS data volume must be mounted at this path by using a PVC. To handle this permissions issue, the following initContainer can be used.
```
initContainers:
- name: fix-volume-permission
  image: ubuntu
  command:
  - sh
  - -c
  - mkdir -p /opt/oracle/oradata 
    && chown -R 54321:54321 /opt/oracle/oradata 
    && chmod 0700 /opt/oracle/oradata
  volumeMounts:
  - name: <vxfs pvc>
  mountPath: /opt/oracle/oradata
  readOnly: false
```

Add the following to your .yaml to disable DNFS.

args:
- sh
- -c
- cd /opt/oracle/product/19c/dbhome_1/rdbms/lib/ &&
 make -f ins_rdbms.mk dnfs_off && cd $WORKDIR &&
 $ORACLE_BASE/$RUN_FILE

Create a hostpath volume devodm in the .yaml, and mount at /dev/odm .
Note:
On selinux-enabled systems (including OpenShift), the Oracle database container must be run as privileged.
Use the libodm.so that Veritas provides. Run the following commands on the bastion/master nodes.
- oc/kubectl cp <infoscalepod>:/opt/VRTSodm/lib64/libodm.so.
- oc/kubectl create configmap libodm --from-file libodm.so.
- Mount libodm.so inside the oracle container as under
```
- name: libodm-cmapvol
  mountPath: /opt/oracle/product/19c/dbhome_1/rdbms/lib/odm/libodm.so
  subPath: libodm.so

volumes:
- name: libodm-cmapvol
  configMap:
    name: libodm
    items:
    - key: libodm.so
      path: libodm.so
```

Run your .yaml on the bastion mode of the OpenShift cluster or the master node of the Kubernetes cluster.

Alternatively, copy the following content and create a new file oracle-odm.yaml .

apiVersion: apps/v1
kind: Deployment
metadata:
  name: oracle-odm
  labels:
    app: oracledb
spec:
  replicas: 1
  selector:
    matchLabels:
      app: oracledb
  template:
    metadata:
      labels:
        app: oracledb
    spec:
      initContainers:
      - name: fix-volume-permission
        image: ubuntu
        command:
        - sh
        - -c
        - mkdir -p /opt/oracle/oradata && chown -R 54321:54321 
          /opt/oracle/oradata && chmod 0700 /opt/oracle/oradata 
        volumeMounts:
        - name: oracle-datavol
          mountPath: /opt/oracle/oradata
          readOnly: false
      containers:
      - name: oracle-app
        securityContext:
          privileged: true
        image:#replace this with the link for patched oracle container image
        imagePullPolicy: IfNotPresent
        # Modification to the args to disable dnfs before starting database
        args:
        - sh
        - -c
        - cd /opt/oracle/product/19c/dbhome_1/rdbms/lib/ && make -f 
             ins_rdbms.mk dnfs_off && cd $WORKDIR && $ORACLE_BASE/$RUN_FILE
        resources:
          requests:
            memory: 8Gi
        env:
        - name: ORACLE_SID
          value: "orainst1"
        - name: ORACLE_PDB
          value: orapdb1
        - name: ORACLE_PWD
          value: oracle
        ports:
        - name: listener
          containerPort: 1521
          hostPort: 1521
        volumeMounts:
        - name: oracle-datavol
          mountPath: /opt/oracle/oradata
          readOnly: false
        - name: devodm
          mountPath: /dev/odm
        - name: libodm-cmapvol
         mountPath: /opt/oracle/product/19c/dbhome_1/rdbms/lib/odm/libodm.so
          subPath: libodm.so
      volumes:
      - name: oracle-datavol
        persistentVolumeClaim:
          claimName: oracle-data-pvc
      - name: devodm
        hostPath:
          path: /dev/odm
          type: Directory
      - name: libodm-cmapvol
        configMap:
          name: libodm
          items:
          - key: libodm.so
            path: libodm.so
---
apiVersion: v1
kind: Service
metadata:
  name: ora-listener
  namespace: default
  labels:
    app: oracledb
spec:
  selector:
    app: oracledb
  type: NodePort
  ports:
  - name: ora-listener
    protocol: TCP
    port: 1521
    targetPort: 1521

Save the file.

Run the file on the bastion mode of the OpenShift cluster or the master node of the Kubernetes cluster to enable a faster connection.