OpenShift Container Platform 4.6 on DL Servers

# Storage Option

# CSI Driver Architecture

A diagrammatic representation of the CSI driver architecture is illustrated in the figure 16.

Figure 16: CSI Driver Architecture

The OpenShift Container Platform 4.6 cluster comprises the master and worker nodes (physical and virtual) with CoreOS deployed as the operating system. The iSCSI interface configured on the host nodes establishes the connection with the HPE 3PAR array to the cluster. Upon successful deployment of CSI Driver, the CSI controller, CSI Driver, and 3PAR CSP gets deployed which communicates with the HPE 3PAR array via REST APIs. The associated features on Storage Class such as CSI Provisioner, CSI Attacher, and others are configured on the Storage Class.

# Configuring CSI Driver

Prior to configuring the HPE CSI driver, the following Prerequisites needs to be met.

Prerequisites

  1. OpenShift Container Platform 4.6 must be successfully deployed and console should be accessible.
  2. iSCSI interface should be configured for HPE 3PAR Storage on Host server.
  3. Additional iSCSI network interfaces must be configured on worker nodes (physical and virtual).
  4. Deploy scc.yaml file to enable Security Context Constraints (SCC).

NOTE

To get access to the host ports, host network, and to mount the host path volume, the HPE CSI Driver needs to be run in privileged mode. Prior to deployment of the CSI operator on OpenShift, createSCC to allow CSI driver to run with these privileges. Download SCC yaml file from GitHub https://raw.githubusercontent.com/hpe-storage/co-deployments/master/operators/hpe-csi-operator/deploy/scc.yaml (opens new window) and update relevant fields such as project or namespace before running the yaml to deploy SCC.

# Configuring iSCSI interface on worker nodes

Additional iSCSI interface needs to be configured on all the worker nodes (physical and virtual) for establishing the connection between the OCP cluster and HPE 3PAR array. iSCSI_A and iSCSI_B interfaces needs to be configured on the worker nodes for redundancy. Follow the steps as listed to configure the additional interface.

  1. Create interface configuration files (ifcfg files) on each of the worker nodes by specifying the following parameters.

    HWADDR=52:4D:1F:20:01:94 (MAC address of the iSCSI connector)
TYPE=Ethernet
BOOTPROTO=none
IPADDR=40.0.17.221 
PREFIX=16
DNS1= 20.1.1.254
ONBOOT=yes

  2. Reboot the worker nodes after configuring the ifcfg files. The 3PAR Discovery IP should be pingable.

    For virtual worker nodes, additional network adapters are added and the corresponding network port groups are selected.

# iSCSI Interface for physical worker nodes

For physical worker nodes, iSCSI_A connection for storage interface and additional iSCSI_B connection is added for redundancy.

# Steps to deploy SCC

The following figure shows the parameters that needs to be edited (project name) where the CSI Operator is being deployed.

  1. From the Installer vm, download the scc.yaml file from GitHub from the following path. curl -sL https://raw.githubusercontent.com/hpe-storage/co-deployments/master/operators/hpe-csi-operator/deploy/scc.yaml (opens new window) hpe-csi-scc.yaml

  2. Edit relevant parameters such as Project name and save the file.

  3. Deploy SCC and check the output

    > oc create -f hpe-csi-scc.yaml

    Output:

    securitycontextconstraints.security.openshift.io/hpe-csi-scc created

# Installing HPE CSI Driver on an existing Red Hat OpenShift Container Platform

# Creating Namespace

Before installing the CSI Driver from the OpenShift console, create a namespace called HPE-CSI Driver. Perform the following steps to create a Namespace.

  1. Click Administration → Namespaces in the left pane of the Console.

  2. Click Create Namespaces.

  3. In the Create Namespace dialogbox -> enter HPE- CSI.

  4. Click Create.

# Installing Red Hat HPE CSI Driver Operator using the Operator Hub

# Installing HPE CSI Driver Operator

  1. Login to the Red Hat OpenShift Container Platform Web Console.

  2. Click Operators → Operator Hub.

  3. Search for HPE CSI Driver Operator from the list of operators and click HPE CSI Driver operator.

  4. On the HPE-CSI Operator page, click Install.

  5. On the Create Operator Subscription page, the Installation Mode, Update Channel and Approval Strategy options are available.

  6. Select an Approval Strategy. The available options are:

    • Automatic: Specifies that the OpenShift Container Platform is required to upgrade HPE CSI

    • Storage automatically. Select the Automatic option.

    • Manual: Specifies that you need to upgrade to OpenShift Container Platform manually.

  7. Click Subscribe. The Installed Operators page is displayed with the status of the operator as shown.

# Creating HPE CSI driver

The HPE CSI Driver allows any vendor or project to develop its own Container Storage Provider by using the CSP specification (opens new window). This makes it very easy for third- parties to integrate their storage solution into Kubernetes as all the intricacies are taken care of by the HPE CSI Driver.

To create HPE CSI driver, perform the following steps.

  1. Click Operators → Installed Operators from the left pane of the OpenShift Web Console to view the installed operators.

  2. On the Installed Operator page, select HPE CSI Driver from the Project drop down list to switch to the HPE-CSI project

  3. Click HPE CSI Driver.

  4. On the HPE CSI Driver Operator page, scroll right and click the HPE CSI Driver yaml file.

  5. Edit the HPE CSI Driver yaml file with required values like backend (3PAR array IP), password and username as shown.

  6. On the HPE CSI Driver Operator page, scroll right and click the HPECSI Driver tab as shown.

# Verifying creation of HPE CSI Driver

After the HPECSI Driver is deployed, one can see the associated deployment pods being created such as hpe-csi-controller, hpe-csi-driver, and primera3par-csp.

To verify the HPE CSI Node Info, perform the following steps.

  1. Run the following command from the Installer VM to check HPENodeinfo and network status of worker nodes.

    > oc get HPENodeInfo

    > oc get HPENodeInfo/<workernode fqdn> -o yaml

# HPE CSI Driver Storage installation

After installing HPE CSI Driver, Storage Class is created manually.

  1. From the OpenShift console navigate to Storage -> Storage Class

  2. Click Create Storage Class -> Click Edit yaml -> insert the parameters for SC creation -> Click Create.

  3. 'hpe-standard' storage class is created as shown.

Run the following command on the CLI to tag the storage class default-storage class by :

> oc annotate storageclass hpe-standard storageclass.kubernetes.io/is-default-class=true

The create Storage Class yaml file parameters are as follows:

    apiVersion: storage.k8s.io/v1
    kind: StorageClass
    metadata:
      name: hpe-standard
    provisioner: csi.hpe.com
    parameters:
      csi.storage.k8s.io/fstype: ext4
      csi.storage.k8s.io/controller-expand-secret-name: primera3par-secret
      csi.storage.k8s.io/controller-expand-secret-namespace: hpe-csi
      csi.storage.k8s.io/controller-publish-secret-name: primera3par-secret
      csi.storage.k8s.io/controller-publish-secret-namespace: hpe-csi
      csi.storage.k8s.io/node-publish-secret-name: primera3par-secret
      csi.storage.k8s.io/node-publish-secret-namespace: hpe-csi
      csi.storage.k8s.io/node-stage-secret-name: primera3par-secret
      csi.storage.k8s.io/node-stage-secret-namespace: hpe-csi
      csi.storage.k8s.io/provisioner-secret-name: primera3par-secret
      csi.storage.k8s.io/provisioner-secret-namespace: hpe-csi
      cpg: SSD_r6 
      provisioning_type: tpvv
      accessProtocol: iscsi
    reclaimPolicy: Delete
    allowVolumeExpansion: true

NOTE

From the worker node, ssh to the 3PAR array to check on the cpg values for Storage Class creation as shown.

# Sample application deployment

A sample application deployed on the existing Red Hat OpenShift Container Platform utilizes the volume from 3PAR array through HPE CSI Driver. A sample application such as mongodb or mariadb is deployed and scheduled on the worker nodes. Follow the steps to deploy a sample application.

  1. Run the following command to deploy a sample application.

    > oc new-app mongodb-persistent

  2. Check the status of PVC and Pod.

    List of pods created on the cluster along with the one for sample application deployed is shown.

    PVC for the sample application deployed is created and bound. This can be verified in the OpenShift Console by navigating to Storage -> Persistent Volume Claim section.

# Verification of Persistent Volume Claim on 3PAR array

The PVC created for the sample application deployed (mongodb) can be verified on the 3PAR array by searching for the PVC id seen on the console or on the CLI.

NOTE

The PVC ID is not completely seen on 3PAR console as it gets truncated beyond 30 characters.

Steps to verify the PVC on 3PAR array:

  1. Login to the 3PAR SSMC URL at https://10.0.20.19:8443/#/login with appropriate credentials.

  2. Navigate from the drop- down menu option on 3PAR StoreServ -> Virtual volumes

  3. The volume for the PVC created can be seen under the list of virtual volume as shown.

# OpenShift Persistent Volume Expansion

The volume of the sample application deployed can be expanded by specifying the volume size on the OpenShift console. The steps for PVC expansion is as follows.

  1. On the OpenShift web console navigate to Storage -> Persistent Volume Claims -> select a specific pod -> click on the dots seen towards the right side -> select 'Expand PVC'

  1. Change the volume size from 1Gi to 3Gi and click Expand button as shown.

  2. Now, you can see PVC and PV has been resized to 3 GB.

# CSI Driver

CSI was developed as a standard for exposing block and file storage systems to containerized workloads on Container Orchestrator Systems (COS) like Kubernetes. Container Storage Interface (CSI) is an initiative to unify the storage interface of COS combined with storage vendors. This means, implementing a single CSI for a storage vendor is guaranteed to work with all COS. With the introduction of CSI, there is a clear benefit for the COS and storage vendors. Due to its well-defined interfaces, it also helps developers and future COS to easily implement and test CSI. Volume plugins served the storage needs for container workloads in case of Kubernetes, before CSI existed. The HPE CSI Driver is a multi-vendor and multi-backend driver where each implementation has a Container Storage Provider (CSP). The HPE CSI Driver for Kubernetes uses CSP to perform data management operations on storage resources such as searching for a logical unit number (lun) and so on. Using the CSP specification, the HPE CSI Driver allows any vendor or project to develop its own CSP, which makes it very easy for third- parties to integrate their storage solution into Kubernetes as all the intricacies are taken care of by the HPE CSI Driver.

This document contains details on how to configure a HPE CSI Driver storage for 3PAR on an existing Red Hat OpenShift Container Platform 4.6.

# Deploying HPE CSI Driver Nimble Storage on OCP 4.6

# Configuring iSCSI interface on worker nodes

Additional iSCSI interface needs to be configured on all the worker nodes (physical and virtual) for establishing the connection between the OCP cluster and HPE Nimble array. iSCSI_A and iSCSI_B interfaces needs to be configured on the worker nodes for redundancy.

Follow the steps as- listed to configure the additional interface.

  1. Create interface configuration files (ifcfg files) on each of the worker nodes by specifying the following parameters.
    HWADDR=52:4D:1F:20:01:94 (MAC address of the iSCSI connector)
    TYPE=Ethernet
    BOOTPROTO=none
    IPADDR=40.0.17.221 
    PREFIX=16
    DNS1= 20.1.1.254
    ONBOOT=yes

  1. Reboot the worker nodes after configuring the ifcfg files. The Nimble Discovery IP should be pingable.

    For virtual worker nodes, additional Network adapters are added and the corresponding network port groups are selected.

# iSCSI Interface for Physical worker nodes

For Physical worker nodes, iSCSI_A connection for storage interface and additional iSCSI_B connection is added for redundancy.

# OpenShift Persistent Volume Expansion

The volume of the sample application deployed can be expanded by specifying the volume size on the OpenShift console. The steps for PVC expansion is listed as follows.

  1. On the OpenShift web console navigate to Storage -> Persistent Volume Claims -> select a specific pod -> click on the dots seen towards the right side -> select 'Expand PVC'

  1. Change the volume size from 1Gi to 3Gi and click Expand button.

  1. Now you can see PVC and PV has been resized to 3 GB.

# Deploying Openshift Container Storage

This section covers deploying OpenShift Container Storage 4.5 on existing Red Hat OpenShift Container Platform 4.6 worker nodes.

The OpenShift Container Storage operator installation will be using Local Storage operator which will use file system storage of 10GB for monitoring purpose and block storage of 500GB/2TB for OSD (Object Storage Daemon) volumes. These OSD are useful for configuring any application on top of OCP cluster using OCS configuration.

Figure 17. Logical storage Layout in Solution

The below operators are required to create OCS cluster and deployed through automation fashion.

  • Local Storage Operator

  • OpenShift Container Storage Operator

# Flow Diagram

Figure 18. Deploying OpenShift Container Storage Solution Flow Diagram

# Configuration requirements

The below table shows about all required worker node configuration.

Server Role CPU RAM HardDisk1 HardDiak2 HardDisk3
Worker 16 64 120 GB 10 GB 500 GB/2 TB

# Pre-requisites

  1. Red Hat OpenShift Container Platform 4.6 cluster console is required with the login credentials.

  2. Availability of any local storage from any storage (i.e Nimble,3PAR,Local Storage) in OpenShift Container Platform.

  3. OCS installation on OCP 4.6 cluster requires a minimum of 3 worker nodes but OCS should have exact 3 worker nodes which use two more hard disks with 10GB for mon POD (3 in total using always a PVC) + 500GB (or more than 500GB) volume (a PVC using the default "thin" storage class) for the OSD volumes. It also requires 16 CPUs and 64GB RAM for each node and worker node hard disk configuration as shown in above figure.

# Scripts for deploying OCS cluster

NOTE

BASE_DIR - is a base directory path for all automated scripts directories are in place and path is /opt/hpe/solutions/ocp/hpe-solutions-openshift/DL/scalable

This section provides details on the scripts developed to automate the installation of OCS operator on the OCP cluster. The scripts used to deploy OCS can be found in the installer VM at $BASE_DIR/ocs_installation.

  1. install_ocs_operator.py - main python script which installs Local Storage operator, OpenShift Container Storage operators, creates file system & block storage and also creates SCs, PVs, PVCs.

  2. config.py - This python script is used to convert user input values into program variables for usage by the install_ocs_operator.py script.

  3. userinput.json - The userinput.json file needs to be modified as per user configuration and requirements for installing and scaling OCS cluster.

  4. config_secrets.json -- This encrypted file has OCP cluster login credentials and user needs to provide credentials to this file using 'ansible-vault' command.

  5. create_local_storage_operator.yaml -- Creates Local Storage operator's Namespace, installs Local Storage operator.

  6. local_storage_fs.yaml -- Creates file system storage for monitoring OCS cluster.

  7. local_storage_block.yaml -- Creates block storage for claiming OSD persistent volumes.

  8. ocs_operator.yaml -- This playbook creates OpenShift Container Storage Namespace, block storage for bounding PVC to Storage Class.

  9. storage_ocs.yaml -- This playbook creates storage classes, PVCs, pods to bring up the OCS cluster.

  10. scaling_ocs_operator.py - This python script is used to scale OCS cluster by expanding OCS storage with 3 more worker nodes.

# Installing OpenShift Container Storage on OpenShift Container Platform

  1. Login to the installer machine as non-root user and browse to python virtual environment as per DG.

  2. Update the config_secrets.json file found at $BASE_DIR/ocs_installation using 'ansible-vault' command as shown below:

    The below command is used to open encrypted file config_secrets.json

    > ansible-vault edit config_secrets.json

    > OPENSHIFT_USERNAME: <OpenShift Container Platform cluster username>

    > OPENSHIFT_PASSWORD: <OpenShift Container Platform cluster password>

  3. Update the userinput.json file is found at $BASE_DIR/ocs_installation with the following setup configuration details:

    OPENSHIFT_DOMAIN: "<OpenShift Server sub domain fqdn (api.domain.base_domain)>",

OPENSHIFT_PORT: "<OpenShift Server port number (OpenShift Container Platform runs on port 6443 by default)>",

LOCAL_STORAGE_NAMESPACE: "<Local Storage Operator Namespace (local-storage)>",

OPENSHIFT_CONTAINER_STORAGE_NAMESPACE: "<OpenShift Container Storage Operator Namespace (openshift-storage)>",

OPENSHIFT_CONTAINER_STORAGE_LOCAL_STORAGE_VERSION:"<OCP_cluster_version>",

OPENSHIFT_CONTAINER_STORAGE_FILESYSTEM_STORAGE: "<Provide 10GiB worker node's drive for file system storage (Ex: /dev/sdb)>" ,

OPENSHIFT_CONTAINER_STORAGE_BLOCK_STORAGE: "<Provide 500Gi worker node's drive for block storage (Ex: /dev/sdc)>",

OPENSHIFT_CLIENT_PATH: "<Provide oc absolute path ending with / OR leave empty in case oc is available under /usr/local/bin>",

"OPENSHIFT_CONTAINER_PLATFORM_WORKER_NODES": <Provide OCP worker nodes fqdn list ["sworker1.fqdn", "sworker2.fqdn","worker3.fqdn"]>,

"OPENSHIFT_CONTAINER_STORAGE_SCALING_WORKER_NODES": <Provide OCS worker nodes fqdn list ["sworker4.fqdn", "sworker5.fqdn", "sworker6.fqdn"]>,

"OPENSHIFT_CONTAINER_STORAGE_BLOCK_VOLUME": "<Provide base/scale OCS worker node block storage, should be in Gi/Ti (example 500Gi or 2Ti)>"

  4. Execute the following command to deploy OCS cluster.

    > cd $BASE_DIR/ocs_installation

    > python -W ignore install_ocs_operator.py

    The output of the above command as shown below:

    > python -W ignore install_ocs_operator.py

    Enter key for encrypted variables:

Logging into your OpenShift Cluster

Successfully logged into the OpenShift Cluster

Waiting for 1 minutes to 'Local Storage' operator to be available on OCP web console..!!

'Local Storage' operator is created..!!

Waiting for 2 minutes to OCS operator to be available on OCP web console..!!

'OpenShift Container Storage' operator is created..!!

INFO:

1) Run the below command to list all PODs and PVCs of OCS cluster.

  'oc get pod,pvc -n openshift-storage'

2) Wait for 'pod/ocs-operator-xxxx' pod to be up and running.

3) Log into OCP web GUI and check Persistant Stoarge in dashboard.

$

# Validation of the OpenShift Container Storage cluster

The required operators will be created after the execution of the script and they will be reflected in the OpenShift console. This section outlines the steps to verify the operators created through script and are reflected in the GUI:

  1. Login to the OpenShift Container Platform web console as the user with administrative privileges.

  2. Navigate to Operators -> Project (local-storage) -> Installed Operators select your project name.

  3. The Local Storage operator will be available in the OpenShift web console as shown in below Figure.

  4. Navigate to Operators -> Installed Operators select your project name openshift-storage for OpenShift Container Storage operator.

  5. The OpenShift Container Storage operator will be available on the OpenShift Container Platformm web console as shown in below Figure.

  6. SCs of OpenShift Container Storage operator on CLI as shown in below.

    > oc get sc

    NAME                          PROVISIONER                             RECLAIMPOLICY   VOLUMEBINDINGMODE      ALLOWVOLUMEEXPANSION   AGE
local-sc                      kubernetes.io/no-provisioner            Delete          WaitForFirstConsumer   false                  45h
localblock-sc                 kubernetes.io/no-provisioner            Delete          WaitForFirstConsumer   false                  45h
ocs-storagecluster-ceph-rbd   openshift-storage.rbd.csi.ceph.com      Delete          Immediate              false                  45h
ocs-storagecluster-cephfs     openshift-storage.cephfs.csi.ceph.com   Delete          Immediate              false                  45h
openshift-storage.noobaa.io   openshift-storage.noobaa.io/obc         Delete          Immediate              false                  45h

  7. PVs of OpenShift Container Storage operator on CLI as shown in below.

    > oc get pv

    NAME                                       CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS   CLAIM                                       STORAGECLASS                  REASON   AGE
local-pv-2febb788                          500Gi      RWO            Delete           Bound    openshift-storage/ocs-deviceset-1-0-lhtvh   localblock-sc                          45h
local-pv-5f19c0e5                          10Gi       RWO            Delete           Bound    openshift-storage/rook-ceph-mon-b           local-sc                               45h
local-pv-b73b1cd5                          500Gi      RWO            Delete           Bound    openshift-storage/ocs-deviceset-2-0-jmmck   localblock-sc                          45h
local-pv-b8ba8c38                          10Gi       RWO            Delete           Bound    openshift-storage/rook-ceph-mon-a           local-sc                               45h
local-pv-c3a372f6                          10Gi       RWO            Delete           Bound    openshift-storage/rook-ceph-mon-c           local-sc                               45h
local-pv-e5e3d596                          500Gi      RWO            Delete           Bound    openshift-storage/ocs-deviceset-0-0-5jxg7   localblock-sc                          45h
pvc-8f3e3d8b-6be7-4ba8-8968-69cbc866c89f   50Gi       RWO            Delete           Bound    openshift-storage/db-noobaa-db-0            ocs-storagecluster-ceph-rbd            45h
 $

  8. PVCs of OpenShift Container Storage operator on CLI as shown in below.

    > oc get pvc -n openshift-storage

    NAME                      STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS                  AGE
db-noobaa-db-0            Bound    pvc-8f3e3d8b-6be7-4ba8-8968-69cbc866c89f   50Gi       RWO            ocs-storagecluster-ceph-rbd   45h
ocs-deviceset-0-0-5jxg7   Bound    local-pv-e5e3d596                          500Gi      RWO            localblock-sc                 45h
ocs-deviceset-1-0-lhtvh   Bound    local-pv-2febb788                          500Gi      RWO            localblock-sc                 45h
ocs-deviceset-2-0-jmmck   Bound    local-pv-b73b1cd5                          500Gi      RWO            localblock-sc                 45h
rook-ceph-mon-a           Bound    local-pv-b8ba8c38                          10Gi       RWO            local-sc                      45h
rook-ceph-mon-b           Bound    local-pv-5f19c0e5                          10Gi       RWO            local-sc                      45h
rook-ceph-mon-c           Bound    local-pv-c3a372f6                          10Gi       RWO            local-sc                      45h
 $

  9. PODs of OpenShift Container Storage operator on CLI as shown in below.

    > oc get pod -n openshift-storage

    NAME READY STATUS RESTARTS AGE

csi-cephfsplugin-6xpsk 3/3 Running 0 45h

csi-cephfsplugin-7khm6 3/3 Running 0 17m

csi-cephfsplugin-bb48n 3/3 Running 0 45h

csi-cephfsplugin-cfzx6 3/3 Running 0 15m

csi-cephfsplugin-provisioner-79587c64f9-2dpm6 5/5 Running 0 45h

csi-cephfsplugin-provisioner-79587c64f9-hf46x 5/5 Running 0 45h

csi-cephfsplugin-w6p6v 3/3 Running 0 45h

csi-rbdplugin-2z686 3/3 Running 0 45h

csi-rbdplugin-6tv5m 3/3 Running 0 45h

csi-rbdplugin-jgf5z 3/3 Running 0 17m

csi-rbdplugin-provisioner-5f495c4566-76rqm 5/5 Running 0 45h

csi-rbdplugin-provisioner-5f495c4566-pzvww 5/5 Running 0 45h

csi-rbdplugin-v7lfx 3/3 Running 0 45h

csi-rbdplugin-ztdjs 3/3 Running 0 15m

noobaa-core-0 1/1 Running 0 45h

noobaa-db-0 1/1 Running 0 45h

noobaa-endpoint-6458fc874f-vpznd 1/1 Running 0 45h

noobaa-operator-7f4495fc6-lmk9k 1/1 Running 0 45h

ocs-operator-5d664769f-59v8j 1/1 Running 0 45h

rook-ceph-crashcollector-sworker1.socp.twentynet.local-84dddddb 1/1 Running 0 45h

rook-ceph-crashcollector-sworker2.socp.twentynet.local-8b5qzzsz 1/1 Running 0 45h

rook-ceph-crashcollector-sworker3.socp.twentynet.local-699n9kzp 1/1 Running 0 45h

rook-ceph-drain-canary-sworker1.socp.twentynet.local-85bffzm66m 1/1 Running 0 45h

rook-ceph-drain-canary-sworker2.socp.twentynet.local-66bcfjjfkr 1/1 Running 0 45h

rook-ceph-drain-canary-sworker3.socp.twentynet.local-5f6b57c9nt 1/1 Running 0 45h

rook-ceph-mds-ocs-storagecluster-cephfilesystem-a-67fbb67dkb4kz 1/1 Running 0 45h

rook-ceph-mds-ocs-storagecluster-cephfilesystem-b-db66df7dtqkmx 1/1 Running 0 45h

rook-ceph-mgr-a-6f5f7b58dc-fjvjc 1/1 Running 0 45h

rook-ceph-mon-a-76cc49c944-5pcgf 1/1 Running 0 45h

rook-ceph-mon-b-b9449cdd7-s6mct 1/1 Running 0 45h

rook-ceph-mon-c-59d854cd8-gn6sd 1/1 Running 0 45h

rook-ceph-operator-775cd6cd66-sdfph 1/1 Running 0 45h

rook-ceph-osd-0-7644557bfb-9l7ns 1/1 Running 0 45h

rook-ceph-osd-1-7694c74948-lc9sf 1/1 Running 0 45h

rook-ceph-osd-2-794547558-wjcpz 1/1 Running 0 45h

rook-ceph-osd-prepare-ocs-deviceset-0-0-5jxg7-t89zh 0/1 Completed 0 45h

rook-ceph-osd-prepare-ocs-deviceset-1-0-lhtvh-f2znl 0/1 Completed 0 45h

rook-ceph-osd-prepare-ocs-deviceset-2-0-jmmck-wsrb2 0/1 Completed 0 45h

rook-ceph-rgw-ocs-storagecluster-cephobjectstore-a-67b7865qx276 1/1 Running 0 45h

$

  10. Storage capacity of OCS cluster with 3 worker nodes (3x500Gi) on OCP web cluster as shown below figure.

# Validating OCS with deploying WordPress application

This section covers the steps to validate the OpenShift Container Storage deployment (OCS) by deploying 2-tier application along with MySQL database.

Prerequisites

  • OCP 4.6 cluster must be installed.

  • OCS to claim persistent volume (PV).

# Deploying WordPress application

NOTE

BASE_DIR - is a base directory path for all automated scripts directories are in place and path is /opt/hpe/solutions/ocp/hpe-solutions-openshift/DL/scalable

  1. Login to the installer machine as a non-root user.

  2. From within the repository, navigate to the WordPress script folder

    > cd $BASE_DIR/ocs_installation/wordpress

  3. Run below script to deploy Wordpress application along with MySQL

    > ./deploy_wordpress.sh

The deploy_wordpress.sh scripts does the following activities.

  • Creates project

  • Sets default storage class

  • Deploys Wordpress and MySQL app

  • Create routes

  1. Below is the output of the scripts

    > ./deploy_wordpress.sh

    Output of the command follows:

    Already on project "wordpress" on server "https://api.socp.twentynet.local:6443".

You can add applications to this project with the 'new-app' command.
For example, try:

oc new-app ruby~https://github.com/sclorg/ruby-ex.git

to build a new example application in Ruby. Or use kubectl to deploy a simple Kubernetes application:

kubectl create deployment hello-node --image=gcr.io/hello-minikube-zero-install/hello-node

Already on project "wordpress" on server "https://api.socp.twentynet.local:6443".

clusterrole.rbac.authorization.k8s.io/system:openshift:scc:anyuid
added: "default"error: --overwrite is false but found the following declared annotation(s):
'storageclass.kubernetes.io/is-default-class' already has a value (true)

service/wordpress-http created

service/wordpress-mysql created

persistentvolumeclaim/mysql-pv-claim created

persistentvolumeclaim/wp-pv-claim created

secret/mysql-pass created

deployment.apps/wordpress-mysql created

deployment.apps/wordpress created

route.route.openshift.io/wordpress-http created

URL to access application

wordpress-http-wordpress.apps.socp.twentynet.local

$

# Verifying the WordPress deployment

  1. Execute the following command to verify the persistent volume associated with WordPress application and MySQL database.

    > oc get pods,pvc,route -n wordpress

    NAME                                  READY   STATUS    RESTARTS   AGE
pod/wordpress-6f69797b8f-hqpss        1/1     Running   0          5m52s
pod/wordpress-mysql-8f4b599b5-cd2s2   1/1     Running   0          5m52s

    NAME                                   STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS                  AGE
persistentvolumeclaim/mysql-pv-claim   Bound    pvc-ccf2a578-9ba3-4577-8115-7c80ac200a9c   5Gi        RWO            ocs-storagecluster-ceph-rbd   5m50s
persistentvolumeclaim/wp-pv-claim      Bound    pvc-3acec0a0-943d-4138-bda9-5b57f8c35c5d   5Gi        RWO            ocs-storagecluster-ceph-rbd   5m50s

    NAME                                      HOST/PORT                                              PATH   SERVICES         PORT     TERMINATION   WILDCARD
route.route.openshift.io/wordpress-http   wordpress-http-wordpress.apps.socp.twentynet.local          wordpress-http   80-tcp                 None
$

  2. Access the route url in browser to access the WordPress application as shown below.

# Deploying OpenShift Container Storage with VMware vSphere

OpenShift 4.6 provides software-defined storage that is optimized for container environment. OpenShift Container Storage (OCS) can either be deployed on vSphere or AWS Azure.

For more information on planning your infrastructure requirements for OCS, see (https://access.redhat.com/documentation/en-us/red_hat_openshift_container_storage/4.5/pdf/planning_your_deployment/Red_Hat_OpenShift_Container_Storage-4.5-Planning_your_deployment-en-US.pdf)

Use the Red Hat®OpenShift®Container Platform operator hub to install OCS on vSphere Platform. For more information on how to install OCS on vSphere using Red Hat OpenShift Container Platform, see (https://access.redhat.com/documentation/en-us/red_hat_openshift_container_storage/4.5/html/deploying_openshift_container_storage/index (opens new window)) # CSI Driver Prior to Container Storage Integration (CSI), Kubernetes provided in-tree plugins to support volume. This posed a problem as storage vendors had to align to the Kubernetes release process to fix a bug or to release new features. This also means every storage vendor had their own process to present volume to Kubernetes.

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