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Configure-Persistent-Storage-for-Openshift--Internal-Registry.txt
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Configure-Persistent-Storage-for-Openshift--Internal-Registry.txt
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Configuring the OpenShift Internal Registry for Persistence
############################################################
1. Get the Project List and set default project 'default'
[root@master ~]# oc get projects
[root@master ~]# oc project default
2. Get the list of Pods
[root@master ~]# oc get pods
NAME READY STATUS RESTARTS AGE
docker-registry-1-6gr55 1/1 Running 1 4d
registry-console-1-jllcb 1/1 Running 1 4d
router-1-kgkcg 1/1 Running 1 4d
3. verify the registry Pod have persistent volume or not
[root@master ~]# oc describe pod docker-registry-1-6gr55 | grep -A 2 'Volumes'
Volumes:
registry-storage:
Type: EmptyDir (a temporary directory that shares a pod's lifetime)
[root@master ~]# oc set volume pod docker-registry-1-6gr55
pods/docker-registry-1-6gr55
empty directory as registry-storage ## see here, it's an empty directory as registry storage ##
mounted at /registry
secret/registry-certificates as registry-certificates
mounted at /etc/secrets
secret/registry-token-8hjkp as registry-token-8hjkp
mounted at /var/run/secrets/kubernetes.io/serviceaccount
4. Configure NFS Server to share persistent Storage for registry Pod
[root@nfs ~]# yum install nfs-utils -y
[root@nfs ~]# mkdir -p /shares/registry
[root@nfs ~]# chmod o+rwx /shares/registry/
[root@nfs ~]# echo "/shares/registry 192.168.0.0/24(rw,sync)" >> /etc/exports
[root@nfs ~]# cat /etc/exports
/shares/registry 192.168.0.0/24(rw,sync)
[root@nfs ~]# systemctl start nfs-server
[root@nfs ~]# systemctl enable nfs-server
[root@nfs ~]# showmount -e
Export list for nfs.openshift.example.com:
/shares/registry 192.168.0.0/24
5. Now go to OpenShift Master node and Get NFS Share and Deployment Config details
[root@master ~]# showmount -e nfs.openshift.example.com
Export list for nfs.openshift.example.com:
/shares/registry 192.168.0.0/24
[root@master ~]# oc get dc
NAME REVISION DESIRED CURRENT TRIGGERED BY
docker-registry 1 1 1 config
registry-console 1 1 1 config
router 1 1 1 config
6. Create a YAML file to configure persistent volume
[root@master ~]# vim registry-volume.yaml
apiVersion: v1
kind: PersistentVolume
metadata:
name: registry-volume
spec:
capacity:
storage: 5Gi
accessModes:
- ReadWriteMany
nfs:
path: /shares/registry
server: nfs.openshift.example.com
persistentVolumeReclaimPolicy: Recycle
claimRef:
name: registry-pvclaim
namespace: default
:wq (save and exit)
[root@master ~]# oc create -f registry-volume.yaml
persistentvolume "registry-volume" created
[root@master ~]# oc get pv
NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE
registry-volume 5Gi RWX Recycle Available default/registry-pvclaim 10s
7. Claim the persistent volume for registry Pod
[root@master ~]# oc get pods
NAME READY STATUS RESTARTS AGE
docker-registry-1-2rlzj 1/1 Running 0 28m
registry-console-1-nlrf8 1/1 Running 0 28m
router-1-f8m7j 1/1 Running 0 28m
[root@master ~]# oc get dc
NAME REVISION DESIRED CURRENT TRIGGERED BY
docker-registry 1 1 1 config
registry-console 1 1 1 config
router 1 1 1 config
[root@master ~]# oc set volume dc/docker-registry -n default --add --overwrite --name=registry-storage -t pvc --claim-name=registry-pvclaim --claim-size=5Gi --claim-mode='ReadWritemany'
persistentvolumeclaims/registry-pvclaim
deploymentconfig "docker-registry" updated
[root@master ~]# oc get pvc
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
registry-pvclaim Bound registry-volume 5Gi RWX 29s
[root@master ~]# oc get pv
NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE
registry-volume 5Gi RWX Recycle Bound default/registry-pvclaim 2m
[root@master ~]# oc get pods
NAME READY STATUS RESTARTS AGE
docker-registry-2-cw6s9 1/1 Running 0 1m # Compare docker-registry Pod ID with previous pod list
registry-console-1-nlrf8 1/1 Running 0 31m
router-1-f8m7j 1/1 Running 0 31m
[root@master ~]# oc describe pod docker-registry-2-cw6s9
[root@master ~]# oc set volume pod docker-registry-2-cw6s9
pods/docker-registry-2-cw6s9
secret/registry-certificates as registry-certificates
mounted at /etc/secrets
pvc/registry-pvclaim (allocated 5GiB) as registry-storage
mounted at /registry
secret/registry-token-8hjkp as registry-token-8hjkp
mounted at /var/run/secrets/kubernetes.io/serviceaccount
8. Verify that the registry is using the NFS share to save container images.
Create a new project named registry-storage:
[root@nfs ~]# ls -l /shares/registry/
Now Open Web Browser and point to the following URL to access OpenShift Dashboard:
Login to OpenShift Dashboard : https://master.openshift.example.com:8443/
Username : admin
Password : Pas$$w0rd
Click on "+ Create Project"
Name: registry-storage-project
Display Name registry storage project
Description: registry storage project
Now Select registry storage project -> Brows Catalog -> PHP -> Next ->
Version: 7.0 - latest
Application Name: rgtest
Git Repositories: https://github.com/sureshchandrarhca15/openshift-php-hello-world.git
Create -> Close.
Now click on Overview and expend rgtest App for more details.
You have to wait till build successfully completed. Once completed, you will have a running pod from it.
Now go back to CLI Console on master node, and do the following to verify the pod.
[root@master ~]# oc get pods -n registry-storage-project -o wide
NAME READY STATUS RESTARTS AGE IP NODE
regtest-1-442wk 1/1 Running 0 2m 10.131.0.25 node2.openshift.example.com
regtest-1-build 0/1 Completed 0 4m 10.131.0.24 node2.openshift.example.com
Now go back to NFS Server and check the share for registry Images
[root@localhost ~]# ls -l /shares/registry/
total 0
drwxr-xr-x 3 1000000000 nfsnobody 22 Oct 21 14:14 docker
[root@localhost ~]# ls -l /shares/registry/docker/registry/v2/repositories/
total 0
drwxr-xr-x 3 1000000000 nfsnobody 21 Oct 21 14:14 registry-storage-project
You have successfuly configured Openshift Docker Registry with Persistent Storage using NFS Share.