This example will copy application data from a web page into a Kubernetes cluster.
This demo requires server running with httpd and php installed. A global load balancer is suggested but not required to ensure that 0 downtime occurs when switching the traffic from the server to the route within the Kubernetes environment. This can be worked around by modifying DNS changing the record of the server URL to the OpenShift environment.
On the server copy the contents of the php-webpage directory into the directory in which httpd is serving pages.
cp -rp php-webpage/ /var/www/html
You should now be able to browse to the page and see the uploader application.
Now create the Kubernetes objects.
NOTE: Before starting modify kubernetes/route.yaml to an address that relates to your environment.
oc new-project uploader
oc create -f kubernetes/
The replicationdestination will create the Loadbalancer service which is used by the external-rsync-source binary.
Using the commands below record the Loadbalancer address and copy the SSH key to the server.
oc get replicationdestination uploader-destination -n uploader --template={{.status.rsync.address}}
ac9ac96b981383304b519defbd5ad89d750-a4fc2845d395b0d4.elb.us-east-1.amazonaws.com
oc get secret -n uploader scribe-rsync-dest-src-uploader-destination --template {{.data.source}} | base64 -d > ~/replication-key
chmod 0600 ~/replication-key
Now that the Loadbalancer address is known and the SSH key is on the server. We will perform a sync. Using the binary https://github.com/backube/scribe/blob/master/bin/external-rsync-source perform the following.
external-rsync-source -i replication-key -d ac9ac96b981383304b519defbd5ad89d750-a4fc2845d395b0d4.elb.us-east-1.amazonaws.com -s /var/www/html/uploader/
The data should now be in the PVC on the Kubernetes cluster. This can be verified by browsing to the site within the Kubernetes cluster and stopping the server.