Hi!
I am new to Kubernetes, and try to learn hands-on by setting up a Wordpress
with this tutorial:
https://github.com/kubernetes/kubernetes/tree/master/examples/mysql-wordpress-pd
My Kubernetes cluster runs on Amazon EC2, set up via kops. I ended up with a
little cluster (1 master, 2 nodes). Then I started with the tutorial, but I use
Amazon EBS volumes for persistent storage.
In the first attempt, I created the EBS volumes manually, and then wondered why
Kubernetes created new ones, until I learned about StorageClasses and Dynamic
Perstistent Volumes. Indeed I seem to have a default StorageClass using aws-ebs
(surely set up by kops).
The tutorial consists of two pods: One for a MySQL database, and one for
Wordpress. The first pod (MySQL) starts fine.
But the second (Wordpress) pod ends up in the state "CrashLoopBackOff". Using
"kubectl describe", I found this:
Events:
FirstSeen LastSeen Count From SubObjectPath
Type Reason Message
--------- -------- ----- ---- -------------
-------- ------ -------
10s 10s 2 default-scheduler
Warning FailedScheduling [SchedulerPredicates failed due to
PersistentVolumeClaim is not bound: "wp-pv-claim", which is unexpected.,
SchedulerPredicates failed due to PersistentVolumeClaim is not bound:
"wp-pv-claim", which is unexpected., SchedulerPredicates failed due to
PersistentVolumeClaim is not bound: "wp-pv-claim", which is unexpected.]
9s 9s 1 default-scheduler
Normal Scheduled Successfully assigned
wordpress-4130225953-hgn4h to ip-172-20-58-86.eu-west-1.compute.internal
9s 8s 2 controller-manager
Warning FailedMount Failed to attach volume
"pvc-b859ae60-358c-11e7-b405-02bae99411f4" on node
"ip-172-20-58-86.eu-west-1.compute.internal" with: Error attaching EBS volume
"vol-07bb1f4adb5fb9a96" to instance "i-0d12a00064527321a": IncorrectState:
vol-07bb1f4adb5fb9a96 is not 'available'.
status code: 400, request id:
Apparently, it fails to mount the automatically provisioned volume to the node.
But I checked the node via the AWS Console, and the volume is already attached.
Any ideas what went wrong?
Thanks
Martin
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