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How to use Kubernetes Persistent Volume bound to Amazon EBS with Couchbase

Create a Volume on EBS

Create a 5GB SSD volume on EBS: aws ec2 create-volume --region us-west-2 --availability-zone us-west-2a --size 5 --volume-type gp2. Make sure the availability zone where the Kubernetes cluster and volume is created matches.

Output is:

{
    "AvailabilityZone": "us-west-2a",
    "Encrypted": false,
    "VolumeType": "gp2",
    "VolumeId": "vol-47f59cce",
    "State": "creating",
    "Iops": 100,
    "SnapshotId": "",
    "CreateTime": "2016-07-29T21:57:43.343Z",
    "Size": 5
}

Check if the volume is available: aws --region us-west-2 ec2 describe-volumes --volume-id vol-47f59cce.

Output is:

{
    "Volumes": [
        {
            "AvailabilityZone": "us-west-2a",
            "Attachments": [],
            "Encrypted": false,
            "VolumeType": "gp2",
            "VolumeId": "vol-47f59cce",
            "State": "available",
            "Iops": 100,
            "SnapshotId": "",
            "CreateTime": "2016-07-29T21:57:43.343Z",
            "Size": 5
        }
    ]
}

Note the unique identifier for the volume in VolumeId attribute.

Start Kubernetes Cluster

export KUBERNETES_PROVIDER=aws
KUBE_AWS_ZONE=us-west-2a NODE_SIZE=m3.large NUM_NODES=3 ./kubernetes/cluster/kube-up.sh

Log output:

... Starting cluster in us-west-2a using provider aws
... calling verify-prereqs
... calling kube-up
Starting cluster using os distro: jessie
Uploading to Amazon S3
+++ Staging server tars to S3 Storage: kubernetes-staging-0eaf81fbc51209dd47c13b6d8b424149/devel
upload: ../../../../../var/folders/81/ttv4n16x7p390cttrm_675y00000gn/T/kubernetes.XXXXXX.ISohbaGM/s3/bootstrap-script to s3://kubernetes-staging-0eaf81fbc51209dd47c13b6d8b424149/devel/bootstrap-script
Uploaded server tars:
  SERVER_BINARY_TAR_URL: https://s3.amazonaws.com/kubernetes-staging-0eaf81fbc51209dd47c13b6d8b424149/devel/kubernetes-server-linux-amd64.tar.gz
  SALT_TAR_URL: https://s3.amazonaws.com/kubernetes-staging-0eaf81fbc51209dd47c13b6d8b424149/devel/kubernetes-salt.tar.gz
  BOOTSTRAP_SCRIPT_URL: https://s3.amazonaws.com/kubernetes-staging-0eaf81fbc51209dd47c13b6d8b424149/devel/bootstrap-script
INSTANCEPROFILE	arn:aws:iam::598307997273:instance-profile/kubernetes-master	2016-07-29T15:13:35Z	AIPAJF3XKLNKOXOTQOCTkubernetes-master	/
ROLES	arn:aws:iam::598307997273:role/kubernetes-master	2016-07-29T15:13:33Z	/	AROAI3Q2KFBD5PCKRXCRM	kubernetes-master
ASSUMEROLEPOLICYDOCUMENT	2012-10-17
STATEMENT	sts:AssumeRole	Allow
PRINCIPAL	ec2.amazonaws.com
INSTANCEPROFILE	arn:aws:iam::598307997273:instance-profile/kubernetes-minion	2016-07-29T15:13:39Z	AIPAIYSH5DJA4UPQIP4Bkubernetes-minion	/
ROLES	arn:aws:iam::598307997273:role/kubernetes-minion	2016-07-29T15:13:37Z	/	AROAIQ57MPQYSHRPQCT2Q	kubernetes-minion
ASSUMEROLEPOLICYDOCUMENT	2012-10-17
STATEMENT	sts:AssumeRole	Allow
PRINCIPAL	ec2.amazonaws.com
Using SSH key with (AWS) fingerprint: SHA256:dX/5wpWuUxYar2NFuGwiZuRiydiZCyx4DGoZ5/jL/j8
Creating vpc.
Adding tag to vpc-fa3d6c9e: Name=kubernetes-vpc
Adding tag to vpc-fa3d6c9e: KubernetesCluster=kubernetes
Using VPC vpc-fa3d6c9e
Adding tag to dopt-3aad625e: Name=kubernetes-dhcp-option-set
Adding tag to dopt-3aad625e: KubernetesCluster=kubernetes
Using DHCP option set dopt-3aad625e
Creating subnet.
Adding tag to subnet-e11f5985: KubernetesCluster=kubernetes
Using subnet subnet-e11f5985
Creating Internet Gateway.
Using Internet Gateway igw-5c748f38
Associating route table.
Creating route table
Adding tag to rtb-84fcf1e0: KubernetesCluster=kubernetes
Associating route table rtb-84fcf1e0 to subnet subnet-e11f5985
Adding route to route table rtb-84fcf1e0
Using Route Table rtb-84fcf1e0
Creating master security group.
Creating security group kubernetes-master-kubernetes.
Adding tag to sg-91590bf7: KubernetesCluster=kubernetes
Creating minion security group.
Creating security group kubernetes-minion-kubernetes.
Adding tag to sg-9d590bfb: KubernetesCluster=kubernetes
Using master security group: kubernetes-master-kubernetes sg-91590bf7
Using minion security group: kubernetes-minion-kubernetes sg-9d590bfb
Creating master disk: size 20GB, type gp2
Adding tag to vol-def79e57: Name=kubernetes-master-pd
Adding tag to vol-def79e57: KubernetesCluster=kubernetes
Allocated Elastic IP for master: 52.40.216.69
Adding tag to vol-def79e57: kubernetes.io/master-ip=52.40.216.69
Generating certs for alternate-names: IP:52.40.216.69,IP:172.20.0.9,IP:10.0.0.1,DNS:kubernetes,DNS:kubernetes.default,DNS:kubernetes.default.svc,DNS:kubernetes.default.svc.cluster.local,DNS:kubernetes-master
Starting Master
Adding tag to i-5a7cebf5: Name=kubernetes-master
Adding tag to i-5a7cebf5: Role=kubernetes-master
Adding tag to i-5a7cebf5: KubernetesCluster=kubernetes
Waiting for master to be ready
Attempt 1 to check for master nodeWaiting for instance i-5a7cebf5 to be running (currently pending)
Sleeping for 3 seconds...
Waiting for instance i-5a7cebf5 to be running (currently pending)
Sleeping for 3 seconds...
Waiting for instance i-5a7cebf5 to be running (currently pending)
Sleeping for 3 seconds...
Waiting for instance i-5a7cebf5 to be running (currently pending)
Sleeping for 3 seconds...
 [master running]
Attaching IP 52.40.216.69 to instance i-5a7cebf5
Attaching persistent data volume (vol-def79e57) to master
2016-07-29T22:00:36.909Z	/dev/sdb	i-5a7cebf5	attaching	vol-def79e57
cluster "aws_kubernetes" set.
user "aws_kubernetes" set.
context "aws_kubernetes" set.
switched to context "aws_kubernetes".
user "aws_kubernetes-basic-auth" set.
Wrote config for aws_kubernetes to /Users/arungupta/.kube/config
Creating minion configuration
Creating autoscaling group
 0 minions started; waiting
 0 minions started; waiting
 0 minions started; waiting
 0 minions started; waiting
 3 minions started; ready
Waiting for cluster initialization.

  This will continually check to see if the API for kubernetes is reachable.
  This might loop forever if there was some uncaught error during start
  up.

..........................................................................................................................................................................................................Kubernetes cluster created.
Sanity checking cluster...
Attempt 1 to check Docker on node @ 52.42.0.65 ...not working yet
Attempt 2 to check Docker on node @ 52.42.0.65 ...not working yet
Attempt 3 to check Docker on node @ 52.42.0.65 ...working
Attempt 1 to check Docker on node @ 52.36.195.201 ...working
Attempt 1 to check Docker on node @ 52.43.35.173 ...working

Kubernetes cluster is running.  The master is running at:

  https://52.40.216.69

The user name and password to use is located in /Users/arungupta/.kube/config.

... calling validate-cluster
Found 3 node(s).
NAME                                        STATUS    AGE
ip-172-20-0-26.us-west-2.compute.internal   Ready     1m
ip-172-20-0-27.us-west-2.compute.internal   Ready     1m
ip-172-20-0-28.us-west-2.compute.internal   Ready     1m
Validate output:
NAME                 STATUS    MESSAGE              ERROR
controller-manager   Healthy   ok
scheduler            Healthy   ok
etcd-0               Healthy   {"health": "true"}
etcd-1               Healthy   {"health": "true"}
Cluster validation succeeded
Done, listing cluster services:

Kubernetes master is running at https://52.40.216.69
Elasticsearch is running at https://52.40.216.69/api/v1/proxy/namespaces/kube-system/services/elasticsearch-logging
Heapster is running at https://52.40.216.69/api/v1/proxy/namespaces/kube-system/services/heapster
Kibana is running at https://52.40.216.69/api/v1/proxy/namespaces/kube-system/services/kibana-logging
KubeDNS is running at https://52.40.216.69/api/v1/proxy/namespaces/kube-system/services/kube-dns
kubernetes-dashboard is running at https://52.40.216.69/api/v1/proxy/namespaces/kube-system/services/kubernetes-dashboard
Grafana is running at https://52.40.216.69/api/v1/proxy/namespaces/kube-system/services/monitoring-grafana
InfluxDB is running at https://52.40.216.69/api/v1/proxy/namespaces/kube-system/services/monitoring-influxdb

To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.

Create Kubernetes Artifacts

Create a Kubernetes Persistent Volume

Create a Persistent Volume as kubectl create -f couchbase-pv.yml. Make sure to specify the volume id from the previous step in couchbase-pv.yml.

kind: PersistentVolume
apiVersion: v1
metadata:
  name: couchbase-pv
  labels:
    type: amazonEBS
spec:
  capacity:
    storage: 5Gi
  accessModes:
    - ReadWriteOnce
  awsElasticBlockStore:
    volumeID: vol-47f59cce
    fsType: ext4

Output is:

persistentvolume "couchbase-pv" created

Create Persistent Volume Claim

Create a Persistent Volume Claim as kubectl create -f couchbase-pvc.yml

kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: couchbase-pvc
  labels:
    type: amazonEBS
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 5Gi

Output is:

persistentvolumeclaim "couchbase-pvc" created

Create a Kubernetes Replication Controller

Create a RC using arungupta/couchbase image and claiming the PVC as kubectl create -f couchbase-rc.yml:

apiVersion: v1
kind: ReplicationController
metadata:
  name: couchbase
spec:
  replicas: 1
  template:
    metadata:
      name: couchbase-rc-pod
      labels:
        name: couchbase-rc-pod
        context: couchbase-pv
    spec:
      containers:
      - name: couchbase-rc-pod
        image: arungupta/couchbase
        volumeMounts:
        - mountPath: "/opt/couchbase/var"
          name: mypd
        ports:
        - containerPort: 8091
        - containerPort: 8092
        - containerPort: 8093
        - containerPort: 11210
      volumes:
      - name: mypd
        persistentVolumeClaim:
          claimName: couchbase-pvc

Output is:

replicationcontroller "couchbase-rc" created

Check for Pod:

~/tools/kubernetes/kubernetes-1.3.3/kubernetes/cluster/kubectl.sh get -w po
NAME              READY     STATUS              RESTARTS   AGE
couchbase-jx3fn   0/1       ContainerCreating   0          3s
NAME              READY     STATUS    RESTARTS   AGE
couchbase-jx3fn   1/1       Running   0          20s

Expose Pod on Kubernetes as Service

~/tools/kubernetes/kubernetes-1.3.3/kubernetes/cluster/kubectl.sh expose rc couchbase --target-port=8091 --port=8091 --type=LoadBalancer

Output is:

service "couchbase" exposed

Describe the service:

~/tools/kubernetes/kubernetes-1.3.3/kubernetes/cluster/kubectl.sh describe svc couchbase

Output is:

Name:			couchbase
Namespace:		default
Labels:			context=couchbase-pv
			name=couchbase-pod
Selector:		context=couchbase-pv,name=couchbase-pod
Type:			LoadBalancer
IP:			10.0.49.129
LoadBalancer Ingress:	a6179426155e211e6b664022b850255f-1850736155.us-west-2.elb.amazonaws.com
Port:			<unset>	8091/TCP
NodePort:		<unset>	31636/TCP
Endpoints:		10.244.1.3:8091
Session Affinity:	None
Events:
  FirstSeen	LastSeen	Count	From			SubobjectPath	Type		Reason			Message
  ---------	--------	-----	----			-------------	--------	------			-------
  31s		31s		1	{service-controller }			Normal		CreatingLoadBalancer	Creating load balancer
  29s		29s		1	{service-controller }			Normal		CreatedLoadBalancer	Created load balancer

Wait for 3 minutes for Load Balancer to settle.

Show stateful container

  1. Open up Couchbase Web Console at <ingress-ip>:8091, go to Data Buckets tab and create a new data bucket.

  2. Get all pods:

    kubectl.sh get po
NAME              READY     STATUS    RESTARTS   AGE
couchbase-jx3fn   1/1       Running   0          7m

  3. Delete the pod:

    kubectl.sh delete po couchbase-jx3fn
pod "couchbase-jx3fn" deleted

  4. Pod gets recreated:

    kubectl.sh get -w po
NAME              READY     STATUS              RESTARTS   AGE
couchbase-jx3fn   1/1       Terminating         0          8m
couchbase-qq6wu   0/1       ContainerCreating   0          4s
NAME              READY     STATUS    RESTARTS   AGE
couchbase-qq6wu   1/1       Running   0          5s

  5. Access Couchbase Web Console again to see that the bucket still exists.