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simplifying instructions, removing redundant sections, fixing arun-gupta#59 
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‎chapters/docker-kubernetes.adoc‎

Lines changed: 103 additions & 118 deletions
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@@ -116,17 +116,18 @@ NAME LABELS STATUS
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[source, text]
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----
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> ./cluster/kubectl.sh get nodes
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NAME LABELS STATUS
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10.245.1.3 kubernetes.io/hostname=10.245.1.3 Ready
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kubernetes> ./cluster/kubectl.sh get po
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POD IP CONTAINER(S) IMAGE(S) HOST LABELS STATUS CREATED MESSAGE
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kube-dns-v1-jnvez 172.17.0.2 10.245.1.3/10.245.1.3 k8s-app=kube-dns,kubernetes.io/cluster-service=true,version=v1 Running 6 minutes
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skydns gcr.io/google_containers/skydns:2015-03-11-001 Running 4 minutes last termination: exit code 2
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kube2sky gcr.io/google_containers/kube2sky:1.7 Running 4 minutes
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etcd gcr.io/google_containers/etcd:2.0.9 Running 5 minutes
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kube-scheduler-kubernetes-master kubernetes-master/ <none> Pending 2 seconds
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kube-scheduler gcr.io/google_containers/kube-scheduler:d1f640dfb379f64daf3ae44286014821
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POD IP CONTAINER(S) IMAGE(S) HOST LABELS STATUS CREATED MESSAGE
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etcd-server-kubernetes-master kubernetes-master/ <none> Running 2 minutes
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etcd-container gcr.io/google_containers/etcd:2.0.9 Running 2 minutes
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kube-apiserver-kubernetes-master kubernetes-master/ <none> Running 2 minutes
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kube-apiserver gcr.io/google_containers/kube-apiserver:465b93ab80b30057f9c2ef12f30450c3 Running 2 minutes
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kube-dns-v1-lxdof 10.245.1.3/ k8s-app=kube-dns,kubernetes.io/cluster-service=true,version=v1 Pending 2 minutes
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etcd gcr.io/google_containers/etcd:2.0.9
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kube2sky gcr.io/google_containers/kube2sky:1.7
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skydns gcr.io/google_containers/skydns:2015-03-11-001
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kube-scheduler-kubernetes-master kubernetes-master/ <none> Running 2 minutes
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kube-scheduler gcr.io/google_containers/kube-scheduler:d1f640dfb379f64daf3ae44286014821 Running 2 minutes
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----
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. Check the list of services running:
@@ -174,35 +175,54 @@ Any Service that a Pod wants to access must be created before the Pod itself, or
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./cluster/kubectl.sh create -f ../../attendees/kubernetes/mysql-service.yaml
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----
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It uses the following configuration file:
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+
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[source, yaml]
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----
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id: mysql
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kind: Service
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apiVersion: v1beta3
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metadata:
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name: mysql
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labels:
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name: mysql
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context: docker-k8s-lab
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spec:
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ports:
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- port: 3306
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selector:
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name: mysql
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labels:
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name: mysql
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----
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+
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. Check that the service is created:
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[source, text]
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----
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> ./cluster/kubectl.sh get se
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NAME LABELS SELECTOR IP(S) PORT(S)
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kube-dns k8s-app=kube-dns,kubernetes.io/cluster-service=true,kubernetes.io/name=KubeDNS k8s-app=kube-dns 10.247.0.10 53/UDP
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53/TCP
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kubernetes component=apiserver,provider=kubernetes <none> 10.247.0.2 443/TCP
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kubernetes-ro component=apiserver,provider=kubernetes <none> 10.247.0.1 80/TCP
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mysql name=mysql name=mysql 10.247.82.83 3306/TCP
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> ./cluster/kubectl.sh get se -l context=docker-k8s-lab
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NAME LABELS SELECTOR IP(S) PORT(S)
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mysql context=docker-k8s-lab,name=mysql name=mysql 10.247.141.208 3306/TCP
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----
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. When a Pod is run on a node, the kubelet adds a set of environment variables for each active Service.
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Note that the label used during the creation is used to query the service.
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+
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When a Pod is run on a node, the kubelet adds a set of environment variables for each active Service.
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It supports both Docker links compatible variables and simpler `{SVCNAME}_SERVICE_HOST` and `{SVCNAME}_SERVICE_PORT` variables, where the Service name is upper-cased and dashes are converted to underscores.
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Our service name is ``mysql'' and so `MYSQL_SERVICE_HOST` and `MYSQL_SERVICE_PORT` variables are available to other pods.
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TODO: Consider adding DNS support as explained at: https://github.com/GoogleCloudPlatform/kubernetes/blob/master/docs/services.md#dns
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Send a Pull Request for https://github.com/javaee-samples/docker-java/issues/62[#62].
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#### Start MySQL Replication Controller
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. Start MySQL replication controller as:
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[source, text]
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----
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> ./cluster/kubectl.sh create --v=5 -f ../../attendees/kubernetes/mysql.yaml
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I0616 13:46:49.767091 4376 defaults.go:174] creating security context for container mysql
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> ./cluster/kubectl.sh --v=5 create -f ../../attendees/kubernetes/mysql.yaml
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I0616 19:41:55.441461 8346 defaults.go:174] creating security context for container mysql
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replicationcontrollers/mysql
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----
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@@ -213,17 +233,19 @@ It uses the following configuration file:
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kind: ReplicationController
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apiVersion: v1beta3
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metadata:
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name: mysql-server
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name: mysql
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labels:
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name: mysql-server
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name: mysql
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context: docker-k8s-lab
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spec:
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replicas: 1
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selector:
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name: mysql-server
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name: mysql
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template:
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metadata:
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labels:
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name: mysql-server
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name: mysql
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context: docker-k8s-lab
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spec:
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containers:
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- name: mysql
@@ -238,19 +260,29 @@ spec:
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- name: MYSQL_ROOT_PASSWORD
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value: supersecret
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ports:
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- containerPort: 3360
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- containerPort: 3306
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hostPort: 3306
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----
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Once again, the ``docker-k8s-lab'' label is used. This simplifies querying the created pods later on.
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. Verify MySQL replication controller as:
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[source, text]
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----
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> ./cluster/kubectl.sh get rc
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CONTROLLER CONTAINER(S) IMAGE(S) SELECTOR REPLICAS
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kube-dns-v1 etcd gcr.io/google_containers/etcd:2.0.9 k8s-app=kube-dns,version=v1 1
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kube2sky gcr.io/google_containers/kube2sky:1.7
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skydns gcr.io/google_containers/skydns:2015-03-11-001
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mysql-server mysql mysql:latest name=mysql-server 1
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> ./cluster/kubectl.sh get rc -l context=docker-k8s-lab
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CONTROLLER CONTAINER(S) IMAGE(S) SELECTOR REPLICAS
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mysql mysql mysql:latest name=mysql 1
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----
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. Check the status of MySQL pod as:
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+
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[source, text]
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----
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> ./cluster/kubectl.sh get po -l context=docker-k8s-lab
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POD IP CONTAINER(S) IMAGE(S) HOST LABELS STATUS CREATED MESSAGE
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mysql-7lq67 10.245.1.3/ context=docker-k8s-lab,name=mysql Pending About a minute
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mysql mysql:latest
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#### Start WildFly Replication Controller
@@ -259,8 +291,8 @@ mysql-server mysql mysql:latest n
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[source, text]
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----
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> ./cluster/kubectl.sh --v=5 create -f ../../attendees/kubernetes/wildfly.yaml
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I0605 16:25:41.990260 66897 defaults.go:174] creating security context for container wildfly
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> ./cluster/kubectl.sh --v=5 create -f ../../attendees/kubernetes/wildfly.yaml
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I0616 18:59:00.563099 7849 defaults.go:174] creating security context for container wildfly
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replicationcontrollers/wildfly
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@@ -274,6 +306,7 @@ metadata:
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name: wildfly
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labels:
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name: wildfly
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context: docker-k8s-lab
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spec:
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replicas: 1
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selector:
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metadata:
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labels:
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name: wildfly-server
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context: docker-k8s-lab
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spec:
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containers:
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- name: wildfly
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image: arungupta/wildfly-mysql-javaee7:k8s
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ports:
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- containerPort: 8080
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hostPort: 8080
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----
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. Verify WildFly replication controller as:
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. Verify WildFly replication controller using ``docker-k8s-lab'' label as:
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[source, text]
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----
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> ./cluster/kubectl.sh get rc
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CONTROLLER CONTAINER(S) IMAGE(S) SELECTOR REPLICAS
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kube-dns-v1 etcd gcr.io/google_containers/etcd:2.0.9 k8s-app=kube-dns,version=v1 1
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kube2sky gcr.io/google_containers/kube2sky:1.7
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skydns gcr.io/google_containers/skydns:2015-03-11-001
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mysql-server mysql mysql:latest name=mysql-server 1
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wildfly wildfly arungupta/wildfly-mysql-javaee7:knetes name=wildfly-server 1
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> ./cluster/kubectl.sh get rc -l context=docker-k8s-lab
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CONTROLLER CONTAINER(S) IMAGE(S) SELECTOR REPLICAS
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mysql mysql mysql:latest name=mysql 1
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wildfly wildfly arungupta/wildfly-mysql-javaee7:k8s name=wildfly-server 1
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----
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+
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. Check the status of WildFly pod as:
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+
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[source, text]
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----
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> ./cluster/kubectl.sh get pod -l context=docker-k8s-lab
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POD IP CONTAINER(S) IMAGE(S) HOST LABELS STATUS CREATED MESSAGE
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mysql-7lq67 10.245.1.3/ context=docker-k8s-lab,name=mysql Pending 3 minutes
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mysql mysql:latest
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wildfly-o0nw6 10.245.1.3/ context=docker-k8s-lab,name=wildfly-server Pending 45 seconds
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wildfly arungupta/wildfly-mysql-javaee7:k8s
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----
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Make sure the status of both WildFly and MySQL pod is changed to ``running''. It will look like:
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[source, text]
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----
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> ./cluster/kubectl.sh get pod -l context=docker-k8s-lab
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POD IP CONTAINER(S) IMAGE(S) HOST LABELS STATUS CREATED MESSAGE
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mysql-7lq67 172.17.0.9 10.245.1.3/10.245.1.3 context=docker-k8s-lab,name=mysql Running 14 minutes
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mysql mysql:latest Running 10 minutes
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wildfly-o0nw6 172.17.0.10 10.245.1.3/10.245.1.3 context=docker-k8s-lab,name=wildfly-server Running 11 minutes
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wildfly arungupta/wildfly-mysql-javaee7:k8s Running 26 seconds
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NOTE: Takes a while for all the pods to start. It took ~25 minutes on a 16 GB, i7 Mac OS X.
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### Access Java EE Application
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http://<pod_ip>:8080/employees/resources/employees
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### Application Logs
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. Login to the Minion-1 VM:
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. Login to Minion-1 VM:
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[source, text]
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----
@@ -357,41 +415,13 @@ docker logs <CID>
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### Delete Kubernetes Resources
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. Delete WildFly repliation controller as:
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[source, text]
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----
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> ./cluster/kubectl.sh --v=5 delete -f ../../attendees/kubernetes/wildfly.yaml
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I0605 16:39:09.152694 67149 defaults.go:174] creating security context for container wildfly
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replicationcontrollers/wildfly
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----
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. Delete MySQL replication controller as:
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[source, text]
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----
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> ./cluster/kubectl.sh --v=5 delete -f ../../attendees/kubernetes/mysql.yaml
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I0605 17:54:26.042191 67742 defaults.go:174] creating security context for container mysql
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replicationcontrollers/mysql-server
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----
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. Delete MySQL service as:
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[source, text]
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----
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> ./cluster/kubectl.sh --v=5 delete -f ../../attendees/kubernetes/mysql-service.yaml
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services/mysql
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----
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Alternatively, all services and replication controllers can be assigned a label and deleted as:
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Individual resources (service, replication controller, or pod) can be deleted by using `delete` command instead of `create` command. Alternatively, all services and replication controllers can be deleted using a label as:
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[source, text]
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kubectl delete -l services,pods name=docker-lab
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kubectl delete -l se,po context=docker-k8s-lab
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Send a PR for the last code: https://github.com/javaee-samples/docker-java/issues/59
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### Stop Kubernetes Cluster
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[source, text]
@@ -447,50 +477,5 @@ b1809bdabd9c gcr.io/google_containers/pause:0.8.0
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. Log out of master.
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#### Kubernetes Minion
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. Check the minions:
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[source, text]
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----
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kubernetes> ./cluster/kubectl.sh get minions
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----
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This is not giving the expected output and filed as https://github.com/GoogleCloudPlatform/kubernetes/issues/9271.
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. Docker and Kubelet are running in minion and can be verified by logging in.
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Log in to the minion as:
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[source, text]
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----
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cluster> vagrant ssh minion-1
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Last login: Thu Jun 4 19:30:03 2015 from 10.0.2.2
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[vagrant@kubernetes-minion-1 ~]$
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----
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. Check the status of Docker:
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[source, text]
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----
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[vagrant@kubernetes-minion-1 ~]$ sudo systemctl status docker
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docker.service - Docker Application Container Engine
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Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled)
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Active: active (running) since Thu 2015-06-04 19:29:44 UTC; 1h 24min ago
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Docs: http://docs.docker.com
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Main PID: 2651 (docker)
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CGroup: /system.slice/docker.service
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└─2651 /usr/bin/docker -d --selinux-enabled
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Jun 04 20:53:41 kubernetes-minion-1 docker[2651]: time="2015-06-04T20:53:41Z" level="info" msg="-job containers() = OK (0)"
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Jun 04 20:53:41 kubernetes-minion-1 docker[2651]: time="2015-06-04T20:53:41Z" level="info" msg="GET /containers/json"
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Jun 04 20:53:41 kubernetes-minion-1 docker[2651]: time="2015-06-04T20:53:41Z" level="info" msg="+job containers()"
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Jun 04 20:53:41 kubernetes-minion-1 docker[2651]: time="2015-06-04T20:53:41Z" level="info" msg="-job containers() = OK (0)"
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Jun 04 20:53:42 kubernetes-minion-1 docker[2651]: time="2015-06-04T20:53:42Z" level="info" msg="GET /containers/json"
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Jun 04 20:53:42 kubernetes-minion-1 docker[2651]: time="2015-06-04T20:53:42Z" level="info" msg="+job containers()"
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Jun 04 20:53:42 kubernetes-minion-1 docker[2651]: time="2015-06-04T20:53:42Z" level="info" msg="-job containers() = OK (0)"
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Jun 04 20:53:46 kubernetes-minion-1 docker[2651]: time="2015-06-04T20:53:46Z" level="info" msg="GET /version"
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Jun 04 20:53:46 kubernetes-minion-1 docker[2651]: time="2015-06-04T20:53:46Z" level="info" msg="+job version()"
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Jun 04 20:53:46 kubernetes-minion-1 docker[2651]: time="2015-06-04T20:53:46Z" level="info" msg="-job version() = OK (0)"
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----
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