Day 1 - Second Half

Workshop 2: Pods, Service, Deployment

Part 1 - Single Container

$ kubectl create -f https://raw.githubusercontent.com/praparn/kubernetes_20180701/master/WorkShop_1.2_Pods_Service_Deployment/singlecontainer/webtest_pod.yml
$ kubectl get pods
$ kubectl create -f https://raw.githubusercontent.com/praparn/kubernetes_20180701/master/WorkShop_1.2_Pods_Service_Deployment/singlecontainer/webtest_svc.yml
$ kubectl get svc
$ $ curl http://192.168.99.100:30467
<H1> Welcome Page from Container Python Lab </H1>Checkpoint Date/Time: Sun Jul  8 05:57:33 2018

$ kubectl describe pods webtest | more
$ kubectl describe svc webtest
$ kubectl logs webtest -c webtest
$ kubectl exec -it webtest -c webtest sh

$ kubectl delete -f https://raw.githubusercontent.com/praparn/kubernetes_20180701/master/WorkShop_1.2_Pods_Service_Deployment/singlecontainer/webtest_pod.yml
$ kubectl delete -f https://raw.githubusercontent.com/praparn/kubernetes_20180701/master/WorkShop_1.2_Pods_Service_Deployment/singlecontainer/webtest_svc.yml

Part 2 - Multiple Containers

Simple Architecture

More Robust Architecture

TLS at nginx web proxy to reduce traffic overhead in the backend
DB cache by In-Memory DB e.g. redis
- Scenario: Cinema's applications
- redis has an automatic expiration

APIs

/init
/insertuser
/removeuser/<uid>
/users/

Main Database

$ kubectl create -f https://raw.githubusercontent.com/praparn/kubernetes_20180701/master/WorkShop_1.2_Pods_Service_Deployment/multicontainer/databasemodule_pod.yml
$ kubectl get pod
NAME                       READY     STATUS    RESTARTS   AGE
maindb                     1/1       Running   0          2m
$ kubectl create -f https://raw.githubusercontent.com/praparn/kubernetes_20180701/master/WorkShop_1.2_Pods_Service_Deployment/multicontainer/databasemodule_svc.yml
$ kubectl get svc
NAME         CLUSTER-IP      EXTERNAL-IP   PORT(S)    AGE
kubernetes   10.96.0.1       <none>        443/TCP    3h
maindb       10.101.162.54   <none>        3306/TCP   6s

Web Service

$ kubectl create -f https://raw.githubusercontent.com/praparn/kubernetes_20180701/master/WorkShop_1.2_Pods_Service_Deployment/multicontainer/webmodule_pod.yml
$ kubectl get pod
NAME                       READY     STATUS    RESTARTS   AGE
maindb                     1/1       Running   0          2m
web                        3/3       Running   0          50s
$ kubectl create -f https://raw.githubusercontent.com/praparn/kubernetes_20180701/master/WorkShop_1.2_Pods_Service_Deployment/multicontainer/webmodule_svc.yml
$ kubectl get svc
NAME         CLUSTER-IP       EXTERNAL-IP   PORT(S)                       AGE
kubernetes   10.96.0.1        <none>        443/TCP                       3h
maindb       10.101.162.54    <none>        3306/TCP                      2m
web          10.106.153.242   <nodes>       5000:32500/TCP,80:30500/TCP   12s

Note: web pod has 3 containers

Pod YAML

apiVersion: "v1"
kind: Pod
metadata:
  name: web
  labels:
    name: "web"
    owner: "Praparn_L"
    version: "1.0"
    module: "web"
    environment: "development"
spec:
  containers:
    - name: cachedb
      image: labdocker/redis:latest
      ports:
        - containerPort: 6379
          protocol: TCP
    - name: webservice
      image: labdocker/cluster:webservice
      env:
        - name: "REDIS_HOST"
          value: "localhost"
      ports:
        - containerPort: 5000
          protocol: TCP
    - name: webcache
      image: labdocker/cluster:webcache_kubernetes
      ports:
        - containerPort: 80
          protocol: TCP

Service YAML

apiVersion: v1
kind: Service
metadata:
  name: web
  labels:
    name: "web"
    owner: "Praparn_L"
    version: "1.0"
    module: "Web"
    environment: "development"
spec:
  selector:
    name: "web"
    owner: "Praparn_L"
    version: "1.0"
    module: "web"
    environment: "development"
  type: NodePort
  ports:
   - port: 5000
     name: webservice
     targetPort: 5000
     protocol: TCP
     nodePort: 32500
   - port: 80
     name: webcache
     targetPort: 80
     protocol: TCP
     nodePort: 30500

Test

$ export Server_IP=192.168.99.100
$ export Server_Port=30500
$ curl http://$Server_IP:$Server_Port/init
###########   Database Create New Account Table Done  ###########

$ curl -i -H "Content-Type: application/json" -X POST -d '{"uid": "1", "user":"Praparn Luangphoonlap", "descripe":"Slave"}' http://$Server_IP:$Server_Port/users/insertuser && \
curl -i -H "Content-Type: application/json" -X POST -d '{"uid": "2", "user":"Somchai Sunsukwan", "descripe":"Security Guard"}' http://$Server_IP:$Server_Port/users/insertuser && \
curl -i -H "Content-Type: application/json" -X POST -d '{"uid": "3", "user":"Sanyachan Panrudee", "descripe":"House Keeping"}' http://$Server_IP:$Server_Port/users/insertuser && \
curl -i -H "Content-Type: application/json" -X POST -d '{"uid": "4", "user":"Sakkan Yanyicharoen", "descripe":"Messenger"}' http://$Server_IP:$Server_Port/users/insertuser && \
curl -i -H "Content-Type: application/json" -X POST -d '{"uid": "5", "user":"Chatchai Moungang", "descripe":"Programmer"}' http://$Server_IP:$Server_Port/users/insertuser && \
curl -i -H "Content-Type: application/json" -X POST -d '{"uid": "6", "user":"Anusit Kannaphat", "descripe":"DevOps Manager"}' http://$Server_IP:$Server_Port/users/insertuser && \
curl -i -H "Content-Type: application/json" -X POST -d '{"uid": "7", "user":"Meelarp Maisanuk", "descripe":"System Engineer"}' http://$Server_IP:$Server_Port/users/insertuser && \
curl -i -H "Content-Type: application/json" -X POST -d '{"uid": "8", "user":"Pansa Bunsong", "descripe":"Secuirty Guard"}' http://$Server_IP:$Server_Port/users/insertuser && \
curl -i -H "Content-Type: application/json" -X POST -d '{"uid": "9", "user":"Wiphanee Wongsaisawan", "descripe":"Administrator"}' http://$Server_IP:$Server_Port/users/insertuser

$ curl http://$Server_IP:$Server_Port/users/1
Praparn Luangphoonlap(Database Direct)
$ curl http://$Server_IP:$Server_Port/users/1
Praparn Luangphoonlap(Database Cache)

$ curl http://$Server_IP:$Server_Port/users/4
Sakkan Yanyicharoen(Database Direct)
$ curl http://$Server_IP:$Server_Port/users/4
Sakkan Yanyicharoen(Database Cache)

$ curl http://$Server_IP:$Server_Port/users/removeuser/1 && \
curl http://$Server_IP:$Server_Port/users/removeuser/2 && \
curl http://$Server_IP:$Server_Port/users/removeuser/3 && \
curl http://$Server_IP:$Server_Port/users/removeuser/4

Web2

$ kubectl create -f https://raw.githubusercontent.com/praparn/kubernetes_20180701/master/WorkShop_1.2_Pods_Service_Deployment/multicontainer/webmodule_pod2.yml
$ kubectl get pods
NAME                       READY     STATUS    RESTARTS   AGE
maindb                     1/1       Running   0          21m
web                        3/3       Running   0          19m
web2                       3/3       Running   0          42s

$ curl http://$Server_IP:$Server_Port
<H1> Welcome Page from Container Python Lab (Set 2) </H1>Checkpoint Date/Time: Sun Jul  8 06:52:21 2018
$ curl http://$Server_IP:$Server_Port
<H1> Welcome Page from Container Python Lab </H1>Checkpoint Date/Time: Sun Jul  8 06:52:24 2018

$ kubectl delete pods web
pod "web" deleted
$ kubectl get pods
NAME                       READY     STATUS    RESTARTS   AGE
maindb                     1/1       Running   0          23m
web2                       3/3       Running   0          2m
$ curl http://$Server_IP:$Server_Port
<H1> Welcome Page from Container Python Lab (Set 2) </H1>Checkpoint Date/Time: Sun Jul  8 06:53:25 2018

At service, there's no load balance yet. The pods are competitive.

Cleanup

$ kubectl delete -f https://raw.githubusercontent.com/praparn/kubernetes_20180701/master/WorkShop_1.2_Pods_Service_Deployment/multicontainer/webmodule_pod2.yml && \
kubectl delete -f https://raw.githubusercontent.com/praparn/kubernetes_20180701/master/WorkShop_1.2_Pods_Service_Deployment/multicontainer/webmodule_svc.yml && \
kubectl delete -f https://raw.githubusercontent.com/praparn/kubernetes_20180701/master/WorkShop_1.2_Pods_Service_Deployment/multicontainer/databasemodule_pod.yml && \
kubectl delete -f https://raw.githubusercontent.com/praparn/kubernetes_20180701/master/WorkShop_1.2_Pods_Service_Deployment/multicontainer/databasemodule_svc.yml

Summary

Replication Controller

Daemon Set

Make sure that Pods run on all (or some) node in cluster
When node add to cluster. Pods will deploy automatic
When node remove, GC will automatic remove Pod
When remove Daemon Set, Pods will automatic remove

Replication Controller

Daemon Set and Replication Controller is work similar.
RC (Replication Controller) will response:
- Create/Maintain Pods as ”Replication Controller” (Pods Farm)
- Keep copy of Pods (Replicas) as design
- Ensure that Pods is up and run with amount like design
  - If too much, It will kill some Pods
  - If too kill, It will create another replicas of Pods
- Auto healing if some Pods crash with any reason
- Maintenance on cluster-level not node level

Workshop 3: Replication Controller

$ kubectl create -f https://raw.githubusercontent.com/praparn/kubernetes_20180701/master/WorkShop_1.3_Replication_Controller/webtest_rc.yml
$ kubectl get rc
NAME      DESIRED   CURRENT   READY     AGE
webtest   3         3         3         47s
$ kubectl get pods
NAME                       READY     STATUS    RESTARTS   AGE
webtest-cn7zk              1/1       Running   0          52s
webtest-mzztp              1/1       Running   0          53s
webtest-wzwcj              1/1       Running   0          52s
$ kubectl create -f https://raw.githubusercontent.com/praparn/kubernetes_20180701/master/WorkShop_1.3_Replication_Controller/webtest_svc.yml
service "webtest" created
$ kubectl get svc
NAME         CLUSTER-IP       EXTERNAL-IP   PORT(S)          AGE
kubernetes   10.96.0.1        <none>        443/TCP          4h
webtest      10.100.156.224   <nodes>       5000:32500/TCP   43s


$ kubectl delete pods webtest-cn7zk
pod "webtest-cn7zk" deleted
$ kubectl get pods
NAME                       READY     STATUS              RESTARTS   AGE
webtest-cn7zk              0/1       Terminating         0          3m
webtest-lss7j              1/1       Running             0          24s
webtest-vzp8n              0/1       ContainerCreating   0          2s
webtest-wzwcj              1/1       Running             0          3m

$ kubectl scale --replicas=5 rc/webtest
replicationcontroller "webtest" scaled
$ kubectl get rc webtest
NAME      DESIRED   CURRENT   READY     AGE
webtest   5         5         3         5m

$ kubectl scale --replicas=5 -f https://raw.githubusercontent.com/praparn/kubernetes_20180701/master/WorkShop_1.3_Replication_Controller/webtest_rc.yml
replicationcontroller "webtest" scaled
$ kubectl get rc webtest
NAME      DESIRED   CURRENT   READY     AGE
webtest   5         5         2         6m

$ kubectl describe rc webtest

$ kubectl delete -f https://raw.githubusercontent.com/praparn/kubernetes_20180701/master/WorkShop_1.3_Replication_Controller/webtest_svc.yml
service "webtest" deleted
$ kubectl delete -f https://raw.githubusercontent.com/praparn/kubernetes_20180701/master/WorkShop_1.3_Replication_Controller/webtest_rc.yml
replicationcontroller "webtest" deleted

Deployment and ReplicaSet

What is deployment/RS?
- Deployment and RS (ReplicaSet) is set “next-generation of RC” by provide full function to maintain versioning of Pods in production (No downtime: On-the-fly)
  - Update new version (Rollout)
  - Revert old version (Rollback)
  - Pause/Resume process
  - Check status
ReplicaSet(RS) vs Replication Controller (RC)
- RS is generation that evolution from RC with capability more dynamic
  - RC support label with method “Equality-based requirement”
    
    RS support label with method “Equality-based requirement” and “Setbased
    
    requirement”

Deployment Update Strategy

Workshop 4: Deployment

$ kubectl create -f https://raw.githubusercontent.com/praparn/kubernetes_20180701/master/WorkShop_1.4_Deployment/webtest_deploy.yml --record
deployment "webtest" created
$ kubectl get deployments
NAME      DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
webtest   3         3         3            0           10s
$ kubectl get pods --show-labels
NAME                      READY     STATUS              RESTARTS   AGE       LABELS
webtest-77794cd4b-4g4ld   1/1       Running             0          24s       environment=development,module=WebServer,name=web,owner=Praparn_L,pod-template-hash=333507806,version=1.0
webtest-77794cd4b-gt928   1/1       Running             0          24s       environment=development,module=WebServer,name=web,owner=Praparn_L,pod-template-hash=333507806,version=1.0
webtest-77794cd4b-vcs5k   0/1       ContainerCreating   0          24s       environment=development,module=WebServer,name=web,owner=Praparn_L,pod-template-hash=333507806,version=1.0

$ kubectl create -f https://raw.githubusercontent.com/praparn/kubernetes_20180701/master/WorkShop_1.4_Deployment/webtest_svc.yml --record
service "webtest" created
$ kubectl get svc
NAME         CLUSTER-IP      EXTERNAL-IP   PORT(S)          AGE
kubernetes   10.96.0.1       <none>        443/TCP          4h
webtest      10.105.57.113   <nodes>       5000:32500/TCP   7s
$ kubectl get rs
NAME                DESIRED   CURRENT   READY     AGE
webtest-77794cd4b   3         3         3         1m

$ curl http://$Server_IP:32500
<H1> Welcome Page from Container Python Lab Web Version 1.00 </H1>Checkpoint Date/Time: Sun Jul  8 07:51:24 2018

$ kubectl describe deployment/webtest

$ kubectl set image deployment/webtest webtest=labdocker/cluster:webservicelite_v1.51rc
deployment "webtest" image updated
$ kubectl rollout status deployment/webtest
Waiting for rollout to finish: 1 out of 3 new replicas have been updated...
Waiting for rollout to finish: 1 out of 3 new replicas have been updated...
Waiting for rollout to finish: 1 out of 3 new replicas have been updated...
Waiting for rollout to finish: 2 out of 3 new replicas have been updated...
Waiting for rollout to finish: 2 out of 3 new replicas have been updated...
Waiting for rollout to finish: 1 old replicas are pending termination...
Waiting for rollout to finish: 1 old replicas are pending termination...
Waiting for rollout to finish: 1 old replicas are pending termination...
deployment "webtest" successfully rolled out

$ kubectl get deployment
NAME      DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
webtest   3         3         3            3           4m
$ kubectl get rs
NAME                 DESIRED   CURRENT   READY     AGE
webtest-67dc45c865   3         3         3         42s
webtest-77794cd4b    0         0         0         4m
$ kubectl get pods
NAME                       READY     STATUS    RESTARTS   AGE
webtest-67dc45c865-7qxns   1/1       Running   0          36s
webtest-67dc45c865-8rss5   1/1       Running   0          50s
webtest-67dc45c865-f9xtl   1/1       Running   0          38s

$ curl http://$Server_IP:32500
<H1> Welcome Page from Container Python Lab Web Version 1.51 RC </H1>Checkpoint Date/Time: Sun Jul  8 07:53:42 2018

$ kubectl get deployment
NAME      DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
webtest   3         3         3            3           6m
$ kubectl get rs
NAME                 DESIRED   CURRENT   READY     AGE
webtest-67dc45c865   0         0         0         2m
webtest-6886cb7964   3         3         3         33s
webtest-77794cd4b    0         0         0         6m
$ kubectl get pods
NAME                       READY     STATUS    RESTARTS   AGE
webtest-6886cb7964-d27m2   1/1       Running   0          21s
webtest-6886cb7964-r8q9p   1/1       Running   0          24s
webtest-6886cb7964-vs5r9   1/1       Running   0          37s

$ curl http://$Server_IP:32500
<H1> Welcome Page from Container Python Lab Web Version 1.80 GA </H1>Checkpoint Date/Time: Sun Jul  8 07:55:46 2018

$ curl http://$Server_IP:32500
<H1> Welcome Page from Container Python Lab Web Version 1.80 GA </H1>Checkpoint Date/Time: Sun Jul  8 07:55:46 2018

$ kubectl rollout history deployment/webtest
deployments "webtest"
REVISION	CHANGE-CAUSE
1		kubectl create --filename=https://raw.githubusercontent.com/praparn/kubernetes_20180701/master/WorkShop_1.4_Deployment/webtest_deploy.yml --record=true
2		kubectl set image deployment/webtest webtest=labdocker/cluster:webservicelite_v1.51rc
3		kubectl set image deployment/webtest webtest=labdocker/cluster:webservicelite_v1.8ga

$ kubectl rollout undo deployment/webtest --to-revision=2
deployment "webtest" rolled back
$ kubectl rollout status deployment/webtest
Waiting for rollout to finish: 2 out of 3 new replicas have been updated...
Waiting for rollout to finish: 2 out of 3 new replicas have been updated...
Waiting for rollout to finish: 2 out of 3 new replicas have been updated...
Waiting for rollout to finish: 1 old replicas are pending termination...
Waiting for rollout to finish: 1 old replicas are pending termination...
deployment "webtest" successfully rolled out

$ curl http://$Server_IP:32500
<H1> Welcome Page from Container Python Lab Web Version 1.51 RC </H1>Checkpoint Date/Time: Sun Jul  8 07:57:12 2018

$ kubectl delete deployment/webtest
deployment "webtest" deleted
$ kubectl delete -f https://raw.githubusercontent.com/praparn/kubernetes_20180701/master/WorkShop_1.4_Deployment/webtest_svc.yml
service "webtest" deleted

Setup & Running First App

Replication and Deployment

Services

Day 1 - First Half

Day 1 - Second Half

Day 1 - Second Half (2)

Day 2 - First Half

Day 1 - Second Half

Workshop 2: Pods, Service, Deployment

Part 1 - Single Container

Part 2 - Multiple Containers

Simple Architecture

More Robust Architecture

APIs

Main Database

Web Service

Pod YAML

Service YAML

Test

Web2

Cleanup

Summary

Replication Controller

Daemon Set

Replication Controller

Workshop 3: Replication Controller

Deployment and ReplicaSet

Deployment Update Strategy

Workshop 4: Deployment