August | 2020 | Infra Cloud Solutions

Container Analysis –

Google Container Registry provides secure, private Docker image storage on Google Cloud Platform.

gcloud commands

Build using Dockerfile

Get your Cloud project ID by running the following command:

gcloud config get-value project

ovidiu@cloudshell:~$ gcloud config set project ovidev-yy58yy
Updated property [core/project].

ovidiu@cloudshell:~ (ovidev-yy58yy)$ gcloud config get-value project
Your active configuration is: [cloudshell-yy279]
ovidev-yy58yy

2. Run the following command from the directory containing Dockerfile, where project-id is your Cloud project ID:

ovidiu@cloudshell:~/quickstart-docker (ovidev-yy58yy)$ gcloud builds submit –tag gcr.io/ovidev-yy5816/ovi-image

You’ve just built a Docker image named ovi-image using a Dockerfile and pushed the image to Container Registry.

To disable gcloud command-line tool metrics collection, run the following command in your Cloud Shell session:

gcloud config set disable_usage_reporting true

Readiness Probe

Container Analysis

GKE Cluster IP Allocation

Use “kubectl explain <resource>” for a detailed description of that resource (e.g. kubectl explain pods).

**** Create GKE CLUSTER ****

ovidiu@cloudshell:~$ gcloud projects list

ovidiu@cloudshell:~$ gcloud config set project dev-1

commands used to create a two-node cluster for studying

gcloud config set compute/zone us-central1-a
gcloud config set compute/region us-central1

The default Kubernetes version is available using the following command

ovidiu@cloudshell:~ (dev-1)$ gcloud container get-server-config

gcloud container clusters create ovi-cluster --cluster-version=1.17.13-gke.2600 --image-type=ubuntu --num-nodes=2

or 

gcloud container clusters create ${CLUSTER_NAME} --preemptible --zone ${INSTANCE_ZONE} --scopes cloud-platform --num-nodes 3

ovidiu@cloudshell:~(dev-1)$ gcloud container clusters create ovi-cluster --preemptible --cluster-version=1.16.13-gke.401 --image-type=ubuntu --num-nodes=1

ovidiu@cloudshell:~(dev-1758yy)$ kubectl get nodes
NAME                                         STATUS   ROLES    AGE   VERSION
gke-ovi-cluster-default-pool-095e58a2-5vvx   Ready    <none>   75s   v1.16.13-gke.401
gke-ovi-cluster-default-pool-095e58a2-t2f9   Ready    <none>   75s   v1.16.13-gke.401

If you don't specific cluster version - default version is used 

ovidiu@cloudshell:~(dev-1)$ gcloud container clusters create ovi2-cluster --preemptible --image-type=ubuntu --num-nodes=2
ovidiu@cloudshell:~ (dev-1)$ kubectl cluster-info
ovidiu@cloudshell:(dev-1)$ kubectl config current-context
gke_dev-1_us-central1-a_ovi2-cluster

ovidiu@cloudshell:(dev-1)$ kubectl config get-contexts

ovidiu@cloudshell:(dev-1)$ kubectl config use-context gke_asixdev-175816_us-central1-a_ovi-cluster

ovidiu@cloudshell:~(dev-1)$ kubectl config view

gcloud container clusters list

ovidiu@cloudshell:~ (dev-17)$ gcloud container clusters list
NAME          LOCATION       MASTER_VERSION   MASTER_IP       MACHINE_TYPE   NODE_VERSION     NUM_NODES    STATUS
ovi2-cluster  us-central1-a  1.16.13-gke.401  104.154.207.56  n1-standard-1  1.16.13-gke.401    2          RUNNING

kubectl config get-contexts # display list of contexts 
kubectl config current-context # display the current-context
kubectl config use-context my-cluster-name # set the default context to my-cluster-name

#deployment

ovidiu@cloudshell:~ (dev-1758yy)$ kubectl create deployment nginx --image=nginx
deployment.apps/nginx created

ovidiu@cloudshell:~ (dev-1758yy)$ kubectl get pods
NAME                     READY   STATUS    RESTARTS   AGE
nginx-86c57db685-xtz6m   1/1     Running   0          13s


kubectl create deployment redis-deploy --image redis --namespace=ovi-ns --dry-run=client -o yaml > ovi_deploy.yaml

ovidiu@cloudshell:~ (dev-153320)$ k set image deploy/nginxd nginx=nginx:1.16
deployment.apps/nginxd image updated

ovidiu@cloudshell:~/ (dev-153320)$ k describe deploy nginxd | grep -i image
Image: nginx:1.16

ovidiu@cloudshell:~/ (dev-153320)$ kubectl rollout undo deployment/nginxd
deployment.apps/nginxd rolled back

ovidiu@cloudshell:~/ (dev-153320)$ k describe deploy nginxd | grep -i image
Image: nginx


#pod 

ovidiu@cloudshell:~ (dev-1)$ kubectl run nginx --image=nginx --restart=Never
pod/nginx created

ovidiu@cloudshell:~(dev-1)$ kubectl run nginx --image=nginx restart=Never --port=80 --expose
service/nginx created
pod/nginx created

ovidiu@cloudshell:(dev-1)$ kubectl get svc nginx
NAME       TYPE           CLUSTER-IP    EXTERNAL-IP           PORT(S)      AGE
nginx     ClusterIP      10.3.250.183      <none>             80/TCP     3m12s

ovidiu@cloudshell:~(dev-1)$ kubectl get ep
NAME         ENDPOINTS          AGE
kubernetes  34.123.5.10:443      52m
nginx 3m21s

get logs 

ovidiu@cloudshell:~(dev-1)$ kubectl logs nginx

if the pod crashed and restarted, get the logs of the previous instance  

ovidiu@cloudshell:~(dev-1)$ kubectl logs nginx -p


#job
-----

ovidiu@cloudshell:~ (dev-1758yy)$ kubectl create job nginx --image=nginx  #job
job.batch/nginx created


#cron job
----------

ovidiu@cloudshell:~ (dev-1758yy)$ kubectl create cronjob nginx --image=nginx --schedule="* * * * *"
cronjob.batch/nginx created


#config map 
------------

ovidiu@cloudshell:~ (dev-1758yy)$ kubectl create configmap app-config --from-literal=keyovi=valueovi
configmap/app-config created

ovidiu@cloudshell:~ (dev-1)$ vi config.txt
ovidiu@cloudshell:~ (dev-1)$ more config.txt
ovi3=test3
ovi4=test4
ovidiu@cloudshell:~ (dev-1)$ kubectl create cm ovicm --from-file=config.txt
configmap/ovicm created

ovidiu@cloudshell:~(dev-175816)$ kubectl describe cm ovicm
Name: ovicm
Namespace: default
Labels: <none>
Annotations: <none>

Data
====
config.txt:
—-
ovi3=test3
ovi4=test4

Events: <none>


#create a namespace
-------------------


ovidiu@cloudshell:~/exam (dev-1758yy)$ kubectl create namespace ovi
namespace/ovi created

ovidiu@cloudshell:~/exam (dev-1758yy)$ kubectl create deployment nginx --image=nginx -n ovi
deployment.apps/nginx created

ovidiu@cloudshell:~/exam (dev-175816)$ kubectl get pods -n ovi
NAME                     READY   STATUS    RESTARTS   AGE
nginx-86c57db685-ffhfg   1/1     Running   0          69s

Create a service

ovidiu@cloudshell:~/exam (dev-1758yy)$ vi nginx.yaml

ovidiu@cloudshell:~/exam (dev-1758yy)$ kubectl create -f nginx.yaml
service/nginx created
ovidiu@cloudshell:~/exam (dev-1758yy)$ kubectl get service
NAME         TYPE           CLUSTER-IP     EXTERNAL-IP   PORT(S)        AGE
kubernetes   ClusterIP      10.3.240.1     <none>        443/TCP        36m
nginx        LoadBalancer   10.3.242.209   <pending>     80:30625/TCP   16s


ovidiu@cloudshell:~/exam (dev-1758yy)$ kubectl get service
NAME         TYPE           CLUSTER-IP     EXTERNAL-IP     PORT(S)        AGE
kubernetes   ClusterIP      10.3.240.1     <none>          443/TCP        37m
nginx        LoadBalancer   10.3.242.209   35.202.30.161   80:30625/TCP   81s


#deployment 


ovidiu@cloudshell:~/exam (dev-175816)$ vi nginx-deployment.yaml

ovidiu@cloudshell:~/exam (dev-175816)$ kubectl apply -f nginx-deployment.yaml
deployment.apps/nginx-deployment created

ovidiu@cloudshell:~/exam (dev-1758yy)$ kubectl get pods
NAME READY STATUS RESTARTS AGE
nginx-deployment-574b87c764-8sjr2 1/1 Running 0 12s
nginx-deployment-574b87c764-rl2v4 1/1 Running 0 12s
nginx-deployment-574b87c764-s67f5 1/1 Running 0 12s


ovidiu@cloudshell:~/exam (dev-1)$ kubectl get deployments
NAME READY UP-TO-DATE AVAILABLE AGE
nginx-deployment 3/3 3 3 116s

ovidiu@cloudshell:~/exam (dev-1)$ kubectl get rs
NAME DESIRED CURRENT READY AGE
nginx-deployment-574b87c764 3 3 3 10m
ovidiu@cloudshell:~/exam (dev-1758yy)$ kubectl get pods --show-labels
NAME READY STATUS RESTARTS AGE LABELS
nginx-deployment-574b87c764-8sjr2 1/1 Running 0 11m app=nginx,pod-template-hash=574b87c764
nginx-deployment-574b87c764-rl2v4 1/1 Running 0 11m app=nginx,pod-template-hash=574b87c764
nginx-deployment-574b87c764-s67f5 1/1 Running 0 11m app=nginx,pod-template-hash=574b87c764

ovidiu@cloudshell:~/exam (dev-1)$ kubectl describe deployments

from cli 

ovidiu@cloudshell:~ (dev-1)$ kubectl create deploy ovid --image=nginx --replicas=3 --port=80 -n ovi

ovidiu@cloudshell:~ (dev-1)$ kubectl expose deploy ovid --port=6363 --target-port=80 -n ovi

#cronjob 

ovidiu@cloudshell:~/exam (dev-1758yy)$ kubectl get jobs --watch
NAME COMPLETIONS DURATION AGE
hello-1603371240 0/1 2m57s 2m57s
hello-1603371300 0/1 117s 117s
hello-1603371360 0/1 57s 57s
hello-1603371420 0/1 0s
hello-1603371420 0/1 0s 0s

ovidiu@cloudshell:~ (dev-1758yy)$ kubectl get cronjob hello
NAME SCHEDULE SUSPEND ACTIVE LAST SCHEDULE AGE
hello */1 * * * * False 1 60s 82s

ovidiu@cloudshell:~ (dev-1758yy)$ kubectl describe cronjob hello


# replica set

ovidiu@cloudshell:~(dev-1)$ kubectl get rs
NAME    DESIRED CURRENT READY AGE
frontend 3        3       3    5h11m

ovidiu@cloudshell:~/(dev-1)$ kubectl autoscale rs frontend --max=10 --min=3 --cpu-percent=50
horizontalpodautoscaler.autoscaling/frontend autoscaled

#pv and pvc 

ovidiu@cloudshell:~/ (dev-1758yy)$ vi pv-3.yaml 

ovidiu@cloudshell:~/exam (dev-175816)$ kubectl apply -f pv-3.yaml
persistentvolume/task-pv-volume created

ovidiu@cloudshell:~/exam (dev-1758yy)$ kubectl get pv
NAME          CAPACITY  ACCESS  MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE
task-pv-volume 50Mi       RWO Retain  Available manual 6s

ovidiu@cloudshell:~/exam (dev-1758yy)$ vi pvc.yaml
ovidiu@cloudshell:~/exam (dev-1758yy)$ kubectl apply -f pvc.yaml
persistentvolumeclaim/task-pv-claim created

ovidiu@cloudshell:~/exam (dev-175816)$ kubectl get pv
NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE
task-pv-volume 50Mi RWO Retain Bound ovi/task-pv-claim manual 3m36s

ovidiu@cloudshell:~/exam (dev-175816)$ kubectl get pvc
NAME           STATUS        VOLUME         CAPACITY   ACCESS MODES   STORAGECLASS   AGE
task-pv-claim  Bound   task-pv-volume          50Mi      RWO            manual       24s


# node afinity 

# labels

kubectl get node node01 –show-labels

kubectl label node node01 color=blue

No need to keep the cluster around when not studying, so:

gcloud container clusters delete ovi-cluster

ovidiu@cloudshell:~/exam (dev-1758yy)$ gcloud container clusters delete ovi-cluster
The following clusters will be deleted.
– [ovi-cluster] in [us-central1-a]

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