day3-4-k8s-pod-depl-svc.txt

apt update
apt-get install -y apt-transport-https
apt install docker.io
snap install kubectl --classic
snap install kubelet --classic

curl -Lo ./kind https://kind.sigs.k8s.io/dl/v0.8.1/kind-linux-amd64
chmod +x kind 
mv kind /usr/local/bin/kind
vi config
kind: Cluster
apiVersion: kind.x-k8s.io/v1alpha4
nodes:
- role: control-plane
- role: worker
- role: worker

kind create cluster --config config 
kubectl get nodes



kubectl apply -f pod.yaml 
kubectl get pods
kubectl describe pod pod2



# k create ns myns1
# kubectl get ns
# k get pods -n kube-system -o wide

# kubectl run nginx ——image=nginx ——port=80 ——dry-run=client -o yaml > pod.yaml
# k explain po.spec.containers
# k explain po.spec…

K run nginx —image nginx 
K get pods
K run nginx —image nginx  —> error creating same pod in default namespace
K run nginx —image nginx -n myns1
K get pods -n myns1


Deployment
# k create deploy mydeploy ——image=nginx ——dy-run=client -o yaml > mydeploy.yaml
# k apply -f deploy 
# k get all
# k get pod -o wide



Scale up
# k scale deploy mydeploy ——replicas=5

# k autoscale deploy mydeploy ——cpu-percent=80 ——min=2 ——max=5

# k rollout history deploy mydeploy
# k rollout history deploy mydeploy —revision=1


# k rollout history deploy mydeploy
# k set image deploy mydeploy nginx=nginx:1.7.8    ——> old getting terminated and new getting created
# k get all —> see new replicaset
# k rollout history deploy mydeploy
# k rollout history deploy mydeploy - - revision=1
# k rollout history deploy mydeploy - - revision=2

# k rollout history deploy mydeploy
# k rollout undo deploy mydeploy         —> rollback
# k rollout undo deploy mydeploy ——to-revision=1


vi web-pod.yaml 
vi build/app.py 
kubectl get all
k delete po mysql web1
k delete svc mysql web
kubectl get all
kubectl get all -o wide
k get nodes
k get nodes -o wide
docker images
docker ps -a
k get all
k rollout undo deploy mydeploy
k get all
k rollout history deploy mydeploy
cd k8s/
cd service-demo/
cd build/
vi app.py 
cat requirements.txt 
cat Dockerfile 
cd ..
ls
cat web-pod.yaml 
cd -
docker build -t webapp:1.2 .
docker images
docker tag webapp:1.2 gbhure/webapp:1.2
docker push gbhure/webapp:1.2
cd ..
k get all
k delete deploy mydeploy
k get all
cat db-pod.yaml 
cat db-svc.yaml 
cat web-svc.yaml 
cat web-pod.yaml 
k apply -f db-pod.yaml 
k get all
k apply -f db-svc.yaml 
k get all
k apply -f web-pod.yaml 
k get all
k apply -f web-svc.yaml 
k get all
cat web-svc.yaml 
cat db-svc.yaml 
k get all -o wide
k get nodes -o wide
curl 172.18.0.2:30981/init
cat build/app.py 
export NODE_IP=172.18.0.2
export NODE_PORT=30981
curl -i -H "Content-Type: application/json" -X POST -d '{"uid": "1", "user":"John Doe"}' http://$NODE_IP:$NODE_PORT/users/add
curl -i -H "Content-Type: application/json" -X POST -d '{"uid": "2", "user":"Jane Doe"}' http://$NODE_IP:$NODE_PORT/users/add
curl http://$NODE_IP:$NODE_PORT/users/1


 2047  k create ns myns1
 2048  k get ns
 2049  k get pods
 2050  k get pods -n myns1
 2051  k describe ns
 2052  k describe ns myns1
 2053  k describe ns 
 2054  k get pods -A
 2055  k get pods --all-namespaces
 2057  k run nginx --image nginx
 2058  k get all
 2059  k get pos
 2060  k get pods
 2061  k run nginx --image nginx
 2062  k run nginx --image nginx -n myns1
 2063  k run nginx --image nginx
 2064  k get pods
 2065  k get pods -n myns1
 2066  k get pods --all-namespaces
 2068  k delete ns myns1
 2069  k get ns
 2070  k get pods --all-namespaces
 2072  k apply -f web-svc.yml  -n myns1
 2073  k create ns myns1
 2074  k apply -f web-svc.yml  -n myns1
 2075  k get all
 2076  k get pods --all-namespaces
 2078  k apply -f web-svc.yml --namespace=myns1
 2079  k get pods --all-namespaces
 2081  k apply -f web-pod.yaml --namespace=myns1
 2082  k get pods --all-namespaces
 2083  vi web-pod.yaml