Workshop

Example for Centos.

ssh centos@PUBLIC_IP

1. Install kubernetes

Install Docker

sudo yum install -y docker
sudo systemctl enable docker && sudo systemctl start docker

Install kubeadm, kubelet & kubectl

sudo bash -c 'cat > /etc/yum.repos.d/kubernetes.repo' << EOF
[kubernetes]
name=Kubernetes
baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
exclude=kube*
EOF
sudo setenforce 0
sudo yum install -y kubelet kubeadm kubectl --disableexcludes=kubernetes
sudo systemctl enable kubelet && sudo systemctl start kubelet

Install kubernetes

sudo sysctl net.bridge.bridge-nf-call-iptables=1
sudo kubeadm init --pod-network-cidr=10.244.0.0/16 --kubernetes-version=stable-1.11

Configurate kubectl

mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

Check

Check components

[centos@demo ~]$ kubectl get cs
NAME                 STATUS    MESSAGE              ERROR
scheduler            Healthy   ok                   
controller-manager   Healthy   ok                   
etcd-0               Healthy   {"health": "true"}  

Check pods

[centos@demo ~]$ kubectl get po --all-namespaces
NAMESPACE     NAME                                                                    READY     STATUS    RESTARTS   AGE
kube-system   coredns-78fcdf6894-jdfsl                                                0/1       Pending   0          1m
kube-system   coredns-78fcdf6894-jrdpv                                                0/1       Pending   0          1m
kube-system   etcd-demo.eu-central-1.compute.internal                                 1/1       Running   0          1m
kube-system   kube-apiserver-demo.eu-central-1.compute.internal                       1/1       Running   0          51s
kube-system   kube-controller-manager-demo.eu-central-1.compute.internal              1/1       Running   0          1m
kube-system   kube-proxy-w8jdr                                                        1/1       Running   0          1m
kube-system   kube-scheduler-demo.eu-central-1.compute.internal                       1/1       Running   0          1m

Install Flanel

kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/v0.10.0/Documentation/kube-flannel.yml

Check pods

[centos@demo ~]$ kubectl get po --all-namespaces
NAMESPACE     NAME                                                                    READY     STATUS    RESTARTS   AGE
kube-system   canal-87jrb                                                             3/3       Running   0          6m
kube-system   coredns-78fcdf6894-jdfsl                                                1/1       Running   0          13m
kube-system   coredns-78fcdf6894-jrdpv                                                1/1       Running   1          13m
kube-system   etcd-demo.eu-central-1.compute.internal                                 1/1       Running   0          13m
kube-system   kube-apiserver-demo.eu-central-1.compute.internal                       1/1       Running   0          12m
kube-system   kube-controller-manager-demo.eu-central-1.compute.internal              1/1       Running   0          13m
kube-system   kube-proxy-w8jdr                                                        1/1       Running   0          13m
kube-system   kube-scheduler-demo.eu-central-1.compute.internal                       1/1       Running   0          13m

Master Isolation

kubectl taint nodes --all node-role.kubernetes.io/master-

3. Deploy simple app "Hello world"

Create deployment

kubectl create -f https://raw.githubusercontent.com/containerum/sk-workshop/master/hello/hello-deploy.yaml

Create service

kubectl create -f https://raw.githubusercontent.com/containerum/sk-workshop/master/hello/hello-service.yaml

Get Service

kubectl get svc

NAME         TYPE           CLUSTER-IP      EXTERNAL-IP   PORT(S)          AGE
hw           LoadBalancer   10.103.70.246   <pending>     5000:30180/TCP   16s
kubernetes   ClusterIP      10.96.0.1       <none>        443/TCP          21m

Go to browser

https://ip:30180

where ip is IP of your VM

4. Deploy Containerum

Deploy Helm

curl https://raw.githubusercontent.com/kubernetes/helm/master/scripts/get > get_helm.sh
chmod 700 get_helm.sh
./get_helm.sh

kubectl create -f https://raw.githubusercontent.com/containerum/sk-workshop/master/helm/rbac.yaml
helm init --service-account tiller

Check:

helm list

Deploy Ingress Controller

kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/mandatory.yaml

bash -c 'cat > ingress.yaml' << EOF
apiVersion: v1
kind: Service
metadata:
  name: ingress-nginx
  namespace: ingress-nginx
spec:
  ports:
  - name: http
    port: 80
    targetPort: 80
    protocol: TCP
  - name: https
    port: 443
    targetPort: 443
    protocol: TCP
  selector:
    app.kubernetes.io/name: ingress-nginx
  externalIPs:
  - %EXTERNAL IP%
EOF

kubectl apply -f ingress.yaml

Check:

kubectl get pods --namespace=ingress
NAME                                                         READY     STATUS    RESTARTS   AGE
musty-bobcat-nginx-ingress-controller-659565fbc6-zx8fj       1/1       Running   0          46s
musty-bobcat-nginx-ingress-default-backend-c57dc4765-d72hp   1/1       Running   0          46s

Deploy Containerum

helm repo add containerum https://charts.containerum.io
helm repo update
helm install containerum/containerum

kubectl label node $HOSTNAME role=slave

5. Deploy WP+MySQL

This app uses Volumes

Create PersistentVolume

kubectl create -f https://raw.githubusercontent.com/containerum/sk-workshop/master/wp/pv.yaml

[centos@demo ~]$ kubectl get pv
NAME       CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS      CLAIM     STORAGECLASS   REASON    AGE
mysql-pv   10Gi       RWO            Retain           Available             manual                   7s
wp-pv      10Gi       RWO            Retain           Available             manual                   7s

Create PersistentVolumeClaim

kubectl create -f https://raw.githubusercontent.com/containerum/sk-workshop/master/wp/pvc.yaml

[centos@demo ~]$ kubectl get pvc
NAME        STATUS    VOLUME     CAPACITY   ACCESS MODES   STORAGECLASS   AGE
mysql-pvc   Bound     mysql-pv   10Gi       RWO            manual         7s
wp-pvc      Bound     wp-pv      10Gi       RWO            manual         7s

Create Secret for MySQL Password

kubectl create secret generic mysql-pass --from-literal=password=strongpassword

[centos@demo ~]$ kubectl get secrets
NAME                  TYPE                                  DATA      AGE
default-token-546hk   kubernetes.io/service-account-token   3         39m
mysql-pass            Opaque                                1         12s

Deploy MySQL

kubectl create -f https://raw.githubusercontent.com/containerum/sk-workshop/master/wp/mysql.yaml

Deploy WP

kubectl create -f https://raw.githubusercontent.com/containerum/sk-workshop/master/wp/wp.yaml