install

install/End-End Tests

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+Run a simple nginx deployment:
+
+kubectl run nginx --image=nginx
+View the deployments in your cluster:
+
+kubectl get deployments
+View the pods in the cluster:
+
+kubectl get pods
+Use port forwarding to access a pod directly:
+
+kubectl port-forward $pod_name 8081:80
+Get a response from the nginx pod directly:
+
+curl --head http://127.0.0.1:8081
+View the logs from a pod:
+
+kubectl logs $pod_name
+Run a command directly from the container:
+
+kubectl exec -it $pod_name -- nginx -v
+Create a service by exposing port 80 of the nginx deployment:
+
+kubectl expose deployment nginx --port 80 --type NodePort
+List the services in your cluster:
+
+kubectl get services
+Get a response from the service:
+
+curl -I localhost:$node_port
+List the nodes' status:
+
+kubectl get nodes
+View detailed information about the nodes:
+
+kubectl describe nodes
+View detailed information about the pods:
+
+kubectl describe pods
+
+
+All Kube Commands: https://kubernetes.io/docs/reference/generated/kubectl/kubectl-commands#-strong-getting-started-strong-

install/README.md

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+## Install Kubernets on Ubuntu 18.04 LTS 
+
+### Step1: `On All Machines ( Master & All nodes ):`
+
+   sudo apt-get update
+   sudo apt-get install -y apt-transport-https ca-certificates curl software-properties-common
+
+   curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
+   sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
+   sudo apt-get update ; clear
+   sudo apt-get install -y docker-ce
+   sudo service docker start ; clear
+
+   echo "deb http://apt.kubernetes.io/ kubernetes-xenial main" | sudo tee /etc/apt/sources.list.d/kubernetes.list
+   curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -
+   sudo apt-get update ; clear
+   sudo apt-get install -y kubelet kubeadm kubectl	
+
+### Step2: `On Master only:`
+
+   sudo kubeadm init --pod-network-cidr=10.244.0.0/16
+
+   sudo mkdir -p $HOME/.kube
+   sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
+   sudo chown $(id -u):$(id -g) $HOME/.kube/config
+
+   kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/2140ac876ef134e0ed5af15c65e414cf26827915/Documentation/kube-flannel.yml
+
+   kubectl get nodes
+   kubectl get all --all-namespaces
+
+### Step3: `On Nodes only:`
+       
+    copy the kubeadm join token from master & run it on all nodes
+          
+    Ex: kubeadm join 10.128.15.231:6443 --token mks3y2.v03tyyru0gy12mbt \
+           --discovery-token-ca-cert-hash sha256:3de23d42c7002be0893339fbe558ee75e14399e11f22e3f0b34351077b7c4b56
+
+
+## Install K8s: CentOS WITH 2 CPUS & 4GB RAM
+
+### Step1: `On All Machines ( Master & All nodes ):`
+
+   ### Set SELinux in permissive mode (effectively disabling it)
+     setenforce 0
+     sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config
+
+   ### Install Docker
+     sudo yum remove -y docker docker-client docker-client-latest docker-common docker-latest docker-latest-logrotate docker-logrotate docker-engine docker-ce docker-ce-cli containerd.io
+     sudo yum install -y yum-utils device-mapper-persistent-data lvm2
+     sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
+     sudo yum install -y docker-ce docker-ce-cli containerd.io
+     systemctl enable --now docker
+     systemctl start docker
+
+   ### Install kubeadm,kubelet,kubectl
+     cat <<EOF > /etc/yum.repos.d/kubernetes.repo
+     [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
+     EOF
+
+     yum install -y kubelet kubeadm kubectl --disableexcludes=kubernetes
+     systemctl enable --now kubelet
+
+### Step2: `On Master only:`
+
+   sudo kubeadm init --pod-network-cidr=10.244.0.0/16
+
+   sudo mkdir -p $HOME/.kube
+   sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
+   sudo chown $(id -u):$(id -g) $HOME/.kube/config
+
+   kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/2140ac876ef134e0ed5af15c65e414cf26827915/Documentation/kube-flannel.yml
+
+   kubectl get nodes
+   kubectl get all --all-namespaces
+
+### Step3: `On Nodes only:`
+
+    copy the kubeadm join token from master & run it on all nodes
+
+    Ex: kubeadm join 10.128.15.231:6443 --token mks3y2.v03tyyru0gy12mbt \
+           --discovery-token-ca-cert-hash sha256:3de23d42c7002be0893339fbe558ee75e14399e11f22e3f0b34351077b7c4b56

install/backup-cluster.txt

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+Backing up your cluster can be a useful exercise, especially if you have a single etcd cluster, as all the cluster state is stored there. The etcdctl utility allows us to easily create a snapshot of our cluster state (etcd) and save this to an external location. In this lesson, we’ll go through creating the snapshot and talk about restoring in the event of failure.
+
+
+Get the etcd binaries:
+wget https://github.com/etcd-io/etcd/releases/download/v3.3.12/etcd-v3.3.12-linux-amd64.tar.gz
+
+Unzip the compressed binaries:
+tar xvf etcd-v3.3.12-linux-amd64.tar.gz
+
+Move the files into /usr/local/bin:
+sudo mv etcd-v3.3.12-linux-amd64/etcd* /usr/local/bin
+
+Take a snapshot of the etcd datastore using etcdctl:
+sudo ETCDCTL_API=3 etcdctl snapshot save snapshot.db --cacert /etc/kubernetes/pki/etcd/server.crt --cert /etc/kubernetes/pki/etcd/ca.crt --key /etc/kubernetes/pki/etcd/ca.key
+
+View the help page for etcdctl:
+ETCDCTL_API=3 etcdctl --help
+
+Browse to the folder that contains the certificate files:
+ls /etc/kubernetes/pki/etcd/
+cd
+
+View that the snapshot was successful:
+ETCDCTL_API=3 etcdctl --write-out=table snapshot status snapshot.db
+
+Zip up the contents of the etcd directory:
+sudo tar -zcvf etcd.tar.gz /etc/kubernetes/pki/etcd
+
+Copy the etcd directory to another server:

install/bootstrap-cluster.md

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+## Calico pod network
+```
+	sudo kubeadm init
+		Note: note down the kubeadm join command 
+
+	sudo mkdir -p $HOME/.kube
+	sudo rm $HOME/.kube/config
+	sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
+	sudo chown $(id -u):$(id -g) $HOME/.kube/config
+
+	sudo kubectl apply -f https://docs.projectcalico.org/v3.8/manifests/calico.yaml
+```
+## how to find kubeadm join token later
+```
+token=`kubeadm token generate`
+kubeadm token create "$token" --print-join-command --ttl=0
+```
+
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+
+## Flannel pod network
+```
+	sudo kubeadm init --pod-network-cidr=10.244.0.0/16
+	
+	sudo mkdir -p $HOME/.kube
+	sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
+	sudo chown $(id -u):$(id -g) $HOME/.kube/config
+
+	make note of kubeadm join command to be run on Nodes
+	
+	for coredns pods to come up run below
+		kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/2140ac876ef134e0ed5af15c65e414cf26827915/Documentation/kube-flannel.yml
+```

install/cluster-api-info.txt

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+kubectl get all --all-namespaces
+
+kubectl api-resources
+kubectl api-resources --namespaced=true      # All namespaced resources
+kubectl api-resources --namespaced=false     # All non-namespaced resources
+kubectl api-resources -o name                # All resources with simple output (just the resource name)
+kubectl api-resources -o wide                # All resources with expanded (aka "wide") output
+kubectl api-resources --verbs=list,get       # All resources that support the "list" and "get" request verbs
+kubectl api-resources --api-group=extensions # All resources in the "extensions" API group
+kubectl api-versions                         # List api group
+kubectl explain resourcename .  # kubectl explain pod

install/config-locations.txt

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+/etc/kubernetes/	                                           # Config folder
+/etc/kubernetes/pki/	                                       # Certificate files
+/etc/kubernetes/kubelet.conf	                               # Credentials to API server
+/etc/kubernetes/admin.conf	                                   # Superuser credentials
+~/.kube/config	                                               # kubectl config file
+/var/lib/kubelet/	                                           # Kubernets working dir
+/var/lib/docker/, /var/log/containers/	                       # Docker working dir
+/var/lib/etcd/	                                               # Etcd working dir
+/etc/cni/net.d/	                                               # Network cni
+/var/log/pods/	                                               # Log files
+/etc/systemd/system/kubelet.service.d/10-kubeadm.conf	       # Env
+export KUBECONFIG=/etc/kubernetes/admin.conf	               # Env
+/lib/systemd/system/kubelet.service                            # systemd unit file for kubelet
+/lib/systemd/system/docker.service                             # systemd unit file for docker
+
+
+
+journalctl -u kubelet                                          # to view the kubelet logs
+journalctl -u kube-proxy

install/install-k8s-centos.md

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+# Install K8s: CentOS 18 LTS WITH 2 CPUS & 4GB RAM
+
+### Install Docker
+
+`sudo yum remove -y docker docker-client docker-client-latest docker-common docker-latest docker-latest-logrotate docker-logrotate docker-engine docker-ce docker-ce-cli containerd.io`
+
+`sudo yum install -y yum-utils device-mapper-persistent-data lvm2`
+
+`sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo`
+
+`sudo yum install -y docker-ce docker-ce-cli containerd.io`
+
+`systemctl enable --now docker`
+
+`systemctl start docker`
+
+### Install kubeadm,kubelet,kubectl
+
+```
+cat <<EOF > /etc/yum.repos.d/kubernetes.repo
+[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
+EOF
+```
+##### Set SELinux in permissive mode (effectively disabling it)
+
+`setenforce 0`
+
+`sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config`
+
+`yum install -y kubelet kubeadm kubectl --disableexcludes=kubernetes`
+
+`systemctl enable --now kubelet`

install/install-k8s-centos.sh

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+#!/bin/bash
+
+#### Remove if a cluster is already running
+sudo kubeadm reset -f
+sleep 30
+
+#### Remove any pre installed docker packages  
+sudo yum remove -y docker docker-client docker-client-latest docker-common docker-latest docker-latest-logrotate docker-logrotate docker-engine docker-ce docker-ce-cli containerd.io
+cd /var/lib
+sudo rm -r docker
+
+#### Install Specific Docker version
+sudo yum install -y yum-utils device-mapper-persistent-data lvm2
+sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
+sudo yum install -y docker-ce docker-ce-cli containerd.io
+if [ $? -eq 0 ];then
+     echo "docker-ce-$version is successfully installed"
+else
+     echo "issue with docker-ce installation - process abort"
+     exit 1
+fi
+sudo systemctl enable --now docker
+sudo systemctl start docker
+echo " "
+
+sudo yum remove -y kubeadm kubelet kubectl
+#### Install Kubernetes latest components
+echo "starting the installation of k8s components (kubeadm,kubelet,kubectl) ...."
+cat <<EOF > /etc/yum.repos.d/kubernetes.repo
+[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
+EOF
+
+sudo setenforce 0
+sudo sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config
+sudo yum install -y kubelet kubeadm kubectl --disableexcludes=kubernetes
+sudo systemctl enable --now kubelet
+if [ $? -eq 0 ];then
+     echo "kubelet, kubeadm & kubectl are successfully installed"
+else
+     echo "issue in installing kubelet, kubeadm & kubectl - process abort"
+     exit 2
+fi
+echo " "