Complete Kubernetes Open Source Tutorial

https://github.com/cyberpau/book-of-gists/tree/master/configs/VMWare-Network

yum -y update
yum -y install net-tools wget telnet yum-utils device-mapper-persistent-data lvm2

dhclient -v

wget -O - https://raw.githubusercontent.com/cyberpau/book-of-gists/master/automation-scripts/install-k8s-docker-on-centOS-8.sh | bash

#!/bin/bash
# Authored by John Paulo Mataac

if [[ $EUID > 0 ]]
then echo "Exiting... Please run as root"
exit
fi

### Update and install prerequisite tools
yum -y update
yum -y install net-tools wget telnet yum-utils device-mapper-persistent-data lvm2

### Add Docker repository.
yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

### Install Docker CE.
yum install -y docker-ce-18.06.2.ce

### Create /etc/docker directory.
mkdir /etc/docker

### Setup daemon.
cat > /etc/docker/daemon.json <<EOF
{
"exec-opts": ["native.cgroupdriver=systemd"],
"log-driver": "json-file",
"log-opts": {
"max-size": "100m"
},
"storage-driver": "overlay2",
"storage-opts": [
"overlay2.override_kernel_check=true"
]
}
EOF

mkdir -p /etc/systemd/system/docker.service.d

### Restart Services
systemctl daemon-reload
systemctl enable docker
systemctl restart docker

### Disable swap
swapoff -a
sed -i 's/^\(.*swap.*\)$/#\1/' /etc/fstab 

### load netfilter probe specifically
modprobe br_netfilter

### disable SELinux. If you want this enabled, comment out the next 2 lines. But you may encounter issues with enabling SELinux
setenforce 0
sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config

### Install kubernetes packages
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 -y install kubectl kubelet kubeadm
systemctl  restart kubelet && systemctl enable kubelet

### Enable IP Forwarding
echo '1' > /proc/sys/net/bridge/bridge-nf-call-iptables
cat <<EOF >  /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF


### Restarting services
systemctl daemon-reload
systemctl restart kubelet

### Install nfs utils for Kubernetes NFS driver
yum -y install nfs-utils

# Create a service using the definition in example-service.yaml.
kubectl apply -f example-service.yaml

# Create a replication controller using the definition in example-controller.yaml.
kubectl apply -f example-controller.yaml

# Create the objects that are defined in any .yaml, .yml, or .json file within the <directory> directory.
kubectl apply -f <directory>

# List all pods in plain-text output format.
kubectl get pods

# List all pods in plain-text output format and include additional information (such as node name).
kubectl get pods -o wide

# List the replication controller with the specified name in plain-text output format. Tip: You can shorten and replace the 'replicationcontroller' resource type with the alias 'rc'.
kubectl get replicationcontroller <rc-name>

# List all replication controllers and services together in plain-text output format.
kubectl get rc,services

# List all daemon sets in plain-text output format.
kubectl get ds

# List all pods running on node server01
kubectl get pods --field-selector=spec.nodeName=server01

# Display the details of the node with name <node-name>.
kubectl describe nodes <node-name>

# Display the details of the pod with name <pod-name>.
kubectl describe pods/<pod-name>

# Display the details of all the pods that are managed by the replication controller named <rc-name>.
# Remember: Any pods that are created by the replication controller get prefixed with the name of the replication controller.
kubectl describe pods <rc-name>

# Describe all pods
kubectl describe pods

# Delete a pod using the type and name specified in the pod.yaml file.
kubectl delete -f pod.yaml

# Delete all the pods and services that have the label '<label-key>=<label-value>'.
kubectl delete pods,services -l <label-key>=<label-value>

# Delete all pods, including uninitialized ones.
kubectl delete pods --all

# Get output from running 'date' from pod <pod-name>. By default, output is from the first container.
kubectl exec <pod-name> -- date

# Get output from running 'date' in container <container-name> of pod <pod-name>.
kubectl exec <pod-name> -c <container-name> -- date

# Get an interactive TTY and run /bin/bash from pod <pod-name>. By default, output is from the first container.
kubectl exec -ti <pod-name> -- /bin/bash

# Return a snapshot of the logs from pod <pod-name>.
kubectl logs <pod-name>

# Start streaming the logs from pod <pod-name>. This is similar to the 'tail -f' Linux command.
kubectl logs -f <pod-name>