Kubernetes 1.14.1 Installation using kubeadm on vSphere with CentOS7

1a-steps.md

Steps to Install Kubernetes on CentOS7 with Kubeadm and vSphere

1. On the master node: Edit the vsphere.conf file within the kubeadm-master.sh to match your environment. Copy kubeadm-master.sh to the master node:

sudo chmod u+x kubeadm-master.sh
sudo ./kubeadm-master.sh

2. On each worker node copy kubeadm-worker.sh:

sudo chmod u+x kubeadm-worker.sh
sudo ./kubeadm-worker.sh

3. On the master node, install flannel:

kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/bc79dd1505b0c8681ece4de4c0d86c5cd2643275/Documentation/kube-flannel.yml

4. On the master node, check to make sure the pods are all in the status Running:

$ kubectl get pods --all-namespaces

5. On the master node, export the master node config used to point the workers being joined to the master:

kubectl -n kube-public get configmap cluster-info -o jsonpath='{.data.kubeconfig}' > discovery.yaml

6. On the master node, transfer the discovery.yaml to every worker that will need it

scp discovery.yaml [email protected]:~/discovery.yaml

7. On the worker node, make sure yaml was successfully transferred:

cat discovery.yaml

8. On the worker node, join it to the cluster with kubeadm:

sudo kubeadm join --config /etc/kubernetes/kubeadminitworker.yaml

9. On the master node, verify the nodes were added to the cluster and the Provider for vSphere is correct:

$ kubectl get nodes -o wide
$ kubectl describe nodes | grep "ProviderID"

10. On the master node, create the StorageClass and a PersistentVolumeClaim to verify storage connectivity:

kubectl apply -f sc.yaml
kubectl apply -f pvc.yaml

kubeadm-master.sh

#!/bin/bash

#kubeadm master on CentOS 7

# Housekeeping
yum update -y
swapoff -a
sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab
systemctl disable firewalld
systemctl stop firewalld
setenforce 0
sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config
echo "Housekeeping done"

#Install Docker
yum install -y yum-utils device-mapper-persistent-data lvm2 yum-plugin-versionlock
yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
yum install -y docker-ce-18.06.2.ce-3.el7 docker-ce-cli-18.06.2.ce-3.el7 containerd.io
mkdir /etc/docker
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
systemctl daemon-reload
systemctl enable docker
groupadd docker
MAINUSER=$(logname)
usermod -aG docker $MAINUSER
systemctl start docker
yum versionlock docker-ce docker-ce-cli containerd.io
echo "Docker Installation done"

#Install K8s Stuff
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
exclude=kube*
EOF

yum install -y kubelet-1.14.1-0 kubeadm-1.14.1-0 kubectl-1.14.1-0 --disableexcludes=kubernetes
echo "Kube Stuff done"
systemctl enable --now kubelet
systemctl start kubelet
yum versionlock kubelet kubeadm kubectl
echo "Kubelet started done"

#Network Stuff
cat <<EOF >  /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sysctl --system
echo "Network Stuff done"

#Create the vSphere Config File
tee /etc/kubernetes/vsphere.conf >/dev/null <<EOF
[Global]
user = "[email protected]"
password = "VMware1!"
port = "443"
insecure-flag = "1"

[VirtualCenter "10.IP.ADD.RESS"]
datacenters = "Datacenter-A"

[Workspace]
server = "10.IP.ADD.RESS"
datacenter = "Datacenter-A"
default-datastore = "vsanDatastore"
resourcepool-path = "Cluster-A/Resources"
folder = "kubernetes"

[Disk]
scsicontrollertype = pvscsi

[Network]
public-network = "K8s"
EOF

#Activate the vSphere Cloud Provider in our kubeadm init config file.
#Additionally, as we are deploying flannel as our overlay network for pods and
# it requires the below subnet CIDR in order for the overlay to work.
tee /etc/kubernetes/kubeadminitmaster.yaml >/dev/null <<EOF
apiVersion: kubeadm.k8s.io/v1beta1
kind: InitConfiguration
bootstrapTokens:
       - groups:
         - system:bootstrappers:kubeadm:default-node-token
         token: y7yaev.9dvwxx6ny4ef8vlq
         ttl: 0s
         usages:
         - signing
         - authentication
nodeRegistration:
  kubeletExtraArgs:
    cloud-provider: "vsphere"
    cloud-config: "/etc/kubernetes/vsphere.conf"
---
apiVersion: kubeadm.k8s.io/v1beta1
kind: ClusterConfiguration
kubernetesVersion: v1.14.1
apiServer:
  extraArgs:
    cloud-provider: "vsphere"
    cloud-config: "/etc/kubernetes/vsphere.conf"
  extraVolumes:
  - name: cloud
    hostPath: "/etc/kubernetes/vsphere.conf"
    mountPath: "/etc/kubernetes/vsphere.conf"
controllerManager:
  extraArgs:
    cloud-provider: "vsphere"
    cloud-config: "/etc/kubernetes/vsphere.conf"
  extraVolumes:
  - name: cloud
    hostPath: "/etc/kubernetes/vsphere.conf"
    mountPath: "/etc/kubernetes/vsphere.conf"
networking:
  podSubnet: "10.244.0.0/16"
EOF

# Restart the kubelet daemon to reload the configuration
systemctl daemon-reload
systemctl restart kubelet

# Verify we have all the images
kubeadm config images pull

#Init kubeadm
kubeadm init --config /etc/kubernetes/kubeadminitmaster.yaml

#kubectl work for user
mkdir -p /home/$MAINUSER/.kube
cp -i /etc/kubernetes/admin.conf /home/$MAINUSER/.kube/config
chown -R ${MAINUSER}:${MAINUSER} /home/${MAINUSER}/.kube

kubeadm-worker.sh

#!/bin/bash

#kubeadm worker on CentOS 7

# Housekeeping
yum update -y
swapoff -a
sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab
systemctl disable firewalld
systemctl stop firewalld
setenforce 0
sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config
echo "Housekeeping done"

#Install Docker
yum install -y yum-utils device-mapper-persistent-data lvm2 yum-plugin-versionlock
yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
yum install -y docker-ce-18.06.2.ce-3.el7 docker-ce-cli-18.06.2.ce-3.el7 containerd.io
mkdir /etc/docker
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
systemctl daemon-reload
systemctl enable docker
groupadd docker
MAINUSER=$(logname)
usermod -aG docker $MAINUSER
systemctl start docker
yum versionlock docker-ce docker-ce-cli containerd.io
echo "Docker Installation done"

#Install K8s Stuff
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
exclude=kube*
EOF

yum install -y kubelet-1.14.1-0 kubeadm-1.14.1-0 kubectl-1.14.1-0 --disableexcludes=kubernetes
echo "Kube Stuff done"
systemctl enable --now kubelet
systemctl start kubelet
yum versionlock kubelet kubeadm kubectl
echo "Kubelet started done"

#Network Stuff
cat <<EOF >  /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sysctl --system
echo "Network Stuff done"

#Kubeadm config
tee /etc/kubernetes/kubeadminitworker.yaml >/dev/null <<EOF
apiVersion: kubeadm.k8s.io/v1beta1
discovery:
  file:
    kubeConfigPath: discovery.yaml
  timeout: 5m0s
  tlsBootstrapToken: y7yaev.9dvwxx6ny4ef8vlq
kind: JoinConfiguration
nodeRegistration:
  kubeletExtraArgs:
    cloud-provider: vsphere
EOF
echo "Kubeadm config ready"

pvc.yml

kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: pvc-claim
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 8Gi

ss-cluster.png

ss-datastore.png

ss-folder.png

ss-portgroup.png

storageclass.yml

kind: StorageClass
apiVersion: storage.k8s.io/v1
metadata:
  name: vsan-default
  annotations:
    storageclass.kubernetes.io/is-default-class: "true"
provisioner: kubernetes.io/vsphere-volume
parameters:
    storagePolicyName: "vSAN Default Storage Policy"
    datastore: vsanDatastore