I followed the below procedure for Control plane provision.
Provision the Kubernetes Control Plane
Create the Kubernetes configuration directory:
sudo mkdir -p /etc/kubernetes/config
### Download and Install the Kubernetes Controller Binaries
Download the official Kubernetes release binaries:
wget -q --show-progress --https-only --timestamping \
"https://storage.googleapis.com/kubernetes-release/release/v1.13.0/bin/linux/amd64/kube-apiserver" \
"https://storage.googleapis.com/kubernetes-release/release/v1.13.0/bin/linux/amd64/kube-controller-manager" \
"https://storage.googleapis.com/kubernetes-release/release/v1.13.0/bin/linux/amd64/kube-scheduler" \
"https://storage.googleapis.com/kubernetes-release/release/v1.13.0/bin/linux/amd64/kubectl"
Install the Kubernetes binaries:
{
chmod +x kube-apiserver kube-controller-manager kube-scheduler kubectl
sudo mv kube-apiserver kube-controller-manager kube-scheduler kubectl /usr/local/bin/
}
Configure the Kubernetes API Server
{
sudo mkdir -p /var/lib/kubernetes/
sudo cp ca.crt ca.key kube-apiserver.crt kube-apiserver.key \
service-account.key service-account.crt \
etcd-server.key etcd-server.crt \
encryption-config.yaml /var/lib/kubernetes/
}
The instance internal IP address will be used to advertise the API Server to members of the cluster. Retrieve the internal IP address for the current compute instance:
INTERNAL_IP=$(ip addr show enp0s8 | grep "inet " | awk '{print $2}' | cut -d / -f 1)
Verify it is set
echo $INTERNAL_IP
Create the kube-apiserver.service
systemd unit file:
cat <<EOF | sudo tee /etc/systemd/system/kube-apiserver.service
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
[Service]
ExecStart=/usr/local/bin/kube-apiserver \\
--advertise-address=${INTERNAL_IP} \\
--allow-privileged=true \\
--apiserver-count=3 \\
--audit-log-maxage=30 \\
--audit-log-maxbackup=3 \\
--audit-log-maxsize=100 \\
--audit-log-path=/var/log/audit.log \\
--authorization-mode=Node,RBAC \\
--bind-address=0.0.0.0 \\
--client-ca-file=/var/lib/kubernetes/ca.crt \\
--enable-admission-plugins=NodeRestriction,ServiceAccount \\
--enable-swagger-ui=true \\
--enable-bootstrap-token-auth=true \\
--etcd-cafile=/var/lib/kubernetes/ca.crt \\
--etcd-certfile=/var/lib/kubernetes/etcd-server.crt \\
--etcd-keyfile=/var/lib/kubernetes/etcd-server.key \\
--etcd-servers=https://192.168.5.11:2379,https://192.168.5.12:2379 \\
--event-ttl=1h \\
--encryption-provider-config=/var/lib/kubernetes/encryption-config.yaml \\
--kubelet-certificate-authority=/var/lib/kubernetes/ca.crt \\
--kubelet-client-certificate=/var/lib/kubernetes/kube-apiserver.crt \\
--kubelet-client-key=/var/lib/kubernetes/kube-apiserver.key \\
--kubelet-https=true \\
--runtime-config=api/all \\
--service-account-key-file=/var/lib/kubernetes/service-account.crt \\
--service-cluster-ip-range=10.96.0.0/24 \\
--service-node-port-range=30000-32767 \\
--tls-cert-file=/var/lib/kubernetes/kube-apiserver.crt \\
--tls-private-key-file=/var/lib/kubernetes/kube-apiserver.key \\
--v=2
Restart=on-failure
RestartSec=5
[Install]
WantedBy=multi-user.target
EOF
The kube-controller-manager Kubernetes Configuration File
Generate a kubeconfig file for the kube-controller-manager
service:
{
kubectl config set-cluster kubernetes-the-hard-way \
--certificate-authority=ca.crt \
--embed-certs=true \
--server=https://127.0.0.1:6443 \
--kubeconfig=kube-controller-manager.kubeconfig
kubectl config set-credentials system:kube-controller-manager \
--client-certificate=kube-controller-manager.crt \
--client-key=kube-controller-manager.key \
--embed-certs=true \
--kubeconfig=kube-controller-manager.kubeconfig
kubectl config set-context default \
--cluster=kubernetes-the-hard-way \
--user=system:kube-controller-manager \
--kubeconfig=kube-controller-manager.kubeconfig
kubectl config use-context default --kubeconfig=kube-controller-manager.kubeconfig
}
Results:
kube-controller-manager.kubeconfig
The kube-scheduler Kubernetes Configuration File
Generate a kubeconfig file for the kube-scheduler
service:
{
kubectl config set-cluster kubernetes-the-hard-way \
--certificate-authority=ca.crt \
--embed-certs=true \
--server=https://127.0.0.1:6443 \
--kubeconfig=kube-scheduler.kubeconfig
kubectl config set-credentials system:kube-scheduler \
--client-certificate=kube-scheduler.crt \
--client-key=kube-scheduler.key \
--embed-certs=true \
--kubeconfig=kube-scheduler.kubeconfig
kubectl config set-context default \
--cluster=kubernetes-the-hard-way \
--user=system:kube-scheduler \
--kubeconfig=kube-scheduler.kubeconfig
kubectl config use-context default --kubeconfig=kube-scheduler.kubeconfig
}
### Configure the Kubernetes Controller Manager
Move the kube-controller-manager
kubeconfig into place:
sudo mv kube-controller-manager.kubeconfig /var/lib/kubernetes/
Create the kube-controller-manager.service
systemd unit file:
cat <<EOF | sudo tee /etc/systemd/system/kube-controller-manager.service
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/kubernetes/kubernetes
[Service]
ExecStart=/usr/local/bin/kube-controller-manager \\
--address=0.0.0.0 \\
--cluster-cidr=192.168.5.0/24 \\
--cluster-name=kubernetes \\
--cluster-signing-cert-file=/var/lib/kubernetes/ca.crt \\
--cluster-signing-key-file=/var/lib/kubernetes/ca.key \\
--kubeconfig=/var/lib/kubernetes/kube-controller-manager.kubeconfig \\
--leader-elect=true \\
--root-ca-file=/var/lib/kubernetes/ca.crt \\
--service-account-private-key-file=/var/lib/kubernetes/service-account.key \\
--service-cluster-ip-range=10.96.0.0/24 \\
--use-service-account-credentials=true \\
--v=2
Restart=on-failure
RestartSec=5
[Install]
WantedBy=multi-user.target
EOF
### Configure the Kubernetes Scheduler
Move the kube-scheduler
kubeconfig into place:
sudo mv kube-scheduler.kubeconfig /var/lib/kubernetes/
Create the kube-scheduler.service
systemd unit file:
cat <<EOF | sudo tee /etc/systemd/system/kube-scheduler.service
[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/kubernetes/kubernetes
[Service]
ExecStart=/usr/local/bin/kube-scheduler \\
--kubeconfig=/var/lib/kubernetes/kube-scheduler.kubeconfig \\
--address=127.0.0.1 \\
--leader-elect=true \\
--v=2
Restart=on-failure
RestartSec=5
[Install]
WantedBy=multi-user.target
EOF
Start the Controller Services
{
sudo systemctl daemon-reload
sudo systemctl enable kube-apiserver kube-controller-manager kube-scheduler
sudo systemctl start kube-apiserver kube-controller-manager kube-scheduler
}
Verification
kubectl get componentstatuses --kubeconfig admin.kubeconfig
But this is giving the statuses UNKNOWN, not sure where did it go wrong. As far as I know I followed all the steps without fail, but the API server is not coming up.