Installing Kubernetes manually

Procedure

If you use proxy servers for the Internet connectivity, ensure that the following entries are available in the /etc/profile file:

export http_proxy=<IP address of the proxy server and port number>
export https_proxy=<IP address of the proxy server and port number>
export no_proxy=<IP address of the NPS host>,localhost,XXX.X.X.X,XX.XX.X.X/XX,XX.XX.X.X/XX,<hostname>
export KUBECONFIG=/etc/kubernetes/admin.conf

Navigate to the Kubernetes local repo using the following command:
```
cd <directory_path>/nps2/install/utils/kubernetes_repo
```
directory_path: The path where the untar operation of nps.tar.gz is done.
To install Kubernetes, execute the following command:
```
yum install *.rpm -y
```
To disable the swap partitions and modify the /etc/fstab file for persistence, execute the following commands:
```
swapoff –a
sed -i '/swap/s/^/#/g' /etc/fstabfstab
```
To add the NPS VM IP for firewalld and reload, execute the following commands:
```
firewall-cmd --permanent --add-source=<nps_vm_ip>
firewall-cmd --reload
```
To stop and disable firewall daemon, execute the following commands:
```
systemctl disable firewalld
systemctl stop firewalld
```

To enable traffic forwarding, execute the following commands:

echo "net.bridge.bridge-nf-call-iptables=1" > /etc/sysctl.d/k8s.conf; sysctl --system

To create the required folders and mark the labels for SELinux, execute the following commands:

setenforce 0
sed -i 's/enforcing/permissive/g' /etc/selinux/config
mkdir -p /var/lib/etcd
chcon -R -t container_file_t /var/lib/etcd
mkdir -p /etc/kubernetes
chcon -R -t container_file_t /etc/kubernetes
mkdir -p /var/nps
chcon -R -t container_file_t /var/nps

After Kubernetes is successfully installed, the Kubernetes cluster must be initialized. To initialize the Kubernetes cluster, perform the following steps:
1. To enable and start the kubelet daemon, execute the following commands:
```
systemctl enable kubelet
systemctl restart kubelet
```
2. To initialize the cluster, execute the following command:
```
kubeadm init --kubernetes-version=1.18.8
```
3. After the initialization is successfully completed, to copy the config file, execute the following commands:
```
mkdir -p /root/.kube
cp /etc/kubernetes/admin.conf /root/.kube/config
chown 666 /root/.kube/config
```

To set up the container networking, execute the following commands:

kubectl apply -f "https://cloud.weave.works/k8s/net?k8s-version=$
(kubectl version | base64 | tr -d '\n')&env.IPALLOC_RANGE=<ipalloc_range_cidr>"

By default, the Kubernetes cluster is set up as a master. This configuration does not allow any functional containers to be scheduled on the master node. To convert this node to a single node cluster, execute the following command:
```
kubectl taint nodes --all node-role.kubernetes.io/master-
```

To create the required folders for NPS toolkit and copy the Kubernetes configuration file, execute the following commands:

mkdir -p /var/nps/platform/api/ssl/certs 
mkdir -p /var/nps/platform/api/ssl/private
cp /root/.kube/config /var/nps/platform/api/ssl
chmod 444 /var/nps/platform/api/ssl/config

NOTE:

If you want to clean up the Kubernetes installation, execute the following commands:

kubeadm reset –f
systemctl disable kubelet
systemctl stop kubelet
rm –rf /etc/kubernetes /var/lib/etcd /root/.kube /var/nps/platform/api/ssl/config
rpm -ev kubeadm kubelet kubectl kubernetes-cni