Install the license server component

Follow the steps in this section to install the license server component.

Prerequisites

You must first deploy the PX-Backup chart, and all components should be in running state.
On a worker node, set the value of the px/ls label to true by entering the following command:
```
kubectl label node <NODE_NAME> px/ls=true
```
Enable SSH access on port 7070.
1. On the node where you’ve set the value of the px/ls label to true, add the following line to the /etc/sysconfig/iptables file:
```
-A INPUT -p tcp -m state --state NEW -m tcp --dport 7070 -j ACCEPT in /etc/sysconfig/iptables file
```
2. Restart the iptables service by entering the following command:
```
systemctl restart iptables.service
```
If you’re running PX-Central on Openshfift, then you must add a new service account to the privileged SCC. Enter the oc edit scc privileged command and add the following line to the users section, replacing <YOUR_NAMESPACE> with your namespace:
```
system:serviceaccount:<YOUR_NAMESPACE>:pxcentral-license-server
```

Prepare air-gapped environments

If your cluster is internet-connected, skip this section. If your cluster is air-gapped, you must pull the license server and related Docker images to either your Docker registry or directly onto your nodes.

Run the following command to create an environment variable called kube_version and assign your Kubernetes version to it:
```
kube_version=`kubectl version --short | awk -Fv '/Server Version: / {print $3}'`
```
Pull the following required Docker images onto your air-gapped environment:
- docker.io/portworx/px-els:1.0.0
- docker.io/portworx/pxcentral-onprem-els-ha-setup:1.1.1
Pull the license server and related Docker images. How you do this depends on your air-gapped cluster configuration:
- If you have a company-wide docker-registry server, pull the Portworx license server and related Docker images from Portworx:
```
sudo docker pull <required-docker-images>
sudo docker tag <required-docker-images> <company-registry-hostname>:5000<path-to-required-docker-images>
sudo docker push <company-registry-hostname>:5000<path-to-required-docker-images>
```
- If you do not have a company-wide docker-registry server, pull the license server and related Docker images from Portworx onto a computer that can access the internet and send it to your air-gapped cluster. The following example sends the Docker image to the air-gapped cluster over ssh:
```
sudo docker pull <required-docker-images>
sudo docker save <required-docker-images> | ssh root@<air-gapped-address> docker load
```
  Install the license server component
Generate the install spec through the License Server and Monitoring spec generator.

If you’re using Portworx for the PX-Central installation, select the Use storage class checkbox under the Storage section of the Spec Details tab, and enter the name of the storage class you used to install PX-Central.

If your cluster is air-gapped, select the Air Gapped checkbox, and enter the following information:
- Custom Registry: The hostname of your custom registry
- Image Repository: The path to the required Docker images
- Image Pull Secret(s): A comma-separated list of your image pull secrets.
Using Helm, add the Portworx Enterprise repo to your cluster and update it:
```
helm repo add portworx http://charts.portworx.io/ && helm repo update
```
Install the license server component using either the --set flag or the values.yml file provided in the Step 2 section of the Complete tab of the spec generator.