**Installing the Lightwave Client on a Photon Image and Joining the Client to a Domain** After you have set up a Lightwave domain controller, you can join Photon clients to that domain. You install the Lightwave client first. After the client is installed, you join the client to the domain. **Prerequisites** - Prepare a Photon OS client for the Lightwave client installation. - Verify that the hostname of the client can be resolved. - Verify that you have 184 MB free for the Lightwave client installation. **Procedure** 1. Log in to your Photon OS client over SSH. 2. Install the Lightwave client by running the following command. `# tdnf install lightwave-client -y` 3. Edit the `iptables` firewall rules configuration file to allow connections on port `2020` as a default setting. The default Photon OS 2.0 firewall settings block all incoming, outgoing, and forwards so that you must configure the rules. 1. Open the iptables settings file. `# vi /etc/systemd/scripts/iptables` 2. Add allow information over tcp for port 2020 in the end of the file, save, and close the file. `iptables -A INPUT -p tcp -m tcp --dport 2020 -j ACCEPT` 3. Run the following command to allow the required connections without restarting the client. `# iptables -A INPUT -p tcp -m tcp --dport 2020 -j ACCEPT` 4. Join the client to the domain by running the `domainjoin.sh` script and configuring the domain controller FQDN, domain, and the password for the `administrator` user. `# domainjoin.sh --domain-controller <lightwave-server-FQDN> --domain <your-domain> --password '<administrator-user-password>` 5. In a browser, go to https://*Lightwave-Server-FQDN* to verify that the client appears under the tenants list for the domain.