# Remotely Upgrade Multiple Photon OS Machines With Lightwave Client and Photon Management Daemon Installed
After you have a configured the Photon Management Daemon (PMD) on multiple machines, you can remotely upgrade any installed package on these machines.
Upgrade process uses `copenapi_cli` that is supported from both Lightwave and Photon Management Daemon. You can initiate the upgrade process from any machine that has Photon Management Daemon installed.
## Prerequisites
- Have an installed Lightwave server with configured domain controller on it.
- Have installed Lightwave clients that are joined to the domain.
- Have installed Photon Management Daemon on the clients.
## Procedure
1. To initiate remote upgrade, log in to a Photon OS machine over SSH to install the Photon Management Daemon CLI.
`# tdnf install pmd-cli`
2. Edit the `copenapi_cli` spec files so that you can specify the machines you want to upgrade and credentials to be used.
1. Edit the `.netrc` file to specify machines to be upgraded and credentials for the PMD service.
`# vi ~/.netrc`
3. In the file, enter the IP addresses for the machines and administrative credentials, save and close the file.
`# machine <IP-address> login <pmd-administrative-user> password <pmd-administrative user-password>`
1. (Optional) Get the location of the `restapispec.json` file.
`# cat ~/.copenapi`
This command returns `apispec=/root/restapispec.json` as path for the spec file.
3. Edit the `restapispec.json` file to enter the IP address of the machine to be upgraded.
`# vi /root/restapispec.json`
4. Change the `host` value to the IP address or the hostname of the machine, leave the port number, and save and close the file.
`"host":"<ip-address>:2081"`
4. Initiate the upgrade, in this example of the `sed` package and wait for the command to complete.
Specify `-k` to force blind trust of certificates and `-n` to use the credentials from the `.netrc` file.
`# copenapi_cli pkg update --packages sed -kn`
5. (Optional) Verify that the package was upgraded successfully.
1. Log in to the machine that was upgraded over SSH.
2. List the installed version of the `sed` package.
`# tdnf list installed sed`