# Upgrading Avantra Agents

You have the option to upgrade Avantra Agents manually or automatically (recommended).

## Upgrading to Java 17

With the release of Avantra Agent version 23.3.x and above, the Java runtime support has changed as follows:

Supported JRE versions for Avantra agents
Agent Version | JRE 8 | JRE 17
--- | --- | ---
23.2.x and below |
    YES
    NO
23.3.x up to 23.9.x |
    YES
    YES
24.x and above |
    NO
    YES

### Considerations for a JRE 17 upgrade

The table above shows that, if you are upgrading an existing landscape to use Java 17, you MUST bring all agents to a version of the Avantra agent in the 23.3.x codeline first in order to swap out the Java runtime for JRE 17. We highligh recommend using the built-in automatic agent and JRE upgrade system as described later on this page to do both the agent upgrade and the JRE upgrade. This will also bring the JRE version under the control of Avantra (what we call an internal Java runtime). For the avoidance of doubt, the internal java runtime lives within the Agent installation folder and is only used by Avantra. An external java runtime would be controlled and provided by another source and usually is configured on the $PATH usually via a package manager.

#### Upgrade path to Java 17 for Avantra Agents

Customers upgrading their existing installations from an earlier version are advised to follow this procedure:

The high level procedure can be seen in the following diagram:

- Bring your Avantra Server up to a minimum of version 23.3.x

- [IMPORTANT] Bring all agents up to a minimum version of 23.3.x using the built-in `Agent Updates` feature in the `Administration` menu. This is the only agent version that supports both Java runtime 8 as well as 17.

- Upload a Java 17 runtime into Avantra Server under `Administration` - `Agent Updates` in the new tab `Java Packages`. Note you will not see this tab if your Avantra Server is not at 23.3.x or above.

- Start by upgrade ONE (1) agent of a non-critical system to use the new Java 17 runtime by going to the `Status` tab and selecting `Select systems for a Java update`, select your system and select the new JRE you have just uploaded.

  - Once the Java update has completed successfully and the agent is functioning correctly (wait 15 minutes for all cycles to complete or force a full check cycle). Make sure to check within Avantra that the server is showing as running under Java 17 within 15 minutes of the update.

- Once you have successfully upgraded one agent, you can proceed to upgrade more. We recommend doing these in increasing buckets of agents in case you run into issues. For example, if you have 100 agents to upgrade then follow this approach:

  - 1 agent to check the process

  - 4 agents to verify the process

  - 15 agents

  - 30 agents

  - 50 agents

## Upgrading Agents Automatically

Avantra Agents are able to perform Agent Self Updates. These updates can be initiated centrally from the Avantra UI, so the installation of patches and new versions becomes easy in all Avantra environments. You need the Trigger Agent Updates Permission in order to perform automatic updates.

You can also trigger the update of the Java runtime for agents from within the same area of Avantra.

Procedure: Automated upgrade of Avantra Agents (Linux & Windows)

The Agent Self Updates work as follows:

1. There is just one(!) upgrade package for the Avantra Agent which is valid for all supported operating systems. This is the file called `agent-25.0.n.bin` available for download from the Avantra Customer Hub. Yes the `.bin` file works for both Linux and windows.

2. You can upload the packages using Avantra WebUI and the Avantra Agents retrieve the packages through the Avantra Server and avantra-gateway infrastructure.

3. Avantra WebUI provides an interface that allows you to select the Avantra Agents to be upgraded. You can either choose items from the Server list or define an ad-hoc Selectors.

   Select Administration Agent Updates from the top-level menu. Select the Packages tab. Choose Upload from the toolbar.

   Choose the packages from your computer and start the upload.

4. Select Administration Agent Updates from the top-level menu. Select Select Systems for… Agent Update from the toolbar.

5. Fill in appropriate values for the Selectors and push OK.

6. Choose the appropriate version from the drop-down list and set the flags on the Servers you want to update.

7. Confirm your selection by pushing the Start Agent Update button.

8. The Status tab contains the latest status information about the recently scheduled agent updates. You may want to choose the value `Running and Errors` from the drop-down list in the toolbar to watch the update progress.

9. Once the download has finished successfully, the package is extracted, the Avantra Agent is stopped, old files are replaced, and the newly installed Avantra Agent is started.

| In order to avoid too many Avantra Agents trying to download the packages at the same time, the update requests are queued. Only update-simultaneous-downloads update requests are triggered at the same time and there is a delay of schedule-wait-time before the next bunch of update requests is triggered, etc. These two parameters can be configured as described in Change Properties for the WebUI.

While the whole process usually works very smoothly, there are a few items to observe:

Small is beautiful

  If you plan to upgrade your Avantra Agents, start with one or two Physical Servers first and test the upgrade procedure as well as the new Avantra Agent. If you feel comfortable with the new version, continue with the rest of your Avantra Agents. By default, Avantra Agents running already on the target release are not upgraded, unless you enforce this.

Downgrade

  If the upgrade process went well, but the new Avantra Agent does not work as expected, you can also use this feature to downgrade Avantra Agents to the last known good version. With the exception of where the agent you are downgrading to does not support the Java runtime in place for the agent.

Version Information

  On Microsoft Windows systems the version information shown in the Programs and Features dialog of the control panel will not be updated. This should not cause concern.

| See Troubleshooting Agent Updates in case of any issues.

## Manual upgrade of Agents (Linux)

Procedure: Manual upgrade of Avantra Agents on Linux

1. Log into the server and stop Avantra agent services. You can stop your Avantra services either using `systemd` or via the Avantra rc file (systemctl is recommended)

       $ sudo systemctl stop avantra-agent

   OR

       $ /opt/avantra/agent/rc.agent stop

2. Switch user to the service user running your Avantra agent and change into the avantra directory. The example below assumes the service user is called `avantra` and Avantra is installed to the directory `/opt/avantra`.

       $ sudo su avantra
       avantra$ cd /opt/avantra/

3. Download the installer file `agent-[version].bin` and make it executable

       avantra$ curl -o agent-25.0.n.bin 'https://........link...from...customer...hub....'
       avantra$ chmod +x agent-25.0.n.bin

4. Perform the upgrade of your Avantra agent

   Note that we use the `--start=no` flag in this case so we can manually restart our Avantra agent after the upgrade using `systemctl`. If you are using the `rc` files to start and stop your services, you do not need the `--start=no` flag.

       avantra$ ./agent-{product-release-n}.bin -- --start=no

5. Restart your Avantra agent (either using `systemctl` or the `rc.agent` file)

   For the `systemctl` option, first we `exit` back to a sudo-capable user.

       avantra$ exit
       $ sudo systemctl start avantra-agent

   OR for the `rc.agent` method:

       avantra$ /opt/avantra/agent/rc.agent start

## Manual upgrade of Agents (Windows)

Simply install the new version of Avantra Agent as described in Installing the Agent on Microsoft Windows.