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A Cloud Guru

Taking Configuration Snapshots in JBoss EAP

When making changes to a JBoss EAP server configuration, it's often worthwhile to ensure copies of these configurations exist, both to revert to a snapshot should a change fail or simply to save a successful configuration for use on other servers. To do this, we can work with JBoss EAP's native snapshot feature to take, manage, and remove configuration snapshots.

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Path Info

Level

Beginner

Duration

15m

Published

Jan 24, 2020

Challenge

Deploy a Standalone Server Based on the Provided Snapshot
1. Stop the current JBoss EAP server:
```
sudo systemctl stop jboss-eap-rhel
```
2. Move into the JBoss EAP home directory:
```
 cd /opt/jboss-eap
```
3. Start a standalone server using the 20191121-201850161standalone.xml snapshot:
```
 sudo ./bin/standalone.sh --server-config=standalone_xml_history/snapshot/20191121-201850161standalone.xml
```
4. Check that you can access the management console at PUBLICIP:9990.
5. Shut down the server with CTRL+C.
Challenge

Take a Snapshot of the Current Deployment
Before replacing the configuration file, we want to take a snapshot of the current configuration located at /opt/jboss-eap/standalone/configuration/standalone.xml just in case something fails.

Note: This is the configuration used by our service and the one used in the /opt/jboss/bin/standalone.sh script, unless we override it as we did in the previous task.
1. Restart the JBoss service:
```
sudo systemctl start jboss-eap-rhel
```
2. Open the JBoss CLI:
```
sudo ./bin/jboss-cli.sh
```
3. Connect to the server:
```
connect
```
4. Take a snapshot of the current configuration:
```
:take-snapshot
```
5. Exit the CLI:
```
exit
```
Challenge

Replace the Standalone Configuration
1. We know the 20191121-201850161standalone.xml configuration is the one we wish to use. Since we know our jboss-eap-rhel service relies on /opt/jboss-eap/standalone/configuration/standalone.xml, we can just copy our snapshot there:
```
sudo cp standalone/configuration/standalone_xml_history/snapshot/20191121-201850161standalone.xml standalone/configuration/standalone.xml
```
2. Restart the service:
```
sudo systemctl restart jboss-eap-rhel
```
3. Confirm you can access the management console.
Challenge

Delete the Old Snapshot
1. Access the JBoss CLI:
```
sudo ./bin/jboss-cli.sh
```
2. Connect to the server:
```
connect
```
3. List the available snapshots:
```
:list-snapshots
```
4. Remove the backup snapshot of the failing configuration:
```
:delete-snapshot(name=20191122-133032735standalone.xml)
```
5. Exit the CLI:
```
exit
```

Author

A Cloud Guru

The Cloud Content team comprises subject matter experts hyper focused on services offered by the leading cloud vendors (AWS, GCP, and Azure), as well as cloud-related technologies such as Linux and DevOps. The team is thrilled to share their knowledge to help you build modern tech solutions from the ground up, secure and optimize your environments, and so much more!

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