Upgrade Apigee mTLS

This section explains how to upgrade Apigee mTLS to Apigee Edge for Private Cloud v4.51.00.

Apigee mTLS is supported on Apigee Edge for Private Cloud versions 4.51.00, 4.50.00, 4.19.06, and 4.19.01. You cannot use apigee-mtls on versions 4.18.* or lower.

Before you begin

Apigee recommends that you perform backups of the Cassandra, Postgres, and Zookeeper services before you upgrade Apigee mTLS.

Upgrading

To upgrade Apigee mTLS:

Stop all Apigee components, including apigee-mtls, by executing the following command:
```
/opt/apigee/apigee-service/bin/apigee-all stop
```

Uninstall Apigee mTLS by executing the following command:

/opt/apigee/apigee-service/bin/apigee-service apigee-mtls uninstall

Reinstall Apigee mTLS by executing the following command:

/opt/apigee/apigee-service/bin/apigee-service apigee-mtls install

Execute the following command:

apigee-service apigee-mtls setup -f /opt/silent.conf

Start apigee-mtls on all hosts by executing the following command:
```
/opt/apigee/apigee-service/bin/apigee-service apigee-mtls start
```
Start the remaining Private Cloud components by following the existing startup sequence documentation.
Note: It may take as long as 3-5 minutes for Zookeeper to re-establish its quorum within the mTLS service mesh. This may or may not be of consequence depending on how much—or how little—automation is used during the restart process.
Follow the existing update/upgrading ordering steps for other components.