This article explains the steps to change/update the MOM Key of an existing cluster with a newly created Mom Key created for the same area.
Please note that the MOM Keys should be created for the same area.

Example use case: You have a trial Mom key for an Area A and you decided to get a new Prod Mom Key for the same Area A and instead of creating a new cluster and do the setup, you can update the existing cluster with the newly created Prod Mom Key.
 

Steps to follow for Mashery Local Docker
1. Login as root
2. Stop Javaproxy using command “service stop Javaproxy"
3. Open the proxy configuration file
vi /etc/mashery-proxy-config.json
4. Under the “com.mashery.proxy.onpremloader” section update the value of "apiKey": “<old Mom key>” to <new Mom key>
5. Under the “com.mashery.proxy.onpremloader” section update the value of "apiSecret": “<old Mom secret>” to <new Mom Secret>

Sample format of  com.mashery.proxy.onpremloader
    "com.mashery.proxy.onpremloader": {
        "packagesEndpoint": "https://api-mom.mashery.com/mom/packages", 
        "tokensLastModifiedShift": 5000, 
        "apiKey": “xxxxxxx", 
        "packageKeysEndpoint": "https://api-mom.mashery.com/mom/packagekeys", 
        "devclassesEndpoint": "https://api-mom.mashery.com/mom/devclasses", 
        "servicesEndpoint": "https://api-mom.mashery.com/mom/services", 
        "tokensLastPushedShift": 5000, 
        "apiSecret": “xxxxxx", 
        "developersEndpoint": "https://api-mom.mashery.com/mom/developers", 
        "tokensEndpoint": "https://api-mom.mashery.com/mom/tokens", 
        "httpsClientSecurityEndpoint": "https://api-mom.mashery.com/mom/httpsclientsecurity", 
        "updatesEndpoint": "https://api-mom.mashery.com/mom/p2", 
        "momReadTimeout": 120000, 
        "momConnectTimeout": 30000, 
        "maxUploadLogSizeMB": 10, 
        "logsEndpoint": "https://api-mom.mashery.com/mom/logs", 
        "appsEndpoint": "https://api-mom.mashery.com/mom/apps"
    }
6. Validate that the Json formatting is intact
7. Start Javaproxy using "service start Javaproxy"
8. Verify that the syncs are functioning