Step 2: Manually Update Configuration Files

After upgrading core using a manual offline or rolling upgrade method, update your configuration files.

Note: This task is applicable to all manual upgrade methods: offline and rolling upgrades.

Important: After upgrading but before enabling new features, all nodes in your cluster must be upgraded, and all configuration files must be updated.

To manually update the configuration files:

On all nodes, manually merge new configuration settings from the /opt/mapr/conf.new/warden.conf file into the /opt/mapr/conf/warden.conf file.
For secure clusters: On all nodes, manually copy /opt/mapr/conf.new/mapr.login.conf to the /opt/mapr/conf/ directory, and set the file permissions to 0644. This file contains Zookeeper security information.
On all nodes, manually merge new configuration settings from the files in the /opt/mapr/conf/conf.d.new/ directory to the files in the /opt/mapr/conf/conf.d/ directory.
Manually merge the port and authentication configuration information in the /opt/mapr/conf/web.conf directory from the pre-6.0 release version to the /opt/mapr/apiserver/conf/properties.cfg file of the upgraded release version.
For example, the following from the /opt/mapr/conf/web.conf file from the pre-6.0 version must be manually copied over to the /opt/mapr/apiserver/conf/properties.cfg file of the new version:
```
# HTTPS Settings
mapr.webui.https.port=8443
mapr.rest.auth.methods=kerberos,basic // if kerberos auth 
```
Manually merge new configuration settings in /opt/mapr/conf/fuse.conf file with custom settings in /opt/mapr/conf/fuse.conf.backup file and restart FUSE for the settings to take effect.
After the upgrade, on all supported operating systems other than Ubuntu, the new fuse.conf file and a backup copy of the fuse.conf file from prior version named fuse.conf.backup are available in the /opt/mapr/conf directory. You can find the new parameters with default values in the new fuse.conf file and your custom settings from the prior version in the fuse.conf.backup file. On Ubuntu, you can find the new fuse.conf file in the /opt/mapr/conf directory and by default, there is no backup copy of the fuse.conf file from prior version unless you created one before upgrade.

Note: When hadoop common is updated along with core, a new directory is created for the new hadoop common version and the configuration files in the existing /opt/mapr/hadoop/hadoop-2.x.x directory are automatically copied into the active directory associated with the new hadoop 2.x.x directory. For example, when you upgrade from 4.1 to 5.x, configuration files that were in the hadoop-2.5.1 directory are copied into the hadoop-2.7.1 directory.

Important: If you are upgrading from 4.0.1, update scripts that point to files within the /opt/mapr/hadoop-2.4.1 directory to point to the new hadoop 2.x directory.