6. Confirm Hosts

Confirm Hosts prompts you to confirm that Ambari has located the correct hosts for your cluster and to check those hosts to make sure they have the correct directories, packages, and processes required to continue the install.

If any hosts were selected in error, you can remove them by selecting the appropriate checkboxes and clicking the grey Remove Selected button. To remove a single host, click the small white Remove button in the Action column.

At the bottom of the screen, you may notice a yellow box that indicates some warnings were encountered during the check process. For example, your host may have already had a copy of wget or curl. Choose Click here to see the warnings to see a list of what was checked and what caused the warning. The warnings page also provides access to a python script that can help you clear any issues you may encounter and let you run Rerun Checks.

Note

If you are deploying HDP using Ambari 1.4 or later on RHEL 6.5 you will likely see Ambari Agents fail to register with Ambari Server during the Confirm Hosts step in the Cluster Install wizard. Click the Failed link on the Wizard page to display the Agent logs. The following log entry indicates the SSL connection between the Agent and Server failed during registration: INFO 2014-04-02 04:25:22,669 NetUtil.py:55 - Failed to connect to https://<ambari-server>:8440/cert/ca due to [Errno 1] _ssl.c:492: error:100AE081:elliptic curve routines:EC_GROUP_new_by_curve_name:unknown group

For more information about this issue, see the Ambari Troubleshooting Guide.

When you are satisfied with the list of hosts, choose Next.