This is the documentation for Cloudera Manager 4.8.3.
Documentation for other versions is available at Cloudera Documentation.

Managing and Configuring Cluster Hosts

Cloudera Manager provides a number of features that let you configure and manage the hosts in your clusters.

The All Hosts Status Page

The Status tab of the All Hosts page shows summary information about the hosts under management by Cloudera Manager, and is displayed when the All Hosts list is initially selected.

The list of hosts shows the overall status of the Cloudera Manager-managed hosts in your cluster. The information provided includes the version of CDH running on the host, the cluster to which the host belongs, and the number of roles running on the host.

  • Clicking the small arrow in front of the number of roles will list all the role instances running on that host. The balloon annotation that appears when you move the cursor over a link indicates the service instance to which the role belongs.
  • All columns in the table can be filtered either by typing text or by selecting a filter specification from the drop-down list in the filter field.
  • You can change the data you see for the hosts in the host list using the View Columns menu:
    • Current States shows you basic information (Host name, IP, rack assignment, CDH version, health status, when the Last Heartbeat occurred, and the Decommission status.)
    • Physical Attributes shows you physical information about the host such as the number of cores, system load averages for the past 1, 5 and 15 minutes, disk usage, physical memory and swap space usage.

Under the Actions for Selected menu you can manage rack locality by assigning hosts to racks, delete hosts, decommission and recommission hosts, start all roles on the host, and enter or exit maintenance mode. You can also apply a Host Template to a host, if that host does not have any roles currently running on it.

You can also Add New Hosts to Cluster, run the Host Inspector, and Re-run Host Upgrade Wizard from this page.

You can change the data you see for the hosts in the host list using the View Columns menu:

  • Current States shows you basic information (Host name, IP, Rack assignment, CDH version, Health status, Last heartbeat, Maintenance Mode status, and Decommission status.)
  • Physical Attributes shows you physical information about the host such as the number of cores, system load averages for the past 1, 5 and 15 minutes, disk usage, physical memory and swap space usage.

Viewing Individual Hosts

You can view detailed information about an individual host — resources (CPU/memory/storage) used and available, which processes they are running, details about the host agent, and much more — by clicking on the individual host. See Viewing Host Details.

The Configuration Tab

The Host Configuration tab lets you set properties related to parcels and to resource management, and also monitoring properties for the hosts under management. Note that configuration settings you make here will affect all your managed hosts. You can also configure properties for individual hosts from the Host Details page (see Viewing Host Details) which will override the global properties set here).

To edit the Default configuration properties for your hosts:

  1. Select Configuration > View and Edit.
  • Under Parcels, you can specify how parcels will interact with your managed hosts. You can provide a "blacklist" of products that should not be distributed to these hosts. Blacklisting a product at the All Hosts level will prevent the product from being distributed to any of the managed hosts in your cluster. You can also blacklist products at the individual host level.
  • Under Resource Management click the checkbox to enable resource management. If this is enabled, then CPU shares and memory limits can be configured through the appropriate role groups.

For a discussion of the monitoring properties for hosts, see Host Details in the Cloudera Manager Monitoring and Diagnostics Guide.

For more information on making configuration changes, see Modifying Configuration Settings.

The Templates Tab

The Templates tab lets you create and manage Host Templates, which provide a way to specify a set of role configurations that should be applied to a host. This greatly simplifies the process of adding new hosts, because it lets you specify the configuration for multiple roles on a host in a single step, and then (optionally) start all those roles. See Working with Host Templates for more information.

The Parcels Tab

Here you can download, distribute, and activate an available parcel to your cluster. You can use parcels to add new products to your cluster, or to upgrade products you already have installed. For more information, see Upgrading Using Parcels.

Other Host Configuration Tasks