Viewing Host Details
You can view detailed information about each host, including:
- Name, IP address, rack ID
- Health status of the host and last time the Cloudera Manager Agent sent a heart beat to the Cloudera Manager Server
- Number of cores
- System load averages for the past 1, 5 and 15 minutes
- Memory usage
- File system disks, their mount points, and usage
- Health Test Results for the host
- Charts showing a variety of metrics and health test results over time.
- Role instances running on the host and their health
- CPU, memory, disk resources used for each role instance
To view detailed host information:
- Click the Hosts tab
- Click the name of one of the listed hosts. The Status page is displayed for the host you selected.
- Click tabs to access specific categories of information. Each tab provides various categories of information about the host, its services, components, and configuration.
From the status page you can view details about several categories of information by clicking on the following tabs:
This page is displayed when a Host is initially selected. This provides summary information about the status of the selected host. Use this page to gain a general understanding of work being done by the system, the configuration, and health status.
If this host has been decommissioned or is in maintenance mode, you will see the following icon(s) ( , ) in the top bar of the page next to the status message.
This panel provides basic system configuration such as the host's IP address, rack, health status summary, and disk and CPU resources. This information summarizes much of the detailed information provided in other panes on this tab.
- Click the link next to the Rack to set the Rack ID.
- Click the Host Agent Details link to see details about the host agent.
- You can display events related to this host by clicking the Alerts, Critical or All links next to Event Search.
Cloudera Manager monitors a variety of metrics that are used to indicate whether a host is functioning as expected. The Health Tests panel shows health test results in an expandable/collapsable list, typically with the specific metrics that the test returned. (You can Expand All or Collapse All from the links at the upper right of the Health Tests panel).
- The color of the text (and the background color of the field) for a Health Test result indicates the status of the results. The tests are sorted by their health status – Good, Concerning, Bad, or Disabled. The list of entries for good and Disabled health tests are collapsed by default; however, Bad or Concerning results are shown expanded.
- The text of a health test also acts as a link to further information about the test. Clicking the text will pop up a window with further information, such as the meaning of the test and its possible results, suggestions for actions you can take or how to make configuration changes related to the test. The help text for a health test also provides a link to the relevant monitoring configuration section for the service. See Configuring Monitoring Settings for more information.
- The small heatmap icon () to the right of some of the tests takes you to a heatmap display that lets you compare the values of the relevant test result metrics across the nodes of your cluster.
The Health History provides a record of state transitions of the Health Tests for the host.
- Click the arrow symbol at the left to view the description of the health test state change.
- Click the View link to open a new page that shows the state of the host at the time of the transition. Note that in this view some of the status settings are greyed out, as they reflect a time in the past, not the current status.
The File systems panel provides information about disks, their mount points and usage. Use this information to determine if additional disk space is required.
Use the Roles panel to see the role instances running on the selected host, as well as each instance's status and health. Host machines are configured with one or more role instances, each of which corresponds to a service. The role indicates which daemon runs on the host. Some examples of roles include the NameNode, Secondary NameNode, Balancer, JobTrackers, DataNodes, RegionServers and so on. Typically a host will run multiple roles in support of the various services running in the cluster.
Click the role name to go to the role instance's status page. Using the triangle to the right of the role name, you can directly access the tabs on the role page (such as the Processes, Commands, Configuration, or Audits tabs) as well as the status page for the parent Service of the role.
Click the Log File link to view the log file for the role instance on this system.
You can delete a role from the host from the Instances tab of the Service page for the parent service of the role. You can add a role to a host in the same way. See Adding Role Instances and Deleting a Role Instance.
Charts are shown for each host instance in your cluster.
See Viewing Charts for Service, Role, or Host Instances in the Cloudera Manager Monitoring and Diagnostics Guide for detailed information on the charts that are presented, and the ability to search and display metrics of your choice.
The processes page provides information about each of the processes that are currently running on this host. Use this page to access management web UIs, check process status, and access log information.
The Processes tab includes a variety of categories of information.
- Service — The name of the service. Clicking the service name takes you to the service status page. Using the triangle to the right of the service name, you can directly access the tabs on the role page (such as the Processes, Commands, Configuration, or Audits tabs).
- Instance — The role instance on this host that is associated with the service. Clicking the role name takes you to the role instance's status page. Using the triangle to the right of the role name, you can directly access the tabs on the role page (such as the Processes, Commands, Configuration, or Audits tabs) as well as the status page for the parent Service of the role.
- Name — The process name.
- Links — Links to relevant information about the process — typically a link to the management interface for this role instance on this system. This is not available in all cases.
- Status — The current status for the process. Statuses include stopped, starting, running, and paused.
- PID — The unique process identifier.
- Uptime — The length of time this process has been running.
- Full log file — A link to the full log for this host log entries for this host (a file external to Cloudera Manager).
- Stderr — A link to the stderr log for this host (a file external to Cloudera Manager).
- Stdout — A link to the stdout log for this host (a file external to Cloudera Manager).
Under the Resources tab you can view the resources (CPU, memory, disk, and ports) used by every service and role instance running on the selected host.
Each entry on this page lists:
- The service name
- The name of the particular instance of this service
- A brief description of the resource
- The amount of the resource being consumed or the settings for the resource
The resource information provided depends on the type of resource:
An approximate percentage of the CPU resource consumed.
The number of bytes consumed.
The disk location where this service stores information.
The port number being used by the service to establish network connections.
The Commands tab shows you running or recent commands for the host you are viewing. See Viewing Running and Recent Commands for more information.
The Configuration tab for a host lets you set properties related to parcels and to resource management, and also monitoring properties for the hosts under management.
To modify the Default configuration properties for the selected host:
- Select .
- Go to the Default category.
- Under Parcels, you can specify how parcels will interact with the selected host. You can provide a "blacklist" of products that should not be distributed to this host.
- Under Resource Management click the checkbox to enable resource management on this host. 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 Components tab lists every component installed on this host. This may include components that have been installed but have not been added as a service (such as YARN, Flume or Impala).
This includes the following information:
- Component — The name of the component.
- Version — The version of CDH from which each component came.
- Component Version — Theversion number for each component.
The Audits tab lets you filter for audit events related to this host. See Viewing the Audit History for more information.
Charts Library Tab
The Charts Library tab for a host instance provides charts for all metrics kept for that host instance, organized by category. Each category is collapsible/expandable.
These are described in detail in the Cloudera Manager Monitoring and Diagnostics Guide
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