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Getting Contrail Node Status

 

Overview

This topic describes how to view the status of a Contrail node on a physical server. Contrail nodes include config, control, analytics, compute, and so on.

UVE for NodeStatus

The User-Visible Entity (UVE) mechanism is used to aggregate and send the status information. All node types send a NodeStatus structure in their respective node UVEs. The following is a control node UVE of NodeStatus:

Node Status Features

The most important features of NodeStatus include:

ProcessStatus

ProcessInfo

ProcessStatus

Also process_status, is sent by the processes corresponding to the virtual node, and displays the status of the process and an aggregate state indicating if the process is functional or non-functional. The process_status includes the state of the process connections (ConnectionInfo) to important services and other information necessary for the process to be functional. Each process sends its NodeStatus information, which is aggregated as union (aggtype="union") at the analytics node. The following is the ProcessStatus structure:

ProcessInfo

Sent by the node manager, /usr/bin/contrail-nodemgr. Node manager is a monitor process per contrail virtual node that tracks the running state of the processes. The following is the ProcessInfo structure:

Example: NodeStatus

The following is an example output of NodeStatus obtained from the Rest API:

Using Introspect to Get Process Status

The user can also view the state of a specific process by using the introspect mechanism.

Example: Introspect of NodeStatus

The following is an example of the process state of contrail-control that is obtained by using

http://server-ip:8083/Snh_SandeshUVECacheReq?x=NodeStatus

Note

The example output is the ProcessStatus of only one process of contrail-control. It does not show the full aggregated status of the control node through its UVE (as in the previous example).

contrail-status script

The contrail-status script is used to give the status of the Contrail processes on a server.

The contrail-status script first checks if a process is running, and if it is, performs introspect into the process to get its functionality status, then outputs the aggregate status.

The possible states to display include:

  • active - the process is running and functional; the internal state is good

  • inactive - not started or stopped by user

  • failed – the process exited too quickly and has not restarted

  • initializing - the process is running, but the internal state is not yet functional.

Example Output: Contrail-Status Script

The following is an example output from the contrail-status script.