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This article mainly introduces "what are the methods of Linux testing resource agent". In the daily operation, I believe that many people have doubts about the method of Linux testing resource agent. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the doubts of "what are the methods of Linux testing resource agent?" Next, please follow the editor to study!

10 Test Resource Agent

This chapter discusses automated testing of resource agents. Testing is a very critical issue in development, and it is very important to develop new resource agents and modify existing resource agents.

10.1 testing with ocf_tester

The resource agent repository (including all resource agent packages) has an application called ocf_tester. This script can be easily used to test your resource agent.

Ocf_tester is usually called as the root user, like this:

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Ocf-tester-n [- o =...]

Is an arbitrary resource name

You can set any parameter you want with the-o option.

Is the full path of your resource agent

When called, the ocf-tester performs all mandatory operations (see Chapter 5 Resource Agent behavior)

You can also test optional actions. The optional action must conform to its declared behavior, and if it is not implemented, ocf-tester will mark an error flag.

Important:

Ocf-tester does not support the "dry run" of operations, nor does it produce any resource replicas. It runs the same as the actual resource agent, regardless of whether it opens and closes the database, mounts the file system, starts or stops the virtual machine, and so on. So, be careful.

For example, you can run to use ocf-tester on the foobar resource agent, as follows:

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# ocf-tester-n foobartest\

-o superfrobnicate=true\

-o datadir=/tmp\

/ home/johndoe/ra-dev/foobar

Beginning tests for / home/johndoe/ra-dev/foobar...

* Your agent does not support the notify action (optional)

* Your agent does not support the reload action (optional)

/ home/johndoe/ra-dev/foobar passed all tests

10.2 testing with ocft

Ocft is also a resource agent testing tool. Unlike ocf-tester, ocft can automatically generate complex test environments, including package installation and arbitrary shell scripts.

10.2.1 ocft components

Ocft contains the following components:

A test case generator (/ usr/sbin/ocf)-generate shell scripts from the test case configuration file

Configuration file (/ usr/share/resource-agents/ocft/configs)-A configuration file that contains environment variable settings and a resource agent profile

Test scripts are saved in / var/lib/resource-agents/ocft/cases/, but usually don't need to worry about them

10.2.2 Custom Test Environment

Ocft modifies the runtime environment of the resource agent, either by changing the environment variable (using the interface defined by OCF) or by running an ad-hoc shell script that can change permissions or unmount a file system.

10.2.3 how to test

You must understand the software you want to test, draw a sketch of all interested run scenarios, and mark all expected and unexpected conditions and the results that the resource agent should run. Then, you need to code these conditions and expected run results into ocft test columns. This makes it easy to run ocft:

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# ocft make

# ocft test

The first command generates a test case script, and the second command runs the resulting script and checks the output.

10.2.4 ocf profile syntax

There are four first-level selections, and there are one or more sub-options under each level-1 option

CONFIG (first-tier option)

This option is global and affects every test case

AgentRoot (suboption)

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AgentRoot / usr/lib/ocf/resource.d/xxx

Normally, we assume that the resource proxy script exists in the directory of the heartbeat provider. Use AgentRoot to test whether the agent is distributed in a different directory.

InstallPackage (suboption)

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InstallPackage package [package2 [...]]

Test the package you need, and if the package is already installed, it will no longer be installed.

HangTimeout (suboption)

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HangTimeout secs

The maximum execution time for running a resource agent operation, after which the operation is deemed to be invalid.

SETUP-AGENT (first-tier option)

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SETUP-AGENT

Bash commands

If the resource agent needs to be initialized before testing, you can place the bash code here. Initialization is completed only once. If you need to initialize again, you can delete the / tmp/. [agent _ NAME] _ set tag file.

CASE (first-tier option)

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CASE "description"

This is the main building block of the test suite. Each test column can be described in a CASE option. A use case consists of if suboptions followed by the RunAgent suboption.

Var (suboption)

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Var VARIABLE=value

This is to set the environment variable for the resource agent. Usually displayed as OCF_RESKEY_xxx, note that there are no spaces around the assignment symbol "=".

Unvar (suboption)

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Unvar VARIABLE [VARIABLE2 [...]]

Remove an environment variable

Include (suboption)

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Include macro_name

Contains the macro macro_name. Refer to CASE-BLOCK below.

Bash (suboption)

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Bash bash_codes

This option sets the operating system environment variable, and you can insert BASH code to customize the system environment. Be careful not to cause unrecoverable results.

BashAtExit (suboption)

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BashAtExit bash_codes

This option restores the operating system environment so that the new test case runs correctly. Of course, you can also use the Bash option directly to restore. However, if an error occurs in the process, the script says to exit without running the recovered code, in which case you should use BashAtExit, and you can restore the system environment before exiting.

RunAgent (suboption)

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RunAgent cmd [ret_value]

This option runs the resource agent. "cmd" is the parameter of the resource agent, such as "start,status,stop...". The second parameter is optional. Can be used to compare the return and expected values of the results of running the script. If not, you should be able to find some bug.

It can also be executed remotely rather than locally. The protocol used is ssh, and the program runs in the background. You just need to add @ after the suboption. As follows:

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Bash@192.168.1.100 date

The above example runs the date program. Remote commands are run in the background.

NB: these still need to be explained.

CASE-BLOCK (first-tier option)

The CASE-BLOCK option defines macros that can be included in the CASE. All suboptions of CASE are available.

At this point, the study on "what are the methods of Linux testing resource agent" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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