Simulate Process Faults

This document describes how to use Chaosd to simulate process faults. The process faults use the Golang interface of the kill command to simulate the scenarios that the process is killed or stopped. You can create experiments either in the command-line mode or service mode.

Before creating an experiment, you can run the following command to see the process fault types that are supported by Chaosd:

chaosd attack process -h

Currently, Chaosd supports simulating that a process is killed or stopped.

To create experiments using the service mode, you need to run Chaosd in the service mode and then send a POST HTTP request to the /api/attack/process path of the Chaosd service:

chaosd server --port 31767

curl -X POST 172.16.112.130:31767/api/attack/process -H "Content-Type:application/json" -d '{fault-configuration}'

For the fault-configuration part in the above command, you need to configure it according to the fault types. For the corresponding parameters and examples, refer to the parameters of each fault type in the following sections.

info

When running an experiment, remember to record the UID of the experiment. When you want to end the experiment corresponding to the UID, you need to send a DELETE HTTP request to the /api/attack/{uid} path of the Chaosd service.

Kill a process

Parameters for killing a process

Configuration item	Abbreviation	Service mode field	Description	Type	Value
process	p	process	The name or the identifier of the process into which faults are injected	string	The default value is "".
recover-cmd	r	recover-cmd	The command to be run when recovering experiment	string	The default value is "".
signal	s	signal	The provided value of the process signal	int	The default value is 9. Currently, only SIGKILL, SIGTERM, and SIGSTOP are supported.

Simulate killing a process using the command-line mode

chaosd attack process kill -h

An example is as follows:

chaosd attack process kill -p python

info

Only the experiments whose signal is SIGSTOP or that configure recover-cmd can be recovered.

Simulate killing a process using the service mode

An example is as follows:

curl -X POST 172.16.112.130:31767/api/attack/process -H "Content-Type:application/json" -d '{"process":"12345","signal":15}'

Stop a process

Parameters for stopping a process

Configuration item	Abbreviation	Service mode field	Description	Type	Value
process	p	process	The name or the identifier of the process to be stopped	string	The default value is "".
signal	—	signal	The provided value of the process signal	int	The default value is 9.

Simulate stopping a process using the command-line mode

chaosd attack process stop -h

An example is as follows:

chaosd attack process stop -p python

Simulate stopping a process using the service mode

An example is as follows:

curl -X POST 172.16.112.130:31767/api/attack/process -H "Content-Type:application/json" -d '{"process":"12345","signal":19}'

info

Only the experiments whose signal is SIGSTOP or that configure recover-cmd can be recovered.