模拟压力场景

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本文档介绍如何使用 Chaosd 模拟压力场景。该功能通过 stress-ng 在主机上生成 CPU 或内存压力。您可以通过命令行模式或服务模式创建压力实验。

通过命令行模式创建压力实验

本节介绍如何通过命令行模式创建压力实验。

创建压力实验前，可运行以下命令查看 Chaosd 支持的压力实验类型：

chaosd attack stress --help

结果如下：

Stress attack related commands

Usage:
  chaosd attack stress [command]

Available Commands:
  cpu         continuously stress CPU out
  mem         continuously stress virtual memory out

Flags:
  -h, --help   help for stress

Global Flags:
      --log-level string   the log level of chaosd, the value can be 'debug', 'info', 'warn' and 'error'

Use "chaosd attack stress [command] --help" for more information about a command.

当前 Chaosd 支持创建 CPU 压力实验和内存压力实验。

通过命令行模式模拟 CPU 压力

模拟 CPU 压力的命令

查看 CPU 压力模拟支持的配置项，请运行：

chaosd attack stress cpu --help

结果如下：

continuously stress CPU out

Usage:
  chaosd attack stress cpu [options] [flags]

Flags:
  -h, --help              help for cpu
  -l, --load int          Load specifies P percent loading per CPU worker. 0 is effectively a sleep (no load) and 100 is full loading. (default 10)
  -o, --options strings   extend stress-ng options.
  -w, --workers int       Workers specifies N workers to apply the stressor. (default 1)

Global Flags:
      --log-level string   the log level of chaosd, the value can be 'debug', 'info', 'warn' and 'error'

模拟 CPU 压力的配置说明

Configuration item	Abbreviation	Description	Type	Value
load	l	Specifies the percentage of CPU load per CPU worker. 0 means no CPU utilization, and 100 means full CPU utilization.	int	Range: 0 to 100; Default value: 10.
workers	w	Specifies the number of workers used to create CPU stress.	int	Default value: 1.
options	o	The extended parameter of stress-ng, usually not configured.	string	Default value: "".

模拟 CPU 压力的示例

chaosd attack stress cpu --workers 2 --load 10

结果如下：

[2021/05/12 03:38:33.698 +00:00] [INFO] [stress.go:66] ["stressors normalize"] [arguments=" --cpu 2 --cpu-load 10"]
[2021/05/12 03:38:33.702 +00:00] [INFO] [stress.go:82] ["Start stress-ng process successfully"] [command="/usr/bin/stress-ng --cpu 2 --cpu-load 10"] [Pid=27483]
Attack stress cpu successfully, uid: 4f33b2d4-aee6-43ca-9c43-0f12867e5c9c

通过命令行模式模拟内存压力

模拟内存压力的命令

查看内存压力模拟支持的配置项，请运行：

chaosd attack stress mem --help

结果如下：

continuously stress virtual memory out

Usage:
  chaosd attack stress mem [options] [flags]

Flags:
  -h, --help              help for mem
  -o, --options strings   extend stress-ng options.
  -s, --size string       Size specifies N bytes consumed per vm worker, default is the total available memory. One can specify the size as % of total available memory or in units of B, KB/KiB, MB/MiB, GB/GiB, TB/TiB..

Global Flags:
      --log-level string   the log level of chaosd, the value can be 'debug', 'info', 'warn' and 'error'

模拟内存压力的配置说明

Configuration item	Abbreviation	Description	Type	Value
size	s	Specifies the size of memory per VM worker.	string	The memory size in B, KB/KiB, MB/MiB, GB/GiB, TB/TiB. If the size is not set, all available memory is used by default.
options	o	The extended parameter of stress-ng, usually not configured.	string	Default value: "".

模拟内存压力的示例

chaosd attack stress mem --workers 2 --size 100M

结果如下：

[2021/05/12 03:37:19.643 +00:00] [INFO] [stress.go:66] ["stressors normalize"] [arguments=" --vm 2 --vm-keep --vm-bytes 100000000"]
[2021/05/12 03:37:19.654 +00:00] [INFO] [stress.go:82] ["Start stress-ng process successfully"] [command="/usr/bin/stress-ng --vm 2 --vm-keep --vm-bytes 100000000"] [Pid=26799]
Attack stress mem successfully, uid: c2bff2f5-3aac-4ace-b7a6-322946ae6f13

运行实验时需保存实验的 uid 信息。当不需要压力模拟时，可通过 recover 终止对应 uid 的实验：：

chaosd recover c2bff2f5-3aac-4ace-b7a6-322946ae6f13

结果如下：

Recover c2bff2f5-3aac-4ace-b7a6-322946ae6f13 successfully

通过服务模式创建压力实验

要通过服务模式创建实验，请按以下步骤操作：

1. 在服务模式下运行 Chaosd：

   chaosd server --port 31767

2. 向 Chaosd 服务的 /api/attack/{uid} 路径发送 POST HTTP 请求：

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

   上述命令中的 fault-configuration 部分需根据故障类型配置，具体参数请参考后续章节中各故障类型的参数说明及示例。

备注

运行实验时，请务必保存实验的 UID 信息。当需要终止对应 UID 的实验时，需向 Chaosd 服务的 /api/attack/{uid} 路径发送 DELETE HTTP 请求。

通过服务模式模拟 CPU 压力

模拟 CPU 压力的参数

Parameter	Description	Type	Value
action	Actions of the experiment		Set to "cpu"
load	Specifies the percentage of CPU load per CPU worker. 0 means no CPU utilization, and 100 means full CPU utilization.	int	Range: 0 to 100; Default value: 10
workers	Specifies the number of workers used to create CPU stress	int	Default value: 1
options	The extended parameter of stress-ng, usually not configured.	string	Default value: ""

通过服务模式模拟 CPU 压力的示例

curl -X POST 172.16.112.130:31767/api/attack/stress -H "Content-Type:application/json" -d '{"load":10, "action":"cpu","workers":1}'

结果如下：

{"status":200,"message":"attack successfully","uid":"c3c519bf-819a-4a7b-97fb-e3d0814481fa"}

通过服务模式模拟内存压力

模拟内存压力的参数

Parameter	Description	Type	Value
action	Actions of the experiment		Set to "mem"
size	Specifies the size of memory per VM worker	string	the memory size in B, KB/KiB, MB/MiB, GB/GiB, TB/TiB. If the size is not set, all available memory is used by default.
options	The extended parameter of stress-ng, usually not configured.	string	Default value: ""

通过服务模式模拟内存压力的示例

curl -X POST 172.16.112.130:31767/api/attack/stress -H "Content-Type:application/json" -d '{"size":"100M", "action":"mem"}'

结果如下：

{"status":200,"message":"attack successfully","uid":"a551206c-960d-4ac5-9056-518e512d4d0d"}