Overview
As IT operations evolve from traditional infrastructure to cloud service models, conventional approaches face challenges such as complex service-to-service interactions, fast application iteration, large-scale operational objects, and nonlinear behaviors in complex systems. Service downtime will bring huge economic losses and reputational damage to the company.
Chaos engineering is introduced to the O&M process. Through periodic simulation, system weaknesses (such as software bugs, solution design defects, and fault recovery process points) can be identified before problems occur on the live network, and system availability problems can be detected and resolved in a timely manner, continuously improve application resilience and build O&M confidence. For unavoidable scenarios (such as hardware faults, abnormal server power-off, and network device board faults), formulate a contingency plan for quick fault rectification.
COC allows you to perform automatic chaos drills covering from risk identification, contingency plan management, fault injection, and review and improvement. Based on years of best practices of Huawei Cloud SRE in chaos drills, customers can proactively identify, mitigate, and verify risks of cloud applications, continuously improving the resilience of cloud applications.
Prerequisites
You have enabled the Fault Drills package. For details about billing, see Billing Items.
Procedure Description
Chaos drill process:
Step 1: To analyze the potential faults of an application, you can check the trigger conditions, symptoms, and impacts on customer services of a fault to establish a failure mode.
Step 2: You can plan a drill, specify an executor, and schedule the drill. Upon receiving a drill plan request, the executor can create a drill task that will be associated with a given failure mode and a region, simulating a realistic fault scenario.
Step 3: You can directly create a drill task. In the drill task list, start the chaos drill task and view the drill records.
Chaos Drill Function Introduction
Image and Disruptor Version Support Statement
Currently, a chaos drill supports targets such as Elastic Cloud Servers (ECSs), FlexusL instances, and Bare Metal Servers (BMSs), and provides corresponding resource and network disruptors for you to drill. Probe disruptors include disruptors for practicing, host resources, host processes, and host network modules. By integrating disruptor modules and functions, you can accurately simulate faults in the actual environment and identify system availability issues as early as possible, continuously improving application resilience.
The following table lists the ECSs, FlexusL, and BMSs image versions and supported probe tools.
CentOS 6.10 images and earlier versions do not support some probe disruptors because the system does not have the shared libraries (GLIBC_2.14 and GLIBCXX_3.4.15) required for running corresponding probe packages.
Table 1 lists the probe disruptors supported by each ECS image version.
| Disruptor | Supported Image Version | Description | |
|---|---|---|---|
| Disruptors for practicing | Qualifying practice | CentOS 7.2, CentOS 7.6, CentOS 7.9, CentOS 8.2, Ubuntu 16.04, Ubuntu 18.04, Ubuntu 20.04, Ubuntu 22.04, EulerOS 2.2, EulerOS 2.5, EulerOS 2.9, EulerOS 2.10, Debian 8.2.0, Debian 8.8.0, Debian 9.0.0, Debian 11.1.0, and Huawei Cloud EulerOS 2.0 | - |
| Host resources | CPU usage increase | CentOS 7.2, CentOS 7.6, CentOS 7.9, CentOS 8.2, Ubuntu 16.04, Ubuntu 18.04, Ubuntu 20.04, Ubuntu 22.04, EulerOS 2.2, EulerOS 2.5, EulerOS 2.9, EulerOS 2.10, Debian 8.2.0, Debian 8.8.0, Debian 9.0.0, Debian 11.1.0, and Huawei Cloud EulerOS 2.0 | - |
| Memory usage increase | CentOS 7.2, CentOS 7.6, CentOS 7.9, CentOS 8.2, Ubuntu 16.04, Ubuntu 18.04, Ubuntu 20.04, Ubuntu 22.04, EulerOS 2.2, EulerOS 2.5, EulerOS 2.9, EulerOS 2.10, Debian 8.2.0, Debian 8.8.0, Debian 9.0.0, Debian 11.1.0, and Huawei Cloud EulerOS 2.0 | - | |
| Disk usage increase | CentOS 7.2, CentOS 7.6, CentOS 7.9, CentOS 8.2, Ubuntu 16.04, Ubuntu 18.04, Ubuntu 20.04, Ubuntu 22.04, EulerOS 2.2, EulerOS 2.5, EulerOS 2.9, EulerOS 2.10, Debian 8.2.0, Debian 8.8.0, Debian 9.0.0, Debian 11.1.0, and Huawei Cloud EulerOS 2.0 | - | |
| Disk I/O pressure increase | CentOS 7.2, CentOS 7.6, CentOS 7.9, CentOS 8.2, Ubuntu 16.04, Ubuntu 18.04, Ubuntu 20.04, Ubuntu 22.04, EulerOS 2.2, EulerOS 2.5, EulerOS 2.9, EulerOS 2.10, Debian 8.2.0, Debian 8.8.0, Debian 9.0.0, Debian 11.1.0, and Huawei Cloud EulerOS 2.0 | - | |
| Host process | Process ID exhaustion | CentOS 7.2, CentOS 7.6, CentOS 7.9, CentOS 8.2, Ubuntu 16.04, Ubuntu 18.04, Ubuntu 20.04, Ubuntu 22.04, EulerOS 2.2, EulerOS 2.5, EulerOS 2.9, EulerOS 2.10, Debian 8.2.0, Debian 8.8.0, Debian 9.0.0, Debian 11.1.0, and Huawei Cloud EulerOS 2.0 | The process IDs of the EulerOS image are used up. The protection mechanism may be triggered, causing the kernel to restart. As a result, the drill fails. |
| Killing a process/Continuously killing a process | CentOS 7.2, CentOS 7.6, CentOS 7.9, CentOS 8.2, Ubuntu 16.04, Ubuntu 18.04, Ubuntu 20.04, Ubuntu 22.04, EulerOS 2.2, EulerOS 2.5, EulerOS 2.9, EulerOS 2.10, Debian 8.2.0, Debian 8.8.0, Debian 9.0.0, Debian 11.1.0, and Huawei Cloud EulerOS 2.0 | - | |
| Host network | Network latency | CentOS 7.2, CentOS 7.6, CentOS 7.9, Ubuntu 16.04, Ubuntu 18.04, Ubuntu 20.04, Ubuntu 22.04, EulerOS 2.2, EulerOS 2.5, EulerOS 2.9, EulerOS 2.10, Debian 8.2.0, Debian 8.8.0, Debian 9.0.0, Debian 11.1.0, and Huawei Cloud EulerOS 2.0 | - |
| Network packet loss | CentOS 7.2, CentOS 7.6, CentOS 7.9, Ubuntu 16.04, Ubuntu 18.04, Ubuntu 20.04, Ubuntu 22.04, EulerOS 2.2, EulerOS 2.5, EulerOS 2.9, EulerOS 2.10, Debian 8.2.0, Debian 8.8.0, Debian 9.0.0, Debian 11.1.0, and Huawei Cloud EulerOS 2.0 | - | |
| Network error packets | CentOS 7.2, CentOS 7.6, CentOS 7.9, Ubuntu 16.04, Ubuntu 18.04, Ubuntu 20.04, Ubuntu 22.04, EulerOS 2.2, EulerOS 2.5, EulerOS 2.9, EulerOS 2.10, Debian 8.2.0, Debian 8.8.0, Debian 9.0.0, Debian 11.1.0, and Huawei Cloud EulerOS 2.0 | - | |
| Duplicate packets | CentOS 7.2, CentOS 7.6, CentOS 7.9, Ubuntu 16.04, Ubuntu 18.04, Ubuntu 20.04, Ubuntu 22.04, EulerOS 2.2, EulerOS 2.5, EulerOS 2.9, EulerOS 2.10, Debian 8.2.0, Debian 8.8.0, Debian 9.0.0, Debian 11.1.0, and Huawei Cloud EulerOS 2.0 | - | |
| Network packet disorder | CentOS 7.2, CentOS 7.6, CentOS 7.9, Ubuntu 16.04, Ubuntu 18.04, Ubuntu 20.04, Ubuntu 22.04, EulerOS 2.2, EulerOS 2.5, EulerOS 2.9, EulerOS 2.10, Debian 8.2.0, Debian 8.8.0, Debian 9.0.0, Debian 11.1.0, and Huawei Cloud EulerOS 2.0 | - | |
| Network disconnection | CentOS 7.2, CentOS 7.6, CentOS 7.9, CentOS 8.2, Ubuntu 16.04, Ubuntu 18.04, Ubuntu 20.04, Ubuntu 22.04, EulerOS 2.2, EulerOS 2.5, EulerOS 2.9, EulerOS 2.10, Debian 8.2.0, Debian 8.8.0, Debian 9.0.0, Debian 11.1.0, and Huawei Cloud EulerOS 2.0 | - | |
| NIC break-down | CentOS 7.2, CentOS 7.6, CentOS 7.9, CentOS 8.2, Ubuntu 16.04, Ubuntu 18.04, Ubuntu 20.04, Ubuntu 22.04, EulerOS 2.2, EulerOS 2.5, EulerOS 2.9, EulerOS 2.10, Debian 8.2.0, Debian 8.8.0, Debian 9.0.0, Debian 11.1.0, and Huawei Cloud EulerOS 2.0 | If the NIC becomes faulty, UniAgent may go offline. As a result, UniAgent information cannot be received, and the page fails to be displayed. | |
| DNS tempering | CentOS 7.2, CentOS 7.6, CentOS 7.9, CentOS 8.2, Ubuntu 16.04, Ubuntu 18.04, Ubuntu 20.04, Ubuntu 22.04, EulerOS 2.2, EulerOS 2.5, EulerOS 2.9, EulerOS 2.10, Debian 8.2.0, Debian 8.8.0, Debian 9.0.0, Debian 11.1.0, and Huawei Cloud EulerOS 2.0 | - | |
| Port occupation | CentOS 7.2, CentOS 7.6, CentOS 7.9, CentOS 8.2, Ubuntu 16.04, Ubuntu 18.04, Ubuntu 20.04, Ubuntu 22.04, EulerOS 2.2, EulerOS 2.5, EulerOS 2.9, EulerOS 2.10, Debian 8.2.0, Debian 8.8.0, Debian 9.0.0, Debian 11.1.0, and Huawei Cloud EulerOS 2.0 | - | |
| Server disconnection | CentOS 7.2, CentOS 7.6, CentOS 7.9, CentOS 8.2, Ubuntu 16.04, Ubuntu 18.04, Ubuntu 20.04, Ubuntu 22.04, EulerOS 2.2, EulerOS 2.5, EulerOS 2.9, EulerOS 2.10, Debian 8.2.0, Debian 8.8.0, Debian 9.0.0, Debian 11.1.0, and Huawei Cloud EulerOS 2.0 | If the server becomes faulty, UniAgent may go offline. As a result, UniAgent information cannot be received, and the page fails to be displayed. | |
| NIC bandwidth limiting | CentOS 7.2, CentOS 7.6, CentOS 7.9, Ubuntu 16.04, Ubuntu 18.04, Ubuntu 20.04, Ubuntu 22.04, EulerOS 2.2, EulerOS 2.5, EulerOS 2.9, EulerOS 2.10, Debian 8.2.0, Debian 8.8.0, Debian 9.0.0, Debian 11.1.0, and Huawei Cloud EulerOS 2.0 | - | |
| Connection exhaustion | CentOS 7.2, CentOS 7.6, CentOS 7.9, CentOS 8.2, Ubuntu 16.04, Ubuntu 18.04, Ubuntu 20.04, Ubuntu 22.04, EulerOS 2.2, EulerOS 2.5, EulerOS 2.9, EulerOS 2.10, Debian 8.2.0, Debian 8.8.0, Debian 9.0.0, Debian 11.1.0, and Huawei Cloud EulerOS 2.0 | - | |
Table 2 lists the probe disruptors supported by each BMS image version.
| Disruptor | Supported Image Version | |
|---|---|---|
| Disruptors for practicing | Qualifying practice | CentOS 7.3, CentOS 7.9, Ubuntu 16.04, Ubuntu 18.04, and EulerOS 2.3 |
| Host resources | CPU usage increase | CentOS 7.3, CentOS 7.9, Ubuntu 16.04, Ubuntu 18.04, and EulerOS 2.3 |
| Memory usage increase | CentOS 7.3, CentOS 7.9, Ubuntu 16.04, Ubuntu 18.04, and EulerOS 2.3 | |
| Disk usage increase | CentOS 7.3, CentOS 7.9, Ubuntu 16.04, Ubuntu 18.04, and EulerOS 2.3 | |
| Disk I/O pressure increase | CentOS 7.3, CentOS 7.9, Ubuntu 16.04, Ubuntu 18.04, and EulerOS 2.3 | |
| Host process | Process ID exhaustion | CentOS 7.3, CentOS 7.9, Ubuntu 16.04, Ubuntu 18.04, and EulerOS 2.3 |
| Killing a process/Continuously killing a process | CentOS 7.4, CentOS 7.9, Ubuntu 16.04, Ubuntu 18.04, and EulerOS 2.3 | |
| Host network | Network latency | CentOS 7.3, CentOS 7.9, Ubuntu 16.04, Ubuntu 18.04, and EulerOS 2.3 |
| Network packet loss | CentOS 7.3, CentOS 7.9, Ubuntu 16.04, Ubuntu 18.04, and EulerOS 2.3 | |
| Network error packets | CentOS 7.3, CentOS 7.9, Ubuntu 16.04, Ubuntu 18.04, and EulerOS 2.3 | |
| Duplicate packets | CentOS 7.3, CentOS 7.9, Ubuntu 16.04, Ubuntu 18.04, and EulerOS 2.3 | |
| Network packet disorder | CentOS 7.3, CentOS 7.9, Ubuntu 16.04, Ubuntu 18.04, and EulerOS 2.3 | |
| Network disconnection | CentOS 7.3, CentOS 7.9, Ubuntu 16.04, Ubuntu 18.04, and EulerOS 2.3 | |
| NIC break-down | CentOS 7.3, CentOS 7.9, Ubuntu 16.04, Ubuntu 18.04, and EulerOS 2.3 | |
| DNS tempering | CentOS 6.9, CentOS 7.9, Ubuntu 16.04, Ubuntu 18.04, EulerOS 2.3, and EulerOS 2.9 | |
| Port occupation | CentOS 6.9, CentOS 7.9, Ubuntu 16.04, Ubuntu 18.04, EulerOS 2.3, and EulerOS 2.9 | |
| Server disconnection | CentOS 6.9, CentOS 7.9, Ubuntu 16.04, Ubuntu 18.04, EulerOS 2.3, and EulerOS 2.9 | |
| NIC bandwidth limiting | CentOS 6.9, CentOS 7.4, CentOS 7.9, Ubuntu 16.04, Ubuntu 18.04, EulerOS 2.3, and EulerOS 2.9 | |
| Connection exhaustion | CentOS 7.4, CentOS 7.9, Ubuntu 16.04, Ubuntu 18.04, EulerOS 2.3, and EulerOS 2.9 | |
Table 3 lists the probe disruptors supported by each FlexusL image.
| Disruptor | Supported Image Version | |
|---|---|---|
| Disruptors for practicing | Qualifying practice | CentOS 7.2, CentOS 8.2, Ubuntu 16.04, Ubuntu 22.04, EulerOS 2.0, Debian 8.2, and Debian 11.1.0 |
| Host resources | CPU usage increase | CentOS 7.2, CentOS 8.2, Ubuntu 16.04, Ubuntu 22.04, EulerOS 2.0, Debian 8.2, and Debian 11.1.0 |
| Memory usage increase | CentOS 7.2, CentOS 8.2, Ubuntu 16.04, Ubuntu 22.04, EulerOS 2.0, Debian 8.2, and Debian 11.1.0 | |
| Disk usage increase | CentOS 7.2, CentOS 8.2, Ubuntu 16.04, Ubuntu 22.04, EulerOS 2.0, Debian 8.2, and Debian 11.1.0 | |
| Disk I/O pressure increase | CentOS 7.2, CentOS 8.2, Ubuntu 16.04, Ubuntu 22.04, EulerOS 2.0, Debian 8.2, and Debian 11.1.0 | |
| Host process | Process ID exhaustion | CentOS 7.2, CentOS 8.2, Ubuntu 16.04, Ubuntu 22.04, EulerOS 2.0, Debian 8.2, and Debian 11.1.0 |
| Killing a process/Continuously killing a process | CentOS 7.2, CentOS 8.2, Ubuntu 16.04, Ubuntu 22.04, EulerOS 2.0, Debian 8.2, and Debian 11.1.0 | |
| Host network | Network latency | CentOS 7.2, Ubuntu 16.04, Ubuntu 22.04, EulerOS 2.0, Debian 8.2, and Debian 11.1.0 |
| Network packet loss | CentOS 7.2, Ubuntu 16.04, Ubuntu 22.04, EulerOS 2.0, Debian 8.2, and Debian 11.1.0 | |
| Network error packets | CentOS 7.2, Ubuntu 16.04, Ubuntu 22.04, EulerOS 2.0, Debian 8.2, and Debian 11.1.0 | |
| Duplicate packets | CentOS 7.2, Ubuntu 16.04, Ubuntu 22.04, EulerOS 2.0, Debian 8.2, and Debian 11.1.0 | |
| Network packet disorder | CentOS 7.2, Ubuntu 16.04, Ubuntu 22.04, EulerOS 2.0, Debian 8.2, and Debian 11.1.0 | |
| Network disconnection | CentOS 7.2, CentOS 8.2, Ubuntu 16.04, Ubuntu 22.04, EulerOS 2.0, Debian 8.2, and Debian 11.1.0 | |
| NIC break-down | CentOS 7.2, CentOS 8.2, Ubuntu 16.04, Ubuntu 22.04, EulerOS 2.0, Debian 8.2, and Debian 11.1.0 | |
| DNS tempering | CentOS 7.2, CentOS 8.2, Ubuntu 16.04, Ubuntu 22.04, EulerOS 2.0, Debian 8.2, and Debian 11.1.0 | |
| Port occupation | CentOS 7.2, CentOS 8.2, Ubuntu 16.04, Ubuntu 22.04, EulerOS 2.0, Debian 8.2, and Debian 11.1.0 | |
| Server disconnection | CentOS 7.2, CentOS 8.2, Ubuntu 16.04, Ubuntu 22.04, EulerOS 2.0, Debian 8.2, and Debian 11.1.0 | |
| NIC bandwidth limiting | CentOS 7.2, Ubuntu 16.04, Ubuntu 22.04, EulerOS 2.0, Debian 8.2, and Debian 11.1.0 | |
| Connection exhaustion | CentOS 7.2, CentOS 8.2, Ubuntu 16.04, Ubuntu 22.04, EulerOS 2.0, Debian 8.2, and Debian 11.1.0 | |
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