tencent cloud

All product documents
Tencent Smart Advisor
DocumentationTencent Smart AdvisorOperation GuideOperation Guide to TSA - Chaotic Fault GeneratorFault Action LibraryComputeCVM DNS Unavailability Experiment
CVM DNS Unavailability Experiment
Download PDF
Last updated: 2025-03-24 15:22:59
CVM DNS Unavailability Experiment
Last updated: 2025-03-24 15:22:59
Download PDF

Background

Cloud Virtual Machine (CVM), launched by Tencent Cloud, has been increasingly widely used. When a CVM is used, the IP address of a server can be quickly located through a Domain Name System (DNS) to allow easy access by users. The complexity introduced by cloud computing architecture also brings forth new stability issues. However, the importance of DNS in the Internet world has long been ignored. Due to malicious DNS pollution, hijacking, and lack of high availability and scalability, DNS has become a popular object of attack. To ensure the continuity and security of businesses of users, the CVM DNS chaos engineering experiment emerges.

Experiment Execution

Step 1: Experiment Preparation

Prepare a CVM instance object for the experiment.

Step 2: Experiment Orchestration

1. Log in to the Tencent Cloud Smart Advisor > Chaotic Fault Generator, go to the Experiment Management page, and click Create a New Experiment.
2. Click Skip and create a blank experiment.
3. Fill in the experiment information, and switch the default region to another region as needed. After filling in the basic information, click Next.
4. Input action information, select Compute -CVM for Object Type, click Add Instance, and select a CVM instance for Experiment Objective.
5. Click Add Now to add an experiment action, select Network Resources, click DNS unavailable, and click Next.
6. Configure fault action parameters. Domain name allowlist parameters are supported, indicating a list of domain names available for parsing during a DNS fault. Multiple domain names are separated with English semicolons. Click Confirm.
7. After the configuration of parameters is completed, click Next.
8. Click Submit to create an experiment.

Step 3: Experiment Execution

1. Verify DNS parsing before a fault. Test domain name parsing through nslookup commands.
2. Go to the Action Group 1, click Execute in the Fault Card, and inject a fault.
3. After a successful fault injection, check CVM DNS parsing through nslookup.
4. Click Execute in the Recovery Action Card to recover DNS.
5. After a successful recovery, observe CVM DNS parsing again. You will find that DNS has returned to normal.


Was this page helpful?
You can also Contact Sales or Submit a Ticket for help.
Yes
No

Feedback

Contact Us

Contact our sales team or business advisors to help your business.

Contact Us
Technical Support

Open a ticket if you're looking for further assistance. Our Ticket is 7x24 avaliable.

Submit a Ticket
7x24 Phone Support
Hong Kong, China
+852 800 906 020 (Toll Free)
United States
+1 844 606 0804 (Toll Free)
United Kingdom
+44 808 196 4551 (Toll Free)
Canada
+1 888 605 7930 (Toll Free)
Australia
+61 1300 986 386 (Toll Free)
EdgeOne hotline
+852 300 80699
More local hotlines coming soon