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- Quick Start
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- Fault Action Library
- Compute
- JVM Process CPU at Full Load
- Cross-AZ Experiment in CVM
- CVM DNS Unavailability Experiment
- CVM Domain Name Parsing Tampering Experiment
- CVM System Time Skew
- CVM Disk IO Hang Fault Experiment
- CVM Memory OOM and Disk IO Load
- Experiments on CVM Intra-host Network Disorder
- CVM Kernel Faults
- Experiments on CVM Intra-host Network Latency
- High Utilization of CVM Resources (CPU, Memory, and Disk)
- Experiments on CVM Intra-host Network Corruption
- Experiments on CVM Intra-host Network Duplication
- Experiments on CVM Intra-host Network Occupation
- CVM Network Interruption
- CVM Ping Unreachable
- Cloud API Ban in CVM
- Database
- Primary-secondary Switch in TencentDB for PostgreSQL
- MySQL Instance Overall Unavailable
- Primary-secondary Switch in MySQL
- Setting Maximum Number of Connections in MySQL
- Primary Node Fault Experiment on TencentDB for MySQL
- TencentDB for MySQL Read-only Instance Group Unavailable
- Primary-secondary Switch in TDSQL for MySQM
- Primary-secondary Switch in MariaDB
- Primary-secondary Switch in TDSQL-C
- Practice of TencentDB for Redis Proxy Node Faults
- TencentDB for Redis Primary Node Fault
- Primary-secondary Nodes in TencentDB for Redis Instance Unavailable
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- Restarting TencentDB for MySQL
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CVM DNS Unavailability Experiment
Last updated: 2024-09-26 15:47:38
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 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.
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