As an operation and maintenance engineer, what difficult problems have you encountered?

As an operation and maintenance engineer, what difficult problems have you encountered?

As an operation and maintenance engineer, I have encountered many difficult problems. Some of these problems made me feel very confused and helpless, but through continuous learning and practice, I finally found a solution. Here are a few of the tougher issues I've encountered and how I resolved them:

1. System performance problems under high concurrency

In a project, our system needs to support a large number of users accessing at the same time, which leads to a sharp drop in system performance. By monitoring the usage of system resources, we found that the CPU and memory usage are very high. After analysis, we found that it was caused by too many connections to the database. In order to solve this problem, we optimized the database, including increasing the connection pool size of the database, adjusting the cache size and other measures. In the end, we succeeded in more than doubling the concurrency of the system.

2. Troubleshooting and resolution of network faults

During a maintenance process, we found that the network connection speed of some users was very slow, and they could not even access the website normally. By monitoring network traffic and log information, we found that it was caused by a network card failure of a certain server. In order to solve this problem, we immediately replaced the network card of the server and reconfigured the network parameters. In the end, we successfully resolved the network failure and restored normal access for users.

3. Application crash recovery and repair

During one go-live, we encountered an issue where the app suddenly crashed. By monitoring system logs and application logs, we found that it was caused by an incompatible version of a third-party library. In order to solve this problem, we immediately contacted the developer of the third-party library and upgraded the version of the library. In the end, we successfully fixed the app crash issue and ensured the stability and reliability of the system.

Here are some common O&M issues and possible solutions for reference:

1. System performance problems:

• Problem: The application takes too long to respond and the system load is high.
• Solution: Use performance monitoring tools to analyze system indicators and locate bottlenecks. Check system resource usage such as CPU, memory, disk and network. Optimize code, adjust configuration parameters, increase hardware resources, etc. to improve system performance.

2. Network failure:

• Problem: The network connection is lost, making services inaccessible.
• Solution: Check the status and configuration of network devices (such as routers, switches). Track network traffic and latency with network monitoring tools. Perform network troubleshooting, reboot devices, reconnect cables, and resolve physical or logical issues.

3. Security vulnerabilities and attacks:

• Problem: The system faces a security breach or is under malicious attack.
• Solution: Update and patch software vulnerabilities to ensure that the latest security patches are applied in a timely manner. Configure firewalls and intrusion detection systems to limit unauthorized access. Analyze logs and anomalous events to identify and respond to malicious behavior.

4. Database performance issues:

• Problem: Database queries are slow or under heavy load.
• Solution: Analyze database query execution plan and index design, optimize SQL statement and table structure. Adjust database parameters and cache size, increase hardware resources (such as memory) to improve database performance.

5. Performance testing and load balancing:

• Problem: The system cannot handle a large number of user requests, resulting in poor performance.
• Solution: Do load testing, simulating real users and stress testing the system. Adjust system configuration, increase resources or use load balancing technology according to test results to ensure that the system can still provide stable performance under high load conditions.

6. Automated deployment and configuration management:

• Problem: Deploying and configuring the system is cumbersome and error-prone.

• Solution: Use automation tools (such as Ansible, Puppet, Chef) to create scripts or templates to quickly and consistently deploy and configure servers. Bring configuration items and environment settings into version control with continuous integration and continuous delivery for rapid deployment of updates and changes.

These are detailed descriptions of some common thorny problems and solutions for operations engineers. However, the solution to each problem may vary depending on the context and specific requirements. In actual work, operation and maintenance engineers need to adjust the solution according to the specific situation and cooperate with the team to solve the problem.

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