What applications need to be monitored in docker

Docker has become increasingly popular, with many companies and individuals containerizing applications to improve development and deployment efficiency. However, when an application is running in a Docker container, we need to consider how to monitor it to ensure its performance and reliability. This article will discuss several important aspects of applications that need to be monitored in docker.

1. Docker container running status

In Docker, we can check the running status of the container through the command line tool. For example, use the docker ps command to display all running containers and their status. You can monitor the running status of containers in Docker through the following command:

docker ps

This command will list all running Docker containers. In the listed information, we can see the container's ID, name, image, status, port mapping and startup command.

2. Container resource usage

When the container is running, it is necessary for us to check and monitor the resource usage of the container, which includes CPU, memory and network bandwidth. Some of Docker's built-in tools can be used to monitor resource usage, such as:

• docker stats command: This command can display the resource usage of running containers and refresh statistics regularly. Use this command to quickly understand the hardware resource usage of the container.
• docke top command: This command can be used to query the currently active processes in the container. The top processes will consume the most resources.

3. Application log

In Docker, after the container is started, the log data generated by the application will be stored in the standard output or standard error output of the container . If we don't monitor the container's logs, we won't be able to detect and resolve failures in a timely manner. Therefore, in order to avoid wasting time and resources troubleshooting problems, we should focus on the following two aspects:

• Extract logs from the container for real-time monitoring. We can use the docker logs command to monitor docker in real time. Container logs.
• Dump logs to the central log library. Most modern applications support dumping logs to a central log repository, such as Logstash, Kibana, and Elasticsearch.

4. Monitoring of application metrics

In addition to the running status and resource usage of the container, we also need to monitor specific metrics of the application itself. For example, we need to monitor the request rate, response time, error rate, cache hit rate and other indicators of the web application. How to monitor and analyze these indicators?

• Frequently view and monitor the status and policies of the application to ensure the stability and scalability of the program;
• Use hooks to implement real-time notifications and operations of the program.

5. Container security

When running a container, we also need to ensure the appropriate security. How to monitor the security of Docker containers?

• Pay attention to the network traffic of the container, and promptly identify and intercept abnormal traffic;
• Understand and update all components and their versions in the Docker container;
• Follow Container OS vulnerabilities and security patches ensure the security of the container OS.

Summary

When using Docker container technology, we need to monitor the Docker container, understand the running status and resource usage of the container, solve faults in a timely manner, and ensure the reliability of the container and security. At the same time, you also need to pay attention to the indicators of the application itself and take measures to ensure its efficiency and security.

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