How to check memory in docker

Viewing memory usage within Docker is a very important operation, because the memory usage of the container is directly related to the stability and performance of the application. This article will introduce several methods to view memory usage within Docker containers.

Method 1: Use the top command

The top command can help us view the memory usage of each process in the Docker container in real time. Use the top command in a Docker container the same way as on a Linux system.

Enter the Docker container through the following command:

docker exec -it <container_name> /bin/bash

Then use the top command to view the memory usage:

top

The system memory usage and the memory usage of each process will be displayed. Condition.

Method 2: Use the free command

The free command can help us check the system memory usage in the Docker container and get the size of free memory in the system. Use the free command in a Docker container in the same way as on a Linux system.

Enter the Docker container through the following command:

docker exec -it <container_name> /bin/bash

Then use the free command to check the memory usage:

free -m

The output will show the system memory usage, including the total memory Amount, used memory, free memory, etc.

Method 3: Use the docker stats command

The docker stats command can help us check the memory and CPU usage of the running Docker container. Information such as memory usage, total CPU usage percentage, average, maximum and minimum usage inside the container can be obtained.

Run the following command from the command line:

docker stats <container_name>

This will output the memory and CPU usage of the container. Use Ctrl C to exit.

Method 4: Use Docker Dashboard

If you use Docker Desktop, you can use Docker Dashboard to view the Docker internal indicators and statistics of the container, which includes container memory usage, etc.

Launch Docker Dashboard within the Docker Desktop application and select the container you want to view. In the container's overview interface, you will see information such as the current container's total memory, used memory, usable memory, and memory usage.

Summary

There are several ways to view memory in a Docker container as mentioned above, the most commonly used of which are the top command and the docker stats command. No matter which approach you take, be sure to review and optimize your container's memory usage to ensure application stability and performance.

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