Docker 'docker' 命令找不到: 解决方案

The error message 'docker: not found' indicates that the 'docker' command is not found on your system. This can be caused by one of the following reasons:

• Docker is not installed. To check if Docker is installed, run the command docker --version. If Docker is not installed, you can follow the Docker installation guide for your operating system.
• Docker is not in your PATH variable. The PATH variable tells your system where to find executable files. To add the Docker binary directory to your PATH variable, follow the instructions for your operating system.
• Your terminal needs to be restarted. After making changes to your PATH variable, you may need to restart your terminal for the changes to take effect.

If you've checked all of these possibilities and you're still encountering the error, please provide more details about your operating system and the steps you've taken to troubleshoot the issue.