Does the container automatically start when the server's operating system restarts?

By default, Docker containers do not start automatically after the operating system is rebooted. To make a container start automatically, you need to explicitly specify a restart policy when creating or configuring the container.

For example, when running a container, you can use the --restart option:

docker run --restart unless-stopped my-container

Possible values for --restart:

• no — do not restart the container automatically (default value)
• on-failure — restart the container on failure
• always — always restart the container
• unless-stopped — restart unless the container was manually stopped

Thus, to have the container start automatically upon server restart, you need to set the appropriate restart policy.