Do docker containers have their own kernel and CPU

Question

Hi everyone,

Docker is one of the most famous container service. In general scenario, when we installed an OS in our system it takes lots of time. But in docker, It takes very less amount of time to launch an container. How Kernel allows docker to launch a container so fast?

Thank You

Answer 1

Hi@akhtar,

No. Docker image/container only has the application layer of the OS and uses the kernel and CPU of the host machine. That's why docker container boot's so fast. In your host machine kernel is already running, so if you boot your docker container it will share the running kernel and start the container so fast.

So if you have multiple docker containers running on a host they will all share the kernel of the host.

Thank You