Can docker containers share dependencies?

1 Answer. Yes, answer is “true” to both questions. If you start 2 (or more) containers on the same host, all using the same base image, the whole content of the base image will be shared. What is called as an “image” is, in fact, multiple images called “layers” with parent-child relationships, stacked together.

Does each docker container have its own OS?

Unlike VMs, containers do not have an OS within it. They simply share the underlying kernel with the other containers. Docker containers can actually run within VMs. This allows teams to containerize each service and run multiple Docker containers per vm.

How docker containers interact with each other?

Docker creates virtual networks which let your containers talk to each other. In a network, a container has an IP address, and optionally a hostname. A user-defined bridge network, which you create yourself, and allows your containers to communicate with each other, by using their container name as a hostname.

Do docker containers have their own kernel?

No. Docker image/container only has the application layer of the OS and uses the kernel and CPU of the host machine. So if you have multiple docker containers running on a host they will all share the kernel of the host.

What OS runs in a Docker container?

The Docker platform runs natively on Linux (on x86-64, ARM and many other CPU architectures) and on Windows (x86-64). Docker Inc. builds products that let you build and run containers on Linux, Windows and macOS.

Are Docker containers cross platform?

Docker is supposed to be a cross-platform tool. It runs on MacOS, Windows and Linux. You can use the containers everywhere, so it should be cross-platform.

How is a docker container different from a VM?

Docker is container based technology and containers are just user space of the operating system. A Virtual Machine, on the other hand, is not based on container technology. They are made up of user space plus kernel space of an operating system. Under VMs, server hardware is virtualized.

How do containers communicate with each other inside a pod?

Containers in a Pod share the same IPC namespace, which means they can also communicate with each other using standard inter-process communications such as SystemV semaphores or POSIX shared memory. Containers use the strategy of the localhost hostname for communication within a pod.