Can a Docker container run multiple images?

It allows you to create multiple image layers on top of the previous layers and the AS command provides a virtual name to the intermediate image layer. The last FROM command in the dockerfile creates the actual final image.

How many images can run in a Docker container?

You can create an unlimited number of Docker images from one image base. Each time you change the initial state of an image and save the existing state, you create a new template with an additional layer on top of it.

How do I run multiple images in Docker?

Can a Docker container run multiple processes?

It's ok to have multiple processes, but to get the most benefit out of Docker, avoid one container being responsible for multiple aspects of your overall application. You can connect multiple containers using user-defined networks and shared volumes.

Can a Dockerfile build multiple images?

A multistage build allows you to use multiple images to build a final product. In a multistage build, you have a single Dockerfile, but can define multiple images inside it to help build the final image.

Multiple containers for same image with docker port

Can we have 2 base images?

No. Docker does not support this as it would be effectively combining multiple Linux root filesystems. The easiest way to do this would be to start from Ubuntu and then install openjdk, or find an image on docker hub which does so already. So basically the answer is NO.

Can a Dockerfile have 2 from?

With multi-stage builds, you use multiple FROM statements in your Dockerfile. Each FROM instruction can use a different base, and each of them begins a new stage of the build. You can selectively copy artifacts from one stage to another, leaving behind everything you don't want in the final image.

Can we lose our data when a Docker container exits?

Do I lose my data when the container exits? ? Not at all! Any data that your application writes to disk gets preserved in its container until you explicitly delete the container.

Can multiple containers run on a single host?

Multiple containers can run on a single host. Containers decouple applications from operating systems so that you can have a clean and minimal Linux operating system and run everything else in some form of containers.

How do I run multiple Microservices in Docker?

Can we run multiple container of same image on single host?

No problem at all!

What is a Docker image vs container?

A Docker image packs up the application and environment required by the application to run, and a container is a running instance of the image. Images are the packing part of Docker, analogous to "source code" or a "program". Containers are the execution part of Docker, analogous to a "process".

What is difference between Docker and Kubernetes?

The difference between the two is that Docker is about packaging containerized applications on a single node and Kubernetes is meant to run them across a cluster. Since these packages accomplish different things, they are often used in tandem. Of course, Docker and Kubernetes can be used independently.

What is difference between image and container?

Image is created only once. Containers are created any number of times using image. Images are immutable. Containers changes only if old image is deleted and new is used to build the container.

Are containers and images the same thing?

Images describe the applications and how they can be run. Containers are the image instances, where multiple containers of the same image can be run, each in a different state.

What is the difference between pods and containers?

“A container runs logically in a pod (though it also uses a container runtime); A group of pods, related or unrelated, run on a cluster. A pod is a unit of replication on a cluster; A cluster can contain many pods, related or unrelated [and] grouped under the tight logical borders called namespaces.”

Does each Docker container have its own IP?

By default, the container is assigned an IP address for every Docker network it connects to. The IP address is assigned from the pool assigned to the network, so the Docker daemon effectively acts as a DHCP server for each container.

Can you run multiple Docker containers with same port?

Surprisingly or not, neither Docker nor Podman support exposing multiple containers on the same host's port right out of the box. Example: docker-compose failing scenario with "Service specifies a port on the host. If multiple containers for this service are created on a single host, the port will clash."

How many containers a pod can run?

Remember that every container in a pod runs on the same node, and you can't independently stop or restart containers; usual best practice is to run one container in a pod, with additional containers only for things like an Istio network-proxy sidecar.

When should you not use Docker?

Do Docker containers have an OS?

Docker does not has an OS in its containers. In simple terms, a docker container image just has a kind of filesystem snapshot of the linux-image the container image is dependent on.

Can Docker run on VM?

Yes, You Can Run Docker AND Virtualbox on Windows 10 Home.

Can two Docker images have same tag?

Yes you can. As long as the images' names are different you can tag them with the same ":tag".

Why are there so many Docker images?

This is because, Docker always creates a layer for each command and checks the cache if there is an immage with the current command + previous cache layer hash match. If any of them doesn't match, it would endup creating a new image.

Can you merge Docker images?

Docker doesn't do merges of the images, but there isn't anything stopping you combining the dockerfiles if available, and rolling into them into a fat image which you'd need to build.