Docker

Question 1

idea

Answer 1

we package ou

run any app on any machine

containers can talk to each other, so a Java app in one container can talk to SQL database in another

Question 2

scalability

Answer 2

you can scale up and down by increasing and decreasing the number of containers running the same application

Question 3

resources

Answer 3

are shared with the host => many containers on one host

Question 4

architecture

Answer 4

normal virtualisation: Infrastructure –> Host OS –> Hypervisor –> Guest OS(s) with their apps

Docker: Infrastructure –> Host OS –> Docker daemon –> Containers (because daemon is very light weight, you can run a lot of them)

Question 5

how to

Answer 5

1. create Dockerfile that describes how to create image
2. build Docker image from it (and optionally push to Docker Hub or Amazon ECR if private)
3. run Docker container from image

Question 6

to manager containers we need a container management platform

Answer 6

1. ECS
2. Fargate (serverless)
3. EKS (Kubernetes, out of scope)