Docker / Docker Swarm / Kubernetes

nerdlunch

Docker

Docker containers

• Are independent (basically a virtual machine)
• Have environment varibles
• one process running (as opposed to a virtual machine)
• have a root volume
• one entrypoint

Containers

Layers of changes to a basic container.

layers can be cached.

every command == layer

Order them so the most changed stuff is at the top

Networks

bridge network: you have your own internal network that gets translated into a different address when it goes out.

host network: ???

overlay network: Docker Swarm/Kubernetes make them think they are in the same network even if they are in other network.

Docker Compose

http://elasticsearch:9200 <- Looks like this

Ports

Docker (can) expose (map) ports. There's a host port. Way to make it look like a host network.

Volumes

How you get persistent data.

named volumes: way to keep stuff around. (docker gives them a uuid if unnamed)

You can mount a volume from your host machine.

Docker Swarm / Kubernetes

multiple container working together with network, ins and lifecycle

• Entry Nodes (docker compose / kubernetes) -> route to right place in cluster

Kubernetes

Can mount ebs volumes