Container networking in Microservices - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is container networking?

Container networking is the way containers communicate with each other and with the outside world. It connects containers so they can share data and services.

intermediate

Name a common network model used in container orchestration platforms like Kubernetes.

The common network model is the "flat network" where every container gets its own IP address and can communicate directly with others without NAT (Network Address Translation).

intermediate

What is a network namespace in container networking?

A network namespace isolates the network stack for a container. It means each container can have its own IP addresses, routing tables, and ports, separate from the host or other containers.

advanced

Explain the role of a Container Network Interface (CNI).

CNI is a set of standards and plugins that help connect containers to networks. It manages IP address allocation and network setup for containers in a consistent way.

advanced

What is the difference between bridge and overlay networks in container networking?

Bridge networks connect containers on the same host, like a local switch. Overlay networks connect containers across multiple hosts, creating a virtual network over the physical one.

Which of the following best describes a network namespace?

A A physical network switch

B An isolated network environment for a container

C A type of container image

D A storage volume for containers

A network namespace isolates the network stack for a container, giving it its own IP and ports.

What does CNI stand for in container networking?

A Container Network Isolation

B Container Node Integration

C Container Network Interface

D Cloud Network Infrastructure

CNI stands for Container Network Interface, a standard for configuring container networks.

Which network type connects containers across multiple hosts?

A Overlay network

B Host network

C Bridge network

D Loopback network

Overlay networks create a virtual network over physical networks to connect containers on different hosts.

In Kubernetes, how do containers typically communicate within a pod?

A Using separate IP addresses

B Through external load balancer

C Via host network only

D Using shared network namespace

Containers in the same pod share the same network namespace, allowing them to communicate via localhost.

What is the main purpose of a bridge network in container environments?

A Connect containers on the same host

B Connect containers across different hosts

C Provide internet access to containers

D Isolate containers from the host

Bridge networks connect containers on the same host, acting like a virtual switch.

Describe how container networking allows containers to communicate within the same host and across multiple hosts.

Think about local vs virtual networks and how IP addresses are assigned.

Explain the concept of network namespaces and why they are important in container networking.

Imagine each container having its own private network space.