Oliver Seitz

Docker network without Docker

Docker networking isn't magic. See how to build its core features from scratch using only fundamental Linux utilities like bridges, veth pairs, and iptables.

Docker network without Docker
#1about 2 minutes

Understanding container isolation with namespaces and cgroups

Containers use Linux namespaces for process isolation and cgroups for resource limiting, which necessitates explicit networking configurations for communication.

#2about 5 minutes

Establishing host-to-container communication with virtual ethernet pairs

A virtual ethernet (veth) pair acts as a point-to-point virtual cable, connecting a container's isolated network namespace directly to the host system.

#3about 5 minutes

Using virtual bridges for multi-container communication

A virtual network bridge functions like a physical switch, allowing multiple containers to communicate with each other through a single shared interface.

#4about 11 minutes

Analyzing Docker's IPtables rules for network isolation

Docker automatically creates IPtables rules in chains like DOCKER-ISOLATION-STAGE-1 to prevent unwanted traffic between different custom networks by default.

#5about 5 minutes

Manually configuring port forwarding for a running container

Port forwarding is achieved by adding a Destination NAT (DNAT) rule to the IPtables nat table, which can be added or modified for an already running container.

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Matching moments

Deconstructing the Docker stack to its Linux primitives
01:20 MIN

Deconstructing the Docker stack to its Linux primitives

Docker exec without Docker

Understanding Docker fundamentals for application deployment
07:06 MIN

Understanding Docker fundamentals for application deployment

Rust and Docker: Let's build an AI-powered app!

Understanding how the docker exec command really works
01:22 MIN

Understanding how the docker exec command really works

Docker exec without Docker

How container isolation works in the Linux kernel
07:05 MIN

How container isolation works in the Linux kernel

Kubernetes Security - Challenge and Opportunity

Exploring the Docker ecosystem and image layers
07:11 MIN

Exploring the Docker ecosystem and image layers

Database DevOps with Containers

Running containers with access to vehicle electronics
05:35 MIN

Running containers with access to vehicle electronics

A Hitchhikers Guide to Container Security - Automotive Edition 2024

Bridging gaps with DevOps and containerization
02:34 MIN

Bridging gaps with DevOps and containerization

From Punch Cards to AI-assisted Development

Introducing bootable containers and the CNCF donation
02:31 MIN

Introducing bootable containers and the CNCF donation

Bootable AI Containers with Podman Desktop

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From learning to earning

Jobs that call for the skills explored in this talk.

Devops Container Engineer

Devops Container Engineer

Softwarezentrum Böblingen/Sindelfingen e.V.
Böblingen, Germany

Remote
Intermediate
GIT
Bash
Azure
Linux
+5