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.
#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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