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Docker-in-Docker with network_mode host for multi-node simulation
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| name | dind-network-host-pattern |
| description | Docker-in-Docker with network_mode host for multi-node simulation |
| tags | ["docker","dind","testing","infrastructure"] |
When simulating a multi-node deployment with Docker-in-Docker, use network_mode: host inside the DinD containers. This makes inner containers bind to the DinD container's network namespace, preserving the outer network's IP addressing.
Outer docker-compose (host)
├── service-a DinD container → fixed IP 10.0.0.2
│ └── inner container (network_mode: host) → binds to 10.0.0.2
├── service-b DinD container → fixed IP 10.0.0.3
│ └── inner container (network_mode: host) → binds to 10.0.0.3
Build on host, save to per-node cache directories, load inside DinD:
# Host: save image
docker save myimage:latest | gzip > image-cache/node-a/myimage.tar.gz
# DinD entrypoint: load image
for img in /image-cache/*.tar.gz; do
gunzip -c "$img" | docker load
done
Use nested exec (outer → inner) to interact with inner containers:
# Exec into inner container via outer DinD
docker compose exec -T dind-node-a \
docker compose -f /compose/docker-compose.yml exec -T service-a <command>
x-dind-common: &dind-common
image: docker:dind
privileged: true
environment:
DOCKER_TLS_CERTDIR: ""
entrypoint: ["/compose/entrypoint.sh"]
restart: unless-stopped
services:
dind-node-a:
<<: *dind-common
volumes: [...]
networks:
net:
ipv4_address: 10.0.0.2
docker:dind requires privileged: trueDOCKER_TLS_CERTDIR="" to disable TLS (simplifies test environments)