Docker Registry

Description

Cluster-local Docker Registry that serves custom-built images to swarm workers.

Overview

Runs as a manager-pinned stateful service (service_is_stateful: true) on the swarm manager. Custom images built on the manager via compose build are tagged and pushed to this registry; workers pull from it on docker stack deploy and on reschedule, removing the need for out-of-band docker save | docker load distribution.

Storage lives in an NFS-backed volume so the registry contents survive container restarts and manager reschedules.

Cosmos

The diagram places Docker Registry in the Infinito.Nexus cosmos: the components it deploys (capabilities), the central services it consumes (dependencies), and its outward reach (federation and bridged external networks).

flowchart LR
    subgraph deps [Dependencies]
        dep_svc_bkp_volume_2_local["svc-bkp-volume-2-local 💻"]
        dep_svc_swarm_node["svc-swarm-node 💻"]
    end
    subgraph role [svc-registry-docker 🐳]
        svc_node["node"]
        svc_docker["docker"]
        svc_container_backup["container_backup"]
    end
    dep_svc_bkp_volume_2_local -- "1:1" --> svc_container_backup
    dep_svc_swarm_node -- "1:1" --> svc_node

Solid 1:1 edges are fixed relationships; dashed 0..1 edges are conditional (enabled only in matching deployments); red 0..0 edges are turned off in this role. Node markers show the role's deploy modes (💻 host, 🐳 compose, 🐝 swarm); ❌ marks a service that is explicitly turned off, and ⚙️ an Ansible role dependency declared in meta/main.yml.

Features

Manager-pinned, stateful: Single instance per cluster; bypasses swarm task lifecycle so its volume cannot end up on a worker.
NFS-backed storage: docker_registry_data survives container/manager restarts when storage backend is NFS.
Insecure HTTP (v1): No TLS for the initial implementation; the registry runs on the manager's host network and binds only the address the manager hostname resolves to, so no other interface listens. Each swarm node trusts the manager's <host>:5000 via daemon.json.insecure-registries.

Quick Setup

Development

Clone, set up the workstation, and deploy Docker Registry onto the local stack:

git clone https://github.com/infinito-nexus/core.git
cd core
make onboard
make compose-deploy mode=reinstall apps=svc-registry-docker full_cycle=false

Production

Run the published image to provision the inventory and deploy Docker Registry to a managed server (the mounted volume persists the inventory):

APP=svc-registry-docker
HOST=<your-server>
DOMAIN=<your-domain>
TLS_MODE=self_signed
SSH_PUBLIC_KEY="<your-ssh-public-key>"

docker run --rm -it \
  -v "$PWD/inventories:/etc/infinito.nexus/inventories" \
  -e APP="$APP" -e HOST="$HOST" -e DOMAIN="$DOMAIN" -e TLS_MODE="$TLS_MODE" -e SSH_PUBLIC_KEY="$SSH_PUBLIC_KEY" \
  ghcr.io/infinito-nexus/core/debian bash -c '
    INVENTORY=/etc/infinito.nexus/inventories/production
    infinito administration inventory provision "$INVENTORY" \
      --inventory-file "$INVENTORY/devices.yml" \
      --host "$HOST" \
      --include "$APP" \
      --vars "{\"TLS_MODE\": \"$TLS_MODE\", \"DOMAIN_PRIMARY\": \"$DOMAIN\", \"users\": {\"administrator\": {\"authorized_keys\": [\"$SSH_PUBLIC_KEY\"]}}}" &&
    infinito administration deploy dedicated "$INVENTORY/devices.yml" \
      --password-file "$INVENTORY/.password" \
      --diff -vv'

Credits

Implemented by Kevin Veen-Birkenbach. Part of the Infinito.Nexus Project and maintained by Kevin Veen-Birkenbach. Licensed under the Infinito.Nexus Community License (Non-Commercial).