Multi-host setup

Hoister supports running multiple agents on different hosts, each monitoring its own Docker daemon. All agents report to a single controller, and the dashboard groups containers by hostname and project.

Architecture

┌─────────────┐     ┌─────────────┐     ┌─────────────┐
│ host-alpha  │     │  host-beta  │     │ host-gamma  │
│(project-web)│     │(project-web)│     │(project-api)│
│             │     │             │     │             │
│  hoister    │     │  hoister    │     │  hoister    │
│  agent      │     │  agent      │     │  agent      │
└──────┬──────┘     └──────┬──────┘     └──────┬──────┘
       │                   │                   │
       └───────────────────┼───────────────────┘
                           │
                    ┌──────┴───────┐
                    │  controller  │
                    │  + frontend  │
                    └──────────────┘

Each agent identifies itself with a hostname and a project name. The controller uses these to distinguish which containers belong to which host and project.

Controller and frontend

Deploy the controller and frontend on a central host. See the Dashboard guide for the basics.

docker-compose.yml (central host)

services:
  hoister-controller:
    image: emrius11/hoister-controller:latest
    volumes:
      - controller-data:/data

  hoister-frontend:
    image: emrius11/hoister-frontend:latest
    ports:
      - "3000:3000"
    environment:
      HOISTER_CONTROLLER_URL: "http://hoister-controller:3033"
      HOISTER_AUTH_USERNAME: admin
      HOISTER_AUTH_PASSWORD: $2y$05$xXHhvkw0Jl95eYvK9zMubuTj39YgyKcwj2etuEgLFeec4.S9K5AVC

volumes:
  controller-data:

Agent configuration

On each host, deploy a hoister agent and point it at the controller. Set HOISTER_HOSTNAME and HOISTER_PROJECT to identify the agent.

Host Alpha (project-web)

docker-compose.yml (host-alpha)

services:
  hoister:
    image: emrius11/hoister:latest
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
    security_opt:
      - no-new-privileges:true
    environment:
      HOISTER_HOSTNAME: host-alpha
      HOISTER_PROJECT: project-web
      HOISTER_CONTROLLER_URL: "http://controller.example.com:3033"
      HOISTER_SCHEDULE_INTERVAL: "60"

  nginx:
    image: nginx:latest
    labels:
      - "hoister.enable=true"

Host Beta (project-web)

A second host in the same project. The controller will show both hosts side by side.

docker-compose.yml (host-beta)

services:
  hoister:
    image: emrius11/hoister:latest
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
    security_opt:
      - no-new-privileges:true
    environment:
      HOISTER_HOSTNAME: host-beta
      HOISTER_PROJECT: project-web
      HOISTER_CONTROLLER_URL: "http://controller.example.com:3033"
      HOISTER_SCHEDULE_INTERVAL: "60"

  nginx:
    image: nginx:latest
    labels:
      - "hoister.enable=true"

Host Gamma (project-api)

A different project on a third host.

docker-compose.yml (host-gamma)

services:
  hoister:
    image: emrius11/hoister:latest
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
    security_opt:
      - no-new-privileges:true
    environment:
      HOISTER_HOSTNAME: host-gamma
      HOISTER_PROJECT: project-api
      HOISTER_CONTROLLER_URL: "http://controller.example.com:3033"
      HOISTER_SCHEDULE_INTERVAL: "60"

  httpbin:
    image: kennethreitz/httpbin:latest
    labels:
      - "hoister.enable=true"

Environment variables

Variable	Description
HOISTER_HOSTNAME	Identifies the host in the dashboard. Defaults to the container ID if not set.
HOISTER_PROJECT	The project name. Must match the Docker Compose project name (com.docker.compose.project label) on that host.
HOISTER_CONTROLLER_URL	URL of the controller (e.g. http://controller.example.com:3033).
HOISTER_SCHEDULE_INTERVAL	Seconds between container state reports to the controller.

TLS

When exposing the controller over a network, you should encrypt traffic between agents and the controller. See the TLS encryption guide for setup instructions. In short, add these to each agent:

volumes:
  - ./certs/ca.pem:/certs/ca.pem:ro
environment:
  HOISTER_CONTROLLER_URL: "https://controller.example.com:3033"
  HOISTER_CONTROLLER_CA_CERT_PATH: /certs/ca.pem

Hiding infrastructure containers

Agents report all containers in their Docker Compose project. To hide Hoister’s own containers from the dashboard, add the hoister.hide label:

services:
  hoister:
    image: emrius11/hoister:latest
    labels:
      - "hoister.hide=true"