Rancher: New containers for the (server) farm – quick and easy

version: '2'
services:
  WordPress:
    image: wordpress:latest
    environment:
      WORDPRESS_DB_HOST: database:3306
      WORDPRESS_DB_PASSWORD: wordpress
    links:
    - database:database
  Loadbalancer:
    image: rancher/lb-service-haproxy:v0.4.6
    ports:
    - 80:80/tcp
  database:
    image: mysql:5.7
    environment:
      MYSQL_ROOT_PASSWORD: wordpress
      MYSQL_PASSWORD: wordpress
      MYSQL_USER: wordpress
      MYSQL_DATABASE: wordpress

rancher-compose.yml:

version: '2'
services:
  WordPress:
    scale: 2
    start_on_create: true
  Loadbalancer:
    scale: 1
    start_on_create: true
    lb_config:
      certs: []
      port_rules:
      - hostname: ''
        path: ''
        priority: 1
        protocol: http
        service: WordPress
        source_port: 80
        target_port: 80
    health_check:
      response_timeout: 2000
      healthy_threshold: 2
      port: 42
      unhealthy_threshold: 3
      interval: 2000
  database:
    scale: 1
    start_on_create: true

In this example, there are two WordPress containers to which the load balancer distributes the requests.
In addition, a catalog with preconfigured stacks can be used in the Rancher interface. For these stacks, you can define which parameters still need to be specified and everything else is already preconfigured. There is a clear catalog of the Rancher community for certain stacks that are frequently used or can also be used very well for testing Rancher.

In addition to the community catalog, you can also create and integrate your own catalog via GitHub. This can also be used to create a catalog of preconfigured stacks in an internal network that are frequently used or where the majority of the configuration is not changed. In most cases, this makes it even easier to start an entire program stack than via rancher-compose and does not require any prior knowledge of which configuration parameters are required for operation.

This is part 5 of a series of blog posts on the topic of Docker/Rancher.

Part 1 provides an overview of Docker and container environments

Part 2 explains the functions of a Docker registry and docker-compose

Part 3 introduces Docker Swarm with a Docker environment distributed across multiple hosts

Part 4 shows Rancher as an orchestration tool for Docker (and other container environments)