Anchors in docker-compose.yaml

docker-compose.yaml

version: "3.4"

x-defaults: &defaults
  image: "dask-dev/dask-notebook"
  
  # With lists, each entry requires its own anchor if you
  # intend to extend/reuse an entry in concrete services.
  configs:
    - &configs_condarc
      source: "condarc"
      target: "/etc/conda/condarc"
      mode: 444
      
    - &configs_pip
      source: "pip"
      target: "/etc/pip.conf"
      mode: 444
  
  # For dictionaries anchor at the root.
  environment: &environment
    DASK_SCHEDULER_ADDRESS: "tcp://dask_scheduler:8786"
    
    EXTRA_APT_PACKAGES: "g++ unixodbc-dev"
    EXTRA_PIP_PACKAGES: "pip"
    
    NB_GID: "100"
    GRANT_SUDO: "yes"
    
  volumes:
    - &volumes_localtime
      type: "bind"
      source: "/etc/localtime"
      target: "/etc/localtime"
      read_only: yes
      
    # Bind host certificates into container -- ensure that
    # the path matches the container's expectations.
    - &volumes_certificates
      type: "bind"
      source: "/etc/pki/tls/certs/ca-bundle.crt"
      target: "/etc/ssl/certs/ca-certificates.crt"
      read_only: yes
      
# Now define the services, overriding the values as
# needed:
services:
  jupyterlab_foo:
    <<: *defaults
    
    environment:
      <<: *environment
      NB_USER: "foo"
      
  jupyterlab_bar:
    <<: *defaults
    
    environment:
      <<: *environment
      NB_USER: "bar"
      
  jupyterlab_bar:
    <<: *defaults
    
    environment:
      <<: *environment
      NB_USER: "baz"