machines:
  '0':
    constraints: arch=amd64
    series: xenial

series: xenial
services:
  mysql:
    annotations:
      gui-x: '0'
      gui-y: '250'
    charm: cs:xenial/percona-cluster-2
    num_units: 1
    options:
      max-connections: 20000
    to:
    - lxc:0