docker-compose.yml

version: '3'
services:
  [...]
  sidekiq_1:
    build: .
    image: tootsuite/mastodon
    restart: always
    env_file: .env.production
    command: bundle exec sidekiq -c 25
    volumes:
      - /var/www/mastodon/system:/mastodon/public/system
    healthcheck:
      test: ['CMD-SHELL', "ps aux | grep '[s]idekiq\ 6' || false"]
    cpu_shares: 512

  sidekiq_2:
    build: .
    image: tootsuite/mastodon
    restart: always
    env_file: .env.production
    command: bundle exec sidekiq -c 25 -C /opt/mastodon/config/sidekiq-helper.yml
    volumes:
      - /var/www/mastodon/system:/mastodon/public/system
    healthcheck:
      test: ['CMD-SHELL', "ps aux | grep '[s]idekiq\ 6' || false"]
    cpu_shares: 512