Caddyfile for running Mastodon – November 2022 edition

README.md

Caddyfile (v2+) for Mastodon

nginx? Boo.. Caddy? Yay!

Please note this was not of my own creation. It comes from Naoki Kosaka's https://gist.github.com/yukimochi/bb7c90cbe628f216f821e835df1aeac1

If you are finding your asset / static files are all 404 with this, this can help:

usermod -aG mastodon caddy

Alternatively, you could get Mastodon's Rails process to serve static files itself, but they advise against this for performance reasons.

Caddyfile

put.your.domain.here {

  @local {
    file
    not path /
  }

  log {
    output file /var/log/caddy/mastodon.log
  }

  @local_media {
    path_regexp /system/(.*)
  }
  @streaming {
    path /api/v1/streaming/*
  }
  @cache_control {
    path_regexp ^/(emoji|packs|/system/accounts/avatars|/system/media_attachments/files)
  }

  root * /home/mastodon/live/public

  encode zstd gzip

  handle_errors {
    rewrite 500.html
    file_server
  }

  header {
    Strict-Transport-Security "max-age=31536000"
  }
  header /sw.js Cache-Control "public, max-age=0"
  header @cache_control Cache-Control "public, max-age=31536000, immutable"

  handle @local {
    file_server
  }


  ## If you've been migrated media from local to object storage, this navigate old URL to new one.
  # redir @local_media https://yourobjectstorage.example.com/{http.regexp.1} permanent

  reverse_proxy @streaming {
    to http://localhost:4000

    transport http {
      keepalive 5s
      keepalive_idle_conns 10
    }
  }

  reverse_proxy  {
    to http://localhost:3000

    header_up X-Forwarded-Port 443
    header_up X-Forwarded-Proto https

    transport http {
      keepalive 5s
      keepalive_idle_conns 10
    }
  }
}