LDAP

In order for LDAP to work, the seafile-server needs to be able to establish a connection to the LDAP server. Because the seafile-net is defined as internal: true, the service won't reach the LDAP server, as long as you don't deploy it into the same stack and also connect it to seafile-net. As a workaround define another network in the networks top-level element. Like this:

networks:
  seafile-net:
    internal: true
  ext:

If not defined otherwise, the network will automatically have external access. Then hook up seafile-server to this network:

seafile-server:
    ...
    networks:
    - seafile-net
    - ext