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Federation
Note: ActivityPub federation is still under development. We recommend that you only enable it on test instances for now.
To enable federation, change the setting federation.enabled to true in lemmy.hjson, and restart Lemmy.
Federation does not start automatically, but needs to be triggered manually through the search. To do this you have to enter a reference to a remote object, such as:
!main@lemmy.ml(Community)@nutomic@lemmy.ml(User)https://lemmy.ml/c/programming(Community)https://lemmy.ml/u/nutomic(User)https://lemmy.ml/post/123(Post)
For an overview of how federation in Lemmy works on a technical level, check out our Federation Overview.
Instance allowlist and blocklist
The federation section of Lemmy's config has two variables allowed_instances and blocked_instances. These control which other instances Lemmy will federate with. Both settings take a comma separated list of domains, eg lemmy.ml,example.com. You can either change those settings via /admin, or directly on the server filesystem.
It is important to note that these settings only affect sending and receiving of data between instances. If allow federation with a certain instance, and then remove it from the allowlist, this will not affect previously federated data. These communities, users, posts and comments will still be shown. They will just not be updated anymore. And even if an instance is blocked, it can still fetch and display public data from your instance.
By default, both allowed_instances and blocked_instances values are empty, which means that Lemmy will federate with every compatible instance. We do not recommend this, because the moderation tools are not yet ready to deal with malicious instances.
What we do recommend is putting a list of trusted instances into allowed_instances, and only federating with those. Note that both sides need to add each other to their allowed_instances to allow two-way federation.
Alternatively you can also use blocklist based federation. In this case, add the domains of instances you do not want to federate with. You can only set one of allowed_instances and blocked_instances, as setting both doesn't make sense.