Add domain name change instructions to docs. (#1044)

* Add domain name change instructions to docs.

* Changing docker execs to docker-compose execs

diff --git a/docs/src/administration_backup_and_restore.md b/docs/src/administration_backup_and_restore.md
index fe97cf88047ec7ef9f8de8212136e17535637506..633c687fb7d4364ec9b5c040bfce6e1080de1176 100644 (file)
--- a/docs/src/administration_backup_and_restore.md
+++ b/docs/src/administration_backup_and_restore.md
@@ -9,14 +9,14 @@ When using docker or ansible, there should be a `volumes` folder, which contains
 To incrementally backup the DB to an `.sql` file, you can run: 
 
 ```bash
-docker exec -t FOLDERNAME_postgres_1 pg_dumpall -c -U lemmy >  lemmy_dump_`date +%Y-%m-%d"_"%H_%M_%S`.sql
+docker-compose exec postgres pg_dumpall -c -U lemmy >  lemmy_dump_`date +%Y-%m-%d"_"%H_%M_%S`.sql
 ```
 ### A Sample backup script
 
 ```bash
 #!/bin/sh
 # DB Backup
-ssh MY_USER@MY_IP "docker exec -t FOLDERNAME_postgres_1 pg_dumpall -c -U lemmy" >  ~/BACKUP_LOCATION/INSTANCE_NAME_dump_`date +%Y-%m-%d"_"%H_%M_%S`.sql
+ssh MY_USER@MY_IP "docker-compose exec postgres pg_dumpall -c -U lemmy" >  ~/BACKUP_LOCATION/INSTANCE_NAME_dump_`date +%Y-%m-%d"_"%H_%M_%S`.sql
 
 # Volumes folder Backup
 rsync -avP -zz --rsync-path="sudo rsync" MY_USER@MY_IP:/LEMMY_LOCATION/volumes ~/BACKUP_LOCATION/FOLDERNAME
@@ -37,6 +37,45 @@ cat db_dump.sql  |  docker exec -i FOLDERNAME_postgres_1 psql -U lemmy # restore
 docker exec -i FOLDERNAME_postgres_1 psql -U lemmy -c "alter user lemmy with password 'bleh'"
 ```
 
+### Changing your domain name
+
+If you haven't federated yet, you can change your domain name in the DB. **Warning: do not do this after you've federated, or it will break federation.**
+
+Get into `psql` for your docker: 
+
+`docker-compose exec postgres psql -U lemmy`
+
+```
+-- Post
+update post set ap_id = replace (ap_id, 'old_domain', 'new_domain');
+update post set url = replace (url, 'old_domain', 'new_domain');
+update post set body = replace (body, 'old_domain', 'new_domain');
+update post set thumbnail_url = replace (thumbnail_url, 'old_domain', 'new_domain');
+
+delete from post_aggregates_fast;
+insert into post_aggregates_fast select * from post_aggregates_view;
+
+-- Comments
+update comment set ap_id = replace (ap_id, 'old_domain', 'new_domain');
+update comment set content = replace (content, 'old_domain', 'new_domain');
+
+delete from comment_aggregates_fast;
+insert into comment_aggregates_fast select * from comment_aggregates_view;
+
+-- User
+update user_ set actor_id = replace (actor_id, 'old_domain', 'new_domain');
+update user_ set avatar = replace (avatar, 'old_domain', 'new_domain');
+
+delete from user_fast;
+insert into user_fast select * from user_view;
+
+-- Community
+update community set actor_id = replace (actor_id, 'old_domain', 'new_domain');
+
+delete from community_aggregates_fast;
+insert into community_aggregates_fast select * from community_aggregates_view;
+```
+
 ## More resources
 
 - https://stackoverflow.com/questions/24718706/backup-restore-a-dockerized-postgresql-database