You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
83 lines
3.3 KiB
83 lines
3.3 KiB
# Importing an existing Postgres database from another installation (optional)
|
|
|
|
Run this if you'd like to import your database from a previous installation.
|
|
(don't forget to import your Synapse `media_store` files as well - see [the importing-synape-media-store guide](importing-synapse-media-store.md)).
|
|
|
|
|
|
## Prerequisites
|
|
|
|
For this to work, **the database name in Postgres must match** what this playbook uses.
|
|
This playbook uses a Postgres database name of `synapse` by default (controlled by the `matrix_synapse_database_database` variable).
|
|
If your database name differs, be sure to change `matrix_synapse_database_database` to your desired name and to re-run the playbook before proceeding.
|
|
|
|
The playbook supports importing Postgres dump files in **text** (e.g. `pg_dump > dump.sql`) or **gzipped** formats (e.g. `pg_dump | gzip -c > dump.sql.gz`).
|
|
|
|
Importing multiple databases (as dumped by `pg_dumpall`) is also supported.
|
|
|
|
Before doing the actual import, **you need to upload your Postgres dump file to the server** (any path is okay).
|
|
|
|
|
|
## Importing
|
|
|
|
To import, run this command (make sure to replace `<server-path-to-postgres-dump.sql>` with a file path on your server):
|
|
|
|
```sh
|
|
ansible-playbook -i inventory/hosts setup.yml \
|
|
--extra-vars='server_path_postgres_dump=<server-path-to-postgres-dump.sql>' \
|
|
--tags=import-postgres
|
|
```
|
|
|
|
**Note**: `<server-path-to-postgres-dump.sql>` must be a file path to a Postgres dump file on the server (not on your local machine!).
|
|
|
|
|
|
## Troubleshooting
|
|
|
|
A table ownership issue can occur if you are importing from a Synapse installation which was both:
|
|
|
|
- migrated from SQLite to Postgres, and
|
|
- used a username other than 'synapse'
|
|
|
|
In this case you may run into the following error during the import task:
|
|
|
|
```
|
|
"ERROR: role \"synapse_user\" does not exist"
|
|
```
|
|
|
|
where `synapse_user` is the database username from the previous Synapse installation.
|
|
|
|
This can be verified by examining the dump for ALTER TABLE statements which set OWNER TO that username:
|
|
|
|
```Shell
|
|
$ grep "ALTER TABLE" homeserver.sql"
|
|
ALTER TABLE public.access_tokens OWNER TO synapse_user;
|
|
ALTER TABLE public.account_data OWNER TO synapse_user;
|
|
ALTER TABLE public.account_data_max_stream_id OWNER TO synapse_user;
|
|
ALTER TABLE public.account_validity OWNER TO synapse_user;
|
|
ALTER TABLE public.application_services_state OWNER TO synapse_user;
|
|
...
|
|
```
|
|
|
|
It can be worked around by changing the username to `synapse`, for example by using `sed`:
|
|
|
|
```Shell
|
|
$ sed -i "s/synapse_user/synapse/g" homeserver.sql"
|
|
```
|
|
|
|
This uses sed to perform an 'in-place' (`-i`) replacement globally (`/g`), searching for `synapse user` and replacing with `synapse` (`s/synapse_user/synapse`). If your database username was different, change `synapse_user` to that username instead.
|
|
|
|
Note that if the previous import failed with an error it may have made changes which are incompatible with re-running the import task right away; if you do so it may fail with an error such as:
|
|
|
|
```
|
|
ERROR: relation \"access_tokens\" already exists
|
|
```
|
|
|
|
In this case you can use the command suggested in the import task to clear the database before retrying the import:
|
|
|
|
```Shell
|
|
# systemctl stop matrix-postgres
|
|
# rm -rf /matrix/postgres/data/*
|
|
# systemctl start matrix-postgres
|
|
```
|
|
|
|
Once the database is clear and the ownership of the tables has been fixed in the SQL file, the import task should succeed.
|