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Update importing-postgres.md with individual DB and repeat-import information (#1437) 

* Update importing-postgres.md

Additional deatails, mostly on repeating import. Structure troubleshouting section.

* Update importing-postgres.md

removing -K

* Fix path typo

Co-authored-by: Slavi Pantaleev <slavi@devture.com>
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felixx9 2021-12-05 09:41:00 +01:00 committed by GitHub
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docs/importing-postgres.md
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@ -12,7 +12,8 @@ If your database name differs, be sure to change `matrix_synapse_database_databa
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.
Importing multiple databases (as dumped by `pg_dumpall`) is also supported.
But the migration might be a good moment, to "reset" a not properly working bridge. Be aware, that it might affect all users (new link to bridge, new roomes, ...)
Before doing the actual import, **you need to upload your Postgres dump file to the server** (any path is okay).
@ -32,6 +33,7 @@ ansible-playbook -i inventory/hosts setup.yml \
## Troubleshooting
### Table Ownership
A table ownership issue can occur if you are importing from a Synapse installation which was both:
- migrated from SQLite to Postgres, and
@ -71,6 +73,8 @@ Note that if the previous import failed with an error it may have made changes w
ERROR: relation \"access_tokens\" already exists
```
### Repeat import
In this case you can use the command suggested in the import task to clear the database before retrying the import:
```Shell
@ -79,4 +83,20 @@ In this case you can use the command suggested in the import task to clear the d
# 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.
Now on your local machine run `ansible-playbook -i inventory/hosts setup.yml --tags=setup-postgres` to prepare the database roles etc.
If not, you probably get this error. `synapse` is the correct table owner, but the role is missing in database.
```
"ERROR: role synapse does not exist"
```
Once the database is clear and the ownership of the tables has been fixed in the SQL file, the import task should succeed.
Check, if `--dbname` is set to `synapse` (not `matrix`) and replace paths (or even better, copy this line from your terminal)
```
/usr/bin/env docker run --rm --name matrix-postgres-import --log-driver=none --user=998:1001 --cap-drop=ALL --network=matrix --env-file=/matrix/postgres/env-postgres-psql --mount type=bind,src=/migration/synapse_dump.sql,dst=/synapse_dump.sql,ro --entrypoint=/bin/sh docker.io/postgres:14.1-alpine -c "cat /synapse_dump.sql | grep -vE '^(CREATE|ALTER) ROLE (matrix)(;| WITH)' | grep -vE '^CREATE DATABASE (matrix)\s' | psql -v ON_ERROR_STOP=1 -h matrix-postgres --dbname=synapse"
```
### Hints
To open psql terminal run `/usr/local/bin/matrix-postgres-cli`