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more fixes to the upgrade guide

This commit is contained in:
Scott Lamb 2018-01-30 21:14:53 -08:00
parent 9a8ed69047
commit d192d98129
1 changed files with 9 additions and 6 deletions
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15
guide/schema.md
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@ -26,20 +26,23 @@ read-only mode prior to deleting the old database.
First ensure there is sufficient space available for four copies of the
SQLite database:
1. the primary copy, which will be upgraded
2. a copy you create manually as a backup so that you can restore if you
* copy 1: the copy to upgrade
* copy 2: a backup you manually create so that you can restore if you
discover a problem while running the new software against the upgraded
database in read-only mode. If disk space is tight, you can save this
to a different filesystem than the primary copy.
3. internal copies made and destroyed by Moonfire NVR and SQLite during the
upgrade:
* copies 3 and 4: internal copies made and destroyed by Moonfire NVR and
SQLite during the upgrade:
* during earlier steps, possibly duplicate copies of tables, which
may occupy space both in the main database and the journal
* during the final vacuum step, a complete database copy
If disk space is tight, and you are _very careful_, you can skip these
copies with the `--preset-journal=off --no-vacuum` arguments to
the updater. If you aren't confident in your ability to do this, *don't
do it*. If you are confident, take additional safety precautions anyway:
* double-check you have the full backup described above. Without the
journal any problems during the upgrade will corrupt your database
and you will need to restore.
@ -84,11 +87,11 @@ Run the upgrade procedure using the new software binary (here referred to as
`new-moonfire-nvr`; if you are installing from source, you may find it as
`target/release/moonfire-nvr`).
$ sudo -u moonfire-nvr new-moonfire-nvr --upgrade
$ sudo -u moonfire-nvr new-moonfire-nvr upgrade
Then run the system in read-only mode to verify correct operation:
$ sudo -u moonfire-nvr new-moonfire-nvr --read-only
$ sudo -u moonfire-nvr new-moonfire-nvr run --read-only
Go to the web interface and ensure the system is operating correctly. If
you detect a problem now, you can copy the old database back over the new one.