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119 lines
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ReStructuredText
119 lines
4.3 KiB
ReStructuredText
FAQ
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===
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This is the list of Frequently Asked Questions for restic.
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``restic check`` reports packs that aren't referenced in any index, is my repository broken?
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--------------------------------------------------------------------------------------------
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When ``restic check`` reports that there are pack files in the
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repository that are not referenced in any index, that's (in contrast to
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what restic reports at the moment) not a source for concern. The output
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looks like this:
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::
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$ restic check
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Create exclusive lock for repository
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Load indexes
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Check all packs
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pack 819a9a52e4f51230afa89aefbf90df37fb70996337ae57e6f7a822959206a85e: not referenced in any index
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pack de299e69fb075354a3775b6b045d152387201f1cdc229c31d1caa34c3b340141: not referenced in any index
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Check snapshots, trees and blobs
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Fatal: repository contains errors
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The message means that there is more data stored in the repo than
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strictly necessary. With high probability this is duplicate data. In
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order to clean it up, the command ``restic prune`` can be used. The
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cause of this bug is not yet known.
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How can I specify encryption passwords automatically?
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-----------------------------------------------------
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When you run ``restic backup``, you need to enter the passphrase on
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the console. This is not very convenient for automated backups, so you
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can also provide the password through the ``--password-file`` option, or one of
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the environment variables ``RESTIC_PASSWORD`` or ``RESTIC_PASSWORD_FILE``.
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A discussion is in progress over implementing unattended backups happens in
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:issue:`533`.
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.. important:: Be careful how you set the environment; using the env
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command, a `system()` call or using inline shell
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scripts (e.g. `RESTIC_PASSWORD=password restic ...`)
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might expose the credentials in the process list
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directly and they will be readable to all users on a
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system. Using export in a shell script file should be
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safe, however, as the environment of a process is
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`accessible only to that user`_. Please make sure that
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the permissions on the files where the password is
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eventually stored are safe (e.g. `0600` and owned by
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root).
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.. _accessible only to that user: https://security.stackexchange.com/questions/14000/environment-variable-accessibility-in-linux/14009#14009
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How to prioritize restic's IO and CPU time
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------------------------------------------
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If you'd like to change the **IO priority** of restic, run it in the following way
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::
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$ ionice -c2 -n0 ./restic -r /media/your/backup/ backup /home
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This runs ``restic`` in the so-called best *effort class* (``-c2``),
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with the highest possible priority (``-n0``).
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Take a look at the `ionice manpage`_ to learn about the other classes.
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.. _ionice manpage: https://linux.die.net/man/1/ionice
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To change the **CPU scheduling priority** to a higher-than-standard
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value, use would run:
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::
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$ nice --10 ./restic -r /media/your/backup/ backup /home
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Again, the `nice manpage`_ has more information.
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.. _nice manpage: https://linux.die.net/man/1/nice
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You can also **combine IO and CPU scheduling priority**:
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::
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$ ionice -c2 nice -n19 ./restic -r /media/gour/backup/ backup /home
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This example puts restic in the IO class 2 (best effort) and tells the CPU
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scheduling algorithm to give it the least favorable niceness (19).
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The above example makes sure that the system the backup runs on
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is not slowed down, which is particularly useful for servers.
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Creating new repo on a Synology NAS via sftp fails
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--------------------------------------------------
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Sometimes creating a new restic repository on a Synology NAS via sftp fails
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with an error similar to the following:
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::
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$ restic init -r sftp:user@nas:/volume1/restic-repo init
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create backend at sftp:user@nas:/volume1/restic-repo/ failed:
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mkdirAll(/volume1/restic-repo/index): unable to create directories: [...]
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Although you can log into the NAS via SSH and see that the directory structure
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is there.
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The reason for this behavior is that apparently Synology NAS expose a different
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directory structure via sftp, so the path that needs to be specified is
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different than the directory structure on the device and maybe even as exposed
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via other protocols.
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The following may work:
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::
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$ restic init -r sftp:user@nas:/restic-repo init
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