78 lines
3.0 KiB
Markdown
78 lines
3.0 KiB
Markdown
# `finallycoffee.services.restic`
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Ansible role for backup up data using `restic`, utilizing `systemd` timers for scheduling.
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## Overview
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As restic encrypts the data before storing it, the `restic_repo_password` needs
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to be populated with a strong key, and saved accordingly as only this key can
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be used to decrypt the data for a restore!
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### Backends
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#### S3 Backend
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To use a `s3`-compatible backend like AWS buckets or minio, both `restic_s3_key_id`
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and `restic_s3_access_key` need to be populated, and the `restic_repo_url` has the
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format `s3:https://my.s3.endpoint:port/bucket-name`.
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#### SFTP Backend
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Using the `sftp` backend requires the configured `restic_user` to be able to
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authenticate to the configured SFTP-Server using password-less methods like
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publickey-authentication. The `restic_repo_url` then follows the format
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`sftp:{user}@{server}:/my-restic-repository` (or without leading `/` for relative
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paths to the `{user}`s home directory.
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### Backing up data
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A job name like `$service-postgres` or similar needs to be set in `restic_job_name`,
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which is used for naming the `systemd` units, their syslog identifiers etc.
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If backing up filesystem locations, the paths need to be specified in
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`restic_backup_paths` as lists of strings representing absolute filesystem
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locations.
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If backing up f.ex. database or other data which is generating backups using
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a command like `pg_dump`, use `restic_backup_stdin_command` (which needs to output
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to `stdout`) in conjunction with `restic_backup_stdin_command_filename` to name
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the resulting output (required).
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### Policy
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The backup policy can be adjusted by overriding the `restic_policy_keep_*`
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variables, with the defaults being:
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```yaml
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restic_policy_keep_all_within: 1d
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restic_policy_keep_hourly: 6
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restic_policy_keep_daily: 2
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restic_policy_keep_weekly: 7
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restic_policy_keep_monthly: 4
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restic_policy_backup_frequency: hourly
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```
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**Note:** `restic_policy_backup_frequency` must conform to `systemd`s
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`OnCalendar` syntax, which can be checked using `systemd-analyze calender $x`.
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## Role behaviour
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Per default, when the systemd unit for a job changes, the job is not immediately
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started. This can be overridden using `restic_start_job_on_unit_change: true`,
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which will immediately start the backup job if it's configuration changed.
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The systemd unit runs with `restic_user`, which is root by default, guaranteeing
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that filesystem paths are always readable. The `restic_user` can be overridden,
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but care needs to be taken to ensure the user has permission to read all the
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provided filesystem paths / the backup command may be executed by the user.
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If ansible should create the user, set `restic_create_user` to `true`, which
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will attempt to create the `restic_user` as a system user.
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### Installing
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For Debian and RedHat, the role attempts to install restic using the default
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package manager's ansible module (apt/dnf). For other distributions, the generic
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`package` module tries to install `restic_package_name` (default: `restic`),
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which can be overridden if needed.
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