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95 lines
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ReStructuredText
95 lines
3.4 KiB
ReStructuredText
.. include:: ../global.rst.inc
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.. _quickstart-continuous-replication:
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Continuous Backup of a Server
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=============================
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This config example shows how we can backup our ZFS-based server to another machine using a zrepl push job.
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* Production server ``prod`` with filesystems to back up:
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* ``zroot/var/db``
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* ``zroot/usr/home`` and all its child filesystems
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* **except** ``zroot/usr/home/paranoid`` belonging to a user doing backups themselves
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* Backup server ``backups`` with
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* Filesystem ``storage/zrepl/sink/prod`` + children dedicated to backups of ``prod``
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Our backup solution should fulfill the following requirements:
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* Periodically snapshot the filesystems on ``prod`` *every 10 minutes*
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* Incrementally replicate these snapshots to ``storage/zrepl/sink/prod/*`` on ``backups``
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* Keep only very few snapshots on ``prod`` to save disk space
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* Keep a fading history (24 hourly, 30 daily, 6 monthly) of snapshots on ``backups``
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* The network is untrusted - zrepl should use TLS to protect its communication and our data.
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Analysis
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--------
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We can model this situation as two jobs:
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* A **push job** on ``prod``
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* Creates the snapshots
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* Keeps a short history of local snapshots to enable incremental replication to ``backups``
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* Connects to the ``zrepl daemon`` process on ``backups``
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* Pushes snapshots ``backups``
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* Prunes snapshots on ``backups`` after replication is complete
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* A **sink job** on ``backups``
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* Accepts connections & responds to requests from ``prod``
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* Limits client ``prod`` access to filesystem sub-tree ``storage/zrepl/sink/prod``
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Generate TLS Certificates
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-------------------------
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We use the :ref:`TLS client authentication transport <transport-tcp+tlsclientauth>` to protect our data on the wire.
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To get things going quickly, we skip setting up a CA and generate two self-signed certificates as described :ref:`here <transport-tcp+tlsclientauth-2machineopenssl>`.
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For convenience, we generate the key pairs on our local machine and distribute them using ssh:
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.. code-block:: bash
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(name=backups; openssl req -x509 -sha256 -nodes \
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-newkey rsa:4096 \
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-days 365 \
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-keyout $name.key \
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-out $name.crt -addext "subjectAltName = DNS:$name" -subj "/CN=$name")
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(name=prod; openssl req -x509 -sha256 -nodes \
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-newkey rsa:4096 \
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-days 365 \
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-keyout $name.key \
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-out $name.crt -addext "subjectAltName = DNS:$name" -subj "/CN=$name")
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ssh root@backups "mkdir /etc/zrepl"
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scp backups.key backups.crt prod.crt root@backups:/etc/zrepl
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ssh root@prod "mkdir /etc/zrepl"
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scp prod.key prod.crt backups.crt root@prod:/etc/zrepl
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Note that alternative transports exist, e.g. via :ref:`TCP without TLS <transport-tcp>` or :ref:`ssh <transport-ssh+stdinserver>`.
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Configure server ``prod``
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-------------------------
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We define a **push job** named ``prod_to_backups`` in ``/etc/zrepl/zrepl.yml`` on host ``prod`` :
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.. literalinclude:: ../../config/samples/quickstart_continuous_server_backup_sender.yml
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.. _tutorial-configure-prod:
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Configure server ``backups``
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----------------------------
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We define a corresponding **sink job** named ``sink`` in ``/etc/zrepl/zrepl.yml`` on host ``backups`` :
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.. literalinclude:: ../../config/samples/quickstart_continuous_server_backup_receiver.yml
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Go Back To Quickstart Guide
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---------------------------
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:ref:`Click here <quickstart-apply-config>` to go back to the quickstart guide.
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