mirror of
https://github.com/zrepl/zrepl.git
synced 2024-11-28 19:34:58 +01:00
95 lines
3.4 KiB
ReStructuredText
95 lines
3.4 KiB
ReStructuredText
.. include:: ../global.rst.inc
|
|
|
|
.. _quickstart-continuous-replication:
|
|
|
|
Continuous Backup of a Server
|
|
=============================
|
|
|
|
This config example shows how we can backup our ZFS-based server to another machine using a zrepl push job.
|
|
|
|
* Production server ``prod`` with filesystems to back up:
|
|
|
|
* ``zroot/var/db``
|
|
* ``zroot/usr/home`` and all its child filesystems
|
|
* **except** ``zroot/usr/home/paranoid`` belonging to a user doing backups themselves
|
|
|
|
* Backup server ``backups`` with
|
|
|
|
* Filesystem ``storage/zrepl/sink/prod`` + children dedicated to backups of ``prod``
|
|
|
|
Our backup solution should fulfill the following requirements:
|
|
|
|
* Periodically snapshot the filesystems on ``prod`` *every 10 minutes*
|
|
* Incrementally replicate these snapshots to ``storage/zrepl/sink/prod/*`` on ``backups``
|
|
* Keep only very few snapshots on ``prod`` to save disk space
|
|
* Keep a fading history (24 hourly, 30 daily, 6 monthly) of snapshots on ``backups``
|
|
* The network is untrusted - zrepl should use TLS to protect its communication and our data.
|
|
|
|
Analysis
|
|
--------
|
|
|
|
We can model this situation as two jobs:
|
|
|
|
* A **push job** on ``prod``
|
|
|
|
* Creates the snapshots
|
|
* Keeps a short history of local snapshots to enable incremental replication to ``backups``
|
|
* Connects to the ``zrepl daemon`` process on ``backups``
|
|
* Pushes snapshots ``backups``
|
|
* Prunes snapshots on ``backups`` after replication is complete
|
|
|
|
* A **sink job** on ``backups``
|
|
|
|
* Accepts connections & responds to requests from ``prod``
|
|
* Limits client ``prod`` access to filesystem sub-tree ``storage/zrepl/sink/prod``
|
|
|
|
Generate TLS Certificates
|
|
-------------------------
|
|
|
|
We use the :ref:`TLS client authentication transport <transport-tcp+tlsclientauth>` to protect our data on the wire.
|
|
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>`.
|
|
For convenience, we generate the key pairs on our local machine and distribute them using ssh:
|
|
|
|
.. code-block:: bash
|
|
|
|
(name=backups; openssl req -x509 -sha256 -nodes \
|
|
-newkey rsa:4096 \
|
|
-days 365 \
|
|
-keyout $name.key \
|
|
-out $name.crt -addext "subjectAltName = DNS:$name" -subj "/CN=$name")
|
|
|
|
(name=prod; openssl req -x509 -sha256 -nodes \
|
|
-newkey rsa:4096 \
|
|
-days 365 \
|
|
-keyout $name.key \
|
|
-out $name.crt -addext "subjectAltName = DNS:$name" -subj "/CN=$name")
|
|
|
|
ssh root@backups "mkdir /etc/zrepl"
|
|
scp backups.key backups.crt prod.crt root@backups:/etc/zrepl
|
|
|
|
ssh root@prod "mkdir /etc/zrepl"
|
|
scp prod.key prod.crt backups.crt root@prod:/etc/zrepl
|
|
|
|
Note that alternative transports exist, e.g. via :ref:`TCP without TLS <transport-tcp>` or :ref:`ssh <transport-ssh+stdinserver>`.
|
|
|
|
Configure server ``prod``
|
|
-------------------------
|
|
|
|
We define a **push job** named ``prod_to_backups`` in ``/etc/zrepl/zrepl.yml`` on host ``prod`` :
|
|
|
|
.. literalinclude:: ../../config/samples/quickstart_continuous_server_backup_sender.yml
|
|
|
|
.. _tutorial-configure-prod:
|
|
|
|
Configure server ``backups``
|
|
----------------------------
|
|
|
|
We define a corresponding **sink job** named ``sink`` in ``/etc/zrepl/zrepl.yml`` on host ``backups`` :
|
|
|
|
.. literalinclude:: ../../config/samples/quickstart_continuous_server_backup_receiver.yml
|
|
|
|
Go Back To Quickstart Guide
|
|
---------------------------
|
|
|
|
:ref:`Click here <quickstart-apply-config>` to go back to the quickstart guide.
|