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rsnapshot

Table of Contents

  1. Overview
  2. Module Description
  3. Differences between this and other modules
  4. Setup - The basics of getting started with rsnapshot
  5. Usage - Configuration options and additional functionality
  6. Reference
  7. Resources
  8. Development

Overview

This module manages backups using rsnapshot automatically.

Module Description

This module is a fork of tedivm/rsnapshot, and has many enhancements, including:

  • Puppet 7 Compatible
  • Tested on all major/modern Debian and Red Hat derivatives
  • Fully automatic, including root user SSH key generation
  • 1 parameter required for clients: backup server FQDN
  • Pre/Post Commands (credit: https://github.com/tedivm/puppet-rsnapshot/compare/master...twc-openstack:master)
  • CRON redesigned to run from first to last server continuously during the backup window
  • Sane defaults: 10pm nightly, 10am Sunday weekly, and 8am on the first of the Monthly

Working Puppet Master and PuppetDB assumed for all automated functionality.

rsnapshot is a filesystem snapshot utility based on rsync. rsnapshot makes it easy to make periodic snapshots of local machines, and remote machines over ssh. The code makes extensive use of hard links whenever possible, to greatly reduce the disk space required.

This module installs and configures the rsnapshot module, which is a backup tool that utilizes rsync to create fast incremental backups as well as a hardlink system which makes all incremental backups work as full ones.

This module makes it easy to manage a backup server based off of rsnapshot while utilizing common Puppet patterns.

Differences between this and other modules.

  • Fully automatic client/server deployment with sensible defaults. The only required parameter is to tell the client which server to backup to.

  • Support all recent mainstream Operating Systems and Puppet Client. Latest Debian, Ubuntu, CentOS and Fedora using Puppet 5+

  • Ability to run pre and post commands. Credit to 'https://github.com/twc-openstack/puppet-rsnapshot' for the contribution, allowing 'pre' and 'post' commands to be run.

  • Automatic creation of root SSH key if it doesn't exist.

  • CRON Tasks run contiguously, one after the other, to facilitate a true 'backup window' Defaults to 10pm nightly, Sunday 10am for weekly and the first of the month at 8am for monthly.

  • Support for SSH without root access. In most cases root login is not available over ssh for security reasons, so this module relies instead on having it's own unique user with restricted sudo access to give it the needed access to perform backups.

  • Support for automatic key sharing. The client machine will automatically receive the ssh key from the server and user that it is backing up to. This uses concat and the facter fact for sshkeys from jtopjian-sshkeys module.

  • Locked down ssh accounts. All ssh accounts are locked down. SSH keys can only by used by the single backup host, without access to unneeded features like x-forwarding. Commands allowed by the ssh key are limited to specific wrapper scripts installed by this module.

  • Sender only rsync. One of the biggest threats with rsync access is the potential to overwrite existing files on the system to gain unauthorized access. This module uses a wrapper script around rsync on the client side to make it a read only user.

Setup

What rsnapshot affects

  • Installs rsync and rsnapshot on server machine.
  • Installs rsync on client machine.
  • Creates rsnapshot configuration files for each client on the server machine.
  • Creates CRON jobs for each backup routine (hourly, daily, weekly, monthly).
  • Installs wrapper scripts on the client machine to improve security.
  • Creates directory for storing backups on the server.
  • Creates an ssh key pair on the server if needed.
  • Transfers SSH public key from server to client to enable ssh login.
  • Creates backup user and group on client machine.
  • Adds backup user to sudo.

Setup Requirements

  • PuppetDB needs to be installed for SSH keys to automatically transfer.
  • Storeconfigs needs to be enabled for configurations defined on the client side to be installed on the backup server.
  • Multiple puppet runs (client, then server, then client again) need to occur for all resources to be created on both servers.

Beginning with rsnapshot

On the backup server (backups.example.com) include the rsnapshot::server class and tell it where to store the backups.

class { 'rsnapshot::server': }

On the machine you want to back up include the rsnapshot::client class and tell it which server to back up to and what directories to back up.

class { 'rsnapshot::client':
  server      => 'backups.example.com',
}

That's it! A secure backup user will be created on the client, with the appropriate user, ssh key, and permissions, and that machine will get it's configuration pushed to the backup server.

Usage

Configuring the Server

Settings in the server class are passed to all backup configurations that end up on that server.

This class can be included without any parameters and the defaults should work.

class { 'rsnapshot::server':
  config_path            => '/etc/rsnapshot',
  backup_path            => '/backups/rsnapshot',
  log_path               => '/var/log/rsnapshot',
  user                   => 'root',
  no_create_root         => 0,
  verbose                => 2,
  log_level              => 3,
  link_dest              => 1,
  sync_first             => 0,
  use_lazy_deletes       => 0,
  rsync_numtries         => 1,
  stop_on_stale_lockfile => 0,
  du_args                => '-csh'
}

Configuring the Client

Settings in the client class are specific to that one client node. The parameters in this class will get exported to a backup server and merged with it's parameters to build the client specific configuration.

This class has 1 required parameter- the backup server, which should be an fqdn, and an optional parameter for an array of directories to back up. Additional options, such as retain rules can be overridden as needed.

When the retain values are set to zero, no cron entry for that specific period is created.

class { 'rsnapshot::client':
  server             => 'backups.example.com',
  directories        => [
    '/etc',
    '/home',
    '/root'
  ],
  user                => 'rsnapshot',
  remote_user         => 'root',
  backup_hourly_cron  => '0',
  backup_time_minute  => '0',
  backup_time_hour    => '10',
  backup_time_weekday => 0,
  backup_time_dom     => 1,
  cmd_preexec         => undef,
  cmd_postexec        => undef,
  cmd_client_rsync    => '/usr/bin/rsync',
  cmd_client_sudo     => '/usr/bin/sudo',
  retain_hourly       => 0,
  retain_daily        => 14,
  retain_weekly       => 8,
  retain_monthly      => 2,
  one_fs              => undef,
  rsync_short_args    => '-a',
  rsync_long_args     => '--delete --numeric-ids --relative --delete-excluded'
  ssh_args            => undef,
  use_sudo            => true,
  setup_sudo          => true,
  push_ssh_key        => true,
  wrapper_path        => '/opt/rsnapshot_wrappers/',
}

Back Up Pre and Post Actions

When backing up clients hosting services like databases, you may want to run a script to snapshot or quiesce the service. You can do this by specifying pre or post wrapper actions. These will be run on the client immediately before or after the rsync operation.

For example, to export the contents of the puppetdb database before running a backup of your puppetmaster:

class profiles::puppetmaster {
  rsnapshot::client {
    cmd_wrapper_preexec  => ['/usr/sbin/puppetdb export -o /root/puppetdb.export --port 8083'],
    cmd_wrapper_postexec => ['rm -f /root/puppetdb.export'],
  }
}

Reference

Public Classes

Defines

Private Classes

  • rsnapshot::client::install: Installs needed packages on client side.
  • rsnapshot::client::user: Sets up client side user and permissions.
  • rsnapshot::client::wrappers: Adds wrapper scripts to client machine.
  • rsnapshot::server::cron_script: Adds a shell script wrapper to backup machines one at a time and associated CRON tasks.
  • rsnapshot::server::install: Installs needed packages on server side.
  • rsnapshot::params Contains default parameters used by this module.

Private Defines

  • rsnapshot::server::backup_config: Gets thrown and collected by the backup and config types.

Bugs & New Features

If you happen to stumble upon a bug, please feel free to create a pull request with a fix (optionally with a test), and a description of the bug and how it was resolved.

Or if you're not into coding, simply create an issue adding steps to let us reproduce the bug and we will happily fix it.

If you have a good idea for a feature or how to improve this module in general, please create an issue to discuss it. We are very open to feedback. Pull requests are always welcome.

License

The project is released under the permissive MIT license.

The source can be found at github.com/Veeps-Hosting/puppet-rsnapshot.