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Added new (asciidoc) documentation
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doc/ccollect.text
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ccollect - Installing, Configuring and Using
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============================================
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Nico Schottelius <nico-linux-ccollect__@__schottelius.org>
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v0.1, 2005-01-11
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:Author Initials: NS
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(pseudo) incremental backup
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with different exclude lists
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using hardlinks and `rsync`
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Introduction
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------------
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ccollect is a backup utitily written in the sh-scripting language.
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It does not depend on a specific shell, only `/bin/sh` needs to be
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bourne shell compatibel (like 'dash', 'zsh' or 'bash').
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Why you can only backup TO localhost
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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While thinking about the design of ccollect, I thought about enabling
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backup to *remote* hosts. Though this sounds like a nice feature
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('Backup my notebook to the server now.'), it is in my opinion a
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bad idea to backup to a remote host, because you have to open
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security at your backup host. Think of the following situation: You backup
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your farm of webservers *to* a backup host somewhere else. One of
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your webservers gets compromised, then your backup server will be compromised,
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too. Think of it the other way round: The backup server (now behind a
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firewall using NAT and strong firewall rules) connects to the
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webservers and pulls the data to it. If someone gets access to the
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webserver, the person will perhaps not even see your machine. If
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he/she sees that there are connections from a host to the compromised
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machine, he/she will not be able to login to the backup machine.
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All other backups are still secure.
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Requirements
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------------
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Installing ccollect
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~~~~~~~~~~~~~~~~~~~
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For the installation, you need at least
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- either 'cp' and 'chmod' or 'install
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- for more comfort: 'make'
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- for rebuilding the generated documentation: additionally 'asciidoc'
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Using ccollect
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~~~~~~~~~~~~~~
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.When running ccollect, it requires the following tools installed:
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- `bc`
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- `cp` with support for hard links ('cp -al')
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- `rsync`
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- `ssh` (if you want to use rsync over ssh, which is recommened for security)
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Installing
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----------
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Either type 'make install' or simply copy it to a directory in your
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$PATH and execute 'chmod *0755* /path/to/ccollect.sh'.
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Configuring
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-----------
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Runtime options
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~~~~~~~~~~~~~~~
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`ccollect` looks for its configuration in '/etc/ccollect' or, if set, in
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the directory specified by the variable '$CCOLLECT_CONF'
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(use 'CCOLLECT_CONF=/your/config/dir ccollect.sh' on the shell).
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When you start `ccollect`, you have either to specify which intervall
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to backup (daily, weekly, yearly; you can specify the names yourself, see below).
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The intervall is used to specify how many backups to keep.
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There are also some self explaining parameters you can pass to ccollect, simply use
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"ccollect.sh --help" for info.
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General configuration
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~~~~~~~~~~~~~~~~~~~~~
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The general configuration can be found below $CCOLLECT_CONF/defaults or
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/etc/ccollect/defaults. All options specified here are generally valid for
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all source definitions. Though the values can be overwritten in the source
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configuration.
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All configuration entries are plain-text (use UTF-8 if you use
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non ASCII characters) files.
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Intervall definition
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^^^^^^^^^^^^^^^^^^^^
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The intervall definition can be found below
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'$CCOLLECT_CONF/defaults/intervalls/' or '/etc/ccollect/defaults/intervalls'.
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Every file below this directory specifies an intervall. The name of the file is the
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name of the intervall: `intervalls/'<intervall name>'`.
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The content of this file should be a single line containing a number.
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This number defines how many versions of this intervall to keep.
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Example:
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-------------------------------------------------------------------------
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[10:23] zaphodbeeblebrox:ccollect-0.2% ls -l conf/defaults/intervalls/
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insgesamt 12
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-rw-r--r-- 1 nico users 3 2005-12-08 10:24 daily
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-rw-r--r-- 1 nico users 3 2005-12-08 11:36 monthly
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-rw-r--r-- 1 nico users 2 2005-12-08 11:36 weekly
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[10:23] zaphodbeeblebrox:ccollect-0.2% cat conf/defaults/intervalls/*
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28
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12
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4
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--------------------------------------------------------------------------------
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This means to keep 28 daily backups, 12 monthly backups and 4 weekly.
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Source configuration
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~~~~~~~~~~~~~~~~~~~~
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Each source configuration exists below '$CCOLLECT_CONF/sources/$name' or
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'/etc/ccollect/sources/$name'.
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The name you choose for the subdirectory describes the source.
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Each source has at least the following files:
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- `source` (a text file containing the rsync compatible path to backup)
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- `destination` (a link to the directory we should backup to)
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Additionally a source may have the following files:
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- `verbose` whether to be verbose (passes -v to rsync)
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- `exclude` exclude list for rsync. One exclude specification on each line.
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Example:
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--------------------------------------------------------------------------------
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[10:47] zaphodbeeblebrox:ccollect-0.2% ls -l conf/sources/testsource2
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insgesamt 12
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lrwxrwxrwx 1 nico users 20 2005-11-17 16:44 destination -> /home/nico/backupdir
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-rw-r--r-- 1 nico users 62 2005-12-07 17:43 exclude
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drwxr-xr-x 2 nico users 4096 2005-12-07 17:38 intervalls
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-rw-r--r-- 1 nico users 15 2005-11-17 16:44 source
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[10:47] zaphodbeeblebrox:ccollect-0.2% cat conf/sources/testsource2/exclude
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openvpn-2.0.1.tar.gz
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nicht_reinnehmen
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etwas mit leerzeichenli
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[10:47] zaphodbeeblebrox:ccollect-0.2% ls -l conf/sources/testsource2/intervalls
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insgesamt 4
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-rw-r--r-- 1 nico users 2 2005-12-07 17:38 daily
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[10:48] zaphodbeeblebrox:ccollect-0.2% cat conf/sources/testsource2/intervalls/daily
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5
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[10:48] zaphodbeeblebrox:ccollect-0.2% cat conf/sources/testsource2/source
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/home/nico/vpn
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--------------------------------------------------------------------------------
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Detailled description of "source"
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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`source` describes a rsync compatible source (one line only).
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For instance 'backup_user@foreign_host:/home/server/video'.
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To use the rsync protocol without the ssh-tunnel, use
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'rsync::USER@HOST/SRC'. For more information have a look at rsync(1).
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Detailled description of "verbose"
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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`verbose` tells `ccollect` that the log should contain verbose messages.
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If this file exists in the source specification *-v* will be passed to `rsync`.
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Example:
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--------------------------------------------------------------------------------
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[11:35] zaphodbeeblebrox:ccollect-0.2% touch conf/sources/testsource1/verbose
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--------------------------------------------------------------------------------
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Detailled description of "exclude"
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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`exclude` specifies a list of paths to exclude. The entries are new line (\n)
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seperated.
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Example:
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--------------------------------------------------------------------------------
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[11:35] zaphodbeeblebrox:ccollect-0.2% cat conf/sources/testsource2/exclude
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openvpn-2.0.1.tar.gz
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nicht_reinnehmen
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etwas mit leerzeichenli
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something with spaces is not a problem
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--------------------------------------------------------------------------------
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Detailled description of "destination"
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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`destination` must be a link to the destination directory.
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Example:
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--------------------------------------------------------------------------------
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[11:36] zaphodbeeblebrox:ccollect-0.2% ls -l conf/sources/testsource2/destination
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lrwxrwxrwx 1 nico users 20 2005-11-17 16:44 conf/sources/testsource2/destination -> /home/nico/backupdir
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--------------------------------------------------------------------------------
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Detailled description of "intervalls/"
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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When you create a subdirectory `intervalls/` within your source configuration
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directory, you can specify individiual intervalls for this specific source.
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Each file below this directory describes an intervall.
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Example:
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--------------------------------------------------------------------------------
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[11:37] zaphodbeeblebrox:ccollect-0.2% ls -l conf/sources/testsource2/intervalls/
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insgesamt 8
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-rw-r--r-- 1 nico users 2 2005-12-07 17:38 daily
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-rw-r--r-- 1 nico users 3 2005-12-14 11:33 yearly
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[11:37] zaphodbeeblebrox:ccollect-0.2% cat conf/sources/testsource2/intervalls/*
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5
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20
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--------------------------------------------------------------------------------
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Examples
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--------
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A backup host configuration from scratch
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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--------------------------------------------------------------------------------
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srwali01:~# mkdir /etc/ccollect
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srwali01:~# mkdir -p /etc/ccollect/defaults/intervalls/
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srwali01:~# echo 28 > /etc/ccollect/defaults/intervalls/taeglich
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srwali01:~# echo 52 > /etc/ccollect/defaults/intervalls/woechentlich
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srwali01:~# cd /etc/ccollect/
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srwali01:/etc/ccollect# mkdir sources
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srwali01:/etc/ccollect# cd sources/
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srwali01:/etc/ccollect/sources# ls
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srwali01:/etc/ccollect/sources# mkdir local-root
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srwali01:/etc/ccollect/sources# cd local-root/
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srwali01:/etc/ccollect/sources/local-root# echo / > source
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srwali01:/etc/ccollect/sources/local-root# cat > exclude << EOF
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> /proc
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> /sys
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> /mnt
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> EOF
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srwali01:/etc/ccollect/sources/local-root# ln -s /mnt/hdbackup/local-root destination
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srwali01:/etc/ccollect/sources/local-root# mkdir /mnt/hdbackup/local-root
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srwali01:/etc/ccollect/sources/local-root# ccollect.sh taeglich local-root
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/o> ccollect.sh: Beginning backup using intervall taeglich
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/=> Beginning to backup "local-root" ...
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|-> 0 backup(s) already exist, keeping 28 backup(s).
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--------------------------------------------------------------------------------
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After that, I added some more sources:
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--------------------------------------------------------------------------------
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srwali01:~# cd /etc/ccollect/sources
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srwali01:/etc/ccollect/sources# mkdir windos-wl6
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srwali01:/etc/ccollect/sources# cd windos-wl6/
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srwali01:/etc/ccollect/sources/windos-wl6# echo /mnt/win/SYS/WL6 > source
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srwali01:/etc/ccollect/sources/windos-wl6# ln -s /mnt/hdbackup/wl6 destination
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srwali01:/etc/ccollect/sources/windos-wl6# mkdir /mnt/hdbackup/wl6
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srwali01:/etc/ccollect/sources/windos-wl6# cd ..
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srwali01:/etc/ccollect/sources# mkdir windos-daten
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srwali01:/etc/ccollect/sources/windos-daten# echo /mnt/win/Daten > source
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srwali01:/etc/ccollect/sources/windos-daten# ln -s /mnt/hdbackup/windos-daten destination
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srwali01:/etc/ccollect/sources/windos-daten# mkdir /mnt/hdbackup/windos-daten
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# Now add some remote source
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srwali01:/etc/ccollect/sources/windos-daten# cd ..
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srwali01:/etc/ccollect/sources# mkdir srwali03
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srwali01:/etc/ccollect/sources# cd srwali03/
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srwali01:/etc/ccollect/sources/srwali03# cat > exclude << EOF
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> /proc
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> /sys
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> /mnt
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> /home
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> EOF
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srwali01:/etc/ccollect/sources/srwali03# echo 'root@10.103.2.3:/' > source
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srwali01:/etc/ccollect/sources/srwali03# ln -s /mnt/hdbackup/srwali03 destination
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srwali01:/etc/ccollect/sources/srwali03# mkdir /mnt/hdbackup/srwali03
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--------------------------------------------------------------------------------
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Using hard-links requires less disk space
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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-------------------------------------------------------------------------
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[10:53] srsyg01:sources% du -sh ~/backupdir
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4.6M /home/nico/backupdir
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[10:53] srsyg01:sources% du -sh ~/backupdir/*
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4.1M /home/nico/backupdir/daily.2005-12-08-10:52.28456
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4.1M /home/nico/backupdir/daily.2005-12-08-10:53.28484
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4.1M /home/nico/backupdir/daily.2005-12-08-10:53.28507
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4.1M /home/nico/backupdir/daily.2005-12-08-10:53.28531
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4.1M /home/nico/backupdir/daily.2005-12-08-10:53.28554
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4.1M /home/nico/backupdir/daily.2005-12-08-10:53.28577
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srwali01:/etc/ccollect/sources# du -sh /mnt/hdbackup/wl6/
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186M /mnt/hdbackup/wl6/
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srwali01:/etc/ccollect/sources# du -sh /mnt/hdbackup/wl6/*
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147M /mnt/hdbackup/wl6/taeglich.2005-12-08-14:42.312
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147M /mnt/hdbackup/wl6/taeglich.2005-12-08-14:45.588
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-------------------------------------------------------------------------
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