Mondoarchive Exclude List Failures

To illustrate config files in sh scripts, I published my mondoarchive script. That script dynamically builds an mondo exclude list from a list of directories inside a file.

Since I published that article, many of you have arrived here after Googling mondoarchive exclude lists. It seems they’re failing you. Fear not, faithful Googlers. Your JoeDog has experienced this pain and he can help.

There are two main problems with mondoarchive exclude lists that causes the program to ignore them. One is documentation and the other is a bug.

Older versions of mondoarchive use space separated exclude lists. You construct them like this:

  -E "/usr/src /data/archive /usr/local/src"

Since version 2.2.9.5 the syntax has changed for both -E and -I. Whereas older versions used space separated lists of directories, newer versions use pipe separated directories. If you have a newer version, construct your lists like this:

  -E "/usr/src|/data/archive|/usr/local/src"

The other problem I’ve encountered appears to be a bug. The first directory in my exclude list wasn’t being excluded. To fix that problem, I’ve placed /tmp first in all my exclude lists.

  -E "/tmp|/usr/src|/data/archive|/usr/local/src"

Problem “solved.”

Posted in Mondorescue | 1 Comment



Creating Config Files For sh Scripts

Your JoeDog uses mondorescue for bare-metal Linux restoration. We use mondorestore to recover the OS and Net Backup to recover its content. Since we’re only concerned about archiving the OS for bare-metal recovery, it’s necessary to exclude directories when we run mondoarchive.

My exclude requirement varies from server to server so I wanted to build the list dynamically. As a coder, I have religious aversion to altering scripts for the purpose of configuring them. If we set config variables inside the script, then we have a different version on every server. That’s a paddlin’.

For my mondoarchive script, I developed a pretty slick way to read a configuration file and build an exclude list. The list is configured in a conf file that ignores comment lines and superfluous white space. A typical configuration looks like this:

#
# This file is maintained by the Puppet Master 
# 
# This is the exclude list for mondoarchive Directories inside
# this list will not be archived for bare metal recovery.
#
/tmp
/export
/usr/src
/var/mail
/var/cache
/var/log

My mondoarchive script builds a string of pipe separated directories like this:

/tmp|/export|/usr/src|/var/mail|/var/cache|/var/log

Since very few of you will have a similar usecase, I wrote an example that reads the file into a sh array. This version will loop through the array and print each one.

#!/bin/sh
# An example script that reads a list from a config
# file into a sh script array.
CONF="haha.conf"
LIST=""
#
# Read the directory list from $CONF
if [[ -e $CONF ]] ; then
  while read line ; do
    chr=${line:0:1}
    # XXX: Use awk's substr on older systems like
    # HPUX which don't support the above syntax.
    # chr=$(echo $line | awk '{print substr($1,0,1)}')
    case $chr in
     '#')
       # ignore comments
       ;;
     *)
       if [[ ${#line} -gt 2 ]] ; then
         if [[ -z $LIST ]] ; then
           LIST="$line"
         else
         LIST="$LIST $line"
         fi
       fi
       ;;
    esac
  done < $CONF
else
  echo "$0: [error] unable to locate $CONF"
fi
let X=1
for I in $LIST ; do
  echo "$X: $I"
  let X=$X+1
done

Let’s run this bad boy and see what happens:

$ sh haha
1: /tmp
2: /etc
3: /usr/local
4: /data/mrepo

If some of the concepts listed don’t make sense, then you might want to see our sh scripting cheat sheet. It will help you understand things like ‘-e $CONF’ and sh script arrays. Happy hacking.

UPDATE: Given the introduction to this post, it’s likely that many of you have arrived here in search of a mondoarchive backup script. Well, we won’t let you leave empty handed. You can grab my archive script here: Mondo Rescue Archive Script

This script builds both NFS recoverable archives and DVD images to an NFS mounted volume. Here’s its usage banner:

Usage: archiver [-c|-n]
Requires either a '-c' or a '-n' argument
  -c      create a CD Rom archive
  -n      create an NFS archive

Posted in Mondorescue, Programming, sh | 1 Comment