Bash::Scripts - rotatelogs.sh

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Rotiert Logfiles in einem Verzeichnis und verwendet eine Konfigurationsdatei, in der fuer jedes Logfile gespeichert ist, nach wie vielen Tagen es umkopiert wird. Format der Contig-Datei: logfilename=dauer Dauer in Tagen. Taucht ein Logfile nicht auf ist dauer=7 Tage. Hier eine Beispiel Konfiguration.

# **********************************************************
# file: rotatelogs.cfg
# date: 2005-02-16
# author: Marko Schulz - <mschulz@jamba.net>
# dascription: config file for rotatelogs.sh - Format:
#
# name=duration	# (days)
#
# name is any filename in $logdir.
# **********************************************************

tomcat.log=5
apache.log=1
# Anything with a duration of zero is not rotated
rotatelogs.log=0

Snippet
Information

rotatelogs.sh

```
#!/bin/bash
```

# **********************************************************

```
# file: rotatelogs.sh
```
```
# date: 2005-02-16
```

# author: Marko Schulz - <mschulz@jamba.net>

```
#
```

# Rotiert Logfiles in einem Verzeichnis (z.B. /var/log).

# Verwendet eine Konfigurationsdatei, in der fuer jedes Logfile

# gespeichert ist, nach wie vielen Tagen es umkopiert wird.

# Format der Contig-Datei: logfilename=dauer Dauer in Tagen.

# Taucht ein Logfile nicht auf ist dauer=7 Tage.

# **********************************************************

```
 
```

# Fehler per Mail senden (on=>ja/off=>nein)...

```
notify="on"
```
```
 
```

# Email an der Fehlermeldungen geschickt werden...

```
email="mschulz@jamba.net"
```
```
 
```

# Verzeichnis der Logfiles welche rotiert werden sollen...

```
logdir="/var/log"
```
```
 
```
```
# Name und Pfad des Configfile...
```
```
config="/etc/rotatelogs.cfg"
```
```
 
```
```
# Name und Pfad des Programm Logfile...
```
```
logfile="/var/log/rotatelogs.log"
```
```
 
```
```
# Default Rotation (in Tagen)...
```
```
default_duration=7
```
```
 
```

# **********************************************************

# Funktion zum loggen der Status bzw. Fehlermeldungen.

```
 
```
```
function myLogger() {
```
```
 
```
```
local msg=$1
```

local date=$( date +%Y-%m-%d\ %H:%M:%S )

```
echo "$date $msg" >> $logfile
```
```
 
```
```
}
```
```
 
```

# **********************************************************

# Versenden von Fehlermeldungen und Programm beenden.

```
 
```
```
function error() {
```
```
 
```
```
local status=$1
```
```
 
```

if [ "$notify" = "on" -a -n "$email" ]; then

```
	body="This mail was sent automaticly"
```

	error=$( grep $( date +%Y-%m-%d ) $logfile | grep -i '\[error\]' )

	echo -e "$body\n\n$error"  | mail -s "Error at $0 ..." $email

```
fi
```
```
 
```
```
exit $status
```
```
 
```
```
}
```
```
 
```

# **********************************************************

```
# Programmablauf
```
```
 
```
```
# Startwerte...
```
```
duration=$default_duration
```
```
count=0
```
```
 
```

# Programm beeenden, wenn Konfigurationsdatei fehlt.

[ ! -f "$config" ] && myLogger "[error] $0: config file not found" && error 1

```
 
```

# Programm beenden, wenn $LOGDIR keine Schreibrechte bzw. keine Rechte hat um in den Ordner zu wechseln.

[ ! -w "$logdir" -o ! -x "$logdir" ] && myLogger "[error] $0: you have no permission in $logdir" && error 1

```
 
```
```
cd $logdir
```
```
 
```

# Da viele find-Versionen keine POSIX-Notation beherrschen, verwenden wir hier nicht ':digit:' sondern [0-9].

for name in $( find . -type f -size +0c ! -name '*[0-9]*' ! -name '\.*' ! -name '*conf' -maxdepth 1 -print | sed 's/^\.\///' ); do

```
	count=$(( $count + 1 ))
```
```
 
```

	# Eintrag in der Konfigurationsdatei suchen

	duration="$( grep "^${name}=" $config | cut -d= -f2 )"

```
 
```
```
	if [ -z "$duration" ]; then
```
```
		duration=$default_duration
```
```
	elif [ "$duration" = "0" ]; then
```

		myLogger "[status] $0: set duration to 0 - jump over $name"

```
		continue
```
```
	fi
```
```
 
```
```
	back1="${name}.1"; back2="${name}.2";
```
```
	back3="${name}.3"; back4="${name}.4";
```
```
 
```

	# Wenn die neuste Kopie des Logfiles (back1) innerhalb der festgelegten

	# Zeit veraendert wurde, ist jetzt keine Rotation noetig.

```
	if [ -f "$back1" ]; then
```

		if [ -z $( find "$back1" -mtime +$duration -print 2>/dev/null ) ]; then

			myLogger "[status] $0: skip rotation of $name - last backup of $name less then $duration days"

```
			continue
```
```
		fi
```
```
	fi
```
```
 
```

	myLogger "[status] $0: rotate log file $name ($duration days backup)"

```
 
```

	# Rotieren. Wir beginnen mit dem aeltesten Log file.

	[ -f "$back3" ] && myLogger "[status] $0: rename $back3 -> $back4" && mv -f "$back3" "$back4"

	[ -f "$back2" ] && myLogger "[status] $0: rename $back2 -> $back3" && mv -f "$back2" "$back3"

	[ -f "$back1" ] && myLogger "[status] $0: rename $back1 -> $back2" && mv -f "$back1" "$back2"

	[ -f "$name" ] && myLogger "[status] $0: rename $name -> $back1" && mv -f "$name" "$back1"

```
 
```
```
	touch "$name"
```
```
	chmod 0600 "$name"
```
```
 
```
```
done
```
```
 
```

[ $count -eq 0 ] && myLogger "[status] $0: nothing done - no log files big or old enough for rotation"

```
 
```
```
exit 0
```
```
 
```

# **********************************************************

```
# end of this script...
```

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