Evilcoder.org

The Logrotate:

We rotate our logs daily, so we needed to write a generic script that provided us with these functions. The script below gives us those options, so it works for us.

#!/usr/local/bin/ksh
##################################################################
# in sorted order:
#                   1. Version History
#                   2. Dependencies
#                   3. Usefull Info
#                   4. Variables
#                   5. Functions
#                   6. Actual Script
#                   7. Creditlines
##################################################################
#
# 1. Version History
#
# date                who?                what?
# 2002/08/29        Remko Lodder        Initial Version
#
#################################################################
#
# 2. Dependencies
#
# date                who?                what dependencies?
# 2002/08/29        Remko Lodder        No dependencies at this moment (standalone script)
#
################################################################
#
# 3. Usefull Info
#
# This script provides logrotation on a relative easy way.
# It was designed for the elvandar.org domain from Remko Lodder
# With a few modifications one can also do logtransfers with the
# same structure buildup by template.ksh
#
###############################################################
#
# 4. Variables
#

#LOGFILE HANDLING
LOG="/var/log/messages"
BACKUPDIR="/etc"
TAR="/usr/bin/tar"
GZIP="/usr/bin/gzip"
DIRDATE=`date "+%Y%m"`
DATE=`date "+%Y-%m-%d"`
TARGET="/backup/logfiles/$DIRDATE"
RotTarget="/backup/logfiles/$DIRDATE/"
SCRIPT=`basename $0`
LOGFILE="/var/logs/$SCRIPT.log"
ERRORFILE="/var/logs/$SCRIPT.errors"
NAMELOG=`echo $LOG | sed ’s/\//\ /g’ | awk ‘ { print $3 } ‘`
UID=$LOGNAME

##############################################################
#
# 5. Functions
#

### Function message, write message with script name and time in the logfile,
### This code is from Rick Rosbag!
### $* is a special variable which will print the rest of the options
### (like message bla ($* then is bla))

function message
{
        echo $SCRIPT: `date +%Y-%d-%m@%H:%M` hour: $*
}

### Function trap_errors, trap errors in the script so we know what went wront,
### This code is from Rick Rosbag!
### $? is korn shell’s standard error return variable, (like exit 1 makes $? 1)

function trap_errors
{
        ERROR=$?
        if [[ "$ERROR" -ne "0" ]];
        then
        message Whoops, something went wrong in $SCRIPT. It reported errors.
        message The error code was $ERROR.
        message The linenumber that created this error is $1
        message Whoops, something went wrong in $SCRIPT. It reported errors.
        message The error code was $ERROR >> $ERRORFILE
        message The linenumber that created this error is $1 >> $ERRORFILE
        fi
}

### Function check directory’s, look if the $DIRDATE directory exists in $TARGET
### When this directory does not exist, it will be created,
### since otherwise the logfiles cannot be stored on the disk

function does_dir_exist
{
        if [[ -d "$TARGET" ]];
        then
        message dir already exists
        else
        mkdir -p $TARGET
        message $TARGET created
        fi
}

### Function run_rotate, rotate given logfiles
### no extra info at this moment

function run_rotate
{
        message rotating $LOG
        cp $LOG $RotTarget/$NAMELOG.$DATE
        gzip $RotTarget/$NAMELOG.$DATE
        :> $LOG
        message rotated and zipped at $RotTarget/$NAMELOG.$DATE
        message placing a logger command into the new syslog file
        logger rotated by $SCRIPT on $DATE
}

### Function chmod_target ,chmod’s $TARGET to 700 for user logfiles
### No other info needed at this moment

function chmod_target
{
        chown -R logfiles:logfiles /backup/logfiles/
        message /var/logs was chowned to logfiles:logfiles
        chmod -R 700 /backup/logfiles
        message /backup/logfiles was chmodded to 700
}

### Function restart syslogd, restart syslog from out a function
### No other info needed at this moment

function restart_syslogd
{
        message Restarting Syslogd
        kill -HUP `cat /var/run/syslog.pid `
        message Syslogd Restarted
}

### function: do backup, backups SQL databases and /etc

function do_backup
{
        message Creating a running backup of the current /etc
        message and /usr/local/etc directories
        message using $TAR to tar the directories and after that
        message use $GZIP to compress them
        $TAR -cf $RotTarget/etc-standard.$DATE.tar $BACKUPDIR
        message Tarred the etc directories now gzipping them
        $GZIP $RotTarget/etc-standard.$DATE.tar

        message backing up the DB
        mysqldump -u example_user -pexample_password exampledb \
        >> /backup/logfiles/$DIRDATE/example.$DATE.sql
        gzip /backup/logfiless/$DIRDATE/example.$DATE.sql

        message Backup Completed! /etc is now safe in
        message $RotTarget/etc and SQL backup complete
}

#############################################################
#
# 6. Actual script
#

### Rick Rosbag Code
### exec >> $LOGFILE, write logging to $LOGFILE
exec >> $LOGFILE
exec 2>&1

message —————————————————-
trap ‘trap_errors $LINENO’ ERR
message Logrotate starting
logger "starting $SCRIPT issued by $UID"
message Rotating Logs
message Checking wether dir exists
does_dir_exist
message Really Rotating
run_rotate
message Restarting syslog
restart_syslogd
do_backup
chmod_target
logger "$SCRIPT finished, issued by $UID"
message End of Script
message —————————————————

############################################################
#
# 7. Creditlines
#
# logrotate.ksh idea / structure / code Rick Rosbag
# logrotate.ksh initially written by Remko Lodder (c) 2002.

written by Remko