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Script to Monitor and Auto Restart Apache Httpd Server
| Posted by 3-rx, 01-22-2009, 04:26 PM |
| hi,
As I am new to Linux server, I am facing some doubts like the Script to can monito my unmanaged server and Auto Restart Apache Httpd Server
I'm on linux server, OS- Centos, control panel- DA.
I setup only 5-6 my websites on this server, which don't have so much traffic; installed few php scripts, which eat a lot of memory. I setup 2gb RAm, but unfortunately the server last 2 weeks often went to offline, as server was out of memory.
after a little research find few scripts
1. Linux Server Hack - How to setup a Shell Script to Auto Restart Apache Httpd Server!
Save the following as restart.sh:
#!/bin/bash
# Apache Process Monitor
# Restart Apache Web Server When It Goes Down
# -------------------------------------------------------------------------
# Copyright (c) 2003 nixCraft project
# This script is licensed under GNU GPL version 2.0 or above
# -------------------------------------------------------------------------
# This script is part of nixCraft shell script http://en.wikipedia.org/wiki/Shell_script collection (NSSC)
# Visit http://bash.cyberciti.biz/ for more information.
# -------------------------------------------------------------------------
# RHEL / CentOS / Fedora http://en.wikipedia.org/wiki/Fedora Linux restart command
RESTART="/sbin/service httpd restart"
# uncomment if you are using Debian / Ubuntu Linux
#RESTART="/etc/init.d/apache2 restart"
#path to pgrep command
PGREP="/usr/bin/pgrep"
# Httpd daemon name,
# Under RHEL/CentOS/Fedora it is httpd
# Under Debian 4.x it is apache2
HTTPD="httpd"
# find httpd pid
$PGREP ${HTTPD}
if [ $? -ne 0 ] # if apache not running
then
# restart apache
$RESTART
fi
Then setup a cron job like this: (usually in your sa-update file under /etc/cron.d)
*/5 * * * * root /root/restart.sh >/dev/null 2>&1
source: (http://zedomax.com/blog/2008/07/28/linux-server-hack-how-to-setup-a-shell-script-to-auto-restart-apache-httpd-server/)
2. script to monitor your server
--- BEGIN ---
#!/home/www/cgi-bin/php -q
"") {
$log .= "Executing ".$action[$n]." ...\n";
exec($action[$n]);
$mailheaders = "From: ".$from_email."\nContent-Type: tex
t/plain; charset=\"us-ascii\"";
mail ($admin_email, "Restarting ".$processes[$n], $email
_body, $mailheaders);
} else {
$log .= $action[$n]." not running!\n";
$mailheaders = "From: ".$from_email."\nContent-Type: tex
t/plain; charset=\"us-ascii\"";
mail ($admin_email, $processes[$n]." not running!", $ema
il_body, $mailheaders);
}
}
else if ($process_count[$n] > $max_limit[$n]) {
$log .= "Too many (".$process_count[$n].") ".$processes[$n]." pr
ocesses. Sending notice to $admin_email\n";
$mailheaders = "From: ".$from_email."\nContent-Type: text/plain;
charset=\"us-ascii\"";
mail ($admin_email, "Too many (".$process_count[$n].") ".$proces
ses[$n]." processes", $email_body, $mailheaders);
}
}
// Uncomment following line to print log to stdout
#echo $log;
?>
--- END ---
source (http://forums.olm.net/showthread.php?t=415)
3. Shell script to restart MySQL server if it is killed or not working
#!/bin/bash
# Shell script to restart MySQL server if it is killed or not working
# due to ANY causes.
# When script detects mysql is not running (it basically sends ping request
# to MySQL) it try to start using /etc/init.d/mysql script; and it sends an
# email to user indicating the status.
# This script must be run from Cron Job so that it can monitor mysql server.
# For more info visit following url:
# http://www.cyberciti.biz/nixcraft/vivek/blogger/2005/08/linux-mysql-server-monitoring.html
# --------------------------------------------------------------------------
# Copyright (C) 2005 nixCraft project
# This script is licensed under GNU GPL version 2.0 or above
# -------------------------------------------------------------------------
# This script is part of nixCraft shell script collection (NSSC)
# Visit http://bash.cyberciti.biz/ for more information.
# -------------------------------------------------------------------------
# mysql root/admin username
MUSER="root"
# mysql admin/root password
MPASS="SET-ROOT-PASSWORD"
# mysql server hostname
MHOST="localhost"
#Shell script to start MySQL server i.e. path to MySQL daemon start/stop script.
# Debain uses following script, need to setup this according to your UNIX/Linux/BSD OS.
MSTART="/etc/init.d/mysql start"
# Email ID to send notification
EMAILID="notification@somewhere-corp.com"
# path to mail program
MAILCMD="$(which mail)"
# path mysqladmin
MADMIN="$(which mysqladmin)"
#### DO NOT CHANGE anything BELOW ####
MAILMESSAGE="/tmp/mysql.fail.$$"
# see if MySQL server is alive or not
# 2&1 could be better but i would like to keep it simple and easy to
# understand stuff
$MADMIN -h $MHOST -u $MUSER -p${MPASS} ping 2>/dev/null 1>/dev/null
if [ $? -ne 0 ]; then
echo "" >$MAILMESSAGE
echo "Error: MySQL Server is not running/responding ping request">>$MAILMESSAGE
echo "Hostname: $(hostname)" >>$MAILMESSAGE
echo "Date & Time: $(date)" >>$MAILMESSAGE
# try to start mysql
$MSTART>/dev/null
# see if it is started or not
o=$(ps cax | grep -c ' mysqld$')
if [ $o -eq 1 ]; then
sMess="MySQL Server MySQL server successfully restarted"
else
sMess="MySQL server FAILED to restart"
fi
# Email status too
echo "Current Status: $sMess" >>$MAILMESSAGE
echo "" >>$MAILMESSAGE
echo "*** This email generated by $(basename $0) shell script ***" >>$MAILMESSAGE
echo "*** Please don't reply this email, this is just notification email ***" >>$MAILMESSAGE
# send email
$MAILCMD -s "MySQL server" $EMAILID < $MAILMESSAGE
else # MySQL is running and do nothing
:
fi
# remove file
rm -f $MAILMESSAGE
source (http://bash.cyberciti.biz/monitoring/monitor-mysql-server-shell-script/)
4. Monit
M/Monit is a system for automatic management and monitoring of Information Technology Systems. M/Monit can monitor and manage distributed computer systems, conduct automatic maintenance and repair and execute meaningful causal actions in error situations.
M/Monit can start a service if it does not run, restart a service if it does not respond and suspend a service if it utilize too much resources.
Monitor system attributes such as CPU, Load, Memory, Disk usage, files, directories and filesystems for changes. Conditional rules can be set and if a value goes outside a defined scope specific actions can be executed and notification sent.
Information is collected from monitored systems and stored in a database. Drill-down and filter functions exist to investigate collected data.
source (http://mmonit.com)
=-----------
So need your advice which one you recommend.
Any advice will be appreciated
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