{help}Script to Monitor and Auto Restart Apache Httpd Server

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 <http://cyberciti.biz/fb/>
    # 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

Code (markup):

source:


2. script to monitor your server

--- BEGIN ---
#!/home/www/cgi-bin/php -q

<?php

// ***** OPTIONS *****

// E-mail variables
$admin_email = "to@domain.com";
$from_email = "from@domain.com";
$email_body = "Server: SERVERNAME\nDate: ";

// CLAMD (clamav anti-virus) uncomment if you run clamav
// $processes[0] = "/home/usr-local/sbin/clamd";
// $action[0] = "/home/usr-local/sbin/clamd --config-file=/etc/clamav.conf";
// $max_limit[0] = "7";

// HTTPD
$processes[1] = "httpd";
$action[1] = "/usr/spc/httpd.restart";
$max_limit[1] = "100";


// STUNNEL - uncomment if you run stunnel (e.g. for ssl mail connections)
// $processes[2] = "/home/usr-local/sbin/stunnel";
// $action[2] = "/home/usr-local/sbin/stunnel";
// $max_limit[2] = "10";

// MySQL
$processes[3] = "/usr/local/mysql/bin/mysqld";
$action[3] = "";
$max_limit[3] = "70";


// CASP - uncomment if you run cilisoft asp
//$processes[4] = "/home/usr-local/casp/asp-server-3000/caspd";
//$action[4] = "";
//$max_limit[4] = "10";

$log = "Process monitor started...\n";
$fp=popen("/bin/ps -auxw","r");

while (!feof($fp)) {
$buffer = fgets($fp, 4096);
$output .= $buffer;

}

for ($n=0; $n<count($processes); $n++) {
$log .= "checking ".$processes[$n]."... ";
$process_count[$n] = substr_count($output, $processes[$n]);
$log .= $process_count[$n]." processes\n";

if ($process_count[$n] == 0) {
if ($action[$n]<>"") {
$log .= "Executing ".$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 --- 

Code (markup):

source

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 <http://cyberciti.biz/fb/>
# 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

Code (markup):

source

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


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So need your advice which one you recommend.

Any advice will be appreciated

 

to execute shell program just hit

./filename.sh

 

hey, did you read my post ?