Monit is a utility for managing and monitoring, processes, programs, files, directories and file systems on a UNIX system. Monit conducts automatic maintenance and repair and can execute meaningful causal actions in error situations ::: " a great little utility that monitors your daemons " In Short it lets you know when your Apache server goes d…

monit-deamon-server-monitor

# Monit is a utility for managing and monitoring, processes, programs, files, directories and file systems on a UNIX system. Monit conducts automatic maintenance and repair and can execute meaningful causal actions in error situations ::: " a great little utility that monitors your daemons "

# in Short it lets you know when your Apache server goes down, when you reach your pre-determined memory usage. It will also restart key components should they stop working, for instance your web server ( apache ) might "crash" due to a DDOS attack or similar, monit will attempt to restart said services notifying you of whats going on, depending on your mmonit configuration :::

# Official site : http://mmonit.com/

#  IMPORTANT : add your own data or parameters, I make use of double segments [[ your variable ]]. eg. ssh root@[[ 96.172.44.11 ]] should be replaced with ssh root@888.88.88.88 where "888.88.88.88" is your value, variable etc. I have a habit of using ":::" to indicate line ending and end of paragraph, crazy I know but be warned its just how I write ::: All notes are for my own use & should you use any it's at your own risk, it's NOT a Tutorial :::

# I'm new to server side setup so if I've erred or you know of a better way PLS. contribute :::
# mail me at support@yourdesign.co.za

# I installed this on my Ubuntu 12.04 VPS server, the setup might differ depending on your server configuration :::

# Install Monit
sudo apt-get install monit

# Configure Monit
# Open
sudo nano /etc/monit/monitrc

# Confirm that it's at end of file
include /etc/monit/conf.d/*

# Add Mail Format
### Mail Format START

set mail-format {
      from: monit@$HOST
   subject: monit alert --  $EVENT $SERVICE
   message: $EVENT Service $SERVICE
                 Date:        $DATE
                 Action:      $ACTION
                 Host:        WP-Beta
                 Description: $DESCRIPTION
}

### Mail Format END


# Change permission on the folder /etc/monit/conf.d as it will include your email password stored in plain text.
sudo chmod 0700 -R /etc/monit/conf.d/

# Check if "START=" is set to "yes"
sudo nano /etc/default/monit

# Monit’s settings are devided into three files:
# basic.conf
# apache.conf
# mysql.conf

# Create a basic config file
sudo nano /etc/monit/conf.d/basic.conf

# Add the following save and close

### BASIC.CONF START

# default deamon is set to 120 ( 2 minutes ) you can override if necessary
# set daemon 60

set logfile syslog facility log_daemon

#mail server
set mailserver smtp.gmail.com port 587
        username "[[ user_name@gmail.com ]]" password "[[ gmail_password ]]"
        using tlsv1
        with timeout 60 seconds

        set alert [[ user_name@gmail.com ]]

#Following settings for web interface
set httpd port 2812 and
        use address 198.xxx.xx.xxx
        allow 0.0.0.0/0.0.0.0
        allow [[ user ]]:[[ userpassword]]

check system localhost
        if loadavg (1min) > 4 then alert
        if loadavg (5min) > 3 then alert
        if memory usage > 75% then alert
        if cpu usage (user) > 70% then alert
        if cpu usage (system) > 30% then alert
        if cpu usage (wait) > 20% then alert

check process sshd with pidfile /var/run/sshd.pid
       start program "/etc/init.d/ssh start"
       stop program "/etc/init.d/ssh stop"
       if failed port 2042 protocol ssh then restart
       if 5 restarts within 5 cycles then timeout

### BASIC.CONF END

# Create Apache file
sudo nano /etc/monit/conf.d/apache.conf

### APACHE.CONF START

check process apache2 with pidfile /var/run/apache2.pid
# (for ubuntu, debian)
      group www-data
      start program = "/etc/init.d/apache2 start" with timeout 60 seconds
      stop program = "/etc/init.d/apache2 stop"
      if children > 250 then restart
      if loadavg(5min) greater than 10 for 8 cycles then stop
      if totalmem > 512.0 MB for 5 cycles then alert
      # if totalmem > 512.0 MB for 5 cycles then restart
      if 3 restarts within 5 cycles then timeout

### APACHE.CONF END


# Create the Mysql conf file
sudo nano /etc/monit/conf.d/mysql.conf

### MYSQL.CONF START

check process mysqld with pidfile /var/run/mysqld/mysqld.pid
      start program = "/etc/init.d/mysql start"
      stop program = "/etc/init.d/mysql stop"

      if failed host 127.0.0.1 port 3306 then restart
      if failed host 127.0.0.1 port 3306 protocol mysql then alert
      if 5 restarts within 5 cycles then timeout

### MYSQL.CONF END

# Create the Postfix conf file
sudo nano /etc/monit/conf.d/postfix.conf

### POSTFIX START
# Check if you have  group mail first
groups ( should print mail if available )

check process postfix with pidfile /var/run/postfix.pid
   group mail
   start program = "/etc/init.d/postfix start"
   stop  program = "/etc/init.d/postfix stop"
   if failed port 25 protocol smtp then restart
   if 5 restarts within 5 cycles then timeout
   depends on postfix_rc

 check file postfix_rc with path /etc/init.d/postfix
   group mail
   if failed checksum then unmonitor
   if failed permission 755 then unmonitor
   if failed uid root then unmonitor
   if failed gid root then unmonitor

### POSTFIX END


# Start and Stop Monit
sudo /etc/init.d/monit stop
sudo /etc/init.d/monit start

# verify that Monit by checking /var/log/syslog
# You should also receive an email that says that Monit is now running.

# If alls well kill apache and monitor if it starts again ( will take 2 minutes unless you changed "set daemon")
sudo killall apache2

# Monit Web interface
# Monit Web interface will run on the port number 2812. If you have any firewall in your network setup you need to enable this port.
# Now point your browser to http://yourserverip:2812/ (make sure port 2812 isn’t blocked by your firewall)
# log in with username and password as set in "allow [[ user ]]:[[ user_password ]]" .If you want a secure login you can use https check