Linux monitoring

1. How to Install and Setup Monit (Linux Process and Services
Monitoring) Program
Monit is a small Open Source utility for managing and monitoring Unix systems. Monit conducts
automatic maintenance and repair and can execute meaningful causal actions in error situations.
monit is a utility for managing and monitoring processes, files, directories and file systems on a
Unix system. Monit conducts automatic maintenance and repair and can execute meaningful causal
actions in error situations. E.g. Monit can start a process if it does not run, restart a process if it does
not respond and stop a process if it uses too much resources. You may use Monit to monitor files,
directories and file systems for changes, such as timestamps changes, checksum changes or size
changes.
Monit is controlled via an easy to configure control file based on a free-format, token-oriented
syntax. Monit logs to syslog or to its own log file and notifies you about error conditions via
customizable alert messages. Monit can perform various TCP/IP network checks, protocol checks and
can utilize SSL for such checks. Monit provides a http(s) interface and you may use a browser to access
the Monit program.
Install and Setup Monit on Centos6
# yum install monit
# vi /etc/monit.conf
## mailserver Setup ##
Note:- I have Google mail Server.
set mailserver smtp.gmail.com port 587
username "pawan.kumar@indianpetro.com" password "********"
using tlsv1
with timeout 30 seconds
## You can set alert recipients whom will receive alerts if/when a ##
set mail-format { from: monitor@indianpetro.com }
set alert pawan.kumar@indianpetro.com
mail-format {
from: monitor@indianpetro.com
subject: $SERVICE $EVENT at $DATE

2. message: Monit $ACTION $SERVICE at $DATE on $HOST,
Yours sincerely,
Pawan Kumar
Linux System Administrator
IndianPetro Group
(A Division of 360 Analytics & Advisory Pvt. Ltd.)
## Monit has an embedded web server which can be used to view status of###
set httpd port 2812 and
use address localhost # only accept connection from localhost
allow localhost # allow localhost to connect to the server and
allow admin:monit # require user 'admin' with password 'monit'
allow @monit # allow users of group 'monit' to connect (rw)
allow @users readonly # allow users of group 'users' to connect readonly
Monitoring Services Example
#################################### Mysql ########################
check process mysqld with pidfile /var/run/mysqld/mysqld.pid
group mysql
start program = "/etc/init.d/mysqld start"
stop program = "/etc/init.d/mysqld stop"
if failed host 127.0.0.1 port 3306 then restart
if 5 restarts within 5 cycles then timeout

3. #################################### SSH ############################
check process sshd with pidfile /var/run/sshd.pid
start program "/etc/init.d/sshd start"
stop program "/etc/init.d/sshd stop"
if failed host 127.0.0.1 port 22 protocol ssh then restart
if 5 restarts within 5 cycles then timeout
############################ Tomcat1 ####################
check process tomcat with pidfile "/var/run/tomcat/tomcat.pid"
start program = "/usr/local/tomcat6/bin/startup.sh"
as uid root gid root
stop program = "/usr/local/tomcat6/bin/shutdown.sh"
as uid root gid root
if failed port 7070 then alert
if failed port 7070 for 5 cycles then restart
##################### Tomcat2 ###########################
check process tomcat1 with pidfile "/var/run/tomcat1/tomcat1.pid"
start program = "/usr/local/tomcat7/bin/startup.sh"
as uid pawan gid pawan
stop program = "/usr/local/tomcat7/bin/shutdown.sh"
as uid pawan gid pawan
if failed port 9090 then alert
if failed port 9090 for 5 cycles then restart

4. #### Then edit your catalina.sh and set ####
# vim /usr/local/tomcat/bin/catalina.sh
CATALINA_PID to be /var/run/tomcat/tomcat.pid
#mkdir /var/run/tomcat/
#chown root:root /var/run/tomcat/
Thanks
P@w@n Kumar
https://www.facebook.com/LinuxLiveScenarioClass