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How to Install and Setup Monit (Linux Process and Services Monitoring)

 

              Redhat Linux, CentOS, Fedora & Ubuntu, Linux Mint & Debian.

Installing Monit

Step1 :- yum install monit           --> [RedHat/CentOS/Fedora]

Step2 :- sudo  apt-get install monit --> [Ubuntu/Debian/Linux Mint]

Configuring Monit 

Step3 :-      vi /etc/monit.conf      --> [RedHat/CentOS/Fedora]

Step3 :- sudo vi /etc/monit/monitrc   --> [Ubuntu/Debian/Linux Mint]

Next, uncomment

add the IP address or domain name of your server

     set httpd port 2812 and

Start the Monit

Step4 :- sudo /etc/init.d/monit start

http://localhost:2812” or “http://example.com:2812“ or ip address also can use

Adding Monitoring Services

Step5 :-   vi /etc/monit.conf         --> [RedHat/CentOS/Fedora]

Step5 :- sudo vi /etc/monit/monitrc   --> [Ubuntu/Debian/Linux Mint]

Apache

Apache2

Nginx

MySQL

SSHD

Errors :- When you get message like “Control file syntax OK“,

Step6 :- monit -t        --> [RedHat/CentOS/Fedora]

        monit reload

       monit start all

Step6 :- sudo monit -t   --> [Ubuntu/Debian/Linux Mint]

start the monit service.

Step7 :- /etc/init.d/monit restart      --> [RedHat/CentOS/Fedora]

Step7 :- sudo /etc/init.d/monit restart --> [Ubuntu/Debian/Linux Mint]

checking log file

Step8 :- tail -f /var/log/monit          --> [RedHat/CentOS/Fedora]

Step8 :- sudo tail -f /var/log/monit.log --> [Ubuntu/Debian/Linux Mint]

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How to Install Your Own Cloud Platform with OpenStack in CentOS 7 or RHEL 7 or Fedora Distributions by Using RDO Repositories.

A. Initial System Configurations
Update the CentOS 7
Step1:- sudo yum update

list all running services
Step2:- ss -tulpn


Now identify, stop, disable and remove unneeded services, mainly postfix, NetworkManager and firewalld. At the end the only daemon that would be running on your machine should be sshd.
Step3:- systemctl stop postfix firewalld NetworkManager
Step4:- systemctl disable postfix firewalld NetworkManager
Step5:- systemctl mask NetworkManager
Step6:- yum remove postfix NetworkManager NetworkManager-libnm


Completely disable Selinux policy on the machine by issuing the below commands
Step7:- setenforce 0
Step8:- getenforce

Also edit /etc/selinux/config file set SELINUX line from enforcing to disabled
Step9:- vi /etc/selinux/config
SELINUX=disabled


set your Linux system hostname, Replace the FQDN variable
Step10:- hostnamectl set-hostname cloud.centos.lan


install ntpdate command to synchronize time with a NTP server
Step11:- yum install ntpdate


B. Install OpenStack in CentOS and RHEL
In order to enable rdo repositories on RHEL/CentOS 7
Step12:- yum install https://www.rdoproject.org/repos/rdo-release.rpm


Now it’s time to install PackStack package
Step13:- yum install  openstack-packstack


The file will be named after the current day timestamp when generated (day, month and year).
Step14:- packstack --gen-answer-file='date +"%d.%m.%y"'.conf
Step15:- ls


Now edit the generated answer configuration file with a text editor
Step16:- vi 22.04.16.conf


In order to be safe replace the passwords fields
Step17:- CONFIG_NTP_SERVERS=0.ro.pool.ntp.org

Please consult http://www.pool.ntp.org/en/ server list in order to use a public NTP server near your physical location


Step18:- CONFIG_PROVISION_DEMO=n
Step19:- CONFIG_KEYSTONE_ADMIN_PW=123(Give Your Password) --> for Admin user


Access OpenStack dashboard via HTTP with SSL enabled.
Step20:- CONFIG_HORIZON_SSL=y


The root password for MySQL server.
Step21:- CONFIG_MARIADB_PW=123(Give Your Password)

Setup a password for nagiosadmin user in order to access Nagios web panel
Step22:- CONFIG_NAGIOS_PW=123(Give Your Password)


open SSH server configuration file and uncomment PermitRootLogin line by removing the front hashtag
Step23:- vi /etc/ssh/sshd_config
PermitRootLogin Yes

restart SSH service to reflect changes
Step24:- systemctl restart sshd


C. Start Openstack Installation Using Packstack Answer File
start Openstack installation process via the answer file edited
Step25:- packstack --answer-file 13.04.16.conf


If for some reasons the installation process ends with an error regarding httpd service, open /etc/httpd/conf.d/ssl.conf file and make sure you comment the following line as illustrated below
Step26:- #Listen 443 https


restart Apache daemon to apply changes
Step27:- systemctl restart httpd.service



Note: In case you still can’t browse Openstack web panel on port 443 restart the installation process from beginning with the same command issued for the initial deployment.
Step28:- packstack --answer-file /root/22.04.16.conf


E. Remotely Access OpenStack Dashboard
Step29:- https://192.168.1.197/dashboard

username :- admin
password :- 123(which we give during installation)

Alternatively, if you opted to install Nagios component for OpenStack, you can browse Nagios web panel at the following URI and login with the credentials setup in answer file.
Step30:- https://192.168.1.197/nagios .