Server Configurations

Server Confiugrations from scratch.

Configure a simple chat server using ejabberd ( on Debian)

akash Advanced Linux, Debian / Ubuntu, Server Configurations

Hi,

To create  a chat server without ldap and mysql for small organization follow the steps below ( same procedure will be for CentOS but you have to install ejabberd using yum)

(Prerequisites : A DNS must be configured for server otherwise you will have to use IP instead of doamin name for configuration)

Install the ejabberd package on server

# apt-get install ejabberd

 

Check the service is running or not to register a admin user

 

Create admin user by typing below command

#ejabberdctl register admin localhost passwordforadminuser

 

edit /etc/ejabberd/ejabberd.yml file for admin user access and domain for which we are creating service

 

edit default  entry like given below

 

add host like given below

 

Register admin user as admin for domain

 

go to the browser and open the admin panel

https://<your ip or domain >:5280/admin

and login as user admin@localhost

 

Console will be like given below. click on Virtual Hosts

 

Select domain (in my case its  geekonline.in)  by clicking it.

 

Click on users to create / edit users

 

Add users like given below

 

Configure pidgin as below

 

Nagios ( over ssh )

akash Advanced Linux, Debian / Ubuntu, Server Configurations 
Configuring Nagios ( My Os is Ubuntu )

Before configuring nagios server configure the server as mail server/relay server

A. INSTALLATION

1) Download Source in /usr/local/src/

wget http://liquidtelecom.dl.sourceforge.net/project/nagios/nagios-4.x/nagios-4.2.3/nagios-4.2.3.tar.gz

wget --no-check-certificate https://nagios-plugins.org/download/nagios-plugins-2.1.4.tar.gz

tar -zxvf nagios-plugins-2.1.4.tar.gz

2) Add user and group

useradd nagios

groupadd nagcmd

usermod -a -G nagcmd nagios

usermod -a -G nagios,nagcmd www-data
 (* for centos this will be usermod -a -G nagios,nagcmd apache)

3) Configurating and compiling source code nagios core:

tar -zxvf nagios-4.2.3.tar.gz

tar -zxvf nagios-plugins-2.1.4.tar.gz

cd nagios-4.2.3

install packages

apt-get install snmp

apt-get install snmpd

apt-get install mrtg

(*for centos

net-snmp-5.3.2.2-22.el5_10.1

net-snmp-libs-5.3.2.2-22.el5_10.1)

./configure --with-command-group=nagcmd --with-mail=/usr/bin/sendmail –with-httpd-conf=/etc/apache2/sites-available/

(* for centos this will be ./configure --with-command-group=nagcmd )

make all

make install

make install-init

make install-config

make install-commandmode

make install-webconf

cp -R contrib/eventhandlers/ /usr/local/nagios/libexec/

chown -R nagios:nagios /usr/local/nagios/libexec/eventhandlers

/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg

4) configuring Apache

sudo a2ensite nagios

sudo a2enmod rewrite cgi ( enable mod rewrite in httpd for centos)

service apache2 reload / restart

(* for centos it will be /etc/init.d/httpd restart /reload)

/etc/init.d/nagios start

htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin

5) Configurating and compiling source code nagios plugins

cd ../nagios-plugins-2.1.4/

./configure --with-nagios-user=nagios --with-nagios-group=nagios

make

make install

sudo update-rc.d nagios defaults

(* for centos it will be

chkconfig --add nagios

chkconfig --level 35 nagios on )

B. CONFIGURATION

On Client

apt-get install libmysqlclient*-dev ( for check_mysql plugin its required )

mysql51-mysql-libs.x86_64 ( for centos)

useradd nagios

groupadd nagcmd

usermod -a -G nagcmd nagios

cd /usr/local/src

wget --no-check-certificate https://nagios-plugins.org/download/nagios-plugins-2.1.4.tar.gz

tar -zxvf nagios-plugins-2.1.4.tar.gz

cd nagios-plugins-2.1.4

./configure --with-nagios-user=nagios --with-nagios-group=nagios

make

make install

On Server

su nagios

ssh-keygen

copy the content of the file id_rsa.pub to the file /home/nagios/.ssh/authorized_keys

cd /usr/local/nagios/etc/objects

(write your own commands for remote servers which we are going to monitor via ssh agent. )

vi remote-commands.cfg ( for example see my remote-commands.cfg at the end of the document.)

cd /usr/local/nagios/etc

vi nagios.cfg and add the below line

cfg_file=/usr/local/nagios/etc/objects/remote-eommands.cfg

cd /usr/local/nagios/etc/objects

vi hostgroups.cfg ( create your hostgroups. In localhost.cfg you can find how hostgrup is written. Sample files are at the end of the document )

cd /usr/local/nagios/etc

vi nagios.cfg and add the below line

cfg_file=/usr/local/nagios/etc/objects/hostgroups.cfg

mkdir /usr/local/nagios/etc/objects/{Linux-Workstations,Windows-Workstations,Laptops,DRBL-Workstations,Local-Servers,Remote-Servers)

cd /usr/local/nagios/etc

vi nagios.cfg and add the below lines

cfg_dir=/usr/local/nagios/etc/objects/Local-Servers

cfg_dir=/usr/local/nagios/etc/objects/Linux-Workstations

cfg_dir=/usr/local/nagios/etc/objects/Windows-Workstations

cfg_dir=/usr/local/nagios/etc/objects/Laptops

cfg_dir=/usr/local/nagios/etc/objects/Remote-Servers

copy the localhost.cfg to /usr/local/nagios/etc/objects/Linux-Workstations/<system-to-monitor-ip>.cfg ( for example I have 192.168.100.199 ip so i copied file as 192.168.100.199.cfg)

vim 192.168.100.199.cfg
 remove all hostgroup entries and make the changes accordingly




For remote system monitoring write the file /usr/local/nagios/etc/objects/remote-commands.cfg like below

define command{
 command_name check_remote_disk
 # command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/check_disk -w $ARG1$ -c $ARG2$ -e'
 command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/check_disk -w $ARG2$ -c $ARG3$ -A -I "/run/*" -I "/sys/*" -I "/dev/shm" -I "/dev" -I "/lib/*" -I "/var/lock" -I "/Thecus/*"'
 }

define command{
 command_name check_remote_load
 command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/check_load -w $ARG2$ -c $ARG3$'
 }

define command{
 command_name check_remote_swap
 command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/check_swap -w $ARG2$ -c $ARG3$'
 }

define command{
 command_name check_remote_users
 command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/check_users -w $ARG2$ -c $ARG3$'
 }

define command{
 command_name check_remote_procs
 command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/check_procs -w $ARG2$ -c $ARG3$'
 }

define command{
 command_name check_remote_ssh
 command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/check_ssh -H $HOSTADDRESS$ $ARG1$'
 }

#define command{
 # command_name check_remote_mysql
 # command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/check_mysql -H $HOSTADDRESS$ $ARG1$'
 #}

define command{
 command_name check_remote_pgsql
 command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/check_pgsql -H $HOSTADDRESS$ -l $ARG2$ -p $ARG3$'
 }

define command{
 command_name check_remote_http
 command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/check_http -H $HOSTADDRESS$'
 }

define command{
 command_name check_remote_ldap
 command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/check_ldap -H $HOSTADDRESS$ $ARG1'
 }

define command{
 command_name show_remote_users
 command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/show_users'
 }

define command{
 command_name check_remote_mysql
 command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/check_mysql -u $ARG2$ -p $ARG3$'
 }

define command{
 command_name check_remote_asterisk
 command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/check_asterisk'
 }

define command{
 command_name check_remote_ping
 command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/check_ping -H $HOSTADDRESS$ -w 3000.0,80% -c 5000.0,100% -p 5'
 }

define command{ command_name show_logged_users command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $ARG2$ -C '/usr/local/nagios/libexec/logged_users' }

For host write files like given (sample configuration geekonline.cfg )

define host{
 use                     remote-linux-server            ; Name of host template to use
 ; This host definition will inherit all variables that are defined
 ; in (or inherited by) the linux-server host template definition.
 host_name               GEEKHOST
 alias                   GeekHost
 address                 23.250.32.8
 }

define service{
 use                             local-service         ; Name of service template to use
 host_name                       GEEKHOST
 service_description             PING
 check_command            check_remote_ping!22!100.0,20%!500.0,60%
 }

define service{
 use                             local-service         ; Name of service template to use
 host_name                       GEEKHOST
 service_description             Partitions
 check_command            check_remote_disk!22!20%!10%!/
 }

define service{
 use                             local-service         ; Name of service template to use
 host_name                       GEEKHOST
 service_description             Current Users
 check_command            check_remote_users!22!20!50
 }

define service{
 use                             local-service         ; Name of service template to use
 host_name                       GEEKHOST
 service_description             Total Processes
 check_command            check_remote_procs!22!250!400!RSZDT
 }

define service{
 use                             local-service         ; Name of service template to use
 host_name                       GEEKHOST
 service_description             Current Load
 check_command            check_remote_load!22!5.0,4.0,3.0!10.0,6.0,4.0
 }

define service{
 use                             local-service         ; Name of service template to use
 host_name                       GEEKHOST
 service_description             Swap Usage
 check_command            check_remote_swap!22!20!10
 }

define service{
 use                             local-service         ; Name of service template to use
 host_name                       GEEKHOST
 service_description             SSH
 check_command            check_ssh
 notifications_enabled        0
 }

define service{
 use                             local-service         ; Name of service template to use
 host_name                       GEEKHOST
 service_description             Logged in Users
 check_command                   show_remote_users!22!
 notifications_enabled           0
 }

define service{
 use                             local-service         ; Name of service template to use
 host_name                       GEEKHOST
 service_description             MYSQL
 check_command                   check_remote_mysql!22!root!<rootPassword>
 notifications_enabled           0
 }p

/etc/init.d/nagios/restart




http://<ip>/nagios