Monitor 80-Port 3306-Port passwd file changes
Experiment Description: The environment is a host Linux CentOS release 6.5 (Final) 192.168.0.22 open httpd 80 port 3306 Port
One, prepare before starting the installation:
1. Installing Nagios Server Software
A,nagios-3.5.1.tar.gz
B,nagios-plugins-1.4.16.tar.gz
C,nrpe-2.12.tar.gz
2. Configure Environment variables:
[Email protected]]# echo ' Export lc_all=c ' >>/etc/profile
[Email protected]]# tail-1/etc/profile
Export Lc_all=c
[Email protected]]# Source/etc/profile
3, turn off firewall and SELinux
[[email protected]]#/etc/init.d/iptables stop
[Email protected]]#/etc/init.d/iptables status
Iptables:firewall is not running.
[Email protected]]# chkconfig iptables off
[Email protected]]# chkconfig--list iptables
Iptables 0:off 1:off 2:off 3:off 4:off 5:off 6:off
[[email protected]] #sed –i ' s/selinux=enforce/selinux=disabled/g '/etc/sysconfig/selinux
4, solve the system time synchronization problem
[Email protected] ~]# yum-y install Ntpdate
[Email protected] ~]# CRONTAB-E
#time sync by Tony at 2018-01-29
/5
*/usr/sbin/ntpdate pool.ntp.org >/dev/null 2>&1
Second, the official installation of Ngios
Need a lamp environment
[Email protected] ~]# yum-y install gcc glibc glibc-common
[Email protected] ~]# yum-y install GD gd-devel
[Email protected] ~]# yum-y install Mysql-server
[[email protected] ~]# yum-y install httpd php php-gd
Create the users and groups required on the Nagios server side
[Email protected] ~]#/usr/sbin/useradd Nagios
[Email protected] ~]#/usr/sbin/useradd apache-m-s/sbin/nologin
[Email protected] ~]#/usr/sbin/groupadd nagcmd
[Email protected] ~]#/usr/sbin/usermod-a-G nagcmd Nagios
[Email protected] ~]#/usr/sbin/usermod-a-G nagcmd Apache
Check if user creation is successful
[Email protected] ~]# id-n-G Nagios
[Email protected] ~]# id-n-G Apache
[email protected] ~]# groups Nagios
[email protected] ~]# groups Apache
Start the service to view the communication port
[[email protected] ~]#/etc/init.d/httpd start
[Email protected] ~]# lsof-i:80
[[email protected] ~]#/etc/init.d/mysqld start
[Email protected] ~]# lsof-i:3306
To configure the Hosts file parsing:
[Email protected] ~]# cat/etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
:: 1 localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.0.22 Nagios-server
Third, install Nagios-server service end
[Email protected] ~]# Cd/soft/nagios
[Email protected] nagios]# Tar XF nagios-3.5.1.tar.gz
[[Email protected] nagios]# CD Nagios
[Email protected] nagios]#/configure--with-command-group=nagcmd
[[email protected] nagios]# make all
[[email protected] nagios]# make install
[email protected] nagios]# make Install-init
[email protected] nagios]# make Install-commandmode
After creating the Nagiosweb monitoring interface, you will need to enter your username and password when you log in, respectively, Tony and hwg123
[Email protected] nagios]# htpasswd-bc/usr/local/nagios/etc/htpasswd.users Tony Hwg123
[Email protected] nagios]# cat/usr/local/nagios/etc/htpasswd.users
Tony:fr58UrsZgK.Tc
Check the authorization file
[[email protected] nagios]# grep authuserfile/etc/httpd/conf.d/nagios.conf
Reload the httpd service
[Email protected] nagios]#/etc/init.d/httpd Reload
To modify a contact mailbox:
[Email protected] ~]# cd/usr/local/nagios/etc/objects/
[Email protected] objects]# vim contacts.cfg
Modify Line 35:
email [email protected]
[[email protected] objects]#/etc/init.d/postfix start
[Email protected] objects]# lsof-i:25
[Email protected] objects]# chkconfig postfix on
[Email protected] objects]# chkconfig--list postfix
Enter Http://IP/nagios on the browser and enter tony,hwg123
Go to Web browser interface configuration
To install the Nagios-server server-side plug-in package:
[Email protected] objects]# yum-y install Perl-devel openssl-devel
[Email protected] objects]# cd/soft/nagios/
[Email protected] nagios]# Tar XF nagios-plugins-1.4.16.tar.gz
[Email protected] nagios]# CD nagios-plugins-1.4.16
[Email protected] nagios-plugins-1.4.16]#/configure--with-nagios-user=nagios--with-nagios-group=nagios-- Enable-perl-modules--with-mysql
[[email protected] nagios-plugins-1.4.16]# make
[[email protected] nagios-plugins-1.4.16]# make install
[Email protected] nagios-plugins-1.4.16]# ls/usr/local/nagios/libexec/|wc-l
To install the Nrpe plugin:
[Email protected]]# cd/soft/nagios/
[Email protected]]# Tar XF nrpe-2.12.tar.gz
[Email protected]]# CD nrpe-2.12
[Email protected] nrpe-2.12]#./configure
[[email protected] nrpe-2.12]# make all
[email protected] nrpe-2.12]# make Install-plugin
[email protected] nrpe-2.12]# make Install-daemon
[email protected] nrpe-2.12]# make Install-daemon-config
[Email protected] libexec]# ls/usr/local/nagios/libexec/|wc-l
[Email protected] libexec]# chkconfig Nagios on
[Email protected] libexec]# chkconfig--list Nagios
[Email protected] libexec]# echo "/etc/init.d/nagios start" >>/etc/rc.local
[Email protected] libexec]# tail-1/etc/rc.local
[Email protected] libexec]#/etc/init.d/nagios checkconfig
[Email protected] libexec]#/usr/local/nagios/bin/nagios-v/usr/local/nagios/etc/nagios.cfg
[Email protected] libexec]#/etc/init.d/nagios checkconfig
Iv. Configuration Services (I am here to monitor myself)
[Email protected] etc]# vim nagios.cfg +32
Cfg_file=/usr/local/nagios/etc/objects/commands.cfg
Cfg_file=/usr/local/nagios/etc/objects/contacts.cfg
Cfg_file=/usr/local/nagios/etc/objects/timeperiods.cfg
Cfg_file=/usr/local/nagios/etc/objects/templates.cfg
Cfg_file=/usr/local/nagios/etc/objects/hosts.cfg
Cfg_file=/usr/local/nagios/etc/objects/services.cfg
#cfg_file =/usr/local/nagios/etc/objects/localhost.cfg
Add Cfg_file=/usr/local/nagios/etc/objects/hosts.cfg and Cfg_file=/usr/local/nagios/etc/objects/services.cfg
Note the line cfg_file=/usr/local/nagios/etc/objects/localhost.cfg
[Email protected] nagios-server]# cat/usr/local/nagios/etc/objects/hosts.cfg
Define Host{
Use Linux-server
HOST_NAME 22-nagios-server
Alias 22-nagios
Address 192.168.0.22
}
Define Hostgroup{
Hostgroup_name linux-servers
Alias Linux Servers
Members 22-nagios-server
}
[Email protected] nagios-server]# cat/usr/local/nagios/etc/objects/services.cfg
Define Service{
Use Generic-service
HOST_NAME 22-nagios-server
Service_description HTTP
Check_command check_http
notifications_enabled 0
}
Define Service{
Use Generic-service
HOST_NAME 22-nagios-server
Service_description bolg_port_80
Check_command check_tcp!80
Max_check_attempts 3
Normal_check_interval 2
Retry_check_interval 1
Check_period 24x7
Notification_interval 30
Notification_period 24x7
Notification_options W,u,c,r
Contact_groups Admins
}
Define Service{
Use Generic-service
HOST_NAME 22-nagios-server
Service_description bolg_port_3306
Check_command check_tcp!3306
Max_check_attempts 3
Normal_check_interval 2
Retry_check_interval 1
Check_period 24x7
Notification_interval 30
Notification_period 24x7
Notification_options W,u,c,r
Contact_groups Admins
}
Define Service{
Use Generic-service
HOST_NAME 22-nagios-server
Service_description Passwd
Check_command check_passwd
notifications_enabled 0
}
[Email protected] nagios-server]# cat/usr/local/nagios/etc/objects/commands.cfg
# ' check_passwd ' command definintion
Define Command{
Command_name check_passwd
Command_line $USER 1$/check_passwd-h $HOSTADDRESS $-C $ARG 1$
}
[Email protected] nagios-server]#/usr/local/nagios/bin/nagios-v/usr/local/nagios/etc/nagios.cfg
[Email protected] Nagios-server]#/etc/init.d/nagios Reload
This is done by adding a host, adding a service, and then adding a command, and checking the configuration to finally reload the Nagios service.
Note: Possible failures (some are about Nrpe errors)
1, when logging on to the Web interface, prompt error:
Solution: Vim/usr/local/nagios/etc/cgi.cfg All about nagiosadmin to your own added user name, restart the service.
2,command ' check_passwd ' not define
Solution: To/usr/local/nagios/etc/objects/commands.cfg it is OK.
3,connction Refurse Host
Solution: First cd/usr/local/nagios/libexec under, use./check_nrpe-h 192.168.0.150-c check_ping or./check_nrpe-h 127.0.0.1-c Check_pin G
If you are still prompted Connction Refurse host, next look at Nrpe there is no boot: netstat-lntup |grep Nrpe if no boot execution
/usr/local/nagios/bin/nrpe-c/usr/local/nagios/etc/nrpe.cfg-d then executes./check_nrpe-h 192.168.0.150-c check_ping
4,nrpe command ' Check_disk ' not define
Solution: First Ps-ef |grep Nrpe
Pkill Nrpe
/usr/local/nagios/bin/nrpe-c/usr/local/nagios/etc/nrpe.cfg-d
Ps-ef |grep Nrpe
Then get the./check_nrpe-h 192.168.0.150-c Check_disk
5,check_nrpe:error-could not complete SSL handshake.
Resolution: Vi/usr/local/nagios/etc/nrpe.cfg +79
allowed_hosts=127.0.0.1,192.168.0.22
Ps-ef |grep Nrpe
Pkill Nrpe
/usr/local/nagios/bin/nrpe-c/usr/local/nagios/etc/nrpe.cfg-d
Ps-ef |grep Nrpe
6,nrpe:unable to read output
FIX:./check_nrpe-h 192.168.0.150-c Check_emm If you are prompted nrpe:unable to read output and then
Directly to the inside/usr/local/nagios/libexec/check_memory.pl-w 6%-C 3% If prompted permission denied
Description/usr/local/nagios/libexec/check_memory.pl-w 6%-C 3% does not have permission to execute
chmod +x/usr/local/nagios/libexec/check_memory.pl-w 6%-C 3%
Nagios Monitoring Installation II
