监控80端口 3306端口 passwd文件变化
实验说明 ：环境就是一台主机Linux CentOS release 6.5 (Final) 192.168.0.22 开启httpd 80端口 3306端口
一，开始安装前准备：
1,安装nagios服务端软件
a，nagios-3.5.1.tar.gz
b，nagios-plugins-1.4.16.tar.gz
c，nrpe-2.12.tar.gz
2,配置环境变量：
[root@Nagios-Server ]# echo 'export LC_ALL=C'>>/etc/profile
[root@Nagios-Server ]# tail -1 /etc/profile
export LC_ALL=C
[root@Nagios-Server ]# source /etc/profile3，关闭防火墙和selinux
[root@Nagios-Server ]# /etc/init.d/iptables stop
[root@Nagios-Server ]# /etc/init.d/iptables status
iptables: Firewall is not running.
[root@Nagios-Server ]# chkconfig iptables off
[root@Nagios-Server ]# chkconfig --list iptables
iptables 0:off 1:off 2:off 3:off 4:off 5:off 6:off
[root@Nagios-Server]#sed –i ‘s/SELINUX=enforce/SELINUX=disabled/g’ /etc/sysconfig/selinux4,解决系统时间同步问题
[root@Nagios-Server ~]# yum -y install ntpdate
[root@Nagios-Server ~]# crontab -e
#time sync by tony at 2018-01-29
*/5 * * * * /usr/sbin/ntpdate pool.ntp.org >/dev/null 2>&1二、正式安装Ngios
需要一个LAMP环境
[root@Nagios-Server ~]# yum -y install gcc glibc glibc-common
[root@Nagios-Server ~]# yum -y install gd gd-devel
[root@Nagios-Server ~]# yum -y install mysql-server
[root@Nagios-Server ~]# yum -y install httpd php php-gd 创建Nagios服务器端需要的用户及组
[root@Nagios-Server ~]# /usr/sbin/useradd nagios
[root@Nagios-Server ~]# /usr/sbin/useradd apache -M -s /sbin/nologin
[root@Nagios-Server ~]# /usr/sbin/groupadd nagcmd
[root@Nagios-Server ~]# /usr/sbin/usermod -a -G nagcmd nagios
[root@Nagios-Server ~]# /usr/sbin/usermod -a -G nagcmd apache检查用户创建是否成功
[root@Nagios-Server ~]# id -n -G nagios
[root@Nagios-Server ~]# id -n -G apache
[root@Nagios-Server ~]# groups nagios
[root@Nagios-Server ~]# groups apache启动服务查看通讯端口
[root@Nagios-Server ~]# /etc/init.d/httpd start
[root@Nagios-Server ~]# lsof -i:80
[root@Nagios-Server ~]# /etc/init.d/mysqld start
[root@Nagios-Server ~]# lsof -i:3306配置hosts文件解析 ：
[root@Nagios-Server ~]# 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三、安装Nagios-Server服务端
[root@Nagios-Server ~]# cd /soft/nagios
[root@Nagios-Server nagios]# tar xf nagios-3.5.1.tar.gz
[root@Nagios-Server nagios]# cd nagios
[root@Nagios-Server nagios]# ./configure --with-command-group=nagcmd
[root@Nagios-Server nagios]# make all
[root@Nagios-Server nagios]# make install
[root@Nagios-Server nagios]# make install-init
[root@Nagios-Server nagios]# make install-commandmode创建NagiosWeb监控界面后，登录时会需要输入用户名及密码，这里分别为tony和hwg123
[root@Nagios-Server nagios]# htpasswd -bc /usr/local/nagios/etc/htpasswd.users tony hwg123
[root@Nagios-Server nagios]# cat /usr/local/nagios/etc/htpasswd.users
tony:fr58UrsZgK.Tc查看一下授权文件
[root@Nagios-Server nagios]# grep AuthUserFile /etc/httpd/conf.d/nagios.conf 重载一下httpd服务
[root@Nagios-Server nagios]# /etc/init.d/httpd reload修改联系人邮箱：
[root@Nagios-Server ~]# cd /usr/local/nagios/etc/objects/
[root@Nagios-Server objects]# vim contacts.cfg
修改35行：
email [email protected]
[root@Nagios-Server objects]# /etc/init.d/postfix start
[root@Nagios-Server objects]# lsof -i:25
[root@Nagios-Server objects]# chkconfig postfix on
[root@Nagios-Server objects]# chkconfig --list postfix 在浏览器上输入http://IP/nagios ，然后输入tony，hwg123
进入web浏览器界面配置
安装Nagios-server服务器端插件包：
[root@Nagios-Server objects]# yum -y install perl-devel openssl-devel
[root@Nagios-Server objects]# cd /soft/nagios/
[root@Nagios-Server nagios]# tar xf nagios-plugins-1.4.16.tar.gz
[root@Nagios-Server nagios]# cd nagios-plugins-1.4.16
[root@Nagios-Server nagios-plugins-1.4.16]# ./configure --with-nagios-user=nagios --with-nagios-group=nagios --enable-perl-modules --with-mysql
[root@Nagios-Server nagios-plugins-1.4.16]# make
[root@Nagios-Server nagios-plugins-1.4.16]# make install
[root@Nagios-Server nagios-plugins-1.4.16]# ls /usr/local/nagios/libexec/ |wc -l安装NRPE插件：
[root@Nagios-Server ]# cd /soft/nagios/
[root@Nagios-Server ]# tar xf nrpe-2.12.tar.gz
[root@Nagios-Server ]# cd nrpe-2.12
[root@Nagios-Server nrpe-2.12]# ./configure
[root@Nagios-Server nrpe-2.12]# make all
[root@Nagios-Server nrpe-2.12]# make install-plugin
[root@Nagios-Server nrpe-2.12]# make install-daemon
[root@Nagios-Server nrpe-2.12]# make install-daemon-config
[root@Nagios-Server libexec]# ls /usr/local/nagios/libexec/ |wc -l
[root@Nagios-Server libexec]# chkconfig nagios on
[root@Nagios-Server libexec]# chkconfig --list nagios
[root@Nagios-Server libexec]# echo "/etc/init.d/nagios start">>/etc/rc.local
[root@Nagios-Server libexec]# tail -1 /etc/rc.local
[root@Nagios-Server libexec]# /etc/init.d/nagios checkconfig
[root@Nagios-Server libexec]# /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
[root@Nagios-Server libexec]# /etc/init.d/nagios checkconfig四、配置服务（我此处就是本机监控自己）
[root@Nagios-Server 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
添加cfg_file=/usr/local/nagios/etc/objects/hosts.cfg和cfg_file=/usr/local/nagios/etc/objects/services.cfg
注释该行cfg_file=/usr/local/nagios/etc/objects/localhost.cfg
[root@centos6 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
}
[root@centos6 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
}
[root@centos6 Nagios-Server]# cat /usr/local/nagios/etc/objects/ commands.cfg
#'check_passwd 'command definintion
define command{
command_name check_passwd
command_line $USER1$/check_passwd -H $HOSTADDRESS$ -c $ARG1$
}
[root@centos6 Nagios-Server]#/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
[root@centos6 Nagios-Server]#/etc/init.d/nagios reload具体操作是这样先添加主机、再添加服务、然后添加命令；检查配置最后重载Nagios服务。
备注：可能会出现的故障（有些是关于NRPE错误）
1，登录web界面的时候提示错误：
解决：
vim /usr/local/nagios/etc/cgi.cfg
把所有关于nagiosadmin改成你自己添加的用户名，重启服务即可。2，command 'check_Passwd' not define
解决：
cd /usr/local/nagios/etc/objects/ commands.cfg 把它定义好就可以了。3，Connction refurse host
解决：
cd /usr/local/nagios/libexec 下，使用 ./check_nrpe -H 192.168.0.150 -c check_ping 或者./check_nrpe -H 127.0.0.1 -c check_ping
如果还是提示Connction refurse host；接下来查看NRPE有没有启动：netstat -lntup |grep nrpe 如果没有启动执行
/usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe.cfg -d 然后再执行./check_nrpe -H 192.168.0.150 -c check_ping 4，NRPE command 'check_disk' not define
解决：
先ps -ef |grep nrpe
pkill nrpe
/usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe.cfg -d
ps -ef |grep nrpe
然后再获取./check_nrpe -H 192.168.0.150 -c check_disk5，CHECK_NRPE: Error - Could not complete SSL handshake.
解决：
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 nrpe6，NRPE: Unable to read output
解决：
./check_nrpe -H 192.168.0.150 -c check_emm 如果还提示NRPE: Unable to read output然后
直接到里面/usr/local/nagios/libexec/check_memory.pl -w 6% -c 3% 如果提示Permission denied
说明 /usr/local/nagios/libexec/check_memory.pl -w 6% -c 3% 没有执行的权限
chmod +x /usr/local/nagios/libexec/check_memory.pl -w 6% -c 3%7，Whoops!Error: Could not read host and service status information!错误
解决：
先检查配置文件，检查nagios进程，检查httpd进程；结果是开启nagios服务后即可
[root@Nagios-Server ~]# /etc/init.d/nagios start