http://www.codeweblog.com/nagios%E5%AE%89%E8%A3%85%E9%85%8D%E7%BD%AE/
上线的服务器有时会被人攻击，导致服务不可用，今天安装配置了nagios对上线服务器进行监控，简单记录一下
#安装必要的软件包
yum install -y gcc glibc glibc-common gd gd-devel xinetd openssl-devel
#创建nagios用户及授予目录权限
useradd -s /sbin/nologin nagios
mkdir /usr/local/nagios
chown -R nagios.nagios /usr/local/nagios
#安装nagios
tar xf nagios-4.0.7.tar.gz
cd nagios-4.0.7
./configure --prefix=/usr/local/nagios
make all
make install && make install-init && make install-commandmode && make install-config
chkconfig --add nagios && chkconfig --level 35 nagios on && chkconfig --list nagios
#安装nagios-plugins
tar xf nagios-plugins-2.0.2.tar.gz
cd nagios-plugins-2.0.2
./configure --prefix=/usr/local/nagios
make && make install
#安装apache
tar xf httpd-2.2.23.tar.gz
cd httpd-2.2.23
./configure --prefix=/usr/local/apache2
make && make install
#安装php
tar xf php-5.5.13.tar.gz
cd php-5.5.13
./configure --prefix=/usr/local/php --with-apxs2=/usr/local/apache2/bin/apxs
make && make install
接下来配置apache
#生成nagios密码文件
/usr/local/apache2/bin/htpasswd -c /usr/local/nagios/etc/htpasswd admin
vim /usr/local/apache2/conf/httpd.conf
...
User nagios
Group nagios
...
<IfModule dir_module>
DirectoryIndex index.html index.php
</IfModule>
...
AddType application/x-httpd-php .php
...
#setting for nagios
ScriptAlias /nagios/cgi-bin "/usr/local/nagios/sbin"
<Directory "/usr/local/nagios/sbin">
AuthType Basic
Options ExecCGI
AllowOverride None
Order allow,deny
Allow from all
AuthName "Nagios Access"
AuthUserFile /usr/local/nagios/etc/htpasswd //用于此目录访问身份验证的文件
Require valid-user
</Directory> Alias /nagios "/usr/local/nagios/share"
<Directory "/usr/local/nagios/share">
AuthType Basic
Options None
AllowOverride None
Order allow,deny
Allow from all
AuthName "nagios Access"
AuthUserFile /usr/local/nagios/etc/htpasswd
Require valid-user
</Directory> #启动apache
vim /etc/init.d/httpd
#!/bin/sh
#
# Startup script for the Apache Web Server
#
# chkconfig: 345 85 15
# description: Apache is a World Wide Web server. It is used to serve \
# HTML files and CGI.
# processname: httpd
# pidfile: /usr/local/apache2/logs/httpd.pid
# config: /usr/local/apache2/conf/httpd.conf# Source function library.
. /etc/rc.d/init.d/functions# See how we were called.
case "$1" in
start)
echo -n "Starting httpd: "
daemon /usr/local/apache2/bin/httpd -DSSL
echo
touch /var/lock/subsys/httpd
;;
stop)
echo -n "Shutting down http: "
killproc httpd
echo
rm -f /var/lock/subsys/httpd
rm -f /usr/local/apache2/logs/httpd.pid
;;
status)
status httpd
;;
restart)
$0 stop
$0 start
;;
reload)
echo -n "Reloading httpd: "
killproc httpd -HUP
echo
;;
*)
echo "Usage: $0 {start|stop|restart|reload|status}"
exit 1
esacexit 0chmod +x /etc/init.d/httpd
chkconfig httpd on
/etc/init.d/httpd start
接下来配置nagios
#确保admin用户登录后有权限查看信息
vim /usr/local/nagios/etc/cgi.cfg
...
default_user_name=admin
authorized_for_system_information=nagiosadmin,admin
authorized_for_configuration_information=nagiosadmin,admin
authorized_for_system_commands=admin
authorized_for_all_services=nagiosadmin,admin
authorized_for_all_hosts=nagiosadmin,admin
authorized_for_all_service_commands=nagiosadmin,admin
authorized_for_all_host_commands=nagiosadmin,admin
...#修改nagios主配置文件，将主机的定义都放在/usr/local/nagios/etc/hosts目录中
mkdir /usr/local/nagios/etc/hosts
vim /usr/local/nagios/etc/nagios.cfg
...
cfg_dir=/usr/local/nagios/etc/hosts
...#添加一个自定义命令
vim /usr/local/nagios/etc/objects/command.cfg...
# 'check_custom_http' command definition
define command{
command_name check_custom_http
command_line $USER1$/check_http -4 -N -H $ARG1$ -u $ARG2$
}# 'check_dns' command definition
define command{
command_name check_dns
command_line $USER1$/check_dns -v -H $ARG1$ -a $ARG2$ -w $ARG3$ -c $ARG4$
}
...#定义主机组
vim /usr/local/nagios/etc/hosts/group.cfgdefine hostgroup{
hostgroup_name groupname1
alias groupname1
members server1 #server1必须在/etc/hosts里有对应的映射
}#定义主机server1
vim /usr/local/nagios/etc/hosts/server1.cfgdefine host{
use linux-server
host_name server1
alias server1
address xx.xx.xx.xx
notification_period 24x7
}
define service{
use local-service ; Name of service template to use
host_name server1
service_description PING
check_command check_ping!100.0,20%!500.0,60% ; 延时100ms丢包率大于20%时，则发出警告通知; 延时500ms丢包率大于60%时，则发出严重错误通知
}
;需要做好本机使用的DNS设置，在/etc/resolv.conf文件中定义
define service{
use local-service ; Name of service template to use
host_name server1
service_description DNS
check_command check_dns!xxx.test.com!xx.xx.xx.xx!4!10 ;连续解析域名发生4次错误，则发出警告通知；连续解析域名发生10次错误，则发出严重错误通知；
}
define service{
use local-service ; Name of service template to use
host_name server1
service_description HTTP
check_command check_custom_http!xxx.abc.com!/somepath/path1 ;注意这里的参数要以!分隔
}
define service{
use local-service ; Name of service template to use
host_name server1
service_description SSH
check_command check_ssh
}#配置监控出现问题时要通知的联系人
vim /usr/local/nagios/etc/objects/contacts.cfgdefine contact{
contact_name user1 ; Short name of user
use generic-contact ; Inherit default values from generic-contact template (defined above)
alias user1 ; Full name of user email user1@abc.com ; <<***** CHANGE THIS TO YOUR EMAIL ADDRESS ******
}define contact{
contact_name user2 ; Short name of user
use generic-contact ; Inherit default values from generic-contact template (defined above)
alias user2 ; Full name of user email user2@abc.com ; <<***** CHANGE THIS TO YOUR EMAIL ADDRESS ******
} define contactgroup{
contactgroup_name admins
alias Nagios Administrators
members user1,user2
} 重启nagios
/etc/init.d/nagios restart
刚才发现nagios监控到服务器异常也没有发邮件通知，查了一下，还需要配置mail命令可发送邮件
yum install mail
vim /etc/mail.rc
...
set from=abc-noreply@abc.com
set smtp=smtp.abc.com
set smtp-auth-user=abc-noreply@abc.com
set smtp-auth-password=somepwd
set smtp-auth=login
...
