Performance, Nagios Email Notification Setting

외부 SMTP를 이용하기 위해서 SendMail 설치

$ sudo apt-get install sendemail

/etc/nagios3/conf.d/contacts_nagios2.cfg 파일 수정

• 옵션 설정과 email 설정
  

###############################################################################
###############################################################################
#
# CONTACTS
#
###############################################################################
###############################################################################

# In this simple config file, a single contact will receive all alerts.

define contact{
        contact_name                                       nagiosadmin
        alias                                                      NagiosAdmin
        service_notification_period                   24x7
        host_notification_period                       24x7
        service_notification_options                 w,u,c,r
        host_notification_options                     d,r
        service_notification_commands          notify-service-by-email
        host_notification_commands              notify-host-by-email
        email                                                   yongho1037@gmail.com
        }



###############################################################################
###############################################################################
#
# CONTACT GROUPS
#
###############################################################################
###############################################################################

# We only have one contact in this simple configuration file, so there is
# no need to create more than one contact group.

define contactgroup{
        contactgroup_name        admins
        alias                                Nagios Administrators
        members                         nagiosadmin
        }

• contact 설정을 타입별로 따로 설정 후 contactgroup으로 묶어서 용도 별로 사용할 수도 있다.
  

/etc/nagios3/conf.d/generic_service_nagios2.cfg와 /etc/nagios3/conf.d/generic_host_nagios2.cfg 수정

# generic service template definition
define service{
        name                                            generic-service ; The 'name' of this service template
        active_checks_enabled                1       ; Active service checks are enabled
        passive_checks_enabled             1       ; Passive service checks are enabled/accepted
        parallelize_check                          1       ; Active service checks should be parallelized (disabling this can lead to major performance problems)
        obsess_over_service                    1       ; We should obsess over this service (if necessary)
        check_freshness                          0       ; Default is to NOT check service 'freshness'
        notifications_enabled                   1       ; Service notifications are enabled
        event_handler_enabled               1       ; Service event handler is enabled
        flap_detection_enabled                1       ; Flap detection is enabled
        failure_prediction_enabled           1       ; Failure prediction is enabled
        process_perf_data                       1       ; Process performance data
        retain_status_information             1       ; Retain status information across program restarts
        retain_nonstatus_information       1       ; Retain non-status information across program restarts
                notification_interval               60              ; Only send notifications on status change by default.
                is_volatile                              0
                check_period                        24x7
                normal_check_interval          5
                retry_check_interval             1
                max_check_attempts            4
                notification_period                24x7
                notification_options              w,u,c,r,f,s
                contact_groups                    admins
        register                                        0       ; DONT REGISTER THIS DEFINITION - ITS NOT A REAL SERVICE, JUST A TEMPLATE!
        }

• 노란색으로 표시한 옵션들이 중요하다고 생각하는 부분이다.
  
• contact_groups가 앞서 설정한 contact 그룹과 일치 해야 설정한 이메일로 메일이 오게 되고, notification_options 값에 따라 메일을 보내는 타이밍이 결정된다.  그리고 notifications_enabled 값이 1일 경우 이메일 알림이 활성화, 0일 경우에는 비활성화이다.
  
• host 설정도 service와 거의 비슷하므로 pass

/etc/nagios3/commands.cfg

• "printf "메일본문" | sendemail -s SMTP주소 -xu SMTP계정 -xp SMTP패스워드 -l 로그가 저장 될 경로 -f 송신자 -t 수신자 -u 메일제목"의 형식
  

define command{
        command_name    notify-host-by-email
        command_line    /usr/bin/printf "%b" \
         "***** Nagios *****\n\n"\
        "Notification Type: $NOTIFICATIONTYPE$\n" \
        "Host: $HOSTNAME$\n" \
        "State: $HOSTSTATE$\n" \
        "Address: $HOSTADDRESS$\n" \
        "Info: $HOSTOUTPUT$\n\n" \
        "Date/Time: $LONGDATETIME$\n" \
        | /usr/bin/sendemail -s $USER5$ -xu $USER7$ -xp $USER8$ \
        -l /var/log/sendemail \
        -f $USER6$ \
        -t $CONTACTEMAIL$ \
        -u "** $NOTIFICATIONTYPE$ Host Alert: $HOSTNAME$ is $HOSTSTATE$ **"
        }

# 'notify-service-by-email' command definition
define command{
        command_name    notify-service-by-email
        command_line    /usr/bin/printf "%b" \
        "***** Nagios *****\n\n" \
        "Notification Type: $NOTIFICATIONTYPE$\n\n" \
        "Service: $SERVICEDESC$\n" \
        "Host: $HOSTALIAS$\n" \
        "Address: $HOSTADDRESS$\n" \
        "State: $SERVICESTATE$\n\n" \
        "Date/Time: $LONGDATETIME$\n\n" \
        "Additional Info:\n\n" \
        "$SERVICEOUTPUT$\n" \
        | /usr/bin/sendemail -s $USER5$ -xu $USER7$ -xp $USER8$ \
        -l /var/log/sendemail \
        -f $USER6$ \
        -t $CONTACTEMAIL$ \
        -u "** $NOTIFICATIONTYPE$ Service Alert: $HOSTALIAS$/$SERVICEDESC$ is $SERVICESTATE$ **"
        }

/etc/nagios3/resource.cfg

• 위의 commands.cfg에서 사용 할 $USERn$ 형식의 매크로 값을 지정한다. 
• $USER1$ ~ $USER32$ 까지 예약어이므로 임의의 다른 형태를 사용할 수는 없다.
  

# Mail Setting
$USER5$=smtp.gmail.com
$USER6$=yongho1037@gmail.com
$USER7$=yongho1037@gmail.com
$USER8$=password

Nagios 재시작

$ sudo service nagios3 restart

메일 확인