Nagios監控搭建和配置(筆記)

   廢話不多說,本博文純屬於個人筆記,可能會出現雜亂無章的感覺,只是把遇到的問題一一的記錄下來,方便日後查看,也能幫助遇到類型問題的還在糾結的人。


系統版本及信息

cat /etc/redhat-release 
CentOS release 6.2 (Final)

uname -a
Linux  2.6.32-220.el6.x86_64  x86_64 x86_64 x86_64 GNU/Linux

ifconfig |sed -n 1,2p
eth0      Link encap:Ethernet  HWaddr 40:F2:E9:29:5F:EA  
          inet addr:192.168.0.2  Bcast:192.168.69.255  Mask:255.255.255.0
          
關閉 Iptables  selinux

 軟件版本信息

LAMP/LNMP 忽略,任何一個環境都可以,我這裏是yum 安裝的LNMP環境
nagios-4.0.5.tar.gz
nagios-plugins-1.4.16.tar.gz
nrpe-2.15.tar.gz
pnp4nagios-0.6.19.tar.gz

安裝Nagios軟件準備工作

確保 yum 能正常使用,建議是配置網絡 yum ,安裝系統所需庫文件
yum groupinstall "Compatibility libraries" "Base" "Development tools"

安裝lamp及所需包

yum -y install http* php* mysql* perl* net-snmp* openssl* glibc rrdtoolrrdtool-devel rrdtool-perl rrdtool-php

chkconfig mysqld   on                     
chkconfig httpd    on
chkconfig snmpd   on
service httpd  start
service mysqld start
service snmpd start

測試ok 繼續下一步
ps -ef | grep -v grep | grep http mysql snmp #分別查看,web頁面訪問測試

安裝Nagios

1、創建nagios程序用戶、組
[root@nagios ~]# useradd -s /sbin/nologin nagios
[root@nagios ~]# mkdir /usr/local/nagios
[root@nagios ~]# chown -R nagios.nagios /usr/local/nagios/

2、編譯安裝nagios

[root@nagios tools]# tar zxf nagios-4.0.5.tar.gz
[root@nagios tools]# cd nagios-4.0.5
[root@nagios nagios-4.0.5]# ./configure --prefix=/usr/local/nagios
[root@nagios nagios-4.0.5]# make all &&make install && make install-init && make install-commandmode&& make install-config && make install-webconf
[root@nagios nagios-4.0.5]# echo $?
0
3、加入開機啓動
chkconfig --add nagios
chkconfig nagios on
chkconfig--list nagios

安裝nagios-plugins 插件

[root@nagios tools]# tar zxf nagios-plugins-1.4.16.tar.gz
[root@nagios tools]# cd nagios-plugins-1.4.16
[root@nagios tools nagios-plugins-1.4.16]# ./configure --prefix=/usr/local/nagios/
[root@nagios tools nagios-plugins-1.4.16]# make
[root@nagios tools nagios-plugins-1.4.16]# make install
[root@nagios tools nagios-plugins-1.4.16]# echo $?
0

編輯http.conf配置文件


cd /etc/httpd/conf
cp -a httpd.conf httpd.conf.bak

vim httpd.conf # 添加在最後面即可

####### 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
Require valid-user
</Directory>
Alias /nagios "/usr/local/nagios/share"
<Directory "/usr/local/nagios/share">
AuthType Basic
Options ExecCGI
AllowOverride None
Order allow,deny
Allow from all
AuthName "nagios access"
AuthUserFile /usr/local/nagios/etc/htpasswd
Require valid-user
</Directory>

修改
DirectoryIndex index.html index.html.var
爲
DirectoryIndex index.php index.html index.html.var

修改
Options Indexes FollowSymLinks
爲
Options FollowSymLinks    #防止網站列目錄

service httpd restart 

增加nagios登陸認證文件,一定要用默認的nagiosadmin作爲用戶,否則需要修改其他文件,修改之前備份,這裏就不備份了

[root@nagios etc]# cd /usr/local/nagios/etc
[root@nagios etc]# sed -i s@nagiosadmin@nagiosadmin\,admin@g cgi.cfg
[root@nagios etc]# sed -i s@\#default_user_name=guest@default_user_name=admin@g cgi.cfg
[root@nagios nagios]# htpasswd -c /usr/local/nagios/etc/htpasswd admin
New password: ******
Re-type new password:******

安裝 Nrpe 插件


[root@nagios tools]# tar zxf nrpe-2.15.tar.gz
[root@nagios tools]# cd nrpe-2.15
[root@nagios nrpe-2.15]# ./configure;make all;make install-plugin;make install-daemon;make install-daemon-config

啓動Nrpe

[root@nagios nrpe-2.15]# /usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe.cfg -d
[root@nagios nrpe-2.15]# netstat -antl |grep 5666
tcp        0      0 0.0.0.0:5666                0.0.0.0:*                   LISTEN  
[root@nagios libexec]#/usr/local/nagios/libexec/check_nrpe -H 127.0.0.1
NRPE v2.15

關閉Nrpe

[root@nagios libexec]# ps -ef | grep -v grep | grep nrpe
[root@nagios libexec]# kill -9 進程號


檢測nagios

[root@nagios etc]# /usr/local/nagios/bin/nagios-v /usr/local/nagios/etc/nagios.cfg
Total Warnings: 0
Total Errors:   0 表示OK

啓動nagios

[root@nagios etc]# service nagios start  stop  restart 開啓  停止  重啓

http://IP/nagios

安裝 pnp4nagios 插件

[root@nagios tools]# tar zxf pnp4nagios-0.6.19.tar.gz
[root@nagios tools]# cd pnp4nagios-0.6.19
[root@nagios tools pnp4nagios-0.6.19]#./configure
make all
make install
make install-config
make install-init
make install-webconf

創建默認配置文件
cd /usr/local/pnp4nagios/etc
cp misccommands.cfg-sample misccommands.cfg
cp nagios.cfg-sample nagios.cfg
cp rra.cfg-sample rra.cfg
cd pages
cp web_traffic.cfg-sample web_traffic.cfg
cd ../check_commands/
cp check_all_local_disks.cfg-samplecheck_all_local_disks.cfg
cp check_nrpe.cfg-sample check_nrpe.cfg
cp check_nwstat.cfg-sample check_nwstat.cfg
cp /usr/local/pnp4nagios/libexec/* /usr/local/nagios/libexec/

vim /usr/local/nagios/etc/nagios.cfg
檢查
enable_environment_macros=1
process_performance_data=1          
host_perfdata_command=process-host-perfdata
service_perfdata_command=process-service-perfdata

提示:如果nagios版本是4.X,上面配置會導致後面,生成不了流量圖,報如下錯誤

PNP4Nagios Version 0.6.19
Please check the documentation for information about the following error.
perfdata directory "/usr/local/pnp4nagios/var/perfdata/localhost" for host "localhost" does not exist.Read FAQ online
file [line]:
application/models/data.php [148]:
back

wKiom1REskLzmcPPAAFuqJPFemo618.jpg

出現這個錯誤的原因是參照
解決方案是使用 Bulk Mode方式

vim /usr/local/nagios/etc/nagios.cfg

檢查
enable_environment_macros=1
process_performance_data=1 

添加到最後即可
# service performance data

service_perfdata_file=/usr/local/pnp4nagios/var/service-perfdata
service_perfdata_file_template=DATATYPE::SERVICEPERFDATA\tTIMET::$TIMET$\tHOSTNAME::$HOSTNAME$\tSERVICEDESC::$SERVICEDESC$\tSERVICEPERFDATA::$SERVICEPERFDATA$\tSERVICECHECKCOMMAND::$SERVICECHECKCOMMAND$\tHOSTSTATE::$HOSTSTATE$\tHOSTSTATETYPE::$HOSTSTATETYPE$\tSERVICESTATE::$SERVICESTATE$\tSERVICESTATETYPE::$SERVICESTATETYPE$
service_perfdata_file_mode=a
service_perfdata_file_processing_interval=15
service_perfdata_file_processing_command=process-service-perfdata-file

# host performance data starting with Nagios 3.0

host_perfdata_file=/usr/local/pnp4nagios/var/host-perfdata
host_perfdata_file_template=DATATYPE::HOSTPERFDATA\tTIMET::$TIMET$\tHOSTNAME::$HOSTNAME$\tHOSTPERFDATA::$HOSTPERFDATA$\tHOSTCHECKCOMMAND::$HOSTCHECKCOMMAND$\tHOSTSTATE::$HOSTSTATE$\tHOSTSTATETYPE::$HOSTSTATETYPE$
host_perfdata_file_mode=a
host_perfdata_file_processing_interval=15
host_perfdata_file_processing_command=process-host-perfdata-file
保存

vim  /usr/local/nagios/etc/objects/commands.cfg
define command{
       command_name    check_nrpe
       command_line    $USER1$/check_nrpe-H $HOSTADDRESS$ -c $ARG1$
} #這一段放在上面即可

如下:同步模式設定方法添加到末尾就可以,記住在這個配置文件裏面, 默認有這個配置,需要找到註釋掉,然後將下面的配置添加,如果不註釋掉,在你檢查nagios的配置文件的時候會報錯

define command{
       command_name    process-service-perfdata-file
       command_line    /usr/local/pnp4nagios/libexec/process_perfdata.pl --bulk=/usr/local/pnp4nagios/var/service-perfdata
}

define command{
       command_name    process-host-perfdata-file
       command_line    /usr/local/pnp4nagios/libexec/process_perfdata.pl --bulk=/usr/local/pnp4nagios/var/host-perfdata
}

定義pnp的主機和服務兩個模版添加在最後面
 
vim /usr/local/nagios/etc/objects/templates.cfg
define host {
  name       host-pnp
  action_url /pnp4nagios/index.php/graph?host=$HOSTNAME$&srv=_HOST_
  register  0
}
define service {
  name       service-pnp
  action_url /pnp4nagios/index.php/graph?host=$HOSTNAME$&srv=$SERVICEDESC$
  register  0
}

也可以添加在,其他參數下面省略了,下面這個方法可以減少很多配置主機啓用pnp時的時間
vim /usr/local/nagios/etc/objects/templates.cfg
define host {

        action_url /pnp4nagios/index.php/graph?host=$HOSTNAME$&srv=_HOST_
}
define service {
        
       action_url /pnp4nagios/index.php/graph?host=$HOSTNAME$&srv=$SERVICEDESC$  
}


先做一下pnp4nagios環境測試添加在httpd.conf最後面


vim /etc/httpd/conf/httpd.conf

Alias /pnp4nagios "/usr/local/pnp4nagios/share"
<Directory"/usr/local/pnp4nagios/share">
AllowOverride None
Order allow,deny
Allow from all
AuthName "Nagios Access"
AuthType Basic
AuthUserFile /usr/local/nagios/etc/htpasswd
Require valid-user
</Directory>
 
<IFModule mode_rewrite.c>
RewirteEngine On
Options FollowSymLinks
RewirteBase /pnp4nagios
 RewirteRule ^(application|modules|system) -[F,L]
RewirteCond %{REQUEST_FILENAME} !-f
RewirteCond %{REQUEST_FILENAME} !-d
RewirteRule .* index.php/$0 [PT,L]
</IfModule>

service httpd restart

訪問 http://IP/pnp4nagios

wKioL1REuA-DLKfLAAIE4Az2fSw125.jpg

cd /usr/local/pnp4nagios/share/

mv install.php install.php.bak


編輯nagios.cfg文件

vim /usr/local/nagios/etc/nagios.cfg

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/localhost.cfg
cfg_file=/usr/local/nagios/etc/objects/hosts.cfg
cfg_file=/usr/local/nagios/etc/objects/hostgroup.cfg
cfg_file=/usr/local/nagios/etc/objects/services.cfg

或者
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/localhost.cfg

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


提示:此操作只是啓用了linux主機監控,沒有啓用windows和switch,如果需要把註釋去掉即可,第一種和第二種都可以
區別是:第一種共同使用一個配置文件,第二種獨立使用配置文件,這裏我都會演示,下面以第一種和第二種進行區分

添加主機配置,第一種方法

默認nagios/etc/objects/ 下面沒有 service.cfg host.cfg hostgroup.cfg 這幾個配置文件,需要手動添加

vim hosts.cfg
 
define host{
         use                      linux-server,host-pnp #這個是根據templates.cfg信息定義,如果上面定義的模板host-pnp添加在define host和define sevice裏面,這兒host-pnp可以不用加,因爲linux-server已經包含了
         host_name                cacti                 #必須是 被監控的主機名
         alias                    cacti-web             #別名隨便定義
         address                  192.168.0.3           #主機ip地址
         contact_groups           admins                #郵件組,下面會演示
}
define host{
         use                      linux-server,host-pnp 
         host_name                nginx                 
         alias                    nginx-web             
         address                  192.168.0.4           
         contact_groups           admins                
}
有多少機器就這樣添加多少臺

vim hostgroup.cfg
define hostgroup{
         hostgroup_name      servers                   #組名
         alias               servers_group             #別名
         members             cacti,nginx               #主機名 多個 逗號 隔開
}

vim service.cfg          #所有主機在同一配置文件,很亂

#### set cacti host  
define service{
         use                  local-service,services-pnp
         host_name            cacti
         service_description  http
         check_command        check_http
         contact_groups       admins
         flap_detection_enabled          0
}
 
define service{
         use                   local-service,services-pnp
         host_name             cacti
         service_description   SSH_port
         check_command         check_tcp!22 
         contact_groups        admins
         flap_detection_enabled          0
}
define service{
       use                      local-service,services-pnp
       host_name                cacti
       service_description      check_/
       check_command            check_nrpe!check_/  #使用nrpe檢測,客戶端需要定義
       contact_groups           admins
       flap_detection_enabled   0
}
    
#### set nginx host

define service{
        use                      local-service,service-pnp
        host_name                nginx
        service_description      Check_free_mem
        check_command            check_nrpe!check_free_mem
        contact_groups           admins
        flap_detection_enabled   0
}
 define service{
       use                      local-service,services-pnp
       host_name                nginx
       service_description      check_/
       check_command            check_nrpe!check_/  #使用nrpe檢測,客戶端需要定義
       contact_groups           admins
       flap_detection_enabled   0            
}
有多少就需要添加多少,第一種方法 end

添加主機配置,第二種方法

cd nagios/etc/objects/
mkdir app
cd app

vim 192.168.0.2.cfg  #在一個獨立的文件定義所有監控對象,這個沒有定義組,意義不大

###定義host

define host{
         use                      linux-server,host-pnp #這個是根據templates.cfg信息定義,如果上面定義的模板host-pnp添加在define host和define sevice裏面,這兒host-pnp可以不用加,因爲linux-server已經包含了
         host_name                nginx                 #必須是 被監控的主機名
         alias                    nginx-web             #別名隨便定義
         address                  192.168.0.4           #主機ip地址
         contact_groups           admins                #郵件組,下面會演示
}

###定義service

define service{
        use                      local-service,service-pnp
        host_name                nginx
        service_description      Check_free_mem
        check_command            check_nrpe!check_free_mem
        contact_groups           admins
        flap_detection_enabled   0
}

 define service{
       use                      local-service,services-pnp
       host_name                nginx
       service_description      check_/
       check_command            check_nrpe!check_/  #使用nrpe檢測,客戶端需要定義
       contact_groups           admins
       flap_detection_enabled   0            
}
vim 192.168.0.3.cfg

###定義host

define host{
         use                      linux-server,host-pnp #這個是根據templates.cfg信息定義,如果上面定義的模板host-pnp添加在define host和define sevice裏面,這兒host-pnp可以不用加,因爲linux-server已經包含了
         host_name                cacti                 #必須是 被監控的主機名
         alias                    cacti-web             #別名隨便定義
         address                  192.168.0.3           #主機ip地址
         contact_groups           admins                #郵件組,下面會演示
}

###定義service

define service{
        use                      local-service,service-pnp
        host_name                cacti
        service_description      Check_free_mem
        check_command            check_nrpe!check_free_mem
        contact_groups           admins
        flap_detection_enabled   0
}

define service{
        use                      local-service,service-pnp
        host_name                cacti
        service_description      Check_free_mem
        check_command            check_nrpe!check_free_mem
        contact_groups           admins
        flap_detection_enabled   0
}

這種辦法比第一種方便許多,添加主機2種方法 END

nagios郵件報警設置

[root@nagios objects]# vim contacts.cfg  #參數詳解,請百度
define contact{
       contact_name                   nagiosadmin    
       use                            generic-contact       
       alias                          Nagios Admin                                              service_notification_period        24x7
       host_notification_period           24x7
       service_notification_options       w,u,c,r
       host_notification_options          d,u,r
       service_notification_commands      notify-service-by-email        
       host_notification_commands         notify-host-by-email
       email                              [email protected]  
       }
define contactgroup{
       contactgroup_name          admins  #這個就是上面那個admins
       alias                      Nagios Administrators
       members                    nagiosadmin
       }

檢查配置文件是否有錯

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


Total Warnings: 0
Total Errors:   0

Things look okay - No serious problems were detected during the pre-flight check

service nagios restart

服務端配置 end

 客戶端安裝配置

需要安裝net-snmp,如果有其他錯誤根據提示進行解決
yum -y install net-snmp*

1、創建nagios程序用戶、組
[root@nagios ~]# useradd -s /sbin/nologin nagios
[root@nagios ~]# mkdir /usr/local/nagios
[root@nagios ~]# chown -R nagios.nagios /usr/local/nagios/

2、安裝nagios-plugins 插件
[root@nagios tools]# tar zxf nagios-plugins-1.4.16.tar.gz
[root@nagios tools]# cd nagios-plugins-1.4.16
[root@nagios tools nagios-plugins-1.4.16]# ./configure --prefix=/usr/local/nagios/
[root@nagios tools nagios-plugins-1.4.16]# make
[root@nagios tools nagios-plugins-1.4.16]# make install
[root@nagios tools nagios-plugins-1.4.16]# echo $?
0

3、安裝 Nrpe 插件
[root@nagios tools]# tar zxf nrpe-2.15.tar.gz
[root@nagios tools]# cd nrpe-2.15
[root@nagios nrpe-2.15]# ./configure;make all;make install-plugin;make install-daemon;make install-daemon-config

編輯nrpe.cfg

sed -I 's/allowed_hosts=127.0.0.1/allowed_hosts=127.0.0.1,192.168.0.2/g' /usr/local/nagios/etc/nrpe.cfg

vim /usr/local/nagios/etc/nrpe.cfg

command[check_swap]=/usr/local/nagios/libexec/check_swap -w 20% -c 10%
command[check_data]=/usr/local/nagios/libexec/check_disk -w 20% -c 10% -p /data
command[check_/]=/usr/local/nagios/libexec/check_disk -w 20% -c 10% -p /
command[check_zombie_procs]=/usr/local/nagios/libexec/check_procs -w 5 -c 10 -s Z
command[check_total_procs]=/usr/local/nagios/libexec/check_procs -w 150 -c 200 
保存

echo "/usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe.cfg-d" >> /etc/rc.local

啓動Nrpe

[root@nagios nrpe-2.15]# /usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe.cfg -d
[root@nagios nrpe-2.15]# netstat -antl |grep 5666
tcp        0      0 0.0.0.0:5666                0.0.0.0:*                   LISTEN  

這個在服務端操作,確保ok,如果不能請檢查客戶端防火牆和網絡是否允許通信

[root@nagios libexec]#/usr/local/nagios/libexec/check_nrpe -H 192.168.0.3
NRPE v2.15

關閉Nrpe

[root@nagios libexec]# ps -ef | grep -v grep | grep nrpe
[root@nagios libexec]# kill -9 進程號


pnp不出圖時候,查看日誌

vim /usr/local/pnp4nagios/etc/process_perfdata.cfg

修改

LOG_LEVEL = 0

LOG_LEVEL = 2

more /usr/local/pnp4nagios/var/perfdata.log


提示:nagios 監控進程時候,即便pnp配置ok,也不會出圖,例如下面的

Total Processes
Perform Extra Service Actions
OK10-20-2014 16:44:4583d 1h 9m 16s1/3PROCS OK: 503 processes 
zombie_procs
Perform Extra Service Actions
OK10-20-2014 16:46:0083d 1h 7m 58s1/3PROCS OK: 0 processes with STATE = Z

PNP4Nagios Version 0.6.19

Please check the documentation for information about the following error.

XML file "/usr/local/pnp4nagios/var/perfdata/app-11/Total_Processes.xml" not found. Read FAQ online

file [line]:

application/models/data.php [312]:

back

wKiom1REzjDQhqLXAAFDVw5NQ54404.jpg

至於原因可以參考,非常詳細

http://storysky.blog.51cto.com/628458/583787/


Nagios如果系統監控插件滿足不了需求,可以自行開發插件


例如下面是一個內存監控插件,插件是百度找的還是不錯的,我這裏借用一下

vim /usr/local/nagios/libexec/check_mem

#!/bin/bash
STAT_OK=0
STAT_WARNING=1
STAT_CRITICAL=2
STAT_UNKNOWN=3

total_mem=`free -m |awk 'NR==2{print $2}'`
used_mem=`free -m |awk 'NR==3{print $3}'` #取的是系統真正用掉的內存
free_mem=`free -m |awk 'NR==3{print $4}'` #取的是free+cache的內存
use_per=`echo "scale=2;$used_mem/$total_mem"|bc|sed 's/^.//g'`

help() {
        echo "USAGE:`basename $0` [-w] <used percent> [-c] <used percent> [-h]"
        exit -1
}

while getopts ":w:c:h" opt
do
        case $opt in
                w)      warning=$OPTARG
                        ;;
                c)      critical=$OPTARG
                        ;;
                h)      help
                        ;;
                ?)      unkown=$OPTARG
                        echo "error,plase check for help,USAGE:./`basename $0` -h"
                        exit $STAT_UNKNOWN
                        ;;
        esac
done


if [[ $use_per -lt $warning ]];
then
        echo "OK - total:$total_mem MB,used:$used_mem MB,free:$free_mem MB | total_mem=$total_mem used_mem=$used_mem free_mem=$free_mem"
        exit $STAT_OK

elif [[ $use_per -ge $warning ]] && [[ $use_per -lt $critical ]];
then
                 echo "WARNING - total:$total_mem MB,used:$used_mem MB,free:$free_mem MB | total_mem=$total_mem used_mem=$used_mem free_mem=$free_mem"
                 exit $STAT_WARNING
else
                 echo "CRITICAL - total:$total_mem MB,used:$used_mem MB,free:$free_mem MB | total_mem=$total_mem used_mem=$used_mem free_mem=$free_mem"
                 exit $STAT_CRITICAL
        fi
fi
保存

chown nagios.nagios check_mem
chmod +x check_mem
./check_mem -w 80 -c 90
OK - total:15926 MB,used:1839 MB,free:14086 MB | total_mem=15926 used_mem=1839 free_mem=14086

vim /usr/local/nagios/etc/nrpe.cfg

添加
command[check_free_mem]=/usr/local/nagios/libexec/check_mem -w 80 -c 90

重啓nrpe

在編輯/usr/local/nagios/etc/objects/app/的文件
添加
define service{
        use                      local-service,service-pnp
        host_name                cacti
        service_description      Check_free_mem
        check_command            check_nrpe!check_free_mem
        contact_groups           admins
        flap_detection_enabled   0
}

檢查nagios 重啓nagios


   Windows和交換機監控配置不難,只要思路清晰,肯定能弄出來,nagios配置其實不難,就是有點麻煩而已,只要把配置文件的關係弄明白,一切都很簡單


到此全部結束





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