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centos7下搭建cacti

cacti

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什么是Cacti?

Cacti 在英文中的意思是仙人掌的意思,Cacti是一套基于PHP,MySQL,SNMP及RRDTool開發的網絡流量監測圖形分析工具。它通過snmpget來獲取數據,使用RRDtool繪畫圖形,而且你完全可以不需要了解RRDtool復雜的參數。它提供了非常強大的數據和用戶管理功能,可以指定每一個用戶能查看樹狀結構、host以及任何一張圖,還可以與LDAP結合進行用戶驗證,同時也能自己增加模板,功能非常強大完善。Cacti的發展是基于讓RRDTool使用者更方便使用該軟件,除了基本的Snmp流量跟系統資訊監控外,Cacti也可外掛Scripts及加上Templates來作出各式各樣的監控圖。

cacti是用php語言實現的一個軟件,它的主要功能是用snmp服務獲取數據,然后用rrdtool儲存和更新數據,當用戶需要查看數據的時候用rrdtool生成圖表呈現給用戶。因此,snmp和rrdtool是cacti的關鍵。Snmp關系著數據的收集,rrdtool關系著數據存儲和圖表的生成。

Mysql配合PHP程序存儲一些變量數據并對變量數據進行調用,如:主機名、主機ip、snmp團體名、端口號、模板信息等變量。

snmp抓到數據不是存儲在mysql中,而是存在rrdtool生成的rrd文件中(在cacti根目錄的rra文件夾下)。rrdtool對數據的更新和存儲就是對rrd文件的處理,rrd文件是大小固定的檔案文件(Round Robin Archive),它能夠存儲的數據筆數在創建時就已經定義。關于RRDTool的知識請參閱RRDTool教學。

 

什么是SNMP?

snmp(Simple Network Management Protocal, 簡單網絡管理協議)在架構體系的監控子系統中將扮演重要角色。大體上,其基本原理是,在每一個被監控的主機或節點上(如交換機)都運行了一個agent,用來收集這個節點的所有相關的信息,同時監聽snmp的port,也就是UDP 161,并從這個端口接收來自監控主機的指令(查詢和設置)。

如果安裝 net-snmp,被監控主機需要安裝net-snmp(包含了snmpd這個agent),而監控端需要安裝net-snmp-utils,若接受被監控端通過trap-communicate發來的信息的話,則需要安裝net-snmp,并啟用trap服務。如果自行編譯,需要beecrypt(libbeecrypt)和elf(libraryelf)的庫。

 

 

什么是RRDtools?

RRDtool是指Round Robin Database工具(環狀數據庫)。Round robin是一種處理定量數據、以及當前元素指針的技術。想象一個周邊標有點的圓環--這些點就是時間存儲的位置。從圓心畫一條到圓周的某個點的箭頭--這就是指針。就像我們在一個圓環上一樣,沒有起點和終點,你可以一直往下走下去。過來一段時間,所有可用的位置都會被用過,該循環過程會自動重用原來的位置。這樣,數據集不會增大,并且不需要維護。RRDtool處理RRD數據庫。它用向RRD數據庫存儲數據、從RRD數據庫中提取數據。

centos7下搭建cacti

 

工作原理:

snmp關系著數據的收集,rrdtool關系數據存儲和圖表的生成,snmp抓取的數據不是存儲在數據庫中,而是存儲在rrdtool生成的rrd文件中,簡單原理圖如下:

centos7下搭建cacti 

 

實驗

 

1.搭建lamp環境

 

(1)配置apache

[root@cacti-server ~]# yum -y install httpd

[root@cacti-server ~]# systemctl start httpd

[root@cacti-server ~]# systemctl enable httpd

[root@cacti-server ~]# firewall-cmd --permanent --add-service=http

success

[root@cacti-server ~]# firewall-cmd --reload

success

 

(2)配置mariadb

[root@cacti-server ~]# yum -y install mariadb-server mysql-devel

[root@cacti-server ~]# systemctl start mariadb

[root@cacti-server ~]# mysql_secure_installation

Set root password? [Y/n]

Remove anonymous users? [Y/n] y

Disallow root login remotely? [Y/n] y

Remove test database and access to it? [Y/n] y

Reload privilege tables now? [Y/n] y

 

[root@cacti-server ~]# mysql -u root -p

MariaDB [(none)]> grant all privileges on *.* to test@localhost identified by 'redhat';#創建用于測試php和mariadb連通性的用戶

Query OK, 0 rows affected (0.00 sec)

MariaDB [(none)]> flush privileges;

 

[root@cacti-server ~]# systemctl restart mariadb

[root@cacti-server ~]# systemctl enable mariadb

[root@cacti-server ~]# firewall-cmd --permanent --add-port=3306/tcp

success

[root@cacti-server ~]# firewall-cmd --reload

success

 

(3)配置php

[root@cacti-server ~]# yum -y install php php-mysql php-gd php-pear

[root@cacti-server ~]# vim /etc/php.ini  

date.timezone =PRC    #修改時區

 

[root@cacti-server ~]# vim /var/www/html/index.php    #編輯測試頁面

<?php

    $conn=mysql_connect('localhost','test','redhat');

    if ($conn)

       echo "database connect ok";

    else

       echo "database connect failure";

?>

<?php

    phpinfo()

?>

 

[root@cacti-server ~]# systemctl restart httpd

 

(4)測試

centos7下搭建cacti 

 

 

2.安裝配置cacti

 

(1)下載軟件

[root@cacti-server ~]# cd /usr/local/src/

[root@cacti-server src]# wgethttp://www.cacti.net/downloads/cacti-0.8.8f.tar.gz

[root@cacti-server src]# tar zxvf cacti-0.8.8f.tar.gz

[root@cacti-server src]# mv cacti-0.8.8f /var/www/html/cacti

 

(2)創建cacti數據庫和cacti用戶,賦予權限

[root@cacti-server ~]# mysql -u root -p

MariaDB [(none)]> create database cacti default character set utf8;

MariaDB [(none)]> grant all privileges on cacti.* to cacti@localhost identified by 'redhat';

MariaDB [(none)]> flush privileges;

 

(3)把cacti.sql導入數據庫

[root@cacti-server cacti]# mysql -ucacti -predhat cacti < /var/www/html/cacti/cacti.sql

 

(4)編輯config.php和global.php

[root@cacti-server cacti]# vim /var/www/html/cacti/include/config.php|global.php

$database_type = "mysql";

$database_default = "cacti";

$database_hostname = "localhost";

$database_username = "cacti";

$database_password = "redhat";

$database_port = "3306";

$database_ssl = false;

 

(5)安裝rrdtool以生成圖像

[root@cacti-server src]# yum -y install rrdtool rrdtool-devel rrdtool-php rrdtool-perl

[root@cacti-server src]# yum -y install gd gd-devel php-gd    #rrdtool繪制圖像需要的圖形庫

 

(6)安裝snmp服務

[root@cacti-server cacti]# yum -y install net-snmp net-snmp-utils php-snmp net-snmp-libs

 

(7)編輯配置文件

[root@cacti-server ~]# vim /etc/snmp/snmpd.conf

41  com2sec notConfigUser  127.0.0.1       public

62  access  notConfigGroup ""   any     noauth    exact  all none none

85  view all    included  .1          80

 

[root@cacti-server ~]# systemctl restart snmpd.service

[root@cacti-server ~]# systemctl enable snmpd.service

 

(8)授權目錄權限

[root@cacti-server ~]# useradd -r -M cacti

[root@cacti-server ~]# chown -R cacti /var/www/html/cacti/rra/

[root@cacti-server ~]# chown -R cacti /var/www/html/cacti/log/

 

(9)配置一個抓圖的計劃任務

[root@cacti-server ~]# crontab -e

*/5 * * * * /usr/bin/php  /var/www/html/cacti/poller.php >> /tmp/cacti_rrdtool.log

 

(10)瀏覽器訪問cacti管理頁面進行安裝

 

(11)測試

[root@cacti-server ~]# /usr/bin/php /var/www/html/cacti/poller.php

OK u:0.00 s:0.01 r:0.80

OK u:0.00 s:0.02 r:1.21

OK u:0.00 s:0.02 r:1.39

OK u:0.00 s:0.02 r:1.50

OK u:0.00 s:0.02 r:1.87

10/21/2016 04:02:32 PM - SYSTEM STATS: Time:1.4211 Method:cmd.php Processes:1 Threads:N/A Hosts:2 HostsPerProcess:2 DataSources:5 RRDsProcessed:5

 

 

3.安裝Spine

 

注:由于cacti默認使用cmd.php來輪詢數據,速度會很慢,特別是在監控節點比較多的情況下,cmd.php就更顯不足了,因此我們采用Spine來輪詢數據。cacti-spine是一個由C語言開發的,用于替代cmd.php的快速獲取數據的引擎。

(1)編譯安裝spine

[root@cacti-server ~]# cd /usr/local/src/

[root@cacti-server src]#wget http://www.cacti.net/downloads/spine/cacti-spine-0.8.8f.tar.gz

[root@cacti-server src]# tar zxvf cacti-spine-0.8.8f.tar.gz

[root@cacti-server cacti-spine-0.8.8f]# ./configure

[root@cacti-server cacti-spine-0.8.8f]# make

[root@cacti-server cacti-spine-0.8.8f]# make install

 

(2)拷貝snmp的配置文件

[root@cacti-server ~]# cp /usr/local/spine/etc/spine.conf.dist /etc/spine.conf

注:spine默認配置文件需要放在/etc才會生效,否則測試時會報如下錯誤:
SPINE: Poller[0] FATAL: Unable to read configuration file! (Spine init)

 

(3)編輯配置文件

[root@cacti-server ~]# vim /etc/spine.conf

DB_Host         localhost

DB_Database     cacti

DB_User         cacti

DB_Pass         redhat

DB_Port         3306

 

(4)測試

[root@cacti-server ~]# /usr/local/spine/bin/spine

SPINE: Using spine config file [/etc/spine.conf]

SPINE: Version 0.8.8f starting

SPINE: Time: 0.1278 s, Threads: 5, Hosts: 2

 

(5)修改web的設置

進入Cacti頁面設置spine路徑

Console -> Configuration -> Settings -> Paths -> Alternate Poller Path -> Spine Poller File Path->/usr/local/spine/bin/spine

 

(6)修改Cacti使用的Poller Type
Console -> Configuration -> Settings ->Poller->Poller Type->spine

 

(7)查看日志

[root@cacti-server ~]# cat /var/www/html/cacti/log/cacti.log

10/22/2016 12:45:50 AM - SYSTEM STATS: Time:0.1146Method:spine Processes:1 Threads:1 Hosts:2 HostsPerProcess:2 DataSources:0 RRDsProcessed:0

 

 

4.添加被監控主機

 

(1)安裝snmp服務

[root@cacti-client ~]# yum -y install net-snmp net-snmp-devel net-snmp-utils

 

(2)編輯配置文件

[root@cacti-client ~]# vim /etc/snmp/snmpd.conf

41  com2sec notConfigUser  192.168.23.156       public

62  access  notConfigGroup ""   any     noauth    exact  all none none

85  view all    included  .1                     80

 

[root@cacti-client ~]# systemctl restart snmpd

[root@cacti-client ~]# systemctl enabled snmpd

 

(3)配置防火墻

[root@cacti-client ~]# firewall-cmd --permanent --add-port=161/udp

success

[root@cacti-client ~]# firewall-cmd --reload

success

 

 

5.監控apache

 

客戶端的配置

 

(1)編輯apache的配置文件,加入server-status模塊的設置

[root@cacti-client ~]# vim /etc/httpd/conf/httpd.conf

ExtendedStatus On

<Location /server-status>

  SetHandler server-status

  Order deny,allow

  Deny from all

  Allow from all

</Location>

[root@cacti-client ~]# systemctl restart httpd

[root@cacti-client ~]# systemctl enable httpd

 

(2)查看apache加載的模塊

[root@cacti-client ~]# apachectl -t -D DUMP_MODULES|grep status

 status_module (shared)

 

(3)訪問http://192.168.23.157/server-status查看模塊的詳細信息

 centos7下搭建cacti

[root@cacti-client ~]# firewall-cmd --permanent --add-service=http

success

[root@cacti-client ~]# firewall-cmd --reload

success

 

服務端的配置

 

(1)安裝監控apache的php頁面

[root@cacti-server ~]# cd /usr/local/src/

[root@cacti-serversrc]#wget http://forums.cacti.net/download/file.php?id=18576&sid=8d429b69af5be45179d928e1303f2077

[root@cacti-server src]# unzip ApacheStats_0.8.2.zip

[root@cacti-server src]# cd ApacheStats_0.8.2/

[root@cacti-serverApacheStats_0.8.2]#cp ss_apache_stats.php /var/www/html/cacti/scripts/

 

(2)導入模板

在Cacti Web界面導入cacti_host_template_webserver_-_apache.xml模板:

點擊Import/Export->Import Templates,上傳模板即可

 

(3)添加服務器并創建圖表

登錄Cacti Web界面,添加被監控apache服務器設備,并創建相應圖表:

Devices->Add->WebServer–Apache模板->Create New Graphs,添加所需圖表即可。等待一段時間就會出圖

 

 

6.監控mariadb

 

(1)創建用于監控主機連接mariadb進行監控的用戶

[root@cacti-client ~]# mysql -uroot -predhat

MariaDB [(none)]> grant process,super,replication client on *.*to 'mysqltest'@'192.168.23.156' identified by 'redhat';  

MariaDB [(none)]> flush privileges;

[root@cacti-client ~]# systemctl restart mariadb

 

(2)配置防火墻

[root@cacti-client ~]# firewall-cmd --permanent --add-port=3306/tcp

success

[root@cacti-client ~]# firewall-cmd --reload

success

 

(3)安裝監控mariadb的php頁面文件

[root@cacti-server ~]# cd /usr/local/src/

[root@cacti-serversrc]#wget https://www.percona.com/downloads/percona-monitoring-plugins/1.1.6/percona-monitoring-plugins-1.1.6.tar.gz

[root@cacti-server src]# tar zxvf percona-monitoring-plugins-1.1.6

[root@cacti-server src]# cd percona-monitoring-plugins-1.1.6/cacti/scripts/

[root@cacti-serverscripts]#cpss_get_mysql_stats.php  /var/www/html/cacti/scripts/

 

(4)編輯頁面文件

[root@cacti-server scripts]# vim /var/www/html/cacti/scripts/ss_get_mysql_stats.php

$mysql_user = 'mysqltest';   #用于監控主機連接mariadb的用戶

$mysql_pass = 'redhat';    #用戶密碼

 

(5)導入模板

在Cacti Web界面導入cacti_host_template_percona_mysql_server_ht_0.8.6i-sver1.1.6.xml模板:

點擊Import/Export->Import Templates,上傳模板即可

 

(6)添加服務器并創建圖表

登錄Cacti Web界面,添加被監控mariabdb服務器設備,并創建相應圖表:

Devices->Add->dbServer–Mysql模板->Create New Graphs,添加所需圖表即可。等待一段時間就會出圖

 

 

7.郵件報警

 

(1)下載插件

[root@cacti-server ~]# cd /usr/local/src/

[root@cacti-server src]# tar zxvf settings-v0.71-1.tgz

[root@cacti-server src]# mv settings /var/www/html/cacti/plugins/

[root@cacti-server src]# tar zxvf thold-v0.5.0.tgz

[root@cacti-server src]# mv thold /var/www/html/cacti/plugins/

 

(2)訪問cacti管理頁面安裝插件

 

 

(3)測試

 

centos7下搭建cacti

centos7下搭建cacti

 

(4)告警被觸發,查看郵件

[root@cacti-server ~]# cat  /var/spool/mail/root

..................................

..................................

To: root@192.168.23.156

Subject: ALERT: test - Used Space - / [hdd_used] [hdd_used] went above threshold of 25 with 36.8871

From: Cacti <Cacti@localhost.localdomain>

Date: Mon, 24 Oct 2016 14:00:03 +0800

..................................

An alert has been issued that requires your attention.

..................................

Host: test (192.168.23.157)

URL: http://192.168.23.156/cacti//graph.php?local_graph_id=103&rra_id=1

Message: ALERT: test - Used Space - / [hdd_used] [hdd_used] went above threshold of 25 with 36.8871

..................................

Content-Type: p_w_picpath/jpg

Content-Disposition: inline; filename="103.jpg"

...................................

...................................

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