Category: Linux

SNMP Informant
https://github.com/mrlesmithjr/cacti

UCD DiskIO

Reference: http://colinrrobinson.com/technology/programming/php/ipv6-subnet-calculator/

 

1. download source
2. modify calculator_tools.php, add following function

   function print_csv( $network )
   {
           if (substr_count($network->position, '.') == 1){
           	echo $network->position.',56,';
   	}else{
           	echo $network->position.',64,';
   	}
   
           if ( count($network->subnets) )
                   echo '';
   
           echo hex_to_human($network->ip) . '/' . $network->prefix . "\n";
   
           foreach( $network->subnets as $subnet )
                   $network_array['subnets'][] = print_csv($subnet); 
   }

    

3. add create_csv.php

   <?php
   require_once 'calculator_tools.php';
   require_once 'Network.php';
   
   $address = '2001:b000:0015::';
   $prefix  = '48';
   $levels  = array('256','256');
   
   $ip = human_to_hex( $address );
   $network = new Network($ip, $prefix, $levels);
   print_csv($network);
   
   ?>

    

參考資料:

架構:

Internet <—->OA Proxy <—->private proxy <———> windows VM (待補圖形架構圖)

環境:

CentOS 6.4 x86_64 with squid 3.1

squid設定:

#
# INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS
#

acl ms_1 dstdomain activation.sls.microsoft.com
http_access allow ms_1
acl ms_2 dstdomain urs.microsoft.com
http_access allow ms_2
acl ms_3 url_regex -i ^http://go.microsoft.com/fwlink
http_access allow ms_3

#CentOS update mirror site
acl centos_mirror dstdomain mirror01.xxx.yyy.net
http_access allow centos_mirror

cache_peer 10.22.33.44 parent 8080 0 no-query no-digest originserver name=oaproxy login=PASSTHRU
cache_peer_access oaproxy allow ms_1
cache_peer_access oaproxy allow ms_2
cache_peer_access oaproxy allow ms_3
cache_peer_access oaproxy allow centos_mirror
cache_peer_access oaproxy deny all

visible_hostname squid

logformat squid %ts.%03tu %6tr %>a %Ss/%03>Hs %<st %rm %ru %un %Sh/%<A %mt
logformat squidmime %ts.%03tu %6tr %>a %Ss/%03>Hs %<st %rm %ru %un %Sh/%<A %mt [%>h] [%<h]
logformat common %>a %ui %un [%tl] "%rm %ru HTTP/%rv" %>Hs %<st %Ss:%Sh
logformat combined %>a %ui %un [%tl] "%rm %ru HTTP/%rv" %>Hs %<st "%{Referer}>h" "%{User-Agent}>h" %Ss:%Sh
access_log /var/log/squid/access.log combined

nonhierarchical_direct off

 

環境:

CentOS 6.4 x86_64版本+EPEL repo

(必須是要全新安裝cacti才適用，舊的5mins資料無法直接升級到1min)

 

安裝cacti bin rpm

yum -y install cacti

 

使用下列指令建立及載入預設資料庫

mysqladmin -u root -p create cacti
mysql -u root -p cacti < /usr/share/doc/cacti-0.8.8b/cacti.sql

 

要在cacti資料庫執行下列作業

# ##待驗證##
# 參考:https://www.tolaris.com/2013/07/09/cacti-and-1-minute-polling/

TRUNCATE TABLE rra;
INSERT INTO `rra` (`id`, `hash`, `name`, `x_files_factor`, `steps`, `rows`, `timespan`) VALUES
(1, 'c21df5178e5c955013591239eb0afd46', 'Daily (5 Minute Average)', 0.5, 5, 25920, 86400),
(2, '0d9c0af8b8acdc7807943937b3208e29', 'Weekly (30 Minute Average)', 0.5, 30, 9000, 604800),
(3, '6fc2d038fb42950138b0ce3e9874cc60', 'Monthly (2 Hour Average)', 0.5, 120, 2250, 2592000),
(4, 'e36f3adb9f152adfa5dc50fd2b23337e', 'Yearly (1 Day Average)', 0.5, 1440, 797, 33053184),
(5, '283ea2bf1634d92ce081ec82a634f513', 'Hourly (1 Minute Average)', 0.5, 1, 10080, 14400);

DELETE FROM `data_template_data_rra` WHERE `rra_id`=5;
INSERT INTO `data_template_data_rra` SELECT DISTINCT `data_template_data_id`,5 FROM `data_template_data_rra`;

UPDATE `data_template_rrd` SET rrd_heartbeat =120;
UPDATE `data_template_data` SET rrd_step =60;

 

修改/etc/cron.d/cacti

*/1 * * * *    cacti   /usr/bin/php /usr/share/cacti/poller.php > /dev/null 2>&1

 

改為1mins後會增加系統負載，建議改用spine方式更新snmp

http://www.cacti.net/downloads/spine/

 

環境：

CentOS 6.4 x86_64 + EPEL repo

cacti 0.8.8.b-1 (from EPEL)

snmp_informant cacti template (https://github.com/mrlesmithjr/cacti/)

 

問題說明：

cacti中使用縮圖方式無法顯示與snmp_informant template相關的圖檔

 

解決方式：

參考資料 (手動patch或是直接用yum升級cacti到0.8.8.b-3即可)

yum -y update cacti

 

 

#!/bin/bash

#install net-snmp rpm
yum -y install net-snmp net-snmp-utils

#backup snmpd.conf
mv /etc/snmp/snmpd.conf /etc/snmp/snmpd.conf.orig

#create snmpd.conf
echo "rocommunity public" > /etc/snmp/snmpd.conf

#disable snmpd access log
echo -en "# snmpd command line options\nOPTIONS=\"-Lf /dev/null -p /var/run/snmpd.pid\"" > /etc/sysconfig/snmpd

#set snmpd start on boot
chkconfig snmpd on

#restart to apply new snmpd.conf 
service snmpd restart

 

參考資料: http://forum.nedi.ch/index.php?topic=1323.0

 

bond0(2000M) = eth0(1000M) + eth1(1000M)

在ifSpeed應該是顯示2000000000(2000M)但是卻是顯示10000000(10M)，造成cacti在繪圖時有10M上限的錯誤限制導致流量大時顯示破圖

[root@storage-sata.idc.local ~]# snmpwalk -c public -v 2c localhost ifSpeed
IF-MIB::ifSpeed.1 = Gauge32: 10000000
IF-MIB::ifSpeed.2 = Gauge32: 4294967295
IF-MIB::ifSpeed.3 = Gauge32: 4294967295
IF-MIB::ifSpeed.4 = Gauge32: 1000000000
IF-MIB::ifSpeed.5 = Gauge32: 100000000
IF-MIB::ifSpeed.6 = Gauge32: 1000000000
IF-MIB::ifSpeed.7 = Gauge32: 1000000000
IF-MIB::ifSpeed.8 = Gauge32: 100000000
IF-MIB::ifSpeed.9 = Gauge32: 100000000
IF-MIB::ifSpeed.10 = Gauge32: 10000000
IF-MIB::ifSpeed.11 = Gauge32: 0
[root@storage-sata.idc.local ~]# snmpwalk -c public -v 2c localhost ifDesc
IF-MIB::ifDescr.1 = STRING: lo
IF-MIB::ifDescr.2 = STRING: eth6
IF-MIB::ifDescr.3 = STRING: eth7
IF-MIB::ifDescr.4 = STRING: eth2
IF-MIB::ifDescr.5 = STRING: eth3
IF-MIB::ifDescr.6 = STRING: eth0
IF-MIB::ifDescr.7 = STRING: eth1
IF-MIB::ifDescr.8 = STRING: eth4
IF-MIB::ifDescr.9 = STRING: eth5
IF-MIB::ifDescr.10 = STRING: bond0
IF-MIB::ifDescr.11 = STRING: br0

 

修正的方式為編輯/etc/snmp/snmpd.conf加入下面這行

interface bond0 6 2000000000

執行service snmpd restart

[root@storage-sata.idc.local ~]# snmpwalk -c public -v 2c localhost ifSpeed
IF-MIB::ifSpeed.1 = Gauge32: 10000000
IF-MIB::ifSpeed.2 = Gauge32: 4294967295
IF-MIB::ifSpeed.3 = Gauge32: 4294967295
IF-MIB::ifSpeed.4 = Gauge32: 1000000000
IF-MIB::ifSpeed.5 = Gauge32: 100000000
IF-MIB::ifSpeed.6 = Gauge32: 1000000000
IF-MIB::ifSpeed.7 = Gauge32: 1000000000
IF-MIB::ifSpeed.8 = Gauge32: 100000000
IF-MIB::ifSpeed.9 = Gauge32: 100000000
IF-MIB::ifSpeed.10 = Gauge32: 2000000000
IF-MIB::ifSpeed.11 = Gauge32: 0

修正後cacti的圖表