Заголовки

Календарь

Май

M	T	W	T	F	S	S
		1	2	3	4	5
6	7	8	9	10	11	12
13	14	15	16	17	18	19
20	21	22	23	24	25	26
27	28	29	30	31

MRTG

мониторинг

MRTG Setup

Install packages

yum install -y mrtg

Disable in virtual hosts

cd /etc/httpd/conf.d
mv mrtg.conf mrtg.conf.disable

Verify the mrtg clause of apache config

Edit configuration file /etc/mrtg/mrtg.cfg.

Click here to see the example.

# Where should the logfiles, and webpages be created?

HtmlDir: /var/www/mrtg
ImageDir: /var/www/mrtg
LogDir: /var/lib/mrtg
ThreshDir: /var/lib/mrtg
EnableIPv6: no
EnableSNMPv3: yes

# MIBs
LoadMIBs: /usr/share/snmp/mibs/UCD-SNMP-MIB.txt
         ,/usr/share/snmp/mibs/HOST-RESOURCES-MIB.txt

# Common
XSize[_]: 400
YSize[_]: 200

###########################
# WAN interface
##
Title[eth0]: WAN interface
PNGTitle[eth0]: Interface to Internet
MaxBytes[eth0]: 64000
AbsMax[eth0]: 128000
Options[eth0]: growright,bits,noarrow
#SetEnv[eth0]: MRTG_INT_IP="172.16.162.57" MRTG_INT_DESCR="eth0"
Target[eth0]: \eth0:gcpub@localhost:
#Target[eth0]: /172.16.162.57:gcpub@localhost:
PageTop[eth0]: WAN interface
YLegend[eth0]: bits/s
ShortLegend[eth0]: b/s
Legend1[eth0]: Incoming Traffic
Legend2[eth0]: Outgoing Traffic
Legend3[eth0]: Maximum Incoming Traffic
Legend4[eth0]: Maximum Outgoing Traffic
LegendI[eth0]:  In:
LegendO[eth0]:  Out:
WithPeak[eth0]: ymwd

###########################
# VPN interface
##
Title[tun0]: VPN interface
PNGTitle[tun0]: Interface to VPN
MaxBytes[tun0]: 64000
AbsMax[tun0]: 128000
Options[tun0]: growright,bits,noarrow
SetEnv[tun0]: MRTG_INT_IP="10.20.0.1" MRTG_INT_DESCR="tun0"
Target[tun0]: \tun0:gcpub@localhost:
PageTop[tun0]: VPN interface
YLegend[tun0]: bits/s
ShortLegend[tun0]: b/s
Legend1[tun0]: Incoming Traffic
Legend2[tun0]: Outgoing Traffic
Legend3[tun0]: Maximum Incoming Traffic
Legend4[tun0]: Maximum Outgoing Traffic
LegendI[tun0]:  In:
LegendO[tun0]:  Out:
WithPeak[tun0]: ymwd

###########################
# Active CPU, % 
##
Target[acpcpu]: ssCpuRawUser.0&ssCpuRawUser.0:gcpub@localhost
              + ssCpuRawSystem.0&ssCpuRawSystem.0:gcpub@localhost
              + ssCpuRawNice.0&ssCpuRawNice.0:gcpub@localhost
RouterUptime[acpcpu]: gcpub@localhost
MaxBytes[acpcpu]: 100
Options[acpcpu]: nopercent,growright,gauge,noarrow
Unscaled[acpcpu]: ymwd
Title[acpcpu]: CPU Load
PageTop[acpcpu]: Active CPU Load %
ShortLegend[acpcpu]: %
YLegend[acpcpu]: CPU Utilization
Legend1[acpcpu]: Active CPU in % (Load)
Legend2[acpcpu]:
Legend3[acpcpu]:
Legend4[acpcpu]:
LegendI[acpcpu]: Active
LegendO[acpcpu]:
Colours[acpcpu]: DKBLUE#DFC061,DKBLUE#0000DD,DARKGREEN#006600,VIOLET#FF00FF

###########################
# Idle CPU, % 
##
Target[idcpu]: ssCpuIdle.0&ssCpuIdle.0:gcpub@localhost
RouterUptime[idcpu]: gcpub@127.0.0.1
MaxBytes[idcpu]: 100
Options[idcpu]: nopercent,growright,gauge,noarrow
Unscaled[idcpu]: ymwd
Title[idcpu]: CPU Idle
PageTop[idcpu]: Idle CPU %
ShortLegend[idcpu]: %
YLegend[idcpu]: CPU Idle
Legend1[idcpu]: CPU Idle in %
Legend2[idcpu]:
Legend3[idcpu]:
Legend4[idcpu]:
LegendI[idcpu]: Idle
LegendO[idcpu]:
Colours[idcpu]: DKBLUE#DFC061,DKBLUE#0000DD,DARKGREEN#006600,VIOLET#FF00FF

###########################
# Available Memory, bytes
##
Target[avmemby]: memAvailReal.0&memAvailReal.0:gcpub@localhost
PageTop[avmemby]: Free Memory, bytes
Options[avmemby]: nopercent,growright,gauge,noinfo,noarrow
Title[avmemby]: Free Memory
MaxBytes[avmemby]: 2000000
#kMG[avmemby]: k,M,G,T,P,X
ShortLegend[avmemby]: bytes
YLegend[avmemby]: bytes
LegendI[avmemby]: Free Memory:
LegendO[avmemby]:
Legend1[avmemby]: Free memory, not including swap, in bytes
Colours[avmemby]: DKBLUE#61A0DF,DKBLUE#0000DD,DARKGREEN#006600,VIOLET#FF00FF

###########################
# Available Memory, %
##
Target[avmempr]: memAvailReal.0&memAvailReal.0:gcpub@localhost
                 / memTotalReal.0&memTotalReal.0:gcpub@localhost * 100
MaxBytes[avmempr]: 100
Options[avmempr]: nopercent,growright,gauge,noarrow
Unscaled[avmempr]: ymwd
Title[avmempr]: Free Memory
PageTop[avmempr]: Free Memory, %
ShortLegend[avmempr]: %
YLegend[avmempr]: Free Memory %
LegendI[avmempr]: Free Memory:
LegendO[avmempr]:
Legend1[avmempr]: Free memory, not including swap, in %
Colours[avmempr]: DKBLUE#61A0DF,DKBLUE#0000DD,DARKGREEN#006600,VIOLET#FF00FF

###########################
# Disk '/' Usage
##
Target[rootdup]: hrStorageUsed.4&hrStorageUsed.4:gcpub@localhost
                 / hrStorageSize.4&hrStorageSize.4:gcpub@localhost * 100
MaxBytes[rootdup]: 100
Options[rootdup]: nopercent,growright,gauge,noarrow
Unscaled[rootdup]: ymwd
Title[rootdup]: Disk '/' Usage
PageTop[rootdup]: Disk '/' Usage, %
ShortLegend[rootdup]: %
YLegend[rootdup]: %
LegendI[rootdup]: Usage:
LegendO[rootdup]:
Legend1[rootdup]: Root disk usage, in %
Colours[rootdup]: DKBLUE#FFE3A8,DKBLUE#0000DD,DARKGREEN#006600,VIOLET#FF00FF

Target[rootdfb]: hrStorageSize.4&hrStorageSize.4:gcpub@localhost
                 - hrStorageUsed.4&hrStorageUsed.4:gcpub@localhost
PageTop[rootdfb]: Disk '/' Free Space, in bytes
Options[rootdfb]: gauge,nopercent,growright,noarrow,noinfo
#kMG[rootdfb]: k,M,G,T,P,X
Title[rootdfb]: Disk '/' Free Space
MaxBytes[rootdfb]: 4000000000
ShortLegend[rootdfb]: bytes
YLegend[rootdfb]: bytes
LegendI[rootdfb]: Free space:
LegendO[rootdfb]:
Legend1[rootdfb]: '/' free bytes
Colours[rootdfb]: DKBLUE#FFE3A8,DKBLUE#0000DD,DARKGREEN#006600,VIOLET#FF00FF

###########################
# Disk '/home' Usage
##
Target[homedup]: hrStorageUsed.7&hrStorageUsed.7:gcpub@localhost
                 / hrStorageSize.7&hrStorageSize.7:gcpub@localhost * 100
MaxBytes[homedup]: 100
Options[homedup]: nopercent,growright,gauge,noarrow
Unscaled[homedup]: ymwd
Title[homedup]: Disk '/home' Usage
PageTop[homedup]: Disk '/home' Usage, %
ShortLegend[homedup]: %
YLegend[homedup]: %
LegendI[homedup]: Usage:
LegendO[homedup]:
Legend1[homedup]: /home usage, in %
Colours[homedup]: DKBLUE#FFDCB8,DKBLUE#0000DD,DARKGREEN#006600,VIOLET#FF00FF

Target[homedfb]: hrStorageSize.7&hrStorageSize.7:gcpub@localhost
                 - hrStorageUsed.7&hrStorageUsed.7:gcpub@localhost
PageTop[homedfb]: Disk '/home' Free Space, in bytes
Options[homedfb]: gauge,nopercent,growright,noarrow,noinfo
#kMG[homedfb]: k,M,G,T,P,X
Title[homedfb]: Disk '/' Free Space
MaxBytes[homedfb]: 4000000000
ShortLegend[homedfb]: bytes
YLegend[homedfb]: bytes
LegendI[homedfb]: Free space:
LegendO[homedfb]:
Legend1[homedfb]: '/home' free bytes
Colours[homedfb]: DKBLUE#FFDCB8,DKBLUE#0000DD,DARKGREEN#006600,VIOLET#FF00FF

###########################
# Disk '/var' Usage
##
Target[vardup]: hrStorageUsed.8&hrStorageUsed.8:gcpub@localhost
                / hrStorageSize.8&hrStorageSize.8:gcpub@localhost * 100
MaxBytes[vardup]: 100
Options[vardup]: nopercent,growright,gauge,noarrow
Unscaled[vardup]: ymwd
Title[vardup]: Disk '/var' Usage
PageTop[vardup]: Disk '/var' Usage, %
ShortLegend[vardup]: %
YLegend[vardup]: %
LegendI[vardup]: Usage:
LegendO[vardup]:
Legend1[vardup]: /var usage, in %
Colours[vardup]: DKBLUE#CBEB91,DKBLUE#0000DD,DARKGREEN#006600,VIOLET#FF00FF

Target[varfdb]: hrStorageSize.8&hrStorageSize.8:gcpub@localhost
                - hrStorageUsed.8&hrStorageUsed.8:gcpub@localhost
PageTop[varfdb]: Disk '/var' Free Space, in bytes
Options[varfdb]: gauge,nopercent,growright,noarrow,noinfo
#kMG[varfdb]: k,M,G,T,P,X
Title[varfdb]: Disk '/var' Free Space
MaxBytes[varfdb]: 4000000000
ShortLegend[varfdb]: bytes
YLegend[varfdb]: bytes
LegendI[varfdb]: Free space:
LegendO[varfdb]:
Legend1[varfdb]: '/var' free bytes
Colours[varfdb]: DKBLUE#CBEB91,DKBLUE#0000DD,DARKGREEN#006600,VIOLET#FF00FF

###########################
# NTP Clock Offset
##
Target[ntpoff]: `/etc/localsite/mrtg/ntpstat.pl`
Options[ntpoff]: gauge,growright,nopercent,noarrow
Title[ntpoff]: NTP Clock Offset, usecs
MaxBytes[ntpoff]: 20480000
PageTop[ntpoff]: NTP Clock Offset
LegendO[ntpoff]: Negative Drift
LegendI[ntpoff]: Positive Drift
Legend2[ntpoff]: Negative Drift
Legend1[ntpoff]: Positive Drift
YLegend[ntpoff]: drift usecs
ShortLegend[ntpoff]:  usecs
Colours[ntpoff]: DKBLUE#61A0DF,DKBLUE#0000DD,DARKGREEN#006600,VIOLET#FF00FF

Restore long "Target" and "LocaMIBs" lines which are splitted in the example. Replace "< h1>" by "<h1>" (blanks were inserted deliberately to shut up wiki complaints).

Adjust storage and interface indexes. verify them using this query

snmpwalk -v2c localhost -c gcpub hrStorageDesc

Verify correctness of the file:

env LANG=C mrtg /etc/mrtg/mrtg.cfg --check

Create index page

env LANG=C indexmaker /etc/mrtg/mrtg.cfg > /var/www/mrtg/index.html

Warm-up mrtg (when run for the first 2-3 times, it displays errors) and make initial graphs by running mrtg a few times:

env LANG=C mrtg /etc/mrtg/mrtg.cfg
env LANG=C mrtg /etc/mrtg/mrtg.cfg
env LANG=C mrtg /etc/mrtg/mrtg.cfg

Fix /etc/cron.d/mrtg:

*/5 * * * * root /bin/env LANG=C /usr/bin/mrtg /etc/mrtg/mrtg.cfg
             --lock-file /var/lock/mrtg/mrtg_l
             --confcache-file /var/lib/mrtg/mrtg.ok

MRTG Extensions

MRTG Polling script for NTP

I developed ntpstat.pl to show current NTP deltas.

mrtg-ntpstat.pl

#!/usr/bin/perl
my @v = split /,/, `/usr/sbin/ntpq -c rv 2>/dev/null`;
my %var;
for my $i (0 .. $#v) {
  $var{$1} = $2 if $v[$i] =~ /(\S+)=(\S+)/;
  ($var{$1} = $v[$i+1]) =~ s/^\s+// if $v[$i] =~ /(reftime|clock)=/;
}
#for (sort keys %var) { print "$_=$var{$_}\n" }
my $usoff = int($var{offset} * 1000.0);
print $usoff > 0 ? "$usoff\n0\n" : "0\n".(-$usoff)."\n";
print "$var{reftime}\n$var{system}\n";

MRTG Bugs

SNMPv3 bug

mrtg-2.14-5 distributed with CentOS 5 contains a bug. It uses one of two Perl SNMP interfaces via the mrtg.pm module: Net::SNMP or plain SNMP.The module tries to use Net::SNMP if it is available and initializes it. Later mrtg checks EnableSNMPv3 config parameter, and if it is "no", it additionally loads plain SNMP. Thus, initialization is ignored, including list of MIBs to be loaded.As as result, symbolic MIB names are ignored. As a workaround, always set EnableSNMPv3: yes

Duplicate IP address detected

SNMPd daemon prints on startup

Duplicate IP address detected, some interfaces may not be visible in IP-MIB

I performed SNMP walk to see which interfaces it publishes

$ snmpwalk -v2c localhost -c vnpub .1.3.6.1.2.1.2.2.1.2
IF-MIB::ifDescr.1 = STRING: lo
IF-MIB::ifDescr.3 = STRING: venet0
IF-MIB::ifDescr.7 = STRING: tun0

And checked indexes assigned to IP addresses

$ snmpwalk -v2c localhost -c vnpub .1.3.6.1.2.1.4.20.1 | grep EntAddr
IP-MIB::ipAdEntAddr.10.30.0.1 = IpAddress: 10.30.0.1
IP-MIB::ipAdEntAddr.127.0.0.1 = IpAddress: 127.0.0.1
IP-MIB::ipAdEntAddr.4.2.5.6 = IpAddress: 4.2.5.6

Then compared with the ifconfig output

$ ifconfig -a | grep Link
lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
tun0      Link encap:UNSPEC  HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  
          inet addr:10.30.0.1  P-t-P:10.30.0.2  Mask:255.255.255.255
venet0    Link encap:UNSPEC  HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  
          inet addr:127.0.0.1  P-t-P:127.0.0.1  Bcast:0.0.0.0  Mask:255.255.255.255
venet0:0  Link encap:UNSPEC  HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  
          inet addr:4.2.5.6  P-t-P:4.2.5.6  Bcast:4.2.5.6 Mask:255.255.255.255

So actually it was not a SNMP problem but an OpenVZ feature: the venet0 interface was an alias to loopback.

Вложения

soho-mrtg.cfg.txt

soho-mrtg.cfg.txt 7.62 КБ

soho-mrtg-ntpstat.pl.txt

soho-mrtg-ntpstat.pl.txt 403 байта

Bookmark this post on:

Оглавление

Теги