MRTG - мониторинг сети на сервере


Тестилось и работает на Ubuntu 10.04 и в 12.04. Заранее оговорюсь, у Вас должен быть установлен и настроен LAMP-сервер, далее ставим необходимый нам софт:
sudo apt-get install snmpd mrtg

Правим:

sudo nano /etc/snmp/snmpd.conf

Для 10.04 исправляем такие строки, было:

com2sec paranoid default public
#com2sec readonly default public
#com2sec readwrite default private

Доводим до такого вида:

#com2sec paranoid default public
com2sec readonly default public
#com2sec readwrite default private

Для Ubuntu 12.04 выкладываю полностью конфиг, так как некоторые не понимают, что там к чему:

###############################################################################
#
# EXAMPLE.conf:
# An example configuration file for configuring the Net-SNMP agent ('snmpd')
# See the 'snmpd.conf(5)' man page for details
#
# Some entries are deliberately commented out, and will need to be explicitly activated
#
###############################################################################
#
# AGENT BEHAVIOUR
#

# Listen for connections from the local system only
agentAddress udp:127.0.0.1:161
# Listen for connections on all interfaces (both IPv4 *and* IPv6)
#agentAddress udp:161,udp6:[::1]:161

###############################################################################
#
# SNMPv3 AUTHENTICATION
#
# Note that these particular settings don't actually belong here.
# They should be copied to the file /var/lib/snmp/snmpd.conf
# and the passwords changed, before being uncommented in that file *only*.
# Then restart the agent

# createUser authOnlyUser MD5 "remember to change this password"
# createUser authPrivUser SHA "remember to change this one too" DES
# createUser internalUser MD5 "this is only ever used internally, but still change the password"

# If you also change the usernames (which might be sensible),
# then remember to update the other occurances in this example config file to match.

###############################################################################
#
# ACCESS CONTROL
#

# system + hrSystem groups only
view systemonly included .1.3.6.1.2.1.1
view systemonly included .1.3.6.1.2.1.25.1

# Full access from the local host
#rocommunity public localhost
# Default access to basic system info
rocommunity public

# Full access from an example network
# Adjust this network address to match your local
# settings, change the community string,
# and check the 'agentAddress' setting above
#rocommunity secret 10.0.0.0/16

# Full read-only access for SNMPv3
rouser public
# Full write access for encrypted requests
# Remember to activate the 'createUser' lines above
rwuser public

# It's no longer typically necessary to use the full 'com2sec/group/access' configuration
# r[ou]user and r[ow]community, together with suitable views, should cover most requirements

###############################################################################
#
# SYSTEM INFORMATION
#

# Note that setting these values here, results in the corresponding MIB objects being 'read-only'
# See snmpd.conf(5) for more details
sysLocation Lam Monitoring
sysContact Alex
# Application + End-to-End layers
sysServices 0

#
# Process Monitoring
#
# At least one 'mountd' process
proc mountd
# No more than 4 'ntalkd' processes - 0 is OK
proc ntalkd 4
# At least one 'sendmail' process, but no more than 10
proc sendmail 10 1

# Walk the UCD-SNMP-MIB::prTable to see the resulting output
# Note that this table will be empty if there are no "proc" entries in the snmpd.conf file

#
# Disk Monitoring
#
# 10MBs required on root disk, 5% free on /var, 10% free on all other disks
disk / 10000
disk /var 5%
includeAllDisks 10%

# Walk the UCD-SNMP-MIB::dskTable to see the resulting output
# Note that this table will be empty if there are no "disk" entries in the snmpd.conf file

#
# System Load
#
# Unacceptable 1-, 5-, and 15-minute load averages
load 12 10 5

# Walk the UCD-SNMP-MIB::laTable to see the resulting output
# Note that this table *will* be populated, even without a "load" entry in the snmpd.conf file

###############################################################################
#
# ACTIVE MONITORING
#

# send SNMPv1 traps
trapsink localhost public
# send SNMPv2c traps
#trap2sink localhost public
# send SNMPv2c INFORMs
#informsink localhost public

# Note that you typically only want *one* of these three lines
# Uncommenting two (or all three) will result in multiple copies of each notification.

#
# Event MIB - automatically generate alerts
#
# Remember to activate the 'createUser' lines above
iquerySecName internalUser
rouser internalUser
# generate traps on UCD error conditions
defaultMonitors yes
# generate traps on linkUp/Down
linkUpDownNotifications yes

###############################################################################
#
# EXTENDING THE AGENT
#

#
# Arbitrary extension commands
#
extend test1 /bin/echo Hello, world!
extend-sh test2 echo Hello, world! ; echo Hi there ; exit 35
#extend-sh test3 /bin/sh /tmp/shtest

# Note that this last entry requires the script '/tmp/shtest' to be created first,
# containing the same three shell commands, before the line is uncommented

# Walk the NET-SNMP-EXTEND-MIB tables (nsExtendConfigTable, nsExtendOutput1Table
# and nsExtendOutput2Table) to see the resulting output

# Note that the "extend" directive supercedes the previous "exec" and "sh" directives
# However, walking the UCD-SNMP-MIB::extTable should still returns the same output,
# as well as the fuller results in the above tables.

#
# "Pass-through" MIB extension command
#
#pass .1.3.6.1.4.1.8072.2.255 /bin/sh PREFIX/local/passtest
#pass .1.3.6.1.4.1.8072.2.255 /usr/bin/perl PREFIX/local/passtest.pl

# Note that this requires one of the two 'passtest' scripts to be installed first,
# before the appropriate line is uncommented.
# These scripts can be found in the 'local' directory of the source distribution,
# and are not installed automatically.

# Walk the NET-SNMP-PASS-MIB::netSnmpPassExamples subtree to see the resulting output

#
# AgentX Sub-agents
#
# Run as an AgentX master agent
master agentx
# Listen for network connections (from localhost)
# rather than the default named socket /var/agentx/master
#agentXSocket tcp:localhost:705

Теперь перезапускаем snmpd:

sudo /etc/init.d/snmpd restart

Создаем директорию

sudo mkdir /var/www/mrtg

и

sudo mkdir /etc/mrtg

запускаем cfgmaker

cfgmaker --global "workdir: /var/www/mrtg" -ifref=ip --output /etc/mrtg/mrtg.cfg --global 'options[_]: growright,bits' public@localhost

Создаем веб-страницу

indexmaker /etc/mrtg/mrtg.cfg > /var/www/mrtg/index.html

Для того, чтобы апач подхватил все это хозяйство, правим конфиг в /etc/apache2/sites-available/. Так как у меня все работает сайт на php, то дополняем его записью


Alias /mrtg/ "/var/www/mrtg/"
<Directory "/var/www/mrtg/">
Options +Indexes +ExecCGI +FollowSymLinks
DirectoryIndex index.html
AllowOverride Limit
</Directory>

Добавляем в cron:

0,5,10,15,20,25,30,35,40,45,50,55 * * * * root env LANG=C /usr/bin/mrtg /etc/mrtg/mrtg.cfg --logging /var/log/mrtg.log

И перезапускаем snmpd:

sudo /etc/init.d/snmpd restart

Проверяем, набрав в браузере http://sitename/mrtg/ все должно работать!

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