{"id":31,"date":"2003-10-24T15:54:15","date_gmt":"2003-10-24T15:54:15","guid":{"rendered":"https:\/\/143-42-55-146.ip.linodeusercontent.com\/?p=31"},"modified":"2003-10-24T15:54:15","modified_gmt":"2003-10-24T15:54:15","slug":"mrtg-a-snmpd","status":"publish","type":"post","link":"https:\/\/nax.cz\/?p=31","title":{"rendered":"MRTG a SNMPD"},"content":{"rendered":"

Dnes jsem se konecne dostal k tomu, abych rozebehl nejakeho demona ktery mi bude generovat statistiky zatizenosti serveru. Velice rychle jsem nasel projekt Multi Router Traffic Grapher<\/a>, ktery pouziva snmp k zisteni udaju od routeru. Presne to co potrebuju. Dobry bude ze ten demon muze bezet na serveru a tim padem nebudu zatezovat 233MHz routrik tak aby se mohl soustredit jen a jen na routovani.<\/p>\n

Problem ale byl rozbehnout ten snmpd. Pokud vam vypise na dotaz
\n# snmpget 10.27.72.1 public interfaces.ifNumber.0
\nTimeout: No Response from 10.27.72.1.
\ntak to znamena ze bud vam nejede demon nebo mate spatne nastavene tzv community (coz je vlastne jakasy obdoba hesla).<\/p>\n

Po chvilce hrabani se v konfiguraku jsem se dostal do faze
\n# snmpget -v 1 10.27.72.1 public interfaces.ifNumber.0
\nError in packet
\nReason: (noSuchName) There is no such variable name in this MIB.
\nFailed object: interfaces.ifNumber.0<\/p>\n

MIB jsou soubory s definicema jak ziskat urcitou hodnotu. Uz jsem se videl jak se budu hrabat v nejakych drsnych souborech (konkretne v \/usr\/share\/snmp\/mibs\/). Nastesti guru guli mi poslal na mejl jednoduchoucky prikladek. Tady je:<\/p>\n

naxrouter:\/etc\/snmp# cat snmpd.conf
\nECTION: System Information Setup
\n#
\n# This section defines some of the information reported in
\n# the „system“ mib group in the mibII tree.<\/p>\n

# syslocation: The [typically physical] location of the system.
\n# arguments: location_string<\/p>\n

syslocation nax_Modrany<\/p>\n

# sysservices: The proper value for the sysServices object.
\n# arguments: sysservices_number<\/p>\n

sysservices 78<\/p>\n

# syscontact: The contact information for the administrator
\n# arguments: contact_string<\/p>\n

syscontact root@10.27.0.8<\/p>\n

##########################################################################
\n# SECTION: Access Control Setup
\n#
\n# This section defines who is allowed to talk to your running
\n# snmp agent.<\/p>\n

# rouser: a SNMPv3 read-only user
\n# arguments: user [noauth|auth|priv] [restriction_oid]<\/p>\n

rouser public<\/p>\n

# rocommunity: a SNMPv1\/SNMPv2c read-only access community name
\n# arguments: community [default|hostname|network\/bits] [oid]<\/p>\n

rocommunity public 127.0.0.1
\nrocommunity public 10.27.72.1
\nrocommunity public 10.27.72.2<\/p>\n

###########################################################################
\n# SECTION: Monitor Various Aspects of the Running Host
\n#
\n# The following check up on various aspects of a host.<\/p>\n

# proc: Check for processes that should be running.
\n# proc NAME [MAX=0] [MIN=0]
\n#
\n# NAME: the name of the process to check for. It must match
\n# exactly (ie, http will not find httpd processes).
\n# MAX: the maximum number allowed to be running. Defaults to 0.
\n# MIN: the minimum number to be running. Defaults to 0.
\n#
\n# The results are reported in the prTable section of the UCD-SNMP-MIB tree
\n# Special Case: When the min and max numbers are both 0, it assumes
\n# you want a max of infinity and a min of 1.<\/p>\n

proc ssh 10 1
\n#pass .1.3.6.1.4.1.2021.255 \/usr\/local\/libexec\/ipfwsnmp .1.3.6.1.4.1.2021.255<\/p>\n

No a ted uz stacilo jen spravne pustit
\n[naxsite:\/var\/www\/mrtg 15:46:36 Fri Oct 24]
\n# cfgmaker –global ‚WorkDir: \/var\/www\/mrtg‘ –global ‚Options[_]: bits,growright‘ –output=\/var\/www\/mrtg\/mrtg.cfg public@10.27.72.7<\/p>\n

Coz mi vygenerovalo config, ktery jsem jeste kapanek poeditoval a ted uz se muzeme kochat statistikama. Jeste tam musim pridat statistiky ze serveru a zkusim tam pridat treba jeste CPU vytizenost a podobny veci. Velice rychle jsem nasel projekt Multi Router Traffic Grapher<\/a>, ktery pouziva snmp k zisteni udaju od routeru. Presne to co potrebuju. Dobry bude ze ten demon muze bezet na serveru a tim padem nebudu zatezovat 233MHz routrik tak aby se mohl soustredit jen a jen na routovani.<\/p>\n

Problem ale byl rozbehnout ten snmpd. Pokud vam vypise na dotaz
\n# snmpget 10.27.72.1 public interfaces.ifNumber.0
\nTimeout: No Response from 10.27.72.1.
\ntak to znamena ze bud vam nejede demon nebo mate spatne nastavene tzv community (coz je vlastne jakasy obdoba hesla).<\/p>\n

Po chvilce hrabani se v konfiguraku jsem se dostal do faze
\n# snmpget -v 1 10.27.72.1 public interfaces.ifNumber.0
\nError in packet
\nReason: (noSuchName) There is no such variable name in this MIB.
\nFailed object: interfaces.ifNumber.0<\/p>\n

MIB jsou soubory s definicema jak ziskat urcitou hodnotu. Uz jsem se videl jak se budu hrabat v nejakych drsnych souborech (konkretne v \/usr\/share\/snmp\/mibs\/). Nastesti guru guli mi poslal na mejl jednoduchoucky prikladek. Tady je:<\/p>\n

naxrouter:\/etc\/snmp# cat snmpd.conf
\nECTION: System Information Setup
\n#
\n# This section defines some of the information reported in
\n# the „system“ mib group in the mibII tree.<\/p>\n

# syslocation: The [typically physical] location of the system.
\n# arguments: location_string<\/p>\n

syslocation nax_Modrany<\/p>\n

# sysservices: The proper value for the sysServices object.
\n# arguments: sysservices_number<\/p>\n

sysservices 78<\/p>\n

# syscontact: The contact information for the administrator
\n# arguments: contact_string<\/p>\n

syscontact root@10.27.0.8<\/p>\n

##########################################################################
\n# SECTION: Access Control Setup
\n#
\n# This section defines who is allowed to talk to your running
\n# snmp agent.<\/p>\n

# rouser: a SNMPv3 read-only user
\n# arguments: user [noauth|auth|priv] [restriction_oid]<\/p>\n

rouser public<\/p>\n

# rocommunity: a SNMPv1\/SNMPv2c read-only access community name
\n# arguments: community [default|hostname|network\/bits] [oid]<\/p>\n

rocommunity public 127.0.0.1
\nrocommunity public 10.27.72.1
\nrocommunity public 10.27.72.2<\/p>\n

###########################################################################
\n# SECTION: Monitor Various Aspects of the Running Host
\n#
\n# The following check up on various aspects of a host.<\/p>\n

# proc: Check for processes that should be running.
\n# proc NAME [MAX=0] [MIN=0]
\n#
\n# NAME: the name of the process to check for. It must match
\n# exactly (ie, http will not find httpd processes).
\n# MAX: the maximum number allowed to be running. Defaults to 0.
\n# MIN: the minimum number to be running. Defaults to 0.
\n#
\n# The results are reported in the prTable section of the UCD-SNMP-MIB tree
\n# Special Case: When the min and max numbers are both 0, it assumes
\n# you want a max of infinity and a min of 1.<\/p>\n

proc ssh 10 1
\n#pass .1.3.6.1.4.1.2021.255 \/usr\/local\/libexec\/ipfwsnmp .1.3.6.1.4.1.2021.255<\/p>\n

No a ted uz stacilo jen spravne pustit
\n[naxsite:\/var\/www\/mrtg 15:46:36 Fri Oct 24]
\n# cfgmaker –global ‚WorkDir: \/var\/www\/mrtg‘ –global ‚Options[_]: bits,growright‘ –output=\/var\/www\/mrtg\/mrtg.cfg public@10.27.72.7<\/p>\n

Coz mi vygenerovalo config, ktery jsem jeste kapanek poeditoval a ted uz se muzeme kochat statistikama tady<\/a>. Jeste tam musim pridat statistiky ze serveru a zkusim tam pridat treba jeste CPU vytizenost a podobny veci. Zacnu treba tady<\/a>.<\/p>\n

Jeste jsem do \/var\/www\/mrtg\/mrtg.cfg pridal radek
\nRunAsDaemon: Yes
\naby se to startovalo rovnou jako demon a upravil \/etc\/init.d\/skeleton. Trochu problem byl s zabijenim ale vyresil to prikaz
\nkill -9 `ps -ef | awk ‚{print $1″ „$2}‘ | grep $NAME | awk ‚{print $2}’`
\nrespektive
\nkill -9 `cat \/var\/www\/mrtg\/$NAME.pid`<\/p>\n","protected":false},"excerpt":{"rendered":"

Dnes jsem se konecne dostal k tomu, abych rozebehl nejakeho demona ktery mi bude generovat statistiky zatizenosti serveru. Velice rychle jsem nasel projekt Multi Router Traffic Grapher, ktery pouziva snmp k zisteni udaju od routeru. Presne to co potrebuju. Dobry bude ze ten demon muze bezet na serveru a tim padem nebudu zatezovat 233MHz routrik […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-31","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/nax.cz\/index.php?rest_route=\/wp\/v2\/posts\/31","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nax.cz\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nax.cz\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nax.cz\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nax.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=31"}],"version-history":[{"count":0,"href":"https:\/\/nax.cz\/index.php?rest_route=\/wp\/v2\/posts\/31\/revisions"}],"wp:attachment":[{"href":"https:\/\/nax.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=31"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nax.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=31"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nax.cz\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=31"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}