Today I was searching for a nagios check which gets memory information over snmp. So I came across check_netsnmp_memory. It has also a nice php template for pnp4nagios.<\/p>\n
To test the command I run:<\/p>\n
# .\/check_netsnmp_memory -L “Memory Utilization” -A ‘*’ -H graylog2.domb.net -C public -a ‘total,user,cached,buffer,%used_real,%used_swap,%user_real,%cached_real’ -w ‘,,,500MB,,65%,65%,’\u00a0 -c ‘,,,800MB,,80%,80%,’<\/p>\n
As a result I got this:<\/p>\n
ERROR: snmp get_request failed – Received noSuchName(2) error-status at error-index 7.<\/strong><\/p>\n Seems that one of the snmp checks does not get a value back. So i looked at the check_netsnmp_memory script.<\/p>\n On line \u00a056\u00a0 you’ll find\u00a0 “shared=snmp(1.3.6.1.4.1.2021.4.13.0),1000,\/,round(1),’ MB’,+”,<\/p>\n This queries the following value UCD-SNMP-MIB::memShared.0.<\/p>\n Aha \ud83d\ude42 memShared<\/strong><\/em>.<\/p>\n As far as I now “memShared” is no longer valid in Linux >= 2.6 kernel and was dropped from line 56:<\/p>\n – <\/span>“shared=snmp(1.3.6.1.4.1.2021.4.13.0),1000,\/,round(1),’ MB’,+”, line 65:<\/p>\n – <\/span> “user=total_real,avail_real,-,total_swap,+,avail_swap,-,buffer,-,shared<\/strong><\/em>,-,cached,-,’ MB’,+”, Now run the command again:<\/p>\n # .\/check_netsnmp_memory -L “Memory Utilization” -A ‘*’ -H graylog2.domb.net -C public -a ‘total,user,cached,buffer,%used_real,%used_swap,%user_real,%cached_real’ -w ‘,,,500MB,,65%,65%,’\u00a0 -c ‘,,,800MB,,80%,80%,’<\/p>\n Memory Utilization OK – total is 24846.1 MB [16457.5 MB real 8388.6 MB swap : 8734.0 MB free], user is 7149 MB, cached is 8803.8 MB, buffer is 159.3 MB, %used_real is 97.76%, %used_swap is 0.27%, %user_real is 43.44%, %cached_real is 53.49% | total_free=8734.0 %avail_real=2.24 %avail_swap=99.73 %buffer_real=0.97 user=7149 %user_real=43.44 avail_swap=8365.7 %used_real=97.76 used_swap=22.9 total=24846.1 %cached_real=53.49 cached=8803.8 total_swap=8388.6 buffer=159.3 min_swap=16.0 avail_real=368.3 total_real=16457.5 %used_swap=0.27<\/p>\n <\/p>\n <\/p>\n","protected":false},"excerpt":{"rendered":" Today I was searching for a nagios check which gets memory information over snmp. So I came across check_netsnmp_memory. It has also a nice php template for pnp4nagios. To test the command I run: # .\/check_netsnmp_memory -L “Memory Utilization” -A ‘*’ -H graylog2.domb.net -C public -a ‘total,user,cached,buffer,%used_real,%used_swap,%user_real,%cached_real’ -w ‘,,,500MB,,65%,65%,’\u00a0 -c ‘,,,800MB,,80%,80%,’ As a result I…<\/p>\n","protected":false},"author":2,"featured_media":245,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_themeisle_gutenberg_block_has_review":false,"footnotes":""},"categories":[3],"tags":[],"class_list":["post-236","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-linux"],"_links":{"self":[{"href":"https:\/\/blog.domb.net\/index.php?rest_route=\/wp\/v2\/posts\/236","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.domb.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.domb.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.domb.net\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.domb.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=236"}],"version-history":[{"count":7,"href":"https:\/\/blog.domb.net\/index.php?rest_route=\/wp\/v2\/posts\/236\/revisions"}],"predecessor-version":[{"id":247,"href":"https:\/\/blog.domb.net\/index.php?rest_route=\/wp\/v2\/posts\/236\/revisions\/247"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blog.domb.net\/index.php?rest_route=\/wp\/v2\/media\/245"}],"wp:attachment":[{"href":"https:\/\/blog.domb.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=236"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.domb.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=236"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.domb.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=236"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\nnet-snmp. Because we know that this value should be always ‘0’ you can comment\u00a0 line 56 and replace shared with a ‘0’ on line 65.<\/p>\n
\n + <\/span> #<\/strong> “shared=snmp(1.3.6.1.4.1.2021.4.13.0),1000,\/,round(1),’ MB’,+”,<\/p>\n
\n + <\/span> “user=total_real,avail_real,-,total_swap,+,avail_swap,-,buffer,-,0,<\/strong><\/em>-,cached,-,’ MB’,+”,<\/p>\n