http://www.3open.org/d/ 2012-02-06T05:50:05+08:00 http://www.3open.org/d/ http://www.3open.org/d/lib/tpl/dokubook/images/favicon.ico text/html 2012-02-02T16:51:33+08:00 admin http://www.3open.org/d/tips/how_to_download_the_certificate_of_a_smtp_server?rev=1328172693&do=diff Run: openssl s_client -starttls smtp -crlf -connect mail.example.com:25 Sample output: text/html 2012-02-02T16:41:49+08:00 admin http://www.3open.org/d/tips/linux_administration_tips?rev=1328172109&do=diff * Backup directory structure only using tar * Setup ACL for folders * Amavisd-new basic setup * Setup email disclaimer with altermime and amavisd-new * Setup repository for CentOS updates * Setup TLS PKI and stuff * Using Debian Live * Using OpenVZ * Using apt-cache-ng to speed up APT packages download * RHEL 6 Beta * Setup STGT iSCSI target * Setup iSCSI Initiator * GRUB tips * Using udev rules to fix device filename * Setup roundcube mail on CentOS * Enable Unic… text/html 2012-01-05T12:01:51+08:00 admin http://www.3open.org/d/nagios/centreon/monitoring_vmware_vsphere_with_snmp_traps?rev=1325736111&do=diff Use the vicfg-snmp command from Perl SDK: # send traps to centreon.example.com at standard udp port 162 and community public vicfg-snmp --server esxi.example.com --portnumber 443 --username root --password rootpass \ -t centreon.example.com@162/public # start the snmp service: vicfg-snmp --server esxi.example.com --portnumber 443 --username root --password rootpass --enable text/html 2012-01-05T11:25:54+08:00 admin http://www.3open.org/d/nagios/nagios?rev=1325733954&do=diff Nagios is a very robust and versatile network monitoring solution. We can use it to monitor a lot of things, from CPU temperature to stock price, as long as you can write the check script. Installation * Building from source on CentOS 5 * Installing the NDOutils addon * Installing the ndo2fs addon * Installing PNP4Nagios * Installing the NagVis addon text/html 2012-01-04T17:01:19+08:00 admin http://www.3open.org/d/nagios/centreon/monitoring_snmp_traps?rev=1325667679&do=diff Get the trap definition mib Suppose you get a definition file like: TRAP-TEST-MIB DEFINITIONS ::= BEGIN IMPORTS ucdExperimental FROM UCD-SNMP-MIB; demotraps OBJECT IDENTIFIER ::= { ucdExperimental 990 } demo-trap1 TRAP-TYPE STATUS current ENTERPRISE demotraps VARIABLES { interfaceName } DESCRIPTION "Interface Down." --#TYPE "Interface Status Change" --#SUMMARY "Interface %s is down" --#ARGUMENTS {0} …