Have you ever come across a server that is doing a lot of traffic? Maybe you have logged in to see a process running at 100% CPU, so you know the culprit, but instead of kill -9ing it, wouldn’t it be great to see what exactly it is up to? Or even if you see [...]
Categories: CentOS,Code Samples,Linux,Shell,System Administration
Tagged: command line, Linux, network, Security, system admin, traffic
I recently came across a typo that existed in a bunch of html files on my web server. I thought it should be easy enough to change, but since it was in a number of files, editing it by hand would be time consuming. Fortunately, there is an easy, one liner command to replace the [...]
Categories: CentOS,Other Code,Shell,System Administration,Ubuntu
Tagged: command line, Linux, tips
Zabbix is an excellent system monitoring package. It does everything from basic availability checking to detailed system resource analysis. It is capable of graphing the variables pulled from the system, and alerting admins if there is a problem or something needed for attention. Once you have the Zabbix server set up, you need to install [...]
Categories: CentOS,Code Samples,Configurations,Linux,Programs,System Administration
Tagged: agent, alerts, monitoring, zabbix
Recently I started seeing this error while provisioning Xen VPSes on a server with 8GB of RAM: [2009-03-23 15:51:40 xend.XendDomainInfo 3310] DEBUG (XendDomainInfo:1603) XendDomainInfo.destroy: domid=None [2009-03-23 15:51:40 xend 3310] ERROR (xmlrpclib2:184) (12, ‘Cannot allocate memory’) I checked the memory, and sure enough, all of the VPSes were using up the memory. More specifically, dom0 (the [...]
Categories: CentOS,Configurations,System Administration,Xen
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