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Burning in your new server : How server hardware load testing helps us improve data center infrastructure reliability
The data was conclusive. The servers orion-47, orion-50 and orion-52 needed RAM upgrades. In the past one month their RAM usage has mostly been above 85% and was showing an increasing trend. Swap usage has grown by more than 20% and it was resulting in higher I/O wait...
Safe data recovery : Dos and Dont’s of rebuilding RAID arrays in data centers after a hard disk drive failure
It is unwelcome, it is tedious, but it is inevitable. Every service provider dreads a hard disk crash, and the downtime it can lead to, but it is one eventuality that will happen sooner or later. Today was one such day. A high priority alert notified our Dedicated...
GHOST hunting – Resolving glibc Remote Code Execution vulnerability (CVE-2015-0235) in CentOS, Red Hat, Ubuntu, Debian and SUSE Linux servers
Reports are coming in from our Dedicated Linux Systems Administrators about an evolving threat, disclosed earlier today. A heap buffer overflow vulnerability in GNU C Library (glibc), allows remote or local actors to execute arbitrary code under the privilege of user...
Surviving the blue screen of death – How a Hyper-V Windows VPS fatal error was resolved
"I did nothing. It just crashes all the time!" So began a professional administration request at the help desk of a data center we managed. The customer's unmanaged Windows 2008 R2 VPS started crashing one fine day without any apparent reason. The event logs didn't...
Fault tolerant service logging – How remote logging was made resilient to crashes
"Logs from alpha-p3 is missing!" We were responding to an issue raised by an onsite technician for a data center we managed. System logs from one server was missing in the central log server. It looked like the Rsyslog service that was used for central logging had...
Cornering an SLA killer – How systematic resolution of an OpenVZ crash protected uptime guarantees
It was a peaceful night shift at a data center we managed. Just a few routine server provisioning and customer queries were keeping us occupied. Suddenly all alarm bells started ringing. 25+ managed server instances had gone offline, and the alert priority was among...
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