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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...
Shell shock rescue – Tracing a bandwidth spike to outbound DDoS through the infamous Bash vulnerability
"This definitely is a problem with your monitoring system! I never used this bandwidth. I was on holiday!" The accounts department of the data center we managed referred this customer concern to us. His un-managed dedicated server showed a bandwidth spike of 20 times...
Reliable, scalable DNS – How DNS clustering and Centralized name servers resulted in fast, scalable and fault tolerant DNS service
The mood was upbeat. It was our weekly business review with a web host we support. Server improvements had resulted in zero service downtimes, and zero customer complaints on service reliability. It was time to figure out how to improve the infrastructure even...
No more “Sorry no backups” – Restore backups from any day using open source and cPanel backup utilities
"It makes no sense!", so started a tech support chat one Tuesday morning. An e-commerce site had seen a sudden drop in online orders, and the reason was traced to Google branding it as a malware source. The web site looked perfectly normal, and the webmaster was...
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