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Unplanned downtime may be the result of a software bug, human error, equipment failure, power failure, and much more. Last week was a bad one. We faced three different downtime:

  • First, there was a fiber cut for one of our data center resulting into routing anomalies due BGP reroute. Traffic was rerouted but updating those BGP tables took some time to update.
  • Someone from networking team failed to follow proper maintenance procedures for network device resulted into 55 minutes downtime.
  • One of our SAN hardware failure – Many internal UNIX / Linux web applications use SAN to store data including file server, tracking apps, R&D apps, IT help desk, LAN and WAN servers failed. This one lasted for 12 hrs. It was stared around midnight. The vendor replaced entire SAN hardware. Now we have dual stacked SAN as a backup device for internal usage.

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Like most sys admin, I’m lazy. I try to automate almost all things in order to save time. Inexperienced sys admin and help desk staff working under me finds all these tools useful. It saves their time and avoids security issues. Automation allows help desk staff to do things that they don’t have enough direct system knowledge to do themselves. However, selecting correct tool and applying correct methodology is very important.

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A major class of scripting languages has grown out of the automation of job control under Linux and UNIX, which relates to starting and controlling the behavior of system programs.

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Maintenance services that give direct access to servers and devices for administrative purposes. Please vote your common remote maintenance services such as SSH, X Windows, VNC, and Microsoft Terminal Services etc: Note: There is a poll embedded within this post at left sidebar, please visit the site to participate in this post’s poll. The poll […]

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In last months reader poll I asked about Firewall on dedicated UNIX / Linux box. Do we really need a firewall? Personally, I install firewall on all boxes to filter out unwanted junk and IPs; even if box is only running public service such as a web server. The overall idea is to limit access […]

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Our last poll asked readers of this blog the question: How do you keep remote users out in emergency? Thanks to everyone, total 789 people responded to the poll. Results are as follows: 47% admin prefer to take down eth0 using ifconfog eth0 down 29% admin prefer to deny access to all using iptables 14% […]

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Our last poll asked readers of this blog the question: Which Webserver do you use? Thanks to everyone, total 435 people responded to the poll. Results are as follows: 66% users are using Apache v2.2.x web server 11% uses are using Apache v1.3x web server 8% users are using Microsoft IIS v5/6 web server 6% […]

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