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Linux systems administrator employed in an open source company.

Available for technical administration, consulting, architecture of infrastructures and technical information here and there.

Specialties

Linux, Memory management, Scheduling, performance management and tuning, linux kernel, filesystem management and tuning -ext*, NFS, LVM, RAID, Linux side administration of NAS and SAN, Netapp Data Ontap 7.2, bash, python, source code analysis, debugging, anything that deals with Linux


Jul
1
awarded  Scholar
Jul
1
revised Identify disks in vCenter to partitions in Linux guest
Answered. Edited to reflect it.
Jul
1
comment Identify disks in vCenter to partitions in Linux guest
Danke good sir. You are doing human kind a great service :) Obviously I knew lsscsi but never thought to apply at that point.
Jul
1
accepted Identify disks in vCenter to partitions in Linux guest
Jul
1
awarded  Student
Jul
1
comment Will a vSphere client 5.1 task get cancelled/interrupted if I close out of the client?
serverfault.com/questions/609330/… Here you go, good sir.
Jul
1
asked Identify disks in vCenter to partitions in Linux guest
Jul
1
comment Will a vSphere client 5.1 task get cancelled/interrupted if I close out of the client?
@ewwhite Hey man, unrelated question. How can I co-relate the hard drives in vcenter -> settings -> hardware tab to the actual partitions on disk. Do you think this warrants a separate question. I am not much good with vmware.
Jun
24
awarded  Revival
Jun
9
awarded  Yearling
May
2
awarded  Nice Answer
Mar
17
comment A botnet may be attacking our site right now, how should we respond?
Howdy,Are the requests coming from the same IP address or same subnet. Can you take the IP and perform a reverse DNS lookup to see from where it is originating. You didn't mention which OS. But whatever you are using, how about blacklisting the range of IP addresses that you suspect are attacking?
Jan
28
comment Where do you store shared secrets used in building VMs dynamically (phoenix servers)?
I had a customer with this issue and I resorted to suggesting secret server. Other thing that I have heard good of is Zoho, but I haven't used it though. Have you looked into some open source tools? Also, I upvoted and starred this since I am interested in this.
Jan
25
comment /etc/init.d/nginx not executable
I am no nginx guy. Few questions, as which user you are running the webserver when you are restarting and can you strace the failed step please. And by that, I mean this, strace -ffttTo /tmp/strace.out <command>
Jan
1
comment How to SSH tunnel to avoid MITM attacks?
Upvote for a fairly articulate question. Next time, you might want to include if you yourself has done any research pertinent to the problem. Just a tip ;)
Jan
1
comment Tools for detecting network traffic filtering
I agree with MikeyB here. If we consider this question as a 'check-before-you-deploy' network testing/capacity-planning for any user or a small business, wouldn't it make sense? Or if someone can recommend a tool then we can reorganize the question to fit to the tool itself. Thoughts?
Dec
30
comment Linux oom situation
Gotcha, Initially I was bit puzzled with the trace. I have read tons of traces like this but what obviously I didn't pay much attention here :p Now, I see it. sk_page_frag_refill() is called when we enter the Normal zone only. When I saw the TSO generation part in the trace, I was inclined to think it of as rather a DMA zone problem. With that, I couldn't match the fragmention/buddy allocator chunks. Yeah, I need to pay more attention :) Thanks buddy.
Dec
30
comment Linux oom situation
Hi Mlfe, excellent answer. I am curious about this part of your post. "The kernel effectively subtracts memory from all lower orders from the total free line and then performs the min watermark check on what is left." - Do you have the relevant source code that I can go through? Because, well, I have dealt a lot of OOM issues but I haven't seen this logic in source. Perhaps, I missed. Where are you seeing anyway? oom_kill.c? Or anything else?
Dec
29
reviewed Approve suggested edit on Should logs for /opt go in /var/opt or /var/log?
Dec
28
reviewed Approve suggested edit on How to kill the process using the name of the program instead of PID?