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Apr. 14th, 2011

Sac

Samba4 All hopes dead.

Been waiting for Samba4 stable for long. It seems the wait is not worth and the development is snail slow. The scheduled alpha15 is still not here. Time to go with ADS.

Originally published at Sachin Gopalkrishnan. Please leave any comments there.

Feb. 22nd, 2011

Sac

DDWRT!

Just logged in to my ddwrt and a “PS” from root shows the wireless router password in plain “nas -P /tmp/nas.wl0lan.pid -H 34954 -l br0 -i eth2 -A -m 4 -k mypassword -s Sector7 -w 2 -g 3600″. This is ugly.

Originally published at Sachin Gopalkrishnan. Please leave any comments there.

Dec. 9th, 2010

Sac

Windows Debugger.

While trying to debug a windows issue using windbg, I came across debuging sysmbols
not getting loaded and got an error “module load completed but sysmbols cannot be
completed”

The easiest fix is:
1. Start the WinDBG
2. Select File >, “Symbol File Path…”
c) Set the path

SRV*C:\sysmbols*http://msdl.microsoft.com/download/symbols

Here you need to create a folder caled sysmbols before adding this. And you should be done. Now you can debug the dmp files using windows.

Update: I found a windows symbols which can be downloaded. Do a google
for “Download Windows Symbol Packages and hopefully you may not have to
do the above. But for me right now it pulls down the symbols as long
as I have internet.

Originally published at Sachin Gopalkrishnan. Please leave any comments there.

Sep. 18th, 2010

Sac

VisionAPP replacement – mRemoteng

Yes, if you manage 100 of server on windows, linux, citrix you know what Visionapp is. I was always looking for a opensource replacement and after so long finally there is one which just works. Go download mRemote here.

UPDATE: Sad, mRemote has merged with vRD. I have no idea how this goes ahead. (Removed Donate text)

Originally published at Sachin Gopalkrishnan. Please leave any comments there.

May. 28th, 2010

Sac

Linux Cache Thrashed

Recently I came across an application in my workplace which is still under test phrase thrashing cache on RedHat linux servers badly. If this application would run for an hour+ the Server would start slowing down and the only way out was restart the linux server.

Then I came across this:

drop_caches

Writing to this will cause the kernel to drop clean caches, dentries and inodes from memory, causing that memory to become free.

To free pagecache:

* echo 1 > /proc/sys/vm/drop_caches

To free dentries and inodes:

* echo 2 > /proc/sys/vm/drop_caches

To free pagecache, dentries and inodes:

* echo 3 > /proc/sys/vm/drop_caches

As this is a non-destructive operation, and dirty objects are not freeable, the user should run “sync” first in order to make sure all cached objects are freed.

This tunable was added in 2.6.16.

Source: Linuxinsight
Source: Cyberciti.biz

Originally published at Sachin Gopalkrishnan. Please leave any comments there.

Apr. 29th, 2010

Sac

Zimbra View mail disable

Do you have several admins who are looking administering Zimbra and you are concerned about all of them having access to viewing mails. Stop! Just issue these commands and keep the Admin password with you and they should be able Administer without “View Mail” options.

Commands to stop view mails from Zimbra, GlobalAdmin has be disabled:

#zmprov ma sachin@xxx.com zimbraIsDelegatedAdminAccount TRUE zimbraAdminConsoleUIComponents
cartBlancheUI

#zmprov grr global usr sachin@xxx.com +adminConsoleRights
#zmprov grr global usr sachin@xxx.com -adminLoginAs

Originally published at Sachin Gopalkrishnan. Please leave any comments there.

Mar. 9th, 2010

Sac

Zine

I am looking at Zine a relatively new weblog engine written on python. I found it easy fast and secure. A move to Zine from Wordpress is next on evaluation.

Originally published at Sachin Gopalkrishnan. Please leave any comments there.

Jan. 16th, 2010

Sac

Is chkrootkit the best ?

Mostly when I suspect that there is rootkit presence on Linux, the first I would go for is I am sure mostly all admins prefer the same or rkhunter. Yesterday just of curiosity when I checked the chkrrootkit script I saw that it would check for the default locations where the rootkit infects. If a dedicated hacker completely re-engineers the code, I don’t think it would throw out a error. I believe that the speed with which it scans out results is also because of it. I may be wrong as i have not read the complete script but rare.
Dgg it!

Originally published at Sachin Gopalkrishnan. Please leave any comments there.

Feb. 6th, 2009

Sac

Which OS?

I am with ubuntu 8.10 now. Left windows years back. Now what ? We build our own comfort levels everywhere: People, Places, Products… and Choosing a OS and sticking on is same. Time to change but what? MacOS, Freebsd..or  OpenBSD. They all are Unix based and I am good on that. I guess i have none to move on, to make myself uncomfortable, to Challenge.

Originally published at Sachin Gopalkrishnan. Please leave any comments there.

Oct. 19th, 2008

Sac

Linus Torvaldo.

Linus has a blog.
Update: And so does my wife. :)

Originally published at Sachin Gopalkrishnan. Please leave any comments there.

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