Categories: Linux, Sysadmin

Java and Linux

by Karanbir Singh Email

In the overall scheme of things, I wonder if its Java that helped Linux get some level of traction in the large enterprise markets, of if its the other way around : Linux helped Java get into these shops and stay there. Even though I've never been a b… more »

Why do you run CentOS ?

by Karanbir Singh Email

If someone was to ask you why you run CentOS, what would your top 3 reasons be ? - KB more »

Single arch only updates

by Karanbir Singh Email

I've been trying to automate the CentOS-5 updates system as much as possible - however, one thing that the system cant do at this time is be smart about packages that only exist on one arch and not on the others. eg. KVM on x86_64 only. So for the ti… more »

CentOS London Drinks - 29th Sep 2009

by Karanbir Singh Email

A few of us are going to be getting together for drinks on the Tuesday 29th Sep 2009, everyone is welcome to come along. I'll get there for about 18:15hrs and plan on being around till about 20:00 - Depending on how many people are around and what the fe… more »

grub menu from pygrub

by Karanbir Singh Email

If you ever want to get to the grub menu while using pygrub - there is a really simple way of doing that. Just add : bootargs="-i" into the /etc/xen/{domU config file}. And the next time you start the VM, it will bring up the grub menu. Quite han… more »

mdraid and the 200000k speed limit

by Karanbir Singh Email

By default md-raid will limit its operations to 200000k/sec - which is plenty for most desktop and 2 - 3 disk machines, but when you have more than 3 - 4 disks and there is enough cpu and i/o bandwith available, it makes sense to increase that limit.… more »

Speaking at cPanel conference 2009

by Karanbir Singh Email

I will be at the cPanel Conference in the first week of October this year. Hope to meet lots of CentOS Users there! CentOS has a corner in the exhibitor area, and helping out over there will be Garry Dale and maybe Johnny would be able to come down as we… more »

collaborative mind mapping

by Karanbir Singh Email

I've been looking into the idea of collaborative mind mapping. Think wiki, but in a mind map. The aim being to create a knowledge pool around some very specific areas, that multiple people could contribute into. Specially areas where there might be a lot… more »

HP ProLiant Servers and CentOS

by Karanbir Singh Email

This via Hampus : HP seems to now have a support pack, specific to CentOS for their ProLiant servers. Look at : ProLiant Support Pack for CentOS 5 (i386 and x86_64) as an example. That's one form of endorsement! - KB more »

multiple ssh private keys

by Karanbir Singh Email

In quite a few situations its preferred to have ssh keys dedicated for a service or a specific role. Eg. a key to use for home / fun stuff and another one to use for Work things, and another one for Version Control access etc. Creating the keys is simple… more »

CentOS DVD in this months Linux For You

by Karanbir Singh Email

It seems this Months ( August 2009 ) issue of the Linux For You has CentOS-5.3 on the cover mounted DVD. If you are in India, want a copy of CentOS, dont want to pay for downloading 3+ GB over the internet, that might be a good way to get the install… more »

Thunderbird, ram and maturity

by Karanbir Singh Email

Over the last few months, I've started using my proper laptop a lot more, and at work as the exclusive desktop interface and moved the 'Desktop' into a VM host. The only issue being that while the Desktop had 8G of ram, the laptop has 'only' 1G. And my e… more »

yum hitting memory limits

by Karanbir Singh Email

A few minutes back 'KingJ' came into #centos on irc.freenode.net with an odd problem running yum update. His yum process back traces out with : # yum update Loaded plugins: fastestmirror, priorities Loading mirror speeds from cached hostfile Trac… more »

certs for projects.centos.org

by Karanbir Singh Email

Just replaced the certs on projects.centos.org with a verifiable set. So its no longer using self-signed certs. look at https//projects.centos.org/trac/livecd/ as an example!This is in addition to www.centos.org also using the same certs, so it shoul… more »

Open letter to Lance Davis

by Karanbir Singh Email

July 30, 2009 04:39 UTCThis is an Open Letter to Lance Davis from fellow CentOS Developers It is regrettable that we are forced to send this letter but we are left with no other options. For some time now we have been attempting to resolve these prob… more »

spam and training spam

by Karanbir Singh Email

I totally subscribe to the idea of email being a fantastic communication tool, way better than anything the web has put out as yet, and because its async and works with priority tagging its automatically better than any form of synchronous communication.… more »

Connection from UDP log messages

by Karanbir Singh Email

Plenty of people seem to have an issue with snmpd logging connection information for each poll on CentOS 5, like this:Jul 1 09:50:04 doghouse snmpd[4159]: Connection from UDP: [10.0.1.10]:59768Jul 1 09:50:05 doghouse snmpd[4159]: Connection from… more »

Gpg signed spam

by Karanbir Singh Email

I've just had my first ever gpg signed spam email. Yes it is gpg signed, and its signed correctly with a key that seems to not be mentioned anywhere ( or atleast papa google does not know about it ). These guys are still getting better and wiser. Whats n… more »

Thread summaries in thunderbird 3

by Karanbir Singh Email

One new feature I really like in the upcoming Thunderbird 3 tree : thread summaries in the message view pane. Here is an example: Click the image above for a full size view. What makes it even more cool, is that since Thunderbird can already reco… more »

dstat and disk device names

by Karanbir Singh Email

Running dstat normally gives you something like this :# dstat --nocolor----total-cpu-usage---- -dsk/total- -net/total- ---paging-- ---system--usr sys idl wai hiq siq| read writ| recv send| in out | int csw 3 0 97 0 0 0| 820k… more »

Getting yum to show all packages that match

by Karanbir Singh Email

One issue that lots of people run into is when they want a list of all pacakges in the repositories that match their requirements. By default yum will only show you the 'newest' or the 'highest version'. So looking for kernel-devel does this: [root@ch… more »

Checking a machines yum exclude policy

by Karanbir Singh Email

Want a quick and easy way to check what the Excludes policy on a machine is ? Run this :wget -q http://centos.karan.org/check_excludes.py -O - | pythonIt should give you some nice clean output, listing each repository enabled on the machine, a… more »

Removing lots of data from a DB table

by Karanbir Singh Email

If you need to remove large amounts of data from a table ( specially when you need to remove *all* the data in a table), remember its faster to drop the table, and recreate it rather than doing a 'delete from tablename;'.eg: this is against a postgre… more »

say what Arch is this package

by Karanbir Singh Email

# rpm --qf "%{name}.%{arch}\n" -qp hpacucli-8.0-14.noarch.rpm hpacucli.i386 # rpm -qpi hpacucli-8.0-14.noarch.rpm Name : hpacucli Relocations: (not relocatable) Version : 8.0 Vendor: HP… more »

push rather than pull based rsyncs for mirrors

by Karanbir Singh Email

Has anyone given though to doing mirror updates via a 'push' rather than a 'pull' mechanism ? Basically, when new packages are available the machines that get updates would do a rsync to the machines down the order, pushing the updates out. It would… more »

<< 1 2 3 4 5 6 >>