Linuxers November 2004

linuxers@mm.ilug-bom.org.in

96 participants
163 discussions

Making Compressed CDROM in GNU/Linux
by Nikhil Joshi 07 Nov '04

07 Nov '04

Hi! Wrote this small howto for making compressed CD's in Linux. New users will certainly appreciate the fact Linux provides much more features than just security,stability and speed as compared to other popular OS'es. Making Compressed CDROM in Linux Nikhil Joshi Introduction I had often wondered whether there is a way to zip your files, burn them on a CD and then decompress them on-the-fly to save space. Well the good news is there is a method to do the same! Linux provides a Transparent decompression extension to achieve the same. It is useful when you have a lot of text/HTML/ doc files to burn on the CD and you want to save the precious space. It is especially useful to view the e-books which are mostly in HTML format. Prepare the Kernel CAVEAT: Please note that the CD that we are going to make will only be readable in Linux environment as Windows does not have the Transparent decompression extension. First we have to enable the Transparent decompression extension in the kernel. Compiling the kernel is a tricky business and requires patience and will to learn something new. This link will certainly help you: http://www.digitalhermit.com/linux/Kernel-Build-HOWTO.html I'll outline the steps below: 1. Download and unpack the latest 2.6 series stable kernel from http:// www.kernel.org/ 2. Type make menuconfig 3. Goto File Systems -> CDROM/DVD Filesystems and enable Transparent decompression extension 4. make; make modules; make modules_install 5. Copy the bzImage to /boot and update the bootloader configuration appropriately The commands Now that we have the kernel ready let's see the commands. Put everything you want to compress in a directory. First we make a compressed directory hierarchy of the directory we want to compress. $ mkzftree intree outree creates a compressed directory (outree) out of a normal directory (intree). Now we will make an iso image out of the directory hierarchy. $ mkisofs -o mycd.iso -R -allow-lowercase -allow-multidot -l -L - z outree That's it!! We have created an iso file which we can burn using any CD Burning Software. I use k3b (http://www.k3b.org/) on Linux. Conclusion I created a normal iso image out of a directory tree and another iso image out of the compressed directory tree. The space savings were obvious: 591MB for normal iso and 448MB using compression. A gain of 143 MB. This directory tree had lots of PDF files which do not compress well as compared to ASCII text files. Overall the space saving was considerable and I am already a fan of Transparent decompression. -- Often it takes some calamity to make us live in the present. Then suddenly we wake up and see all the mistakes we have made. But it is too late to change anything. -- Calvin

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GNUChess
by komal 06 Nov '04

06 Nov '04

Which toolkit and programming framework GNUChess used? It is really very annoying to keep hold on menu to go to the options. Frankly it sucks Regards Komal

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Re: Re: [ILUG-BOM] Sendmail Filtering
by Mangesh V Rakhunde 06 Nov '04

06 Nov '04

Hi my question was i run sendmail server configured with smtp-= auth. Is there any way where i can filter the mails or discard the mails ha ving infected attachments. On Sat, 06 Nov 2004 Devdas B= hagat wrote : >On 06/11/04 08:23 -0000, Mangesh V Rakhunde wrote:<= BR> > > I run a mail server i.e sendmail o configured = SMTP auth. > > > > > > > >&= nbsp; My problem is mails. Many machines in and t= hey just send infected mail server itself. > >Plea= se send in plain text, wrapping the lines at 76 characters, or less. = > > >From what I can understand, you have PCs infected by vi= ruses which are >directly sending mail out, and getting your exter= nal IP blacklisted. > >The correct solution to this is to= implement a packet filter which >blocks port 25 outbound, and ens= ures that outbound connections come only > from your real outbound= MTA. > >The logs from this packet filtering firewall wil= l also tell you which >systems are infected by viruses. > >Devdas Bhagat > >-- >http://mm.ilug-b= om.org.in/mailman/listinfo/linuxers [1] [] References 1. 3D"http://clients.rediff.com/signature/track_sig.asp"

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Re: Re: [ILUG-BOM] Sendmail Filtering
by Mangesh V Rakhunde 06 Nov '04

06 Nov '04

Hi my question was i run sendmail server configured with = smtp-auth. Is there any way where i can filter the mails or discar= d the mails having infected attachments. On Sat,= 06 Nov 2004 Devdas Bhagat wrote : >On 06/11/04 08:23 -0000, Mange= sh V Rakhunde wrote: > > I run a mail server i.e sendmail= o configured SMTP auth. > > > > > = > > > My problem is mails. Many machines = in and they just send infected mail server itself. = > >Please send in plain text, wrapping the lines at 76 chara= cters, or less. > > >From what I can understand, you h= ave PCs infected by viruses which are >directly sending mail out, = and getting your external IP blacklisted. > >The correct = solution to this is to implement a packet filter which >blocks por= t 25 outbound, and ensures that outbound connections come only > f= rom your real outbound MTA. > >The logs from this packet = filtering firewall will also tell you which >systems are infected = by viruses. > >Devdas Bhagat > >-- = >http://mm.ilug-bom.org.in/mailman/listinfo/linuxers [1] [adstream_nx=] = References 1. 3D"http://clients.rediff.com/signature

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Sendmail Filtering
by Mangesh V Rakhunde 06 Nov '04

06 Nov '04

Hi all I run a mail server i.e sendmail o= n fedora core 2. I have configured SMTP auth. My problem is = I want to reject all incoming or outgoing infected mails. Many machines in = our organisation are infected with viruses and they just send infected mail= s. Can I filter them on my mail server itself. Regards <= BR> Mangesh [1] [Re=] References 1. 3D"http://clien=/

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RE: [ILUG-BOM] [OT] My PC won't start...Please help!
by Sarfaraz Kazi 06 Nov '04

06 Nov '04

> > > Sorry about the OT-ness and length of this post. If > > anybody could provide > > any help, I'll be infinitely thankful. > > only way we could help you is if you send the machine as an > attachment to the > list so we can examine it -:) > > kg mebbe i can ask scotty to beam it up!!!:-) sarfaraz. __________________________________ Do you Yahoo!? Check out the new Yahoo! Front Page. www.yahoo.com

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RE: [ILUG-BOM] [OT] My PC won't start...Please help!
by Sarfaraz Kazi 06 Nov '04

06 Nov '04

> > the system went off in the middle of the installation > > process. now when i > > start the machine, the fans work, hdd works, cd drive > > works but i don't get > > any display and no POST,i.e., i'm not getting the > > single beep on boot. the > > hdd activity led stays constantly on. indicates some > > problem with bios. does > > it has to do anything with the fact that i changed the > > cmos battery while > > the system was down? > > Check your processor and then MB if your processor works well on > another MB. unfortunately, i don't have another system to cross-check the processor with. > Cross check is the best way to narrow down the posibilities. Remove your > processor and refit the assembly, maybe contact problems. This > does not have > anything to do with software installation. i'll try this out. > > Rony. __________________________________ Do you Yahoo!? Check out the new Yahoo! Front Page. www.yahoo.com

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RE: [ILUG-BOM] [OT] My PC won't start...Please help!
by Sarfaraz Kazi 06 Nov '04

06 Nov '04

> It is possible that some part of your motherboard is touching the > base plate of > the cabinet. In such situations the system doesn't boot up. This > *could* have > happened when you depressed the board to install the new CMOS battery. Try > lifting up the board a little with your finger tip. I usually > have insulation > between the board and base plate. > Could be, Could be not, Couldn't say for sure. > > Vivek checked out this possibility. no luck still! __________________________________ Do you Yahoo!? Check out the new Yahoo! Front Page. www.yahoo.com

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RE: [ILUG-BOM] [OT] My PC won't start...Please help!
by Sarfaraz Kazi 06 Nov '04

06 Nov '04

> > hdd activity led stays constantly on. indicates some > > When you put in the new SMPS, did you disconnect/reconnect the > HDD activity LED wire ? > > > -- > quasi > > Utopia Unlimited! yes, i took out all the connectors before putting in the new smps. __________________________________ Do you Yahoo!? Check out the new Yahoo! Front Page. www.yahoo.com

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Re: [ILUG-BOM] online monitoring of log files on gnu-linux, aix and hp-ux
by Eshwar Ponraj 05 Nov '04

05 Nov '04

Hi, I don't have any pointers but this idea might help If you could enable passwordless ssh login to all machines, thru ssh, grep your log files with a pattern and redirect output to a file in those machines, scp that output file into a master node and check if file empty, good else not alert thru mail / console. Good Luck ----- Original Message ----- From: Trevor Warren <trevorwarren(a)yahoo.com> To: ILUG-BOM <linuxers(a)mm.ilug-bom.org.in> Subject: [ILUG-BOM] online monitoring of log files on gnu-linux, aix and hp-ux Date: Wed, 3 Nov 2004 19:32:37 -0800 (PST) > > > Morning Guys/Gals, > > Me has an urgent need of advice from your end. > Hoping for some pointers. > > For one of TCS's client we have configured Nagios > and a host of other GPL'ed applns top aid him in > Network Monitoring as part of a very large project. > This last problem has me stumped. > > In my network consisting of purely > AIX/Gnu-Linux/HP-UX i have to provide a single console > for monitoring all logs and trigger an alert/alarm as > soon as a particular message comes up in the logs. > These logs will be both system and application logs > and hence the messages to be tracked has to be > customisable. > > Lemme know if someone has had this problem solved > before or has any inkling of what appln we can make > use of. > > Trevor > > > > ===== > |------|____________________________________|------| > ( >- / Scaling FreeSoftware & OpenSource \ -< ) > /~\ / In the Enterprise \ /~\ > | \) \ | www.fsf.org | www.opensource.org | / (/ | > |_|_ \____________________________________/ _|_| > > > > __________________________________ > Do you Yahoo!? > Check out the new Yahoo! Front Page. > www.yahoo.com > > > > -- > http://mm.ilug-bom.org.in/mailman/listinfo/linuxers > -- ______________________________________________ Check out the latest SMS services @ http://www.linuxmail.org This allows you to send and receive SMS through your mailbox. Powered by Outblaze

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Linuxers November 2004