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Software Protection on centos
by premrajm＠digilink.in 03 May '10

03 May '10

Hi, I would like to have a software protection for my hardisk. I have some query regarding that (1) In Centos, is it possible to do a hardisk protection. Ex : Even if the hardisk is taken from a PC and used on another PC, it should not be executable. (2) Also if the entire binary of the source is mounted on a partition say /tmp, is it possible to make that mount point as protected, visible only after entering a password or similar to that. Regards, Premraj M Disclaimer : This message is proprietary to Smartlink Network Systems Ltd. and is intended solely for the use of the individual to whom it is addressed. It may contain privileged or confidential information and should not be circulated or used for any purpose other than for what it is intended. If you have received this message in error, please notify the originator immediately. If you are not the intended recipient, you are notified that you are strictly prohibited from using, copying, altering, or disclosing the contents of this message. The company accepts no responsibility for loss or damage arising from the use of the information transmitted by this email including damage from virus. ______________________________________________________________________________ This email has been scrubbed for your protection by SecureMX. For more information visit http://securemx.in ______________________________________________________________________________

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TCP Tuning/Apache question (possibly OT)
by Kwan Lowe 03 May '10

03 May '10

Hello All: I've been requested to add some TCP tuning parameters to some CentOS 5.4 systems. These tunings are for the TCP receive buffer windows: net.core.rmem_max net.core.wmem_max Information on this tuning is broadly available: http://fasterdata.es.net/TCP-tuning/linux.html http://www.speedguide.net/read_articles.php?id=121 Potential downsides are available: http://www.29west.com/docs/THPM/udp-buffer-sizing.html >From the above, the rmem size is a function of the number of listening processes times the size of the receive buffer. Apache can initially create a bunch of server processes (StartServers directive, for example). In our environment we may spawn off 50 or more httpd listeners. Does each listener allocate its own buffer or is the parent process the only one? The tunable seems innocuous but I am concerned about the impact to memory given that there will be many listener processes. We are running fairly tight already and because these are virtual environments in a cluster, adding a meg or so per listener can equate to multiple gigs across all the machines in the virtual host cluster.

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How to schedule for a repeated task?
by hadi motamedi 03 May '10

03 May '10

Dear All I need to schedule for a repeated task on my CentOS server, as the followings: -) Telnet to a remote node -) Issue a command -) Capture the output in a log -) Logout from Telnet -) Wait for a prescribed time interval -) Then redo , but append the subsequent output in just on file Can you please let me know which options do we have to write such a task? Thank you

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Re: [CentOS] how to find out promiscuous mode
by Les Bell 03 May '10

03 May '10

Vadkan Jozsef <jozsi.avadkan(a)gmail.com> wrote: >> How can I find out that someone is using it's network card in promiscuous mode in a subnet? << http://sourceforge.net/projects/prodetect/ Best, --- Les Bell [http://www.lesbell.com.au] Tel: +61 2 9451 1144

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is it possible to resive /var online?
by Rudi Ahlers 03 May '10

03 May '10

Hi all, Is it possible, safely, to resize /var while a server is running? I urgently need to resize a full 2GB /var on a running server which is located at a remote location where no one can get to it for 2 days? The system runs on lvm. I already moved /var/logs to it's own LVM partition but it didn't help at all so I think it's better to rather just resize it. Google searches suggest taking the server offline, or boot into single mode. But this won't be possible for another 2 or so days and I urgently need to install more software on the server. tia :) -- Kind Regards Rudi Ahlers SoftDux Website: http://www.SoftDux.com Technical Blog: http://Blog.SoftDux.com Office: 087 805 9573 Cell: 082 554 7532

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Re: [CentOS] Sendmail Configuration Problem - 550 5.1.1 - User unknown Problem
by Wang, Mary Y 03 May '10

03 May '10

It's working now. I just commented out some of the FEATURE lines in sendmail.mc file. Mary _____________________________________________ From: Wang, Mary Y Sent: Saturday, May 01, 2010 6:21 PM To: 'centos(a)centos.org' Subject: Sendmail Configuration Problem - 550 5.1.1 - User unknown Problem Hi, I'm having this Sendmail configuration problem and stuck. I've been doing googling/reading posts and none of the solutions matched my problem. I'm doing some testing, and have been getting this 550 5.1.1 ....User unknown error when I send the email to my company's email address. When I send it to an external email address, such as yahoo, the message delivered successfully. Of course, I'm doing the configuration behind a firewall. I'm using a relay too, and I did declare the relay host in 'SMART_HOST' in the sendmail.mc file and have also recompiled it to produce the sendmail.cf. I also restarted the sendmail service. ---------------------------------------------------------------------------------------------------------------------------------------------------- telnet ana.boeing.com 25 Trying 134.51.151.114... Connected to ana.boeing.com (134.51.151.114). Escape character is '^]'. 220 ana.boeing.com ESMTP Sendmail 8.12.11.20060308/8.12.11; Sat, 1 May 2010 16:39:06 -0700 helo ana.boeing.com 250 ana.boeing.com Hello ana.boeing.com [134.51.151.114], pleased to meet you mail from:root@ana.boeing.com 250 2.1.0 root(a)ana.boeing.com... Sender ok rcpt to:mary.y.wang@boeing.com 550 5.1.1 mary.y.wang(a)boeing.com... User unknown Any ideas? I'm running on Sendmail 8.12.11 Mary

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DNSSEC
by m.roth＠5-cent.us 02 May '10

02 May '10

Well, folks, There's an article on slashdot, <http://tech.slashdot.org/article.pl?sid=10/04/30/1258234> Excerpt: ...the coming milestone of May 5, at 17:00 UTC at this time DNSSEC will be rolled out across all 13 root servers. Some Internet users, especially those inside corporations and behind smaller ISPs, may experience intermittent problems. The reason is that some older networking equipment is pre-configured to block any reply to a DNS request that exceeds 512 bytes in size. DNSSEC replies are typically four times as large. --- end excerpt --- I followed the link from the story to <https://www.dns-oarc.net/oarc/services/replysizetest>, a coordinating organization, and tried their test (as root): dig +short rs.dns-oarc.net txt And see that where I work, we're not ready. Is anyone following this, and/or have a HOWTO on enabling it for CentOS? mark (need to check this at home, too)

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boot Debian on a RouterStation Pro
by Jozsi Vadkan 02 May '10

02 May '10

Can anyone post a howto/doc, help about booting a Debian on a RouterStation Pro?:\ https://forum.openwrt.org/viewtopic.php?pid=108415#p108415 I still didn't manage to boot from it. Or any other "normal distro" :\ Thank you.. p.s.: a little more detailed howto:\

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Sendmail Configuration Problem - 550 5.1.1 - User unknown Problem
by Wang, Mary Y 02 May '10

02 May '10

Hi, I'm having this Sendmail configuration problem and stuck. I've been doing googling/reading posts and none of the solutions matched my problem. I'm doing some testing, and have been getting this 550 5.1.1 ....User unknown error when I send the email to my company's email address. When I send it to an external email address, such as yahoo, the message delivered successfully. Of course, I'm doing the configuration behind a firewall. I'm using a relay too, and I did declare the relay host in 'SMART_HOST' in the sendmail.mc file and have also recompiled it to produce the sendmail.cf. I also restarted the sendmail service. ---------------------------------------------------------------------------------------------------------------------------------------------------- telnet ana.boeing.com 25 Trying 134.51.151.114... Connected to ana.boeing.com (134.51.151.114). Escape character is '^]'. 220 ana.boeing.com ESMTP Sendmail 8.12.11.20060308/8.12.11; Sat, 1 May 2010 16:39:06 -0700 helo ana.boeing.com 250 ana.boeing.com Hello ana.boeing.com [134.51.151.114], pleased to meet you mail from:root@ana.boeing.com 250 2.1.0 root(a)ana.boeing.com... Sender ok rcpt to:mary.y.wang@boeing.com 550 5.1.1 mary.y.wang(a)boeing.com... User unknown Any ideas? I'm running on Sendmail 8.12.11 Mary

2 1

32-bit boot CD for 64-bit install using kickstart
by Carlos S 02 May '10

02 May '10

Hi, I am using kickstart method for CentOS installation. The install is done using mirror site URL and not CD/DVD ISOs. However, the system is initially booted from 32-bit CentOS CD. When the install process starts I get errors as: - package rpm not found - abort/continue? - package lvm2 not found - abort/continue? - package grub not found - abort/continue? - ... - ... If I change install URL to 32-bit ISOs then everything works fine. Do I need to use 64-bit boot CD for this install? -- CS.

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