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Strange slapd behavior...
by Stjepan Gros 27 May '08

27 May '08

Hi all, I have problems on one CentOS 4.6 with slapd. Namely, after trying to start it (via /etc/init.d/ldap start) it waits for very long in configuration check. Interestingly, when I try to start it manually, but without "-u ldap" option it starts immediately. What puzzles me more is the use of NETLINK socket when started with -u option that doesn't appear in strace output without using the option. I did grep through the source of the openldap for NETLINK but nothing was found. Can someone shed some lite on what's happening? Thanks, Stjepan

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Centos on new intel processor
by nightduke 27 May '08

27 May '08

Hi i wish to know if anyone has installed Centos in a new type of processor, intel atom. Thanks Nightduke

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IPTables help
by Joseph L. Casale 27 May '08

27 May '08

I have a dual homed server in an install for someone who is very cost sensitive. This server originally is being setup as an Asterisk server, but now the simplest thing for me to do is also set it up to provide internet access for the small shop as well. So it will have one external, WAN facing nic that needs all incoming ports except UDP 5060 and 10000 -> 60000 blocked for all but two ips. The internal, LAN facing NIC will need all ports except voip/dns/http blocked to it, and need to provide masquerading. I have limited experience with iptables and would love some guidelines. Any pointers would be greatly appreciated! Thanks, jlc

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Existenial doubt about Xen and LVMs
by Sergio Belkin 27 May '08

27 May '08

Hi, I have a Dom0 with LVMs. Also, I have 2 DomU's. What happen with DomU partitions if I resize Dom0 volumes? They changes of size too? Thanks in advance -- -- Open Kairos http://www.openkairos.com Watch More TV http://sebelk.blogspot.com Sergio Belkin -

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Re: RAID5 or RAID50 for database?
by Scott Silva 27 May '08

27 May '08

on 5-22-2008 9:58 PM Bahadir Kiziltan spake the following: > You need at least 6 drives for RAID5. I don't know if Perc 4e/Di > allows configuring the RAID5. > Where did you get this bit of information? You can create a raid 5 with 3 or more disks. -- MailScanner is like deodorant... You hope everybody uses it, and you notice quickly if they don't!!!!

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best disk configuration
by Mag Gam 26 May '08

26 May '08

I have 12 750GB drive appliance from HP. I was wondering what is the best disk configuration? I suppose a large RAID5 would be bad since rebuilding would take too long. What do you recommend? TIA

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read only root file system
by Fred Noz 26 May '08

26 May '08

On Saturday 24 May 2008 12:05:30 Fred Noz wrote: > Responding to a question posted earlier this month, Centos 5.1 > includes configuration files for enabling the read-only root > filesystem. Actually, all filesystems can be mounted read-only with > particular files and directories mounted on a read-write tmpfs (in > RAM). This capability comes directly from the upstream provider. > When your computer comes back up, the root and any other system > partitions will be mounted read-only. All the files and directories > listed in /etc/rwtab will be mounted read-write on a tmpfs filesystem. > You can add additional files and directories to rwtab to make them > writable after reboot. > > Note that this system is stateless. When you reboot again, everything > written to the tmpfs filesystem vanishes and the system will be > exactly as it was the last time it was booted. You could add a > writable filesystem on disk or NFS for writing files you want to > retain after rebooting. This is very interesting. Thanks for the sharing Fred. So, it's somekind of Live CD on a disk? I can't think of a practical benefit of using such system, is it to protect it from unwanted modification? Fajar Priyanto | Reg'd Linux User #327841 | Linux tutorial ----- Fajar, There are many practical reasons why one would want to run a Linux system, whether it be desktop or server, with a read-only root. One reason is for ease of maintenance, especially when there are many systems to maintain. You might be administering computers in a classroom, internet access point, or library and you want to be certain that after reboot, the system is exactly as it was the last time it was rebooted, even if the users mess with the system accidentally or on purpose. For example, if a user fills up the /tmp filesystem and causes the system to crash, after booting, the system will have an empty /tmp filesystem. It will not require that fsck to be run because the other filesystems were mounted read-only. This implies no risk of filesystem corruption (except due to physical failures on the disk). Not needing fsck saves time on boot. You could use read-only root on embedded systems where there is no way an administrator could get to the system to fix it. Read-only root is beneficial on a system running on flash media because this avoids having recurring writes wear out some sectors on the media. This is a practical way to run a large group of diskless systems. A single read-only root filesystem can be made available on a network from an NFS server. Many diskless clients can use this readonly-root simultaneously. Of course, this is a way to implement a live CD. In addition to easy maintenance, readonly-root adds a layer of security. The security is broken if someone gains access to the root user, but then many security protections are lost if someone gains root. Even a Database server can benefit from being run on read-only root. The data disk would certainly be mounted read-write, but there is no reason why the operating system and database application software need to be on disks mounted read-write. When an administrator wants to perform an update, upgrade, software, installation. or other system change, the administrator sets the readonly filesystems to read-write using a simple mount command. After the administrator finishes making the changes, a simple mount command (or reboot) sets the readonly filesystems back to read-only. Of course, on systems where the root and system filesystems have no physical write capability, such as on a live CD, they cannot be set to read-write. - Fred --------- Fred Noz Fred(a)Noz.net

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Chip set support
by John Bowden 26 May '08

26 May '08

Hi folks. I,m thinking of purchasing an ASUS mother board with this chip set in it. NVIDIA® nForce® 430 MCP Lan= NVIDIA® nForce® 430 MCP built-in Gigabit MAC with external Attansic PHY. Any one know how well the chip set is supported. Any comments? Thanks John -- Guy Fawkes, the only man to enter the houses of Parliament with honest intentions, (he was going to blow them up!) Registered Linux user number 414240

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COBOL
by Michael 26 May '08

26 May '08

Just curious, maybe some old timers could help me out. I am working with a company that is migrating 20 years of Mainframe Software Development to Unix, HPUX. How much harder would it be to go to Linux, Centos Linux? Also, anyone have any experience with Fujitsu Cobol on Centos? The Fujitsu people only support Red Hat, and said I'd be on my own with Centos. In other words if it works, then I don't care about Fujitsu support. I know some of you are thinking, did someone say "COBOL"? Nobody uses COBOL anymore! If so, let me say "You are wrong". Many large corporations are taking their old business logic that was written in COBOL decades ago, and moving it to new modern platforms, like Linux. Programatically giving these applications a GUI face-lift, while maintaining their original business logic. I know because many companies pay me to do just that. I have a client that wants to use Centos Linux with Fujistu Cobol, and Fujitsu says it's gotta be Red Hat, any help will much appreciated. Thanks, -- Michael Anderson, J3k Solutions Sr.Systems Programmer/Analyst 832.515.3868

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RAID5 or RAID50 for database?
by mcclnx mcc 26 May '08

26 May '08

we have DELL 6800 server with 12 internal disks in it. O.S. is CENTOS 4.6 and SCSI control card is PERC 4e/di. We plan to configure 4 disks (5,8,9,10) as RAID5 or RAID50. This logical volume will be use as file systems and store database backup files. Can anyone tell me which one is better on performance? Thanks. 付費才容量無上限？Yahoo!奇摩電子信箱2.0免費給你，信件永遠不必刪！ - 馬上體驗！

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