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Re: [CentOS] Updating hardware clock from cron
by Matt 04 Mar '11

04 Mar '11

> Is there a package to do this? > > Normally the hardware clock is set during shutdown if one is running ntpd. > But if a long-running server shuts down unexpectedly, this isn't done, and > the hardware clock might be off by a lot when it comes back up. So setting > it periodically from a cron job could be useful. > > What do others do? Adding a one liner to /etc/cron.daily that invokes > /etc/rc.d/init.d/ntpd would do it but it seems heavyweight to restart ntpd. > Alas, the script doesn't export just the sync_hwclock function. I add this to /etc/rc.local /usr/sbin/ntpdate us.pool.ntp.org Sets the clock on start up. Might run it by cron once a month or so too.

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top and allocation issues
by Michael D. Berger 04 Mar '11

04 Mar '11

In a context where exceptions are caught, I ran the fragment: cerr << "allocating" << endl; char* arr[100]; for (int jj = 0; jj < 10; ++jj) { cerr << "jj = " << jj << endl; arr[jj] = new char[2000000000]; sleep (30); } sleep (10); for (int jj = 0; jj < 10; ++jj) delete[] arr[jj]; cerr << "deleted" << endl; The exception was caught with jj = 1, i.e., on the second allocation. But on top, I see: top - 14:08:46 up 5:21, 10 users, load average: 0.04, 0.06, 0.08 Tasks: 158 total, 1 running, 157 sleeping, 0 stopped, 0 zombie Cpu(s): 2.7%us, 2.0%sy, 0.0%ni, 94.5%id, 0.6%wa, 0.1%hi, 0.1%si, 0.0%st Mem: 1941908k total, 1231804k used, 710104k free, 138372k buffers Swap: 3899384k total, 0k used, 3899384k free, 876020k cached and the "710104k free" suggests that I should have failed on the first allocation. Furthermore, the allocation did not alter the values in top (except for a little jitter). Wherein do I err? [~]$ uname -a Linux xxxxx 2.6.18-194.32.1.el5 #1 SMP Wed Jan 5 17:53:09 EST 2011 i686 i686 i386 GNU/Linux Thanks, Mike.

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virtualization on the desktop a myth, or a reality?
by Rudi Ahlers 04 Mar '11

04 Mar '11

I am busy setting up some XEN servers on a SAN for high availability and Cloud Computing, and thought it could be cool to setup virtualization on a CentOS 5.5 Desktop, running on a Core i3 + 4GB RAM, and use the SAN's storage to see if it could actually be worth my while to replicate a Cloud Computing setup in the office. And, cause I got a bit bored waiting for a few RAID-sets to finish initializing. So, I installed CentOS + KDE, chose the Virtualization package and used Virtual Machine Manager to setup another CentOS VM inside CentOS (I only have a CentOS ISO on this SAN, since we don't use Debian / Slackware / FC / Ubuntu / etc). The installation was probably about the same speed as it would be on raw hardware. But, using the interface is painfully slow. I opened up Firefox and browsed the web a bit. The mouse cursor lagged a bit and whenever I loaded a slow / large website, it seemed asif the whole VM lagged behind. The Virtual Machine didn't use much resources. I allocated 1CPU core & 512MB RAM to it Yes, I know that I could have used KVM, VMWare or VirtualBox, but I wanted to use what's included already. Cause, let's face it, many people (even though they're technically advanced users) don't know virtualization. And, granted, when we install Virtual Machines on a XEN server, we don't ever use X since the servers we run as web / email / database / file servers, so there's no need for X. BUT, I want(ed) to see if this is a reality for the average desktop user, or not really (yet?) seeing as most modern PC's have far more CPU & RAM resources than what is actually needed by most. I'm not talking about developers / graphic designers / etc. I'm talking about Bob, who uses his PC for email, internet, document writing, etc and needs to boot into Windows if he feels like playing Warcraft III or StarCraft II, or use Pastel, etc. Wouldn't it be nice to run Windows, of for that matter Solaris / FreeBSD / MAC (graphics designer) / another flavor of Linux / etc inside your favorite Linux, and access it from the Desktop without too much trouble? -- 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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Xen stack scheme
by Jussi Hirvi 04 Mar '11

04 Mar '11

I need to restructure my server farm from tower PC:s to a minimal amount of 1U rack servers. I am going to rely on xen virtualization, as KVM seems not to be very mature yet. My current problem is the mail server, which uses a lot of CPU and I/O. A dedicated machine would be the best option. But would there be any sense in this: - run the mail server in xen dom0 (to get full native performance) - append a couple of light-weight servers as domU:s (like name server) - Jussi Hirvi -- Jussi Hirvi * Green Spot Topeliuksenkatu 15 C * 00250 Helsinki * Finland Tel. +358 9 493 981 * Mobile +358 40 771 2098 (only sms) jussi.hirvi(a)greenspot.fi * http://www.greenspot.fi

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CentOS-announce Digest, Vol 73, Issue 2
by centos-announce-request＠centos.org 04 Mar '11

04 Mar '11

Send CentOS-announce mailing list submissions to centos-announce(a)centos.org To subscribe or unsubscribe via the World Wide Web, visit http://lists.centos.org/mailman/listinfo/centos-announce or, via email, send a message with subject or body 'help' to centos-announce-request(a)centos.org You can reach the person managing the list at centos-announce-owner(a)centos.org When replying, please edit your Subject line so it is more specific than "Re: Contents of CentOS-announce digest..." Today's Topics: 1. CESA-2011:0219 Low CentOS 4 i386 and x86_64 EOL Notice (Johnny Hughes) ---------------------------------------------------------------------- Message: 1 Date: Thu, 03 Mar 2011 19:53:46 -0600 From: Johnny Hughes <johnny(a)centos.org> Subject: [CentOS-announce] CESA-2011:0219 Low CentOS 4 i386 and x86_64 EOL Notice To: CentOS-Announce <centos-announce(a)centos.org> Message-ID: <4D70462A.9060308(a)centos.org> Content-Type: text/plain; charset="iso-8859-1" CentOS Errata and Security Advisory CESA-2011:0219 This is the 1 year notification for the End of Life for the CentOS 4 distribution. The upstream provider will discontinue public updates of their EL4 product on February 29th, 2012. The CentOS Project will end support for CentOS 4 on the same date. CentOS 4, as well as all previously released versions of CentOS, will continue to be available in the Centos Vault: http://vault.centos.org/ This CESA includes a new centos-release file that reminds you of the February 29th, 2012 end of life date. Users still running production workloads on CentOS 4 are advised to begin planning the upgrade to CentOS 5 or (when available) CentOS 6 before the EOL date. For users who are unable to migrate off the EL 4 code base before its end-of-life date, the upstream provider intends to offer a limited, optional extension program. The CentOS Project recommends that you contact their sales team for a price quote for their extended service if you can not move to a newer code base before February 29th, 2012. x86_64: centos-release-4-9.1.x86_64.rpm i386: centos-release-4-9.1.i386.rpm src: centos-release-4-9.1.src.rpm

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HOW to REDIRECT to HTTPS?
by erikmccaskey64 04 Mar '11

04 Mar '11

I'm searching for a method [on client side] to redirect to HTTPS in a few given domains. e.g.: http://www.facebook.com/ to https://www.facebook.com/ Ok. I use several webbrowsers, and not all of them has "add-ons" to redirect these pages to https. My purpose is this: when i go to "http://www.facebook.com" i don't want to see any http traffic with wireshark Is this possible?? How can i achieve it? How can i automatically redirect http traffic for given domain names to HTTPS?? is it enough to redirect http? I mean then the webserver [e.g.: www.facebook.com] recognizes that i want to "talk" over HTTPS? I has a caching-nameserver on my pc - BIND I have an "ad blocking" proxy on my pc - PRIVOXY And my pc is a "linux box" - IPTABLES [iptables only knows ip addresses?]

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RFC: video call recommendations
by m.roth＠5-cent.us 04 Mar '11

04 Mar '11

I run CentOS at home, not just at work... Anyway, I've got a friend in Chicago who recently mentioned that they'd like to do videocalling. Now, I've heard of skype, but a quick google says there's some problems on Linux. I also see ekiga, and aMSN. Anyone here run such a beast, and have any recommendations or comments? Obviously, must work on CentOS, not Ubuntu, or Fedora, or TheLatestCoolestDistroThisMonth.... mark

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CentOS and Marvell SAS/SATA drivers
by Chuck Munro 04 Mar '11

04 Mar '11

Hello all, I've been on a real roller coaster ride getting a large virtual host up and running. One troublesome thing I've discovered (the hard way) is that the drivers for Marvell SAS/SATA chips still have a few problems. After Googling around quite a bit, I see a significant number of others have had similar issues, especially evident in the Ubuntu forums but also for a few RHEL/CentOS users. I have found that under heavy load (in my case, simply doing the initial sync of large RAID-6 arrays) the current 0.8 driver can wander off into the weeds after a while, less so for the older 0.5 driver in CentOS-5. It would appear that some sort of bug has been introduced into the newer driver. I've had to replace the Marvell-based controllers with LSI, which seem rock solid. I'm rather disappointed that I've wasted good money on several Marvell-based controller cards (2 SAS/SATA and 2 SATA). My question ... is anyone aware of the *real* status of these drivers? The Internet is full of somewhat conflicting reports. I'm referring to 'mvsas' and 'sata-mv', both of which seem to have issues under heavy load. It sure would be nice to return to using what appear to be well-made controller cards. I understand that even Alan Cox has expressed some frustration with the current driver status. FWIW, I had similar problems under the RHEL-6 evaluation OS too. Chuck

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how to make a safe php hosting
by Yang Yang 04 Mar '11

04 Mar '11

Hi,erverone i want to do a hosting business,and it is contain centos 5.5 ,php , nginx ,mysql ,proftpd erver use contain a document like /home/htdocs/mike ,and he only use ftp and see that document only and php and mysql is shared for all user is it ok to my design,anyone have good advice for me? and import is: how to make a safe php hosting??please give me some advice

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Re: [CentOS] Centos 6
by Anthony K 04 Mar '11

04 Mar '11

On 3/03/2011 7:14 PM, Sorin Srbu wrote: > Now, can we please not say anything about "when..." in a while? It's rather > tiresome seeing adult people trolling and having fights like three-year-olds in > a sandbox... 8-P > I'm just loving this soap opera - I see it as some form of venting since I'm such a coward and don't want to be flamed for asking obvious (in that the answer is always the same - ready when ready), and absolutely worthless questions. My $0.02! ak.

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