Discuss June 2008

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353 participants
415 discussions

tcp_tw_recycle / tcp_tw_reuse
by nate 05 Jun '08

05 Jun '08

Anyone have experience with these kernel parameters? I can't find a whole lot of info on them. I have a situation where I'm trying to stress test a server, dual proc quad core with a tomcat application that is really fast. We can get it to about 60% CPU usage, and processing about 1,350 requests a second but we can't get much past that. It seems we are maxing out the sockets on the system, with more than 60,000 connections in TIME_WAIT. Our requests are really small and light and short lived. So I was thinking of using these parameters to get more out of the tcp stack. Our load balancer is configured to terminate connections to the world after 25 seconds(a typical request takes 0.1 seconds to complete), but I'm not sure if that applies to the systems behind the load balancer as well(I suspect not because there's no apparent setting for that). Currently I have the system configured to take a lower amount of traffic, hovering at around 47% CPU, at around 833 req/s and it has 43k connections in these states: #### state ------------------ 65 CLOSING 94 ESTABLISHED 172 FIN_WAIT1 50 FIN_WAIT2 10 LAST_ACK 497 SYN_RECV 43480 TIME_WAIT On a side note, the 'active tcp sockets' reported by sar seems wildly inaccurate, it reports only ~10 active tcp sockets, it barely varies from the system being idle to the system being maxxed out. The docs I can find says seek expert assistance..any experts reading this ? Running CentOS 4.6 thanks nate

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Re: several servers
by roberto.barrientos＠umag.cl 05 Jun '08

05 Jun '08

ok..i can install dovecot+postfix+MYSQL..etc..and maybe the problem it's resolve. i don't have problem with the machines, the machines are goods, my problem is the tranparent receive e-mails to the users than are distributed in four machines with the same number the users and different users in each. as does google??. they have one entry to e-mail system (gmail.com) but they have several machine (maybe thousands) in transparent mode. i read something like LVS...some comment about this software..! is my solution or I'm lost? Roberto.- -- Roberto Barrientos Molina Administración TIC 207153-207140-207109 UMAG NOTA: Los acentos han sido omitidos intencionalmente.-

3 2

rpm -q versus what's installed
by Scott R. Ehrlich 05 Jun '08

05 Jun '08

I am trying to install Oracle client 10g (10.2.0) on a 64-bit CentOS 5.0 system. 'rpm -q make gcc glibc etc' reveals some packages as "not installed", yet a yum install <package name> consistently returns Nothing to do. Yum list available <package name> yields nothing needed. If rpm -q <list of packages> lists some that are "not installed" but every variant of yum install and yum list I've tried and googled claiims nothing more needs to be installed, either the OS is misreporting (I doubt that) or I'm missing something that is not easily being revealed, or that I haven't used in a long time and outright forgetting. I still need (per rpm -q): compat-gcc compat-gcc-c++ compat-libstsdc++-devel openmotif21 gnome-libs There has been a suggestion of the version of Oracle (32 or 64 bit) I'm trying to install, but after thinking about it, I believe this question is a more fundamental operating system issue. Thanks for any insight. Scott

5 4

centos 4 on ebox 2300sx
by Jerry Geis 05 Jun '08

05 Jun '08

hi all, I am attempting to install centos 4.4 on an ebox 2300sx. I start with "i586 text" everything starts up and then I get: No coprocessor found and no math emulation present. How do I get math emulation? THanks Jerry

3 5

tzdata, Greenwich zone: URGENT!
by Guy Boisvert 05 Jun '08

05 Jun '08

Hi! It appears that there have been some changes to tzdata recently. We run an application that needs the server to stay at GMT. Previously, we used the Casablanca timezone but now there seems to be a 1 hour difference to GMT. I checked the London zone and they seem to change time too. I tried to change the zone to GMT with system-config-date (i'm using command line remotely) but didn't find the Greenwich zone! Is there any way to fixed this ? [boig01@iode ~]$ date Tue Jun 3 14:10:21 WEST 2008 [boig01@iode ~]$ date -u Tue Jun 3 13:10:24 UTC 2008 Thanks in advance. Guy Boisvert, ing. IngTegration inc. P.S.: As i'm writing this, our application just started to desync !!! HOW CAN I ROLL BACK TZDATA ???? I Googled all over without finding any way to do it!

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Mounting cifs shares by non-root users on CentOS 4.6
by James Pearson 05 Jun '08

05 Jun '08

I'm trying to set up mounting of a Windows share for non-root users via /etc/fstab on a CentOS 4.6 box - I've followed the instructions at: <http://wiki.centos.org/TipsAndTricks/WindowsShares> Using something like the /etc/fstab example given in the wiki page (with, of course, using a valid share, username and password for my set up): //winbox/getme /mnt/win cifs user,uid=500,rw,suid,username=sushi,password=yummy 0 0 When as a non-root user I do: % mount /mnt/win mount error 1 = Operation not permitted Refer to the mount.cifs(8) manual page (e.g.man mount.cifs) Running mount as root works fine, but I can not get it to work for non-root users. Any ideas? Thanks James Pearson

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CentOS-announce Digest, Vol 40, Issue 2
by centos-announce-request＠centos.org 05 Jun '08

05 Jun '08

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-2008:0516 Critical CentOS 4 ia64 evolution - security update (Pasi Pirhonen) 2. CESA-2008:0516 Critical CentOS 3 ia64 evolution - security update (Pasi Pirhonen) 3. CESA-2008:0498 Moderate CentOS 3 ia64 cups - security update (Pasi Pirhonen) 4. CESA-2008:0498 Moderate CentOS 4 ia64 cups - security update (Pasi Pirhonen) 5. CESA-2008:0498 Moderate CentOS 3 s390(x) cups - security update (Pasi Pirhonen) 6. CESA-2008:0498 Moderate CentOS 4 s390(x) cups - security update (Pasi Pirhonen) 7. CESA-2008:0515 Important CentOS 4 ia64 evolution28 - security update (Pasi Pirhonen) 8. CESA-2008:0516 Critical CentOS 4 s390(x) evolution - security update (Pasi Pirhonen) 9. CESA-2008:0516 Critical CentOS 3 s390(x) evolution - security update (Pasi Pirhonen) 10. CESA-2008:0515 Important CentOS 4 s390(x) evolution28 - security update (Pasi Pirhonen) ---------------------------------------------------------------------- Message: 1 Date: Wed, 4 Jun 2008 16:42:10 +0300 From: Pasi Pirhonen <upi(a)centos.fi> Subject: [CentOS-announce] CESA-2008:0516 Critical CentOS 4 ia64 evolution - security update To: centos-announce(a)centos.org Message-ID: <20080604134210.GC22302(a)centos.fi> Content-Type: text/plain; charset="us-ascii" CentOS Errata and Security Advisory 2008:0516 https://rhn.redhat.com/errata/RHSA-2008-0516.html The following updated files have been uploaded and are currently syncing to the mirrors: ia64: updates/ia64/evolution-2.0.2-35.0.4.c4.2.ia64.rpm updates/ia64/evolution-devel-2.0.2-35.0.4.c4.2.ia64.rpm -- Pasi Pirhonen - upi(a)iki.fi - http://pasi.pirhonen.eu/ Top-postings silently ignored

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centos RS232 to IP port program
by Jerry Geis 05 Jun '08

05 Jun '08

Hi all, Is there a method in centos where a program can be started that listens on a given IP port and when something connects it will transfer data from the RS232 port to the IP port. reads and writes of course. Trying not to reinvent the wheel if I dont have to... Thanks, Jerry

3 2

a anaconda test problem
by zchen 05 Jun '08

05 Jun '08

I am building a latest CentOS5 and every newest stuff is ready. All are in directory "/linux/CentOS/5-respin/os/x86_64". My OS is CentOS5 too. I want to add some other pictures during installation process, so anaconda adjustment is needed. When I run command "anaconda --test --method=http://192.168.0.3/linux/CentOS/5-respin/os/x86_64", a error message followed: Traceback (most recent call last): File "/usr/sbin/anaconda", line 702, in ? for i in os.listdir("/mnt/runtime/usr/sbin"): OSError: [Errno 2] There is no such file or directory: '/mnt/runtime/usr/sbin' I mkdir -p /mnt/runtime/usr/sbin,than it works.Followed the steps and configured to kickstart page, clicked "Next" button.There is a message said: 09:59:09 CRITICAL: Traceback (most recent call first): File "/usr/lib/anaconda/urlinstall.py", line 95, in systemMounted self.loopbackFile = "%s%s%s" % (chroot, File "/usr/lib/anaconda/yuminstall.py", line 1330, in doPreInstall if self.method.systemMounted (anaconda.id.fsset, anaconda.rootPath): File "/usr/lib/anaconda/backend.py", line 180, in doPreInstall anaconda.backend.doPreInstall(anaconda) File "/usr/lib/anaconda/dispatch.py", line 201, in moveStep rc = stepFunc(self.anaconda) File "/usr/lib/anaconda/dispatch.py", line 124, in gotoNext self.moveStep() File "/usr/lib/anaconda/gui.py", line 1018, in nextClicked self.anaconda.dispatch.gotoNext() File "/usr/lib/anaconda/iw/progress_gui.py", line 243, in renderCallback self.intf.icw.nextClicked() File "/usr/lib/anaconda/gui.py", line 1045, in handleRenderCallback self.currentWindow.renderCallback() IndexError: list index out of range Which option should I added? Did I forgot something else? Is there anyway to fix it? Thanks in advance.

1 0

Managing Eclipse Plugins
by Clint Dilks 05 Jun '08

05 Jun '08

Hi People, I just wondered if anyone had an suggestions on how to manage Eclipse plugins where RPMS don't exist for the particular plugin. In this case Aptana. Using the instructions here http://www.aptana.com/docs/index.php/Plugging_Aptana_into_an_existing_Eclip… I can install the plugin manually to /usr/share/eclipse so that its available to all users on the box. But I need to install this plugin on a high number of machines. I know I could install it on a single machine and then tar up /usr/share/eclipse and turn this into an rpm. But I think this will be asking for trouble in the long run. So I then did some research and found that I should be able to use eclipse update manager from the command line see http://help.eclipse.org/help32/index.jsp?topic=/org.eclipse.platform.doc.is… Thinking that perhaps I could use a script to do the install or use a script to create an RPM. But so far I can't get any of the Eclipse Update Manager commands to work. Asking on some eclipse Newsgroups has got a couple of cryptic responses. So I thought I would ask if anyone had ideas about the best way to achieve what I am after. Also if anyone uses the Eclipse Update Manager from the command line and can give me an example of a command line that works, it would be much appreciated. Thanks

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Discuss June 2008