Discuss July 2011

discuss@lists.centos.org

315 participants
289 discussions

CentOS and Bandwidth
by Michael Peterson 10 Jul '11

10 Jul '11

I am looking forward to using CentOS 6 soon. I have the torrent running to download and help others download it. I am trying out Scientific Linux 6 while awaiting the arrival of CentOS 6. It took a lot of work to get it installed and configured on a system. I plan to run them both on 2 systems and see what happens. I look forward to the release of CentOS 6.1 soon also. Let me know where I can browse to see if I can help in any areas other than the torrent. If I have a T1 size pipe going out what is my max possible kB out? I have the torrent turned up to 100kB and my VPN still seems responsive. Thanks for all the hard working in getting this release ready. Good job on getting CentOS 5.6 out first however.

2 1

bond0 performance issues in 5.6
by Digimer 10 Jul '11

10 Jul '11

Hi all, I've got two gigabit ethernet interfaces bonded in CentOS 5.6. I've set "miimode=1000" and I've tried "mode=" 0, 4 and 6. I've not been able to get better than 112MB/sec, which is the same as the non-bonded interfaces. My config files are: === cat /etc/sysconfig/network-scripts/ifcfg-{eth1,eth2,bond0} # SN1 HWADDR=00:30:48:fd:26:71 DEVICE=eth1 BOOTPROTO=none MASTER=bond0 SLAVE=yes # SN2 HWADDR=00:1B:21:87:80:CE DEVICE=eth2 BOOTPROTO=none MASTER=bond0 SLAVE=yes # Bonded interfaces for Storage Network DEVICE=bond0 IPADDR=192.168.21.80 NETMASK=255.255.255.0 ONBOOT=yes BOOTPROTO=none USERCTL=no BONDING_OPTS="miimon=1000 mode=0" === I'm running benchmarks using iperf (.90 is the second machine with a matching bonded connection): === iperf -f M -c 192.168.21.90 ------------------------------------------------------------ Client connecting to 192.168.21.90, TCP port 5001 TCP window size: 0.02 MByte (default) ------------------------------------------------------------ [ 3] local 192.168.21.80 port 35728 connected with 192.168.21.90 port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.0 sec 1086 MBytes 109 MBytes/sec === This is the speed a non-bonded interface: === iperf -f M -c 192.168.22.90 ------------------------------------------------------------ Client connecting to 192.168.22.90, TCP port 5001 TCP window size: 0.02 MByte (default) ------------------------------------------------------------ [ 3] local 192.168.22.80 port 57475 connected with 192.168.22.90 port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.0 sec 1125 MBytes 112 MBytes/sec === The switch is a D-Link DGS-3100, which is a managed switch that I believe is capable of 801.3ad (for mode=4). Any advice? -- Digimer E-Mail: digimer(a)alteeve.com Freenode handle: digimer Papers and Projects: http://alteeve.com Node Assassin: http://nodeassassin.org "I feel confined, only free to expand myself within boundaries."

3 2

CentOS 6 supported hardware
by Mark Weaver 10 Jul '11

10 Jul '11

Has anyone seen a supported hardware list on CentOS 6? I've been looking around for the last few days; even looked at RedHat's site but didn't find one. I've got a Dell Inspiron 1501 with a Dell Wireless 1390 WLAN mini-card in it and I'm trying to find out if it's going to have native driver support for the WIFI. thanks, -- Mark Weaver Computer Information Systems & Services, Inc. mweaver(a)compinfosystems.com (717) 512-9718

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Wierd cursor jump when I type letter "y"
by Ljubomir Ljubojevic 10 Jul '11

10 Jul '11

Guys. I have this problem for a long time. In large number of times when I type letter "y", like in "you" my typing cursor jumps 2-3 rows up or 1-2 words to the left. I am unable to understand why. Could it be something with lap-top keyboard? Typing rate? CentOS 5.5 Gnome, I mostly use Firefox and Thunderbird. Ljubomir

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Re: [CentOS] Triggering script from cron or web client
by Emmanuel Noobadmin 10 Jul '11

10 Jul '11

On 7/9/11, Kenneth Porter <shiva(a)sewingwitch.com> wrote: > I have a Bash script, currently run a couple times an hour from cron, that > pulls data from an old Windows DB by rsync, converts it to SQL, and injects > it into a MySQL DB for display in a LAMP-based app. (Make and Perl are also > involved to minimize the number of tables touched and to clean up the SQL > generated by Pxlib.) > > I'd like to add the ability to refresh the data immediately from the web > app, but I don't want it to trample on the periodic script and corrupt the > data. Offhand, I think checking for a lock file before starting is probably the easiest way to do it. That's what I do for scripts that are cronjobs but can also be initiated manually. However, this might not work if your web app is inserting/updating the data in MySQL directly rather than simply starting a new import process as I'm assuming.

1 0

Triggering script from cron or web client
by Kenneth Porter 09 Jul '11

09 Jul '11

I have a Bash script, currently run a couple times an hour from cron, that pulls data from an old Windows DB by rsync, converts it to SQL, and injects it into a MySQL DB for display in a LAMP-based app. (Make and Perl are also involved to minimize the number of tables touched and to clean up the SQL generated by Pxlib.) I'd like to add the ability to refresh the data immediately from the web app, but I don't want it to trample on the periodic script and corrupt the data. I figure the ideal way to do this is to run the script in a loop in its own process, waiting on a semaphore that times out at the refresh period, and poke the semaphore from the web app to have it run before the next periodic cycle. Are there existing frameworks to wrap this kind of thing in? Something that handles starting the loop at server startup, shutting it down at server halt, and handles the IPC between the web server and the service script.

5 9

Is it safe to run tune2fs -c -1 -i 0 /dev/sda2 on mounted file system
by Sherin George 09 Jul '11

09 Jul '11

Hi, Is it safe to run tune2fs -c -1 -i 0 /dev/sda2 on mounted file system Basically, this is a command to disable fsck based on reboot count & last fsck time. -- Regards, Sherin

7 6

There ain't a CentOS autotools bug!
by John J. Boyer 08 Jul '11

08 Jul '11

Lars Hecking found the problem. Quitge some time ago configure.ac had been edited in Windows. This left dos line breaks. When I removed these liblouisutdml built fine. John -- John J. Boyer; President, Chief Software Developer Abilitiessoft, Inc. http://www.abilitiessoft.com Madison, Wisconsin USA Developing software for people with disabilities

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java annoyances
by m.roth＠5-cent.us 08 Jul '11

08 Jul '11

Fresh install on a brand new box (Dell Precision 3500) of 5.6. I install Sun java-1.6.0_26-b03, Java HotSpot(TM) 64-Bit Server VM (build 20.1-b02, mixed mode) <snip> A followup: from Oracle's website, at <http://www.oracle.com/technetwork/java/javase/manual-plugin-install-linux-1…>: Excerpt: Notes * The classic plugin file was located here: <JRE>/plugin/i386/javaplugin-oji.so This file should no longer be used and all symbolic links to it removed. --- end excerpt --- mark

4 4

java annoyances
by m.roth＠5-cent.us 08 Jul '11

08 Jul '11

Fresh install on a brand new box (Dell Precision 3500) of 5.6. I install Sun java-1.6.0_26-b03, Java HotSpot(TM) 64-Bit Server VM (build 20.1-b02, mixed mode) Then ln -s /usr/lib/jvm/java-1.6.0-sun-1.6.0.26.x86_64/jre/lib/amd64/libnpjp2.so /usr/lib64/mozilla/plugins about:plugins shows java enabled (oddly enough, I seem to have flash, 32-bit, in the 32 bit libs, and that doesn't show; guess I need to install nspluginwrapper). I go to the java tester, as recommended on the CentOS wiki, <http://javatester.org/version.html>, no pink rectangle, and if I click on the enabled link, firefox crashes, with firefox --no-remote -P Exception in thread "main" java.lang.NoClassDefFoundError: sun/plugin2/main/server/MozillaPlugin Caused by: java.lang.ClassNotFoundException: sun.plugin2.main.server.MozillaPlugin at java.net.URLClassLoader$1.run(URLClassLoader.java:202) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:247) Segmentation fault Anyone got any ideas what's wrong? Clues for the poor? mark

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Discuss July 2011