Discuss July 2010

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242 participants
193 discussions

kernel mod compilation frustration
by m.roth＠5-cent.us 20 Jul '10

20 Jul '10

I want to add a sleep() to a module. It tells me it can't find <time.h>; if I tell it "/usr/include/time.h", it gives me a ton of errors (I *have* put the #include just above where I call sleep, not up at the top). Any clues as to what I'm doing wrong? With kernel /vmlinuz-2.6.18-194.3.1.el5, I just added the line extern unsigned int sleep( unsigned int seconds ); and everything was wonderful; with the current kernel, it complains sleep is undefined. ?? mark

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GFS performance issue
by Fred Wittekind 20 Jul '10

20 Jul '10

Two web servers, both virtualized with CentOS Xen servers as host (residing on two different physical servers). GFS used to store home directories containing web document roots. Shared block device used by GFS is an ISCSI target with the ISCSI initiator residing on the Dom-0, and presented to Dom-U webservers as drives. Also, providing a second shared block device for quorum disk. If I hit the web site on just one of the nodes, it behaves as expected. If I try to load the websites from both nodes at the same time (two web browser instances), the load average on both nodes spikes, and page loads very slowly. The site I am trying to host is very high traffic, and if the servers can be nearly brought to there knees with two web browser instances running on a single workstation, that's not going to work. I am not seeing any error messages in the logs regarding the cluster. Any help or suggestions on how to troubleshoot this issue would be greatly appreciated. [root@www3 www]# find ./ | wc -l 64815 [root@www3 www]# gfs2_tool df /home/www /home/www: SB lock proto = "lock_dlm" SB lock table = "Web:homewww" SB ondisk format = 1801 SB multihost format = 1900 Block size = 4096 Journals = 2 Resource Groups = 316 Mounted lock proto = "lock_dlm" Mounted lock table = "Web:homewww" Mounted host data = "jid=1:id=393217:first=0" Journal number = 1 Lock module flags = 0 Local flocks = FALSE Local caching = FALSE Type Total Blocks Used Blocks Free Blocks use% ------------------------------------------------------------------------ data 20707148 4347237 16359911 21% inodes 16426386 66475 16359911 0% [root@www3 www]# gfs2_tool gettune /home/www new_files_directio = 0 new_files_jdata = 0 quota_scale = 1.0000 (1, 1) logd_secs = 1 recoverd_secs = 60 statfs_quantum = 30 stall_secs = 600 quota_cache_secs = 300 quota_simul_sync = 64 statfs_slow = 0 complain_secs = 10 max_readahead = 262144 quota_quantum = 60 quota_warn_period = 10 jindex_refresh_secs = 60 log_flush_secs = 60 incore_log_blocks = 1024 [root@www3 www]# cat /etc/cluster/cluster.conf |egrep '(dlm)|(gfs)' <dlm plock_ownership="1" plock_rate_limit="0"/> <gfs_controld plock_rate_limit="0"/> Fred Wittekind

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acl and chmod interaction
by Markus Falb 20 Jul '10

20 Jul '10

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 #$ setfacl -m u:mf:r bla #$ getfacl bla # file: bla # owner: root # group: root user::rw- user:mf:r-- group::r-- mask::r-- other::r-- It is readable by mf like intended. #$ chmod go-rwx bla #$ getfacl bla # file: bla # owner: root # group: root user::rw- user:mf:r-- #effective:--- group::r-- #effective:--- mask::--- other::--- It is not readable no more by mf which was not intended. Obviously the mask:: is cleared, but why ? OTOH group::r ? Confused am i - -- Regards, markus -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (Darwin) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAkxE6wEACgkQYoWFBIJE9eVXMwCfRWhN2OKvi4WyJUumB7leuCGY v3UAoIEAzpq+m96IQeilRIXSAdNEU6km =FOj6 -----END PGP SIGNATURE-----

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RDAC for IBM DS4700
by Wahyu Darmawan 20 Jul '10

20 Jul '10

Hi all, I have problem with my servers. I use two of HP Blade Servers and RHEL 4.6 installed on them, and have IBM DS4700 connected to them. In those servers are running RHCS (Red Hat Cluster Suite) with GFS for handling Oracle Database. Yesterday, I had missing one partition from the storage, suddenly. I called IBM and they suggested to use RDAC. The question is, Why should use IBM RDAC for multipath on RHEL 4, and why HP Blade + HP EVA Storage don't use any addition plugins software to keep server + storage connection? I appreciate for some reasons by all of you. Thank you. Regards, Wahyu

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Want MySQL source rpms pertinent to CentOS 5.4; what packages should I request via yum?
by Kenneth Wolcott 19 Jul '10

19 Jul '10

Hi; I want MySQL source rpms pertinent to CentOS 5.4; what packages should I request via yum? I first went to mysql.org but I could not find (perhaps I am blind) any MySQL source tarballs or rpms, only binary rpms. I would like to compile MySQL from source. BTW, what happened to centos.org? When using Firefox or Chrome it looks like it is text-only as if I were visiting it with lynx! Thanks in advance for pointers/advice towards answering a very lame question. Ken Wolcott kennethwolcott(a)gmail.com

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Problem with yum
by James B. Byrne 19 Jul '10

19 Jul '10

I am experiencing a problem with yum on one of my CentOS-5.5 systems. Specifically, on Friday past (July 16), I ran yum update as root. Yum displayed all of the outdated packages and asked if I wanted to proceed. An answered yes. This first package downloaded was nss. At this point yum simply stopped processing or responding. A ctrl-c at the yum session terminal window did not interrupt the task. Top did not display any yum processes. I killed that particular process to regain the console session, but I had to use -9 because nothing else worked. Yum continues to behave in this strange manner. Any invocation of yum with any option just stops responding. Before I manually remove yum and reinstall it using rpm could anyone provide a clue as to what might be happening here and how it might be cured. I found this one entry from yum in the log files: /var/log/messages.1:Jul 16 00:14:43 gway01 kernel: Out of memory: Killed process 1380, UID 0, (yum-updatesd-he). However, this entry occurred some time before I attempted my update task later that same morning. I would like to be directly copied on any replies as I am a digest subscriber. Sincerely, -- *** E-Mail is NOT a SECURE channel *** James B. Byrne mailto:ByrneJB@Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3

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Finding DHCP IP of guest system
by David Dyer-Bennet 19 Jul '10

19 Jul '10

If I can log in to the guest through the console, I can of course find out what IP DHCP has assigned it. If I configure a static IP I can of course connect to the system there (if it runs services, the firewall allows it, all the usual caveats). Does there happen to be any way to determine from dom0 what IPs are participating in the network and which guests they belong to? (I'm configuring everything as bridged; basically I want to use virtualization to pretend I have a bunch of independent systems visible to the outside.) (I suppose just what the IPs are is enough; the number is small enough I could probe them until I found the system I wanted. Obviously this is for use when I'm having trouble getting in through the console but have some reason to think the rest of the system is alive.) -- David Dyer-Bennet, dd-b(a)dd-b.net; http://dd-b.net/ Snapshots: http://dd-b.net/dd-b/SnapshotAlbum/data/ Photos: http://dd-b.net/photography/gallery/ Dragaera: http://dragaera.info

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Xen cpu requirements
by David Dyer-Bennet 19 Jul '10

19 Jul '10

I'm installing Centos 5.5 on a new Dell R301 server. I wanted to run Xen and have the full virtualization possibilities (this is our development support server, so it runs a few real services and is available for playing with things; putting the "playing with things" functions into virtual servers would protect the "few real services", and make it easier to clean up afterwards). I have enabled virtualization support in the BIOS. /proc/cpuinfo says I have model name : Intel(R) Xeon(R) CPU X3450 @ 2.67GHz and flags : fpu tsc msr pae cx8 apic mtrr cmov pat clflush acpi mmx fxsr sse sse2 ss ht syscall nx lm constant_tsc ida pni est ssse3 cx16 sse4_1 sse4_2 popcnt lahf_lm The "vmx" flag doesn't appear to be set. (I'm working from <http://www.centos.org/docs/5/html/Virtualization-en-US/ch-op-sys-support.ht…>, by the way; I note that document is from 2007 or maybe even 2006, so perhaps some things aren't fully up-to-date.) So, does that mean my Xeon-based server doesn't have hardware virtualization assistance? -- David Dyer-Bennet, dd-b(a)dd-b.net; http://dd-b.net/ Snapshots: http://dd-b.net/dd-b/SnapshotAlbum/data/ Photos: http://dd-b.net/photography/gallery/ Dragaera: http://dragaera.info

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Desktop Supercomputer
by Rajagopal Swaminathan 19 Jul '10

19 Jul '10

Greetings, Have been looking at the specs of Boston Venom T4000. Boston Venom T4000 http://www.bostonindia.in/products/bos-t4000.aspx I could not figure out the lowest base price points, HA features and KVM support Yet to work out the storage part of say 8TB storage (with HA features, of course) for this beast. and accessability issues from devices. I am in the middle of trying to find out about What AMD has been doing in its end. and Lastly, wireless fencing devices Yet to look into easy monitoring and management tools. Any opinions please? Regards, Rajagopal

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xm console -- what should I get?
by David Dyer-Bennet 19 Jul '10

19 Jul '10

If I type "xm console 6", say (when I have a virtual machine 6 running), what should I get? The documentation seems to indicate that I should get something that behaves like a telnet to a serial console. What I actually get is a connection that might show me a couple of lines of output that do look like they belonged on the console, but doesn't seem to accept any input (except that it does exit on the documented escape character ^[). These virtual systems show as running, and in fact with virt-viewer I can get a VNC console to them. Dom0 and the guests are Centos 5.5 x64, running on Intel processors with modern virtualization support (turned on in the bios, and it looks like Xen found it from xm dmesg output). -- David Dyer-Bennet, dd-b(a)dd-b.net; http://dd-b.net/ Snapshots: http://dd-b.net/dd-b/SnapshotAlbum/data/ Photos: http://dd-b.net/photography/gallery/ Dragaera: http://dragaera.info

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Discuss July 2010