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PHP5 on CentOS4.7?
by Rudi Ahlers 11 Dec '08

11 Dec '08

Hi all, Does anyone know if CentOS 4.7 will support PHP5 natively? I have searched centos.org site, but can't see anything related to this? -- Kind Regards Rudi Ahlers

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Watchdog process?
by Amos Shapira 11 Dec '08

11 Dec '08

Hello, Is there a generic built-in way on CentOS to overlook that a specific process is alive and re-spawn it (or just run a configured command) when it dies? I know how to script things so a parent will watch its child, but was wondering whether there is something more readily available instead of having to reinvent the wheel. The process must be controlled via a /etc/init.d/... script and should be stop-able (it runs in a primary/stand-by configuration), so use of "respawn" in inittab is not a solution. So far googl'ing for "watchdog" comes up with references about system watchdog - which will reboot the system if the kernel appears to be stuck. Thanks, --Amos

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Combining active-backup and round-robbin network bonding
by Timm Essigke 11 Dec '08

11 Dec '08

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I think my first mail was not processed because it was send before the confirmation mail. In case you receive this mail twice, I am sorry! - --------------------------------------------------------------------- Hi, I want to set up two servers as a active-active HA cluster. Both servers have four Gbit NICs. Besides an unmanaged Gbit switch for the cluster communication (connected with eth0) I have two managed Gbit switches to which the servers and the clients will be attached. My idea was to use the following setup: switch2------eth1--bond1-- | switch1------eth2 | | | bond0 | switch1------eth3 This is for server1. Server2 should have two links with switch2 and one with switch1 instead. Switch1 and switch2 have a 3x1GBit 802.3ad trunk as switch interconnect. bond0 should be balance-rr (mode 0) to have load balancing and fault tolerance on switch2. The primary use is to double the capacity of the Gbit link. bond1 should be active-passive (mode 1) with bond0 as primary interface. This should guarantee availability of server1 to the workstations attached to switch2 in case switch1 fails. Both modes work fine as long as I use ethX-devices. According to /proc/net/bonding/bond0 I can bring bond0 up (MII Status: up), but in /proc/net/bonding/bond1 I can not bring the slave interface bond0 up. The "Permantent HW addr" is 00:00:00:00:00:00 no matter if I specify a MAC in ifcfg-bond0 or not. ifconfig bond0 shows the MAC of eth1 as HWaddr and the device as "UP BROADCAST RUNNING SLAVE MASTER MULTICAST". I use ARP for link monitoring, because MII monitoring seemed not reliable with my hardware (Broadcom BCM5708 + Intel 82571EB NICs and 3com 3848 + 4500G switches) on CentOS 5.2 (2.6.18-92.1.18.el5xen). How can I activate bond0 to work in the way I intended? Is such a setup impossible (i.e. to enslave bond-interfaces)? Is there a different/better way of doing what I want? Thanks in advance! Timm -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iQEVAwUBSUFrVMGs9/GXBO2vAQJAfgf/ZrM74TXKoX7PdD54V9i7ly0UyBRsIsRB Z2Nwq3YuUCkmN2wXSUwIyrccs/PeZ+Lm3k7THhbUGIxHXjI6EdfeJYgy5FYuNsWG 6BpUUUmgMSz7vXQ5NIJO9UkNpXQmgsjNpv5I0jwSvMRI/9blY5CHQf0pbxWG5dm8 Wz/YnvxwXf3ilNreEu7hTZ3C/ohnnUh8BRY0rmE0YKJRReeqol2at6GQ4XoPDw6m tAayNhv9+mUA1TYYvy/sOPXH9na143NSr4A7lPXG4l8aeS/obSI2359oZZyzR1Br 2brmensyswU9FbAreRr5/GIsWQ3zdQOdLoV9uTkzn57fD147u/ZiGQ== =Wk+k -----END PGP SIGNATURE-----

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Upgrading to Centos 4.7 on HP DL580G5 caused problems
by Dr Les Oswald 11 Dec '08

11 Dec '08

As part of patching a cluster which has two DL580G5 login nodes ( 4X Intel 7300 DC cpus) & 24 HP DL160G5 compute nodes ( 2x Intel 5272 DC cpus) we encountered an issue that I would like to record: I upgraded both DL580s to Centos 4.7 via yum but only rebooted one initially- this node, previously bomb-proof, started to hang randomly with no obvious messages logged to help with diagnosis. In the dmessage output I found this sequence never seem before Uhhuh. NMI received for unknown reason 20. Dazed and confused, but trying to continue Do you have a strange power saving mode enabled? Uhhuh. NMI received for unknown reason 30. Dazed and confused, but trying to continue (repeated several times) Googling revealed many different scenarios with this boot error message, some suggesting a memory error - Oh Joy, these two machines have 64GB RAM each. I then changed grub.conf to boot to the previous kernel 2.6.9-67.0.15.ELsmp instead of the updated version of 2.6.9-78.0.5.ELsmp. The boot-time error messages immediately went away and so far the systems are reliable. Has anyone an explanation or confirmation that they have seen or overcome the above issue? I should mention that the DL160 compute nodes have not exhibited this behaviour at all. Les Oswald

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bind specific ip address to iscsi target
by carlopmart 11 Dec '08

11 Dec '08

Hi all, I have setup a centos5.2 server (full updated) to serve iscsi disks using scsi-target-utils package. This server has two network adapters, one for remote administration and another to serve iscsi disk. How can I bind iscsi target service to only one ip address?? Many thanks. -- CL Martinez carlopmart {at} gmail {d0t} com

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Miredo 1.1.5
by Robert Moskowitz 11 Dec '08

11 Dec '08

I found a src.rpm for 1.1.5-1 for fc8 (not rh8!). I was able to rebuild it on my Centos build system. The rpms are identified as 1.1.5-1.i386.rpm, no el5 or other identification was placed in the files. I don't see how to control this when you rebuild from an existing src.rpm. Interestingly the fc8 designation was lost. I also rebuild it on my fc10 system. It worked, and the rpms have fc10 in their names. Don't know how well they will work. I will be trying them over the next couple weeks. If anyone wants a copy, let me know....

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Iptables Question
by Joseph L. Casale 10 Dec '08

10 Dec '08

I have a squid proxy running transparently, so in my firewall script I run the following fairly early: iptables -A PREROUTING -t nat -i $LAN -p tcp -m multiport --dports 80,443 -j REDIRECT --to-port 3128 This is a multihomed server so after this change the masquerading was removed (as only web access on the lan side of this server was needed). I now need to masq cleanly one device so that it can bypass the squid proxy. As order is important, would it be correct to put the following _in front_ of the PREROUTING command above: iptables -A POSTROUTING -t nat -o $WAN -j MASQUERADE iptables -A FORWARD -i $LAN -o $WAN -m mac --mac-source <mac addr> -m state --state NEW,ESTABLISHED,RELATED -p tcp -m multiport --dports 443 -j ACCEPT iptables -A FORWARD -i $WAN -o $LAN -m state --state RELATED,ESTABLISHED -j ACCEPT Where is the best place to filter for the mac in this scenario? I am hoping anything w/o this mac will skip the whole masq setup and enter the PREROUTING command below, resulting in the traffic being proxied through squid. Thanks! jlc

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Fedora 9 domU on CentOS 5.2 dom0 - very unstable?
by Dirk H. Schulz 10 Dec '08

10 Dec '08

I am running a Fedora 9 domU on CentOS 5.2 dom0, and it is quite unreliable. Every few days I have the following phenomenon: - many applications do not work at all (e. g. Nagios 3.05 stops checking, but the cgis work perfectly, the web server works as well) - system processes run into time outs (e. g. logging in via ssh runs into timeouts <<"connection reset by peer">> after many seconds, logging into the console does not get finished ever, no error, no refusal) and similiar All I can do then is destroy the domain (xm shutdown does not lead to anything either). Is this a known phenomenon? Is there any way to work around it? I do not have these problems with CentOS 5.2 domUs on the same machine (at least not that massive). Every hint or help is appreciated. Dirk

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Cannot mount samba shares
by Ralph Angenendt 10 Dec '08

10 Dec '08

Hi, quick(?) question: Has anybody seen that problem below? More important question: Did anybody solve that? This is my smb.conf (well, only the most important parts): [global] workgroup = FOOBAR server string = My Server map to guest = Bad User preferred master = No local master = No domain master = No dns proxy = No [on3] comment = Audio-Video-Imports path = /local/mir/import/on3 force group = users read only = No create mask = 0664 directory mask = 0775 guest ok = Yes The path has: drwxrwxr-x 3 mir users 4096 10. Dez 16:35 /local/mir/import/on3/ Meaning: group users and user mir are allowed to write in there. Works fine from windows clients. Guest user gets mapped to "nobody". Doesn't work from linux: [root@shutdown ~]# mount -t cifs -o user=nobody,guest //mir-qs/on3 /mnt/tmp/ mount error 13 = Permission denied Refer to the mount.cifs(8) manual page (e.g.man mount.cifs) root@mir-qs:~# uname -a ; rpm -q samba Linux mir-qs.br.de 2.6.9-78.0.8.ELsmp #1 SMP Wed Nov 19 20:05:04 EST 2008 i686 i686 i386 GNU/Linux samba-3.0.28-0.el4.9.i386 Machine is up to date. Error message on the server is make_connection: connection to on3 denied due to security descriptor. Googling around led me to the belief that someone fooled around with srvmgr.exe from a windows machine and that I should remove /var/cache/samba/share_info.tdb and restart samba. Which doesn't work. Now if I take out the "force group = users" everything works as expected. Except that I cannot write in this share - nobody isn't in the group users. I don't want to add nobody to the group users, nor can I go and change anything on that server regarding users and groups in the file system. Ah yes, smbclient works fine, but I really do not want to use that either. Cheers, Ralph

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What is Judy?
by Robert Moskowitz 10 Dec '08

10 Dec '08

I am trying to build Miredo 1.1.5 (http://www.remlab.net/miredo/devel.shtml.en) I have followed the rpmbuild instructions from: http://www.owlriver.com/tips/non-root/, and have the miredo source in ~/build/miredo-1.1.5. I run ./configure (as the INSTALL text file tells me to do) and get the error: checking for Judy.h usablity... no checking for Judy.h presence... no checking for Judy.h... no configure: WARING: If you don't care about scalability, re-run configure with ' --without-Judy'. configure: error: Required Judy dynamic arrays library missing.

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