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how to monitor each VM's traffic?
by Rudi Ahlers 08 Aug '08

08 Aug '08

Hi all Can someone please tell me how to monitor each VM's traffic on a CentOS 5.2 server, running either Xen or OpenVZ? I need to bill my users for the traffic they use, and would like to have a traffic usage graph for each Xen / OpenVZ Virtual Machine on the server. Thanx :) -- Kind Regards Rudi Ahlers

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VMs won't power on
by Richard Fairfield 08 Aug '08

08 Aug '08

Hello - I have installed the VMware-server-1.0.5-80187.i386.rpm package on a CentOS 5.1 system. I then ran the vmware-config.pl program. I chose mostly default answer, except that I did not choose the NAT option; I saw no errors. I used the VMware Server Console to create a Red Hat Linux VM. I also copied an externally created VM into the '/var/lib/vmware/Virtual Machines/' directory. I cannot power-on either of these VMs. The VM's console is blank for several minutes, after which the following message appears in a pop-up window: Unable to change virtual machine power state: The "/usr/lib/vmware/bin/vmware-vmx" process did not start properly Try running "/usr/lib/vmware/bin/vmware-vmx /var/lib/vmware/Virtual Machines/Red Hat Linux/Red Hat Linux.vmx" from the command-line on the server.. I tried running it from the command line, as the message suggests. That just hangs forever. I don't see anything other than the above error message in the /var/log/vmlog/vmware-serverd.log file. I've tried rebooting, and uninstalling and reinstalling the VMware Server software. I even tried installing from tar file, instead of the RPM. Nothing changes. I'm completely stuck. Can anyone help me with this? Richard Fairfield | Applications Engineer Isilon Systems P +1-206-315-7500 F +1-206-315-7501 www.isilon.com D +1-206-777-7911 M +1-206-372-2776

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How many gusets can I run with Centos 5.2
by Götz Reinicke 04 Aug '08

04 Aug '08

Hi, how many gusets can I run with Centos 5.2? RH EL 5 is limeted to 4 guests while the advanced server is unlimeted. We like to migrate a couple of small physical servers and some test/development-systems to virtual systems. Thanks for any hints. Best regards Götz Reinicke -- Götz Reinicke IT-Koordinator Tel. +49 7141 969 420 Fax +49 7141 969 55 420 E-Mail goetz.reinicke(a)filmakademie.de Filmakademie Baden-Württemberg GmbH Mathildenstr. 20 71638 Ludwigsburg www.filmakademie.de Eintragung Amtsgericht Stuttgart HRB 205016 Vorsitzende des Aufsichtsrats: Prof. Dr. Claudia Hübner Staatsrätin für Demographischen Wandel und für Senioren im Staatsministerium Geschäftsführer: Prof. Thomas Schadt

4 3

Windows HVM VMs - speed needed...
by Stephen 20 Jul '08

20 Jul '08

Hi All, I was hoping to run a Windows 2003 server in production on Centos 5.2 however the performance isn't very good. The host is Centos 5.2 64 bit. I did some file transfers and I'm seeing about 12Mb/s on a Windows 2003 VM and about 8Mb/s on a Windows 2003 32 bit VM. Numbers are measured using the builtin Windows 2003 server networking monitor (Press Ctrl Alt Del in Windows and go to the Windows tab). The server is an IBM xServe about a year old and the VMs are running in LVM partitions. Switches are Cisco Gigabit. So the hardware for server performance and network performance are not a limiting factor - I understand that the results I'm seeing are typical without running paravirtualized drivers in Windows. Just wanted to ask what the options are to get things going faster. I believe the choices are:- - Pay the dollars for a RedHat subscription which includes paravitualized drives for Windows - Install the LGPL PV drivers (don't want to do this, these are production machines and even up to a few months ago I'm seeing reports of VM corruption in the list. It would appear that the LGPL PV drivers are not at production standard yet) - Pay for an alternative Xen distribution, such as Xen's commercial product. Can someone confirm, have I covered all the bases? Thanks Stephen

2 2

firewall best practice on dom-0
by Kai Schaetzl 20 Jul '08

20 Jul '08

I took over a custom firewall script from my older Suse machines to my Dom-Us and it works just fine. Doing the same for Dom-0 immediately killed all traffic for the VMs. As there was no need before I had been dropping everything on the FORWARD chain. After ACCEPTing all for FORWARD my VMs are happy again. What's best practice on Dom-0, what do you do? Can I restrict the forwarding, in which way? Kai -- Kai Schätzl, Berlin, Germany Get your web at Conactive Internet Services: http://www.conactive.com

3 4

shut off ipv6 in Xen vifs?
by Kai Schaetzl 20 Jul '08

20 Jul '08

How can I shut off the autoconfig for ipv6 in the virtual network devies/bridge, which happens although ipv6 is shut off for the machine? The only relevant thread I could find is this: http://lists.xensource.com/archives/html/xen-devel/2007-01/msg00005.html Kai -- Kai Schätzl, Berlin, Germany Get your web at Conactive Internet Services: http://www.conactive.com

1 0

xen 3.2
by Justin Lim 16 Jul '08

16 Jul '08

Any ideal when 3.2 xen will be avail for centos? Thanks!

4 4

Need kernel-debuginfo-2.6.9-67.0.20.EL.x86_64.rpm
by Jerry Amundson 15 Jul '08

15 Jul '08

Short story: Would it be possible to get kernel-debuginfo-2.6.9-67.0.20.EL.x86_64.rpm on di.c.o? I have a need to run crash on a 2.6.9-67.0.20.ELxenU xm dump-core. Long story: Two Dell 6950 (now called R905, 4 Dual-Core AMD Opteron 8200 series) heartbeat/drbd nodes running the stock CentOS 5.2 Dom0. The domU's are the only resources in heartbeat. Dom1 is a perfectly running, updated, CentOS 5.2 Apache/MySQL/Samba server (2.6.18-92.1.6.el5xen). It's xen config: name = "guinan" bootloader = "/usr/bin/pygrub" uuid = "8fa0ac9e-fe28-17f5-6a72-07f84b4daa24" memory = 4097 vcpus = 6 on_poweroff = "destroy" on_reboot = "restart" on_crash = "restart" vfb = [ "type=vnc,vncunused=1,keymap=en-us" ] disk = [ "phy:/dev/drbd1,xvda,w", "phy:/dev/drbd2,xvdb,w" ] vif = [ "mac=00:16:3e:68:16:5d,bridge=xenbr0", "bridge=xenbr1" ] Dom2 is a CentOS 4.6 software development and database server (2.6.9-67.0.20.ELxenU). Every so often, could be several hours or several days, it just hangs, locks up, becomes unresponsive. Nothing to the console. Nothing logged. When it gets to this point, the only recourse is an xm destroy. It's occurred with every combination of Dom0/DomU. The hardware of both servers checks out OK. The only sign of life, on Dom2's current Dom0, xentop shows CPU usage, and at a high percent, at that: xentop - 12:02:36 Xen 3.1.2-92.1.6.el5 2 domains: 2 running, 0 blocked, 0 paused, 0 crashed, 0 dying, 0 shutdown Mem: 16775712k total, 11629904k used, 5145808k free CPUs: 8 @ 2194MHz NAME STATE CPU(sec) CPU(%) MEM(k) MEM(%) MAXMEM(k) MAXMEM(%) VCPUS NETS NETTX(k) NETRX(k) VBDS VBD_OO VBD_RD VBD_WR SSID Domain-0 -----r 50891 1.5 901352 5.4 no limit n/a 8 4 17720114 18765713 0 0 0 0 0 monolith -----r 965342 599.2 10486632 62.5 10486784 62.5 6 2 332672635 30178285 2 0 15805538 60805435 0 I've experimented with various xen config's. Currently it's this: name = "monolith" uuid = "283746fa-c708-cfa0-f5df-cad6abea568e" memory = 10241 vcpus = 4 bootloader = "/usr/bin/pygrub" on_poweroff = "destroy" on_reboot = "restart" on_crash = "restart" vfb = [ "type=vnc,vncunused=1,keymap=en-us" ] disk = [ "phy:/dev/drbd3,xvda,w", "phy:/dev/drbd4,xvdb,w" ] vif = [ "mac=00:16:3e:08:8d:c3,bridge=xenbr0", "bridge=xenbr1" ] Previously, I'd tried adjusting memory, but the problem resurfaced. Currently, I've gone from 6 vcpus to the 4 shown above in the hopes that stabilizes it. I'm at wits end. I've committed these machines to production status, so this instability has everyone kind of on edge, and wanting to go back to bare metal... jerry -- "Your life is trite and jaded, boring and confiscated." - Twisted Sister

3 3

Any news about next kvm release for centos 5.2?
by carlopmart 11 Jul '08

11 Jul '08

Hi all, Which will be next stable release for CentOS 5.2?? Can i use on a production enviromment?? Thanks. -- CL Martinez carlopmart {at} gmail {d0t} com

3 2

VMWare - 5.2 Update - Kernel Best Practices
by John Thomas 30 Jun '08

30 Jun '08

Thanks for all the great stuff. Executive Summary: Kernel Parameters or Special Kernel for 5.2 on VMWare? More Details: Is it the best practice to use the specially compiled kernels (when available, typically here: http://people.centos.org/~tru/kernel-vm/5/RPMS/i386/ ) or are kernel parameters now able to achieve the same thing? This bug report: http://bugs.centos.org/view.php?id=2189 seems to suggest clocksource=pit and divider=10 will crash kernels and I did not see "it's fixed" in the release notes. Thanks again! -- Sincerely, John Thomas

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