date:20110719

Re: [CentOS-virt] CentOS-6.0 and LXC

2011-07-19 Thread Nenad Opsenica



Always Learning wrote:
 On Tue, 2011-07-19 at 08:22 +1000, Matt Paine wrote:

   
 As far as I am aware, KVM uses the cpu hardware to run completely
 different operating systems independently of the host.


 LXC is similar to Linux-VServer, or virtuozzo, where you are always
 running a base kernel, and can run multiple init's at the same time.

 ...
 

 Thank you for your explanation. It is most helpful. To summarise what I
 think is correct: One can run multiple LXC containers, each containing
 an identical version of the main host operating system but processes are
 separate from the others. KVM creates a type of 'container' allowing
 different host operating systems to run in that container.

 Can one run inside a LXC container a KVM ?

 Can one run inside a KVM some LXC containers ?

 Or is the simultaneous usage on the same machine of LXC and KVM mutually
 exclusive or incompatible ?

 Thank you again.
   
I have no experience with LXC, but I have been running Linux-Vserver 
inside KVM container, without any problem. I suppose that it is the same 
with LXC.

Running KVM inside LXC I haven't tried, but if it is possible I still 
think it is not such a good idea. Any disturbance in some of the LXCs 
will make problem to others (e.g. kernel driver crash will reflect on 
all LXCs and, therefore, all KVMs).

I think that running LXC/Linux-Vserver inside KVM machine is a great 
tool to light virtualize several small servers inside one large KVM.

Regards,

Nenad

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Re: [CentOS-virt] CentOS-6.0 and LXC

2011-07-19 Thread Matt Paine

Hi Paul. See my un-educated comments inline :)


On 19 July 2011 08:59, Always Learning cen...@u6.u22.net wrote:


 On Tue, 2011-07-19 at 08:22 +1000, Matt Paine wrote:

  As far as I am aware, KVM uses the cpu hardware to run completely
  different operating systems independently of the host.
 
 
  LXC is similar to Linux-VServer, or virtuozzo, where you are always
  running a base kernel, and can run multiple init's at the same time.
 
  ...

 Thank you for your explanation. It is most helpful. To summarise what I
 think is correct: One can run multiple LXC containers, each containing
 an identical version of the main host operating system but processes are
 separate from the others. KVM creates a type of 'container' allowing
 different host operating systems to run in that container.


If can try to clarify my understanding, LXC is process isolation. basically
the kernel is shared between the containers. (not specifically the entire
host operating system, just the kernel).

KVM will need to be explained by someone else, the only understanding I have
with this is it relies on virtualisation in the processor to switch between
os's. With the benifit being you can run M$Windows if you want to.

There is no way to run windows with LXC.


Can one run inside a LXC container a KVM ?


If the guest container have the correct privileges, then I would assume so.
But I would suggest this would be a messy way to do things, and breaks the
whole container concept. The processes in the container are ment to be
'contained' yet to get the correct kernel priveleges to do complete KVM
switching would be to open up the entire container to the rest of the system
(if thats even at all possible, it may not be! The kernel may not provide
the correct privileges to do KVM virtualisation within a LXC guest)


Can one run inside a KVM some LXC containers ?


This one I would say definitely. Since you are running a completely new
kernel, I cant see a reason why you couldn't provide an LXC kernel to run
within a KVM guest. But theres a bit of guessing here as well :)



 Or is the simultaneous usage on the same machine of LXC and KVM mutually
 exclusive or incompatible ?

 Thank you again.



 --
 With best regards,

 Paul.
 England,
 EU.


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Re: [CentOS-virt] CentOS-6.0 and LXC

2011-07-19 Thread SZ Quadri

On Tue, Jul 19, 2011 at 4:29 AM, Always Learning cen...@u6.u22.net wrote:


 On Tue, 2011-07-19 at 08:22 +1000, Matt Paine wrote:

  As far as I am aware, KVM uses the cpu hardware to run completely
  different operating systems independently of the host.
 
 
  LXC is similar to Linux-VServer, or virtuozzo, where you are always
  running a base kernel, and can run multiple init's at the same time.
 
  ...

 Thank you for your explanation. It is most helpful. To summarise what I
 think is correct: One can run multiple LXC containers, each containing
 an identical version of the main host operating system but processes are
 separate from the others. KVM creates a type of 'container' allowing
 different host operating systems to run in that container.

 Can one run inside a LXC container a KVM ?

 Can one run inside a KVM some LXC containers ?

 Or is the simultaneous usage on the same machine of LXC and KVM mutually
 exclusive or incompatible ?


It may not be exactly like LXC but you can also have a look a OpenVZ.
I have been using it on many servers for years with no problems. It is quite
lightweight and easy to use.
I think you can run OpenVZ inside KVM as well.

- SZ Quadri
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[CentOS-virt] qemu-kvm -snapshot

2011-07-19 Thread Andrea Chierici

Hi,
I am trying to benchmark disk I/O performance on VM running with 
-snapshot option enabled.
In order to do that I specify cache=none in the -drive parameter (yes I 
am running qemu-kvm at command line0.
The problem is that if I use this option kvm seems to ignore the 
cache=none directive and I get weird output from iozone (I/O values are 
better than on the real machine, indicating that caching is enabled). 
The same command line, without -snapshot gives a correct output.

Has anyone a clue about that? I succeeded in disabling cache in the past 
(with -snapshot enabled), but apparently this is not working anymore and 
I can't explain why.

If this can help, here is the command line I am using:

/usr/libexec/qemu-kvm  -m 2048 -smp 1 -name test-1 \
-boot c -drive 
file=/var/lib/libvirt/images/test-1.img,if=virtio,index=0,boot=on,cache=none 
\
-net nic,macaddr=54:52:00:37:a9:eb,model=virtio -net tap \
-vnc 127.0.0.1:10 -k en-us -snapshot 

the host is running centos5 and all latest updates are applied.

Cheers,

Andrea

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Re: [CentOS-virt] Suggestions to improve this minimal kickstart config for CentOS 6?

2011-07-19 Thread Kartik Subbarao


On 07/19/2011 12:36 PM, Kartik Subbarao wrote:
 rpm -e $(rpm -qa |grep -i firmware)

This should be changed to:
rpm -e $(rpm -qa | grep -i firmware | grep -v kernel-firmware)

Since apparently kernel depends on kernel-firmware.

-Kartik

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Re: [CentOS-virt] Suggestions to improve this minimal kickstart config for CentOS 6?

2011-07-19 Thread Manuel Wolfshant


On 07/20/2011 12:15 AM, Kartik Subbarao wrote:

On 07/19/2011 12:36 PM, Kartik Subbarao wrote:

rpm -e $(rpm -qa |grep -i firmware)

This should be changed to:
rpm -e $(rpm -qa | grep -i firmware | grep -v kernel-firmware)

Since apparently kernel depends on kernel-firmware.
Try the attached ks.  It installs around 180 packages. libselinux-utils 
is in because I find it mandatory to be able to modify the selinux 
configuration of an existing system.


There are a few packages left which can be removed if you insist:
- the firmware packages if you do not use that specific hardware ( 
atmel, brocade, qlogic ).
- yum-presto if you prefer to always download full rpm packages instead 
of deltas

- which, acl, attr


install
text
reboot
#cdrom
url --url http://wolfy/centos/os/x86_64/
lang en_US.UTF-8
keyboard us
skipx
network --device eth0 --bootproto dhcp
rootpw --iscrypted  $PUTYOURENCRYPTEDPASSWORDHERE
firewall --enabled
selinux --enforcing
authconfig --enableshadow --enablemd5
timezone Europe/Amsterdam
bootloader --location=mbr
# The following is the partition information you requested
# Note that any partitions you deleted are not expressed
# here so unless you clear all partitions first, this is
# not guaranteed to work
clearpart --all --initlabel
part /boot --fstype ext3 --size=250
part pv.2 --size=5000 --grow 
volgroup VolGroup00 --pesize=32768 pv.2
logvol / --fstype ext4 --name=LogVol00 --vgname=VolGroup00 --size=1024 --grow
logvol swap --fstype swap --name=LogVol01 --vgname=VolGroup00 --size=256 --grow 
--maxsize=512
repo --name=updates --baseurl=http://PATHTOAVALIDREPO

%packages --nobase --excludedocs
coreutils
yum
rpm
e2fsprogs
lvm2
grub
openssh-server
openssh-clients
dhclient
yum-presto
-atmel-firmware-1.3-7.el6.noarch
-b43-openfwwf-5.2-4.el6.noarch
-cronie-1.4.4-2.el6.i686
-cronie-anacron-1.4.4-2.el6.i686
-crontabs-1.10-32.1.el6.noarch
-ipw2100-firmware-1.3-11.el6.noarch
-ipw2200-firmware-3.1-4.el6.noarch
-ivtv-firmware-20080701-20.2.noarch
-iwl1000-firmware-128.50.3.1-1.1.el6.noarch
-iwl3945-firmware-15.32.2.9-4.el6.noarch
-iwl4965-firmware-228.61.2.24-2.1.el6.noarch
-iwl5000-firmware-8.24.2.12-3.el6.noarch
-iwl5150-firmware-8.24.2.2-1.el6.noarch
-iwl6000-firmware-9.176.4.1-2.el6.noarch
-iwl6050-firmware-9.201.4.1-2.el6.noarch
-libertas-usb8388-firmware-5.110.22.p23-3.1.el6.noarch
-xorg-x11-drv-ati-firmware
-mysql-libs-5.1.47-4.el6.i686
-postfix-2.6.6-2.el6.i686
-rt61pci-firmware-1.2-7.el6.noarch
-rt73usb-firmware-1.8-7.el6.noarch
-sudo-1.7.2p2-9.el6.i686
-sysstat-9.0.4-11.el6.i686
-yum-utils-1.1.26-11.el6.noarch
-zd1211-firmware-1.4-4.el6.noarch
-info
-system-config-firewall-base
%end
%post
%end
acl-2.2.49-4.el6.i686
aic94xx-firmware-30-2.el6.noarch
atmel-firmware-1.3-7.el6.noarch
attr-2.4.44-4.el6.i686
audit-2.0.4-1.el6.i686
audit-libs-2.0.4-1.el6.i686
authconfig-6.1.4-6.el6.i686
basesystem-10.0-4.el6.noarch
bash-4.1.2-3.el6.i686
bfa-firmware-2.1.2.1-2.el6.noarch
binutils-2.20.51.0.2-5.11.el6.i686
bzip2-1.0.5-6.1.el6.i686
bzip2-libs-1.0.5-6.1.el6.i686
ca-certificates-2010.63-3.el6.noarch
centos-release-6-0.el6.centos.2.i686
checkpolicy-2.0.22-1.el6.i686
chkconfig-1.3.47-1.el6.i686
coreutils-8.4-9.el6.i686
coreutils-libs-8.4-9.el6.i686
cpio-2.10-9.el6.i686
cracklib-2.8.16-2.el6.i686
cracklib-dicts-2.8.16-2.el6.i686
curl-7.19.7-16.el6.i686
cyrus-sasl-lib-2.1.23-8.el6.i686
dash-0.5.5.1-3.1.el6.i686
db4-4.7.25-16.el6.i686
db4-utils-4.7.25-16.el6.i686
dbus-glib-0.86-5.el6.i686
dbus-libs-1.2.24-3.el6.i686
device-mapper-1.02.53-8.el6.i686
device-mapper-event-1.02.53-8.el6.i686
device-mapper-event-libs-1.02.53-8.el6.i686
device-mapper-libs-1.02.53-8.el6.i686
dhclient-4.1.1-12.P1.el6.i686
diffutils-2.8.1-28.el6.i686
dracut-004-32.el6.noarch
dracut-kernel-004-32.el6.noarch
e2fsprogs-1.41.12-3.el6.i686
e2fsprogs-libs-1.41.12-3.el6.i686
efibootmgr-0.5.4-8.el6.i686
elfutils-libelf-0.148-1.el6.i686
ethtool-2.6.33-0.3.el6.i686
expat-2.0.1-9.1.el6.i686
file-libs-5.04-5.el6.i686
filesystem-2.4.30-2.1.el6.i686
findutils-4.4.2-6.el6.i686
fipscheck-1.2.0-4.1.el6.i686
fipscheck-lib-1.2.0-4.1.el6.i686
gamin-0.1.10-9.el6.i686
gawk-3.1.7-6.el6.i686
gdbm-1.8.0-36.el6.i686
glib2-2.22.5-5.el6.i686
glibc-2.12-1.7.el6.i686
glibc-common-2.12-1.7.el6.i686
gmp-4.3.1-7.el6.i686
gnupg2-2.0.14-4.el6.i686
gpgme-1.1.8-3.el6.i686
grep-2.6.3-2.el6.i686
grub-0.97-68.el6.i686
grubby-7.0.15-2.el6.i686
gzip-1.3.12-18.el6.i686
hwdata-0.233-1.el6.noarch
info-4.13a-8.el6.i686
initscripts-9.03.17-1.el6.centos.i686
iproute-2.6.32-10.el6.i686
iptables-1.4.7-3.el6.i686
iptables-ipv6-1.4.7-3.el6.i686
iputils-20071127-13.el6.i686
kbd-1.15-11.el6.i686
kbd-misc-1.15-11.el6.noarch
kernel-2.6.32-71.el6.i686
kernel-firmware-2.6.32-71.el6.noarch
keyutils-libs-1.4-1.el6.i686
krb5-libs-1.8.2-3.el6.i686
less-436-4.el6.i686
libacl-2.2.49-4.el6.i686
libattr-2.4.44-4.el6.i686
libblkid-2.17.2-6.el6.i686
libcap-2.16-5.2.el6.i686
libcap-ng-0.6.4-3.el6.i686
libcgroup-0.36.1-6.el6.i686
libcom_err-1.41.12-3.el6.i686
libcurl-7.19.7-16.el6.i686

Re: [CentOS-virt] Suggestions to improve this minimal kickstart config for CentOS 6?

2011-07-19 Thread Dennis Jacobfeuerborn

On 07/19/2011 11:36 PM, Manuel Wolfshant wrote:
 On 07/20/2011 12:15 AM, Kartik Subbarao wrote:
 On 07/19/2011 12:36 PM, Kartik Subbarao wrote:
 rpm -e $(rpm -qa |grep -i firmware)
 This should be changed to:
 rpm -e $(rpm -qa | grep -i firmware | grep -v kernel-firmware)

 Since apparently kernel depends on kernel-firmware.
 Try the attached ks. It installs around 180 packages. libselinux-utils is
 in because I find it mandatory to be able to modify the selinux
 configuration of an existing system.

 There are a few packages left which can be removed if you insist:
 - the firmware packages if you do not use that specific hardware ( atmel,
 brocade, qlogic ).
 - yum-presto if you prefer to always download full rpm packages instead of
 deltas
 - which, acl, attr

Interesting. I'm also experimenting with a minimal kickstart and without 
the system-config-firewall-base package I can no longer login. Apparently 
the login succeeds but I immediately get thrown back to the login prompt. 
As soon as I add that package everything is fine again.

Regards,
   Dennis
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Re: [CentOS] CentOS 6 - VM network bridge issue

2011-07-19 Thread James Hogarth

 I built a CentOS 6 machine to host several CentOS 6 guest servers. As all
guests will be Internet facing I set up the host with two bridged NICs and
assigned an Internet facing IP address to br0 and a local IP address to br1.

 Each guest was installed using br0 and br1 with virtio drivers.  On each I
assigned an Internet facing IP address to eth0 and a local IP address on
eth1.  So far so good.  I can access the guest servers from either IP
address as expected.  That is HTTP, SSH and SMTP servers on them are
accessible and do what they are supposed to do.

 Except...  Except from any location outside of my Comcast Cable Modem.  To
be clear, from any machine inside the modem to any address on the guests,
all works perfectly.  But outside the modem the guest apps either don't
receive packets or for some reason don't respond, and I've tired it from
four different locations.

 Using Wireshark on the guests I can see the packets arrive from the
outside sources, but no response is seen.  On accesses from inside I can see
both incoming and outgoing packets, as expected.

 I can ping the outside sources from the guests, yet pings from the outside
sources get no response from the guests.  All the outside sources get
responses when pinging the host.  I can ping the guests from any inside
machine.


Initial thought is a routing issue particularly with multiple NICs.

What does 'ip r s' reveal?
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Re: [CentOS] EL6, xinetd, and permissions. What am I missing?

2011-07-19 Thread John Doe

From: Benjamin Smith li...@benjamindsmith.com
Staging for a rollout of EL 6, and ran into a very strange permissions issue 
with xinetd that defies all (my) logic. 
It's a script called spfiled that we use for messaging between our server 
cluster servers. I'm trying to get it to run with least permissions 
necessary. Because it reads/writes files in conjunction with a web-based 
service, it runs as user apache. 
...
Jul 18 16:32:25 bender xinetd[17830]: Server /path/to/filed.php is not 
executable [file=/etc/xinetd.d/spfiled461] [line=11]
Jul 18 16:32:25 bender xinetd[17830]: Error parsing attribute server - 
DISABLING SERVICE [file=/etc/xinetd.d/spfiled461] [line=11]


The man page says of group: .This attribute is ineffective if the effective 
user ID of xinetd is not super-user and if the groups attribute is not set to 
’yes’
Xinetd running as root?
Tried with groups = yes?

JD

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Re: [CentOS] [SOLVED] CUPS LAN printing problem (from Vista)

2011-07-19 Thread Marc Deop

On Monday 18 July 2011 20:59:18 Keith Roberts wrote:
On Mon, 18 Jul 2011, Keith Roberts wrote:

To: CentOS mailing list centos@centos.org
From: Keith Roberts ke...@karsites.net
Subject: Re: [CentOS] CUPS LAN printing problem (from Vista)

On Mon, 18 Jul 2011, m.r...@5-cent.us wrote:

To: CentOS mailing list centos@centos.org
From: m.r...@5-cent.us
Subject: Re: [CentOS] CUPS LAN printing problem (from Vista)

Keith Roberts wrote:
I have my main machine running Centos 5.6, and it has a HP
Deskjet 810c printer physically attached to it. CUPSD
broadcasts in on my LAN as the default printer. I can print
to the default HP printer over the LAN, from a laptop
running Centos 5.6.

However, I do have problems trying to print to this
same printer over the LAN, from a laptop running
M$ Vista.

Has anyone been able to print from a machine running M$
Windoze Vista to their CUPS LAN printer running on Centos
5.x please. All I need to know is yes, this works, or no
it's not possible.
snip
Dunno 'bout 5.6, but 5.4, 5.5, sure. We had people doing that.

Thanks Mark - that's all I need to know.

If it works for 5.4/5 there's not reason for it not to work
on 5.6

Now I know it's possible to do, I will spend time on reading
the documentation and seeking a solution myself.

I'm not looking to be spoon fed three times daily - LOL!

OK, thanks again for confirming that Mark. I have it working
now fine. Here are the notes I've made for the next time I
have to reinstall Windoze Bista.

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