Re: [CentOS] XEN or KVM - performance/stability/security?
Hi, KVM if used as it is will show very poor performance on CentOS5. To achieve better results you need to update kernel to at least 2.6.32 and compile newer versions of libvirt and qemu. On CentOS6 all is fine with KVM right out of the box. Never used XEN so cannot compare. Dmitry Cherkasov 2012/4/20 Rafał Radecki radecki.ra...@gmail.com: Hi all. I am currently building a small test cloud based on Eucalyptus 2.0.3 and CentOS 5.8 x64. I have a choice which hypervisor to use: KVM or XEN. KVM is the default in CentOS 6 but I have read also many good things (for example PV guest machines, isolation between Dom0 and DomU) about XEN. Key factors from my opint of view are: - stability (which one runs more smoothly on CentOS?) - performance (XEN PV/HVM(with or without pv drivers) vs KVM HVM(with or without pv drivers)) - security Could you share your experience in these areas? Best regards, Rafal Radecki. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS-virt] Problem with Centos 6.2 KVM
yum install qemu-kvm ?
Dmitry Cherkasov
2012/1/30 Rajagopal Swaminathan raju.rajs...@gmail.com:
Greetings,
Launching the virt-manager yeilds following error
Error polling connection 'qemu:///system': internal error Cannot find
suitable emulator for x86_64
Traceback (most recent call last):
File /usr/share/virt-manager/virtManager/engine.py, line 440, in _tick
conn.tick()
File /usr/share/virt-manager/virtManager/connection.py, line 1414, in tick
newNets, self.nets) = self._update_nets()
File /usr/share/virt-manager/virtManager/connection.py, line 1277,
in _update_nets
lookup_func, build_class)
File /usr/share/virt-manager/virtManager/connection.py, line 1209,
in _poll_helper
if not check_support():
File /usr/share/virt-manager/virtManager/connection.py, line 501,
in is_network_capable
virtinst.support.SUPPORT_CONN_NETWORK)
File /usr/lib/python2.6/site-packages/virtinst/support.py, line
574, in check_conn_support
return _check_support(conn, feature, conn)
File /usr/lib/python2.6/site-packages/virtinst/support.py, line
443, in _check_support
actual_drv_ver = _hv_ver(conn, uri)
File /usr/lib/python2.6/site-packages/virtinst/support.py, line
376, in _hv_ver
ret = cmd(*args)
File /usr/lib64/python2.6/site-packages/libvirt.py, line 2823, in
getVersion
if ret == -1: raise libvirtError ('virConnectGetVersion() failed',
conn=self)
libvirtError: internal error Cannot find suitable emulator for x86_64
yum list gives
Installed Packages
libvirt.x86_64 0.9.4-23.el6_2.4
@updates
libvirt-client.x86_64 0.9.4-23.el6_2.4
@updates
libvirt-python.x86_64 0.9.4-23.el6_2.4
@updates
Available Packages
libvirt-client.i686 0.9.4-23.el6_2.4
updates
any clues?
TIA
--
Regards,
Rajagopal
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Re: [CentOS] Users and ftp
2008/9/16 Bob Hoffman [EMAIL PROTECTED]: I have vsftp chrooted so that users can only come into their home directory. I have a few virtual hosts. I have the websites in the home directory of the intial user for each site. So the sites look like this. /home/user1/html /home/user2/html Using vsftp, I have set the default to chroot a user to their home directory. So user1 ftping in whill go right to his directory and not be able to go higher. My problem is adding a second user to be able to access the directory via ftp. In other words, user1 has a partner named user1a. I tried adding user1a in user1 group and not in user1 group...netiher worked. I tried adding user1a with no home directory and tried making their home directoy /home/user1 In all cases, ftp says 'cannot move to /home/user1' when trying to access with user1a. I am to the point it is time to forgo the security of chroot in vsftp to just add a second user. Any help appreciated. Just in case you don't find solution with vsftp you may try using pureftpd. It enables mapping ftp users to system users so you can create several ftp users mapped to single system user who is the owner of /home/user1 -- as I can guess this hits your target. P.S. I'm not experienced with vsftp, so there may probably exist a solution with this package as well. -- Dmitry Cherkasov ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
