[CentOS] qemu
How to use qemu with a network brdige The bridge should have dhcp Not nat ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] ESXi, KVM or Xen?
n...@li.nux.ro wrote: > > My subjective preference is similar. By now I'm running a dozen Centos > servers virtualized (xen), all I can say is "Centos5 + Xen = love" :-) > The darn thing runs out of the box very well; it's stable, it's fast, > tools and big community expertise available. > >> >> VMWare's offering seems to have the best support and tools, plus >> likely the most matured of the options. Also given their market >> dominance, unlikely to just up and die in the near future. > > Unlikely to die yes, possibly to just stop offering shit for free, yes > also. Unless you're a big enterprise looking for some serious corporate > backing, I wouldn't look at vmware, but that's just how I feel. You never know when any company is going to die, change directions, or be acquired by Oracle, but VMware has a fairly long history of providing increasingly better free offerings (better in that respect than RedHat...) so I would downplay the risk of it going away. The main issue with using ESXi is just that you need a windows box to run the client when you want to change configurations or access the guest consoles. And with the free version you have to use the converter program to copy images in or out (but the converter is very well done). -- Les Mikesell lesmikes...@gmail.com ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] text to html
my own solution: http://pastebin.com/raw.php?i=kqQXCpD5 > input: > http://pastebin.com/raw.php?i=MqPXZwc3 > > output: > http://pastebin.com/raw.php?i=8QCkp4yv > > it will be a long day.. :D > > could someone please help with it? > > i have to make a "one liner" that get's the input, and gives the > mentioned output. > ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] Limiting fuse-mounted NTFS drive access?
I have a CentOS 5.5 system that is dual-boot CentOS 5.5 and Windows XP w/SP3 formatted with NTFS (for the Windows partition, of course). I have installed fuse (ntfs-3g) to allow read/write access to the NTFS partition from CentOS. No regular user has sudo. What is the best way to limit the access a user logging into the CentOS from mangling or changing data in unwanted areas of the fuse-mounted NTFS partition? I presume this would be somewhere in /etc/fstab, but what should the mount line say for at least write limitations? Thanks. Scott ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] ESXi, KVM or Xen?
Hi, We went for Esxi, with Vmware essentials, cost about £300 for 3 hosts managed via vcenter, so far so good most vm's are CentOS 5.x Running NFS shared storage on RHEL Regards Keith On 3 Jul 2010, at 04:52, Emmanuel Noobadmin wrote: > Which of these would be the recommended virtualization platform for > mainly CentOS guest on CentOS host for running a virtualized mail > server? From what I've read, objectively it seems that VMWare's still > the way to go although I would had like to go with Xen or KVM just as > a matter of subjective preference. > > > VMWare's offering seems to have the best support and tools, plus > likely the most matured of the options. Also given their market > dominance, unlikely to just up and die in the near future. > > Xen would had been a possible option except Redhat appears to be > focusing on KVM as their virtualization platform of choice to compete > with VMWare and Citrix. So maybe Xen support will be killed shortly. > Plus the modified xen kernel apparently causes conflict with certain > software, at least based on previous incidents where I'd been advised > not to use the CentOS xen kernel if not using xen virtualization. > > > KVM would be ideal since it's opensource and would be supported in > CentOS as far as can be reasonably foreseen. However, looking at > available resources, it seems to have these key disadvantages > > 1. Poorer performance under load. > http://wiki.xensource.com/xenwiki/Open_Topics_For_Discussion?action=AttachFile&do=get&target=Quantitative+Comparison+of+Xen+and+KVM.pdf > This 2008 XenSummit paper indicates that it dies on heavy network load > as well as when there are more than a few VM doing heavy processing at > the same time. But that's two years ago and they weren't using > paravirtual drivers it seems. > > http://vmstudy.blogspot.com/2010/04/network-performance-test-xenkvm-vt-d.html > This blog testing out Xen/KVM pretty recently. While the loads are > not as drastic and neither the difference, it still shows that KVM > does lag behind by about 10%. > > This is a concern since I plan to put storage on the network and the > most heavy load the client has is basically the email server due to > the volume plus inline antivirus and anti-spam scanning to be done on > those emails. Admittedly, they won't be seeing as much emails as say a > webhost but most of their emails come with relatively large > attachments. > > > 2. Security > Some sites point out that KVM VM runs in userspace as threads. So a > compromised guest OS would then give intruder access to the system as > well as other VMs. > > Should I really be concerned or are these worries only for extreme > situations and that KVM is viable for normal production situations? > Are there other things I should be aware of? > ___ > 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] ESXi, KVM or Xen?
On 7/3/10, David McGuffey wrote: > As I understand it each VM under kvm has a different SELinux context. > Breaking into one VM doesn't give you the context to manipulate another. > One would have to go back out through the network to attack the next > VM...and if you have decent logging and IDS the noise should be > seen/detected. > > I went with kvm specifically because it is integrated into SELinux. In theory that sounds great and would had covered the security concern part. But my own experience with SELinux had basically been well less than positive. When I first knew about it 2 years ago on my first install of CentOS, it just made things really difficult and even when it worked, setroubleshootd ends up sucking up memory and lags the system, making it extremely difficult to even view the SE event log to try to figure out what happened. Maybe it's just my noobness then, so I'll give it another try with leaving SELinux enforcing instead of permissive. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] ESXi, KVM or Xen?
Hi, I'm running CentOS 5.5 under Xen, it works excellent, no problems. -- Regards, Samuel Paragreen. On 7/3/10, David McGuffey wrote: > > On Sat, 2010-07-03 at 11:52 +0800, Emmanuel Noobadmin wrote: >> 2. Security >> Some sites point out that KVM VM runs in userspace as threads. So a >> compromised guest OS would then give intruder access to the system as >> well as other VMs. >> >> Should I really be concerned or are these worries only for extreme >> situations and that KVM is viable for normal production situations? >> Are there other things I should be aware of? >> > As I understand it each VM under kvm has a different SELinux context. > Breaking into one VM doesn't give you the context to manipulate another. > One would have to go back out through the network to attack the next > VM...and if you have decent logging and IDS the noise should be > seen/detected. > > I went with kvm specifically because it is integrated into SELinux. > > Dave M > > > ___ > CentOS mailing list > CentOS@centos.org > http://lists.centos.org/mailman/listinfo/centos > -- -- Regards, Samuel Paragreen. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] text to html
On 07/03/2010 02:07 AM, Jozsi Avadkan wrote:
> input:
> http://pastebin.com/raw.php?i=MqPXZwc3
>
> output:
> http://pastebin.com/raw.php?i=8QCkp4yv
>
> it will be a long day.. :D
>
> could someone please help with it?
>
> i have to make a "one liner" that get's the input, and gives the
> mentioned output.
>
Why a 'one liner'? That sounds an awful lot like homework...But I'll
give you the benefit of the doubt. You can turn this Perl script into a
one liner easily. Or you can just save it as a script and use it like:
./convert-to-html.pl < input_data.txt
#!/usr/bin/perl
use strict;
use warnings;
my (%section_info, @section_list);
while() {
s/^\s+//s;
s/\s+$//;
next unless ($_ ne '');
s/&/\&/gs;
s//\>/gs;
s/"/\"/gs;
my ($dir,$file) = m#(^[^/]+)/(.+)$#;
$file =~ s/\.html$//i;
push(@{$section_info{$dir}}, "$file");
push(@section_list, $dir);
}
foreach my $section (@section_list) {
print "$section\n";
print join(" |\n", @{$section_info{$section}});
print "\n\n";
}
--
Benjamin Franz
___
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[CentOS] Help: Please help me size my server requirements
I am looking to build a Workgroup Server. (Should be compatible/certified with both XEN & VMware hypervisors, as I am not sure which one I will settle with...comments requested) To run baremetal on hypervisor, with each of the following services running virtualized with minimum OS install (CentOS 5.x, latest stable release). - Multi-homed router-cum-border firewall (Access to Network Card limited to this instance...will act as router for rest of virtual machines). - DNS Server (djbDNS). - Mail Server (Qmail). - News Server (INN). - Webserver (Apache). - RDBMS (postgreSQL...highest load). In addition to above the server to provide Windows RDP &/or Linux Desktop Thinclient to 5 users running diskless thin clients or old desktops (second highest load). Server to have adequate amount of memory for the above and 500 GB/1 TB RAID 5 or better using SATA disks. What Server Specs. I am looking at? I understand DB load is major in this but assuming moderate to medium db load, what do I need. Will seperate the server & Thinclient server six months/year down the road. What budget? Recommendations for a processor/motherboard/ram/disks/sata card? With best regards and thanks in advance. Sanjay Arora. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] kvm as non-root user
On Sat, 2010-07-03 at 07:58 -0400, David McGuffey wrote: > Yes, I already get that output. I also made sure that the xml scripts > and the VM images are not root:root, but root:kvm. > > I'm using the Virtual Machine Manager GUI as the interface...that is > where I get challenged for the root pw. Maybe I need to go to create a > script that runs qemu-kvm as the regular user to start the VMs. > > Dave M > > On Fri, 2010-07-02 at 18:09 +0530, Arun Khan wrote: > > On Fri, Jul 2, 2010 at 4:24 PM, David McGuffey > > wrote: > > > Tried as I might, I cannot get kvm on CentOS 5.4 to run as a non-root > > > user. > > > > Post the error message. > > > > > Have Googled and followed guidance I've found (put the regular > > > user in the kvm group, change permissions on several files, etc.). > > > > > > Anyone have decent (e.g., working) guidance on how to do this? > > > > The output of "ls -l /dev/kvm" should be like this: > > > > crw-rw+ 1 root kvm 10, 232 2010-07-02 09:27 /dev/kvm > > > > I have not had to do anything special as long as the non root user is > > member of "kvm" group. > > > > HTH > > -- Arun Khan > > In /usr/bin, here is what I find. -rwxr-xr-x 1 root root 9230 Apr 2 22:31 virt-clone -rwxr-xr-x 1 root root 10322 Apr 2 22:31 virt-convert -rwxr-xr-x 1 root root 12000 Apr 2 22:31 virt-image -rwxr-xr-x 1 root root 34482 Apr 2 22:31 virt-install lrwxrwxrwx 1 root root 20 May 16 22:34 virt-manager -> ../bin/consolehelper -rwxr-xr-x 1 root root 34040 Sep 3 2009 virt-viewer -rwxr-xr-x 1 root root 3505 Mar 31 05:02 virt-xml-validate And looking through the virsh manual, here is what I find: Most virsh commands require root privileges to run due to the communications channels used to talk to the hypervisor. Running as non root will return an error. Seems all paths to managing VMs has to go through root. Dave M ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] ESXi, KVM or Xen?
On Sat, 2010-07-03 at 11:52 +0800, Emmanuel Noobadmin wrote: > 2. Security > Some sites point out that KVM VM runs in userspace as threads. So a > compromised guest OS would then give intruder access to the system as > well as other VMs. > > Should I really be concerned or are these worries only for extreme > situations and that KVM is viable for normal production situations? > Are there other things I should be aware of? > As I understand it each VM under kvm has a different SELinux context. Breaking into one VM doesn't give you the context to manipulate another. One would have to go back out through the network to attack the next VM...and if you have decent logging and IDS the noise should be seen/detected. I went with kvm specifically because it is integrated into SELinux. Dave M ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] kvm as non-root user
Yes, I already get that output. I also made sure that the xml scripts and the VM images are not root:root, but root:kvm. I'm using the Virtual Machine Manager GUI as the interface...that is where I get challenged for the root pw. Maybe I need to go to create a script that runs qemu-kvm as the regular user to start the VMs. Dave M On Fri, 2010-07-02 at 18:09 +0530, Arun Khan wrote: > On Fri, Jul 2, 2010 at 4:24 PM, David McGuffey > wrote: > > Tried as I might, I cannot get kvm on CentOS 5.4 to run as a non-root > > user. > > Post the error message. > > > Have Googled and followed guidance I've found (put the regular > > user in the kvm group, change permissions on several files, etc.). > > > > Anyone have decent (e.g., working) guidance on how to do this? > > The output of "ls -l /dev/kvm" should be like this: > > crw-rw+ 1 root kvm 10, 232 2010-07-02 09:27 /dev/kvm > > I have not had to do anything special as long as the non root user is > member of "kvm" group. > > HTH > -- Arun Khan > ___ > 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] ESXi, KVM or Xen?
On Sat, Jul 03, 2010 at 11:52:41AM +0800, Emmanuel Noobadmin wrote: > Which of these would be the recommended virtualization platform for > mainly CentOS guest on CentOS host for running a virtualized mail > server? From what I've read, objectively it seems that VMWare's still > the way to go although I would had like to go with Xen or KVM just as > a matter of subjective preference. Also worth looking at Citrix XenServer. My essay on this from a few months ago: http://sweh.spuddy.org/Essays/Virtualization_options.html > VMWare's offering seems to have the best support and tools, plus Note that ESXi uses an embedded control node and is very limited in hardware support. > Xen would had been a possible option except Redhat appears to be I found the Xen in CentOS 5.4 to be unstable for Windows guests; it was fine for CentOS guests. > KVM would be ideal since it's opensource and would be supported in It seemed to work adequately, but the toolset isn't quite as user friendly (eg need to manually create bridges). -- rgds Stephen ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] text to html
post script: it's not often I actually run into something I can help with on this list. So just let me know if you need help writing that php script. Shouldn't take more than 15 minutes as long as you don't require design documentations ;) ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] text to html
On 7/3/10, Jozsi Avadkan wrote: > input: > http://pastebin.com/raw.php?i=MqPXZwc3 > > output: > http://pastebin.com/raw.php?i=8QCkp4yv > > it will be a long day.. :D > > could someone please help with it? > > i have to make a "one liner" that get's the input, and gives the > mentioned output. Definitely looks like a job for a script and personally I'll go with PHP due to familiarity. read line by line, explode the string on /, then section off based on the first token. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] text to html
Use php or some other html-friendly scripting language... Should be easy. - Jussi On 3.7.2010 12.07, Jozsi Avadkan wrote: > input: > http://pastebin.com/raw.php?i=MqPXZwc3 > > output: > http://pastebin.com/raw.php?i=8QCkp4yv > > it will be a long day.. :D > > could someone please help with it? > > i have to make a "one liner" that get's the input, and gives the > mentioned output. > > ___ > CentOS mailing list > CentOS@centos.org > http://lists.centos.org/mailman/listinfo/centos > -- Jussi Hirvi * Green Spot Topeliuksenkatu 15 C * 00250 Helsinki * Finland Tel. +358 9 493 981 * Mobile +358 40 771 2098 (only sms) jussi.hi...@greenspot.fi * http://www.greenspot.fi ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] text to html
input: http://pastebin.com/raw.php?i=MqPXZwc3 output: http://pastebin.com/raw.php?i=8QCkp4yv it will be a long day.. :D could someone please help with it? i have to make a "one liner" that get's the input, and gives the mentioned output. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
