The Xenapi Admin Tools are starting to become so useful that I don't like having XCP hosts without them. Currently you can go to http://xenapi-admin-project.github.com/xenapi-admin-tools/ and download the archive onto your host, extract it and then copy the tools to your PATH. This however, is a lot of work since they get updated often. In the coming weeks (months?) I'll be finishing the Yum repo for Xenapi Admin Tools so the XCP package manager can keep them up to date. Until I get that accomplished however it may be easier to just install git and clone the github repository. Every time you want to get updates you'd just cd into the xenapi-admin-tools directory and run git pull.
With that in mind we have to add the EPEL repository where git is housed in order to use Yum to install it.
rpm -ivh http://mirror.itc.virginia.edu/fedora-epel/5/i386/epel-release-5-4.noarch.rpm
yum install git
The EPEL repository is enabled by default so we didn't have to do anything special to install git. However, you may not want it enabled all the time because packages that EPEL hosts may replace XCP specific packages and mess up your system
sed -i 's/enabled=1/enabled=0/g' /etc/yum.repos.d/epel.repo
On occasion you may want to have access to a VM's Virtual Disk Image from the Control Domain (or another VM). An example of this would be access files in a VM disk that due to corruption will no longer boot. An XCP local Storage Repository is created from an LVM Volume Group. Each Virtual Disk Image represents one Logical Volume. However, mounting the Logical Volume directly isn't possible because there's VHD (Virtual Hard Drive) container inside the Logical Volume. Inside the VHD is the real VM disk's partitions. The hierarchy goes something like this Control Domain Volume Group -> Control Domain Logical Volume -> VHD Container -> VM disk -> VM disk physical Volume -> VM Disk Volume Group -> VM Disk Logical Volume -> VM Disk filesystem. You can see there's quite a few layers here but mounting the VM's disk filesystem IS possible. Here's how.
Since the Control Domain is really a VM itself (privileged VM) we can create a Virtual Block Device using the VM's Virtual Disk Image. From there we use kpartx to map the partitions to Control Domain device nodes.
1. Finding VDI UUID number
[root@testcloud1 ~]# xe vbd-list uuid ( RO) : b68a332b-4155-f1c4-b224-18fb465dc8e4 vm-uuid ( RO): fec94868-0449-3616-39b9-08c3b27dab70 vm-name-label ( RO): Fedora17 vdi-uuid ( RO): 199619f0-e483-4618-bbd4-bdc9c524bde1 empty ( RO): false device ( RO):
2. Finding the Control Domain UUID number
[root@testcloud1 ~]# xe vm-list is-control-domain=true uuid ( RO) : 2dfc3f33-4afa-47dd-8af6-21877326f8e4 name-label ( RW): Control domain on host: testcloud1 power-state ( RO): running
3. Creating a virtual block device for the VDI on our Control Domain. This returns the VBD UUID.
[root@testcloud1 ~]# xe vbd-create device=autodetect vm-uuid=2dfc3f33-4afa-47dd-8af6-21877326f8e4 vdi-uuid=199619f0-e483-4618-bbd4-bdc9c524bde1 11740055-f8d4-3d84-1f90-fb1f4b646fd6
4. Plugging in the Virtual Block Device gives us a /dev/sm/backend/<sr-uuid>/<vdi-uuid> device which fdisk will list.
[root@testcloud1 ~]# xe vbd-plug uuid=11740055-f8d4-3d84-1f90-fb1f4b646fd6
5. Showing the VBD attached to the control domain AND to the Fedora17 VM
[root@testcloud1 ~]# xe vbd-list uuid ( RO) : b68a332b-4155-f1c4-b224-18fb465dc8e4 vm-uuid ( RO): fec94868-0449-3616-39b9-08c3b27dab70 vm-name-label ( RO): Fedora17 vdi-uuid ( RO): 199619f0-e483-4618-bbd4-bdc9c524bde1 empty ( RO): false device ( RO): uuid ( RO) : 11740055-f8d4-3d84-1f90-fb1f4b646fd6 vm-uuid ( RO): 2dfc3f33-4afa-47dd-8af6-21877326f8e4 vm-name-label ( RO): Control domain on host: testcloud1 vdi-uuid ( RO): 199619f0-e483-4618-bbd4-bdc9c524bde1 empty ( RO): false device ( RO): sm/backend/ec2eb4df-040c-2a75-1c9f-69b953ac9e8d/199619f0-e483-4618-bbd4-bdc9c524bde1
6. Showing the Device Node using ls and fdisk
[root@testcloud1 ~]# ls -l /dev/sm/backend/ec2eb4df-040c-2a75-1c9f-69b953ac9e8d/199619f0-e483-4618-bbd4-bdc9c524bde1 brw------- 1 root root 253, 0 Jan 12 00:52 /dev/sm/backend/ec2eb4df-040c-2a75-1c9f-69b953ac9e8d/199619f0-e483-4618-bbd4-bdc9c524bde1
[root@testcloud1 ~]# fdisk -l $(ls /dev/sm/backend/ec2eb4df-040c-2a75-1c9f-69b953ac9e8d/199619f0-e483-4618-bbd4-bdc9c524bde1) Disk /dev/sm/backend/ec2eb4df-040c-2a75-1c9f-69b953ac9e8d/199619f0-e483-4618-bbd4-bdc9c524bde1: 8589 MB, 8589934592 bytes 255 heads, 63 sectors/track, 1044 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sm/backend/ec2eb4df-040c-2a75-1c9f-69b953ac9e8d/199619f0-e483-4618-bbd4-bd * 1 980 7863296 83 Linux Partition 1 does not end on cylinder boundary. /dev/sm/backend/ec2eb4df-040c-2a75-1c9f-69b953ac9e8d/199619f0-e483-4618-bbd4-bd 980 1045 524288 82 Linux swap / Solaris [root@testcloud1 ~]# kpartx -a $(ls /dev/sm/backend/ec2eb4df-040c-2a75-1c9f-69b953ac9e8d/199619f0-e483-4618-bbd4-bdc9c524bde1) [root@testcloud1 ~]# ls /dev/mapper/ 199619f0-e483-4618-bbd4-bdc9c524bde1p1 199619f0-e483-4618-bbd4-bdc9c524bde1p2 control VG_XenStorage--ec2eb4df--040c--2a75--1c9f--69b953ac9e8d-MGT VG_XenStorage--ec2eb4df--040c--2a75--1c9f--69b953ac9e8d-VHD--199619f0--e483--4618--bbd4--bdc9c524bde1 VG_XenStorage--ec2eb4df--040c--2a75--1c9f--69b953ac9e8d-VHD--6c663b1b--d9c4--45bd--9071--3f6b4668d164
7. Use kpartx to create /dev/mapper entries for each partition.
[root@testcloud1 ~]# kpartx -a $(ls /dev/sm/backend/ec2eb4df-040c-2a75-1c9f-69b953ac9e8d/199619f0-e483-4618-bbd4-bdc9c524bde1)
8. kpartx creates /dev/mapper nodes
[root@testcloud1 ~]# ls /dev/mapper/ 199619f0-e483-4618-bbd4-bdc9c524bde1p1 199619f0-e483-4618-bbd4-bdc9c524bde1p2 control VG_XenStorage--ec2eb4df--040c--2a75--1c9f--69b953ac9e8d-MGT VG_XenStorage--ec2eb4df--040c--2a75--1c9f--69b953ac9e8d-VHD--199619f0--e483--4618--bbd4--bdc9c524bde1 VG_XenStorage--ec2eb4df--040c--2a75--1c9f--69b953ac9e8d-VHD--6c663b1b--d9c4--45bd--9071--3f6b4668d164
9. Mount the partitions
[root@testcloud1 ~]# mount /dev/mapper/199619f0-e483-4618-bbd4-bdc9c524bde1p1 /media/Fedora17-rootfs/
[root@testcloud1 ~]# ls /media/Fedora17-rootfs/ bin boot dev etc home lib lib64 lost+found media mnt opt proc root run sbin srv sys tmp usr var
Notes: Be careful with mounting VDI's from VMs on the Control Domain. Best practice is to make sure that the VDI is not accessible from the Control Domain AND the VM at the same time. Mounting to two locations at once is a great way of corrupting your disk by having two different Operating Systems writing to the disk at the same time.
This is based on advice from Drazenko Djuricic as a response to Linus Torvald's questions on Gnome3.
What I did is to get dconf-editor (I use Ubuntu 12.04; so this is in package dconf-tools ... Chances are the package name is something similar on Fedora?) and then do the following changes to Gnome 3: And in there I disabled / changed:
org > gnome > shell > overrides
button-layout: :minimize,maximize,close
dynamic-workspaces: (deactivated)
edge-tiling: (deactivated)
workspace-only-on-primary: (deactivated)
And then I got myself cairo-dock and there I told the switcher applet how many static workspaces I want. Worked for me.
For font sizes: You need to get gnome-tweak-tool. It does have a setting where it can tweak the fonts and make them smaller. Also the Text scaling factor setting may help there.
As for extensions: I'd recommend these:
- Alternative Status Menu: gives you a "Shutdown" command in the status menu without having to press any extra keys
-"Axe Menu": Gives you a Gnome 2.x style application menu in the upper left corner, just where it used to be for Gnome 2.x
- Drive Menu: Let's you unmount/eject stuff via an "Eject" icon in the upper panel
- Windows Navigator: Let's you use the keyboard when Alt-Tabbing between windows ... I find this useful.
- Workspace Navigator: Let's you use the cursor keys in the Activities overview; this way you're waaaaay faster and switching between desktops is much less of a hassle. I personally find this useful and fail to see why it's not there by default ... Oh well.
I've started the process of making Xenapi Admin Tools XCP 1.6 compliant. I haven't found too many things I've had to change but XCP referrs to a few parameters differently.
For instance the software-version map parameter has changed the product_brand item to platform_name. The item product_version has been changed to platform_version.
XCP 1.1 | XCP 1.6 |
product_brand | platform_name |
product_version | platform_version |
Neither of these changes are major and I believe they were made to make XCP more compatible with Xenserver (or at least bring their code into sync) but my lshosts command would bring up nothing for both of those columns. This has been fixed and backwards compatibility has been maintained with XCP 1.1.
Citrix has an opening for a Xen Evangelist. From their blog:
"The Xen Open Source Evangelist will be an advocate for Xen.org projects (Xen, Xen Cloud Platform and Xen ARM) and be primarily engaged with open source Xen users, upstream and downstream projects of Xen as well as developers of Xen.org projects. In addition the Open Source Xen Evangelist will be responsible for representing Citrix and explaining their products and services in the appropriate venues."
It goes on to say that the person would demo and speak at key events around the world, communicate with the community, educate people on Xen and encourage the community to contribute to Xen. Sounds like an interesting opportunity. For more information apply at the Citrix site.
Prerequisites
Software
If you're using Windows you need to download Unetbootin. Most Linux distributions include it in their repositories so you can install it using the standard Linux package managers (yum, apt-get, zypper,synaptic etc.). You will also need to download the Xenserver installation CD and save it.
Setting up the USB thumb drive
The USB thumbdrive has to have a partition on it and it has to be formatted as FAT32.
Installing XCP/Xenserver on the thumbdrive
Fixing the thumbdrive so it will boot properly
The isolinux is used to boot ISO9660 disks like cdroms. We need to change the config so it uses syslinux which is used to boot hard disks.
cd into your mounted thumbdrive and copy/paste the following commands
mv boot/isolinux/isolinux.cfg boot/isolinux/syslinux.cfg mv boot/isolinux boot/syslinux mv syslinux.cfg syslinux.cfg.bak
You're done. Insert the thumbdrive into your future XCP/Xenserver host and reboot. You may need to go into the BIOS to change the boot order so it will boot from a USB device.
Notes:
A common error is getting the dreaded mboot.c32: not a COM32R image message. This seems to be because on some versions of the XCP install media the mboot.c32 file is not quite right. The last time I had to fix this I created a Xenserver 6.2 USB thumbdrive (which worked) and copied the /boot/syslinux/mboot.c32 file from there into my XCP 1.1 USB thumbdrive (which got the error listed above). Copy the good mboot.c32 file to the USB thumbdrive's /boot/syslinux folder. This solved the problem for me and so far I've only had it with XCP 1.1.
Xenserver 6.2 - 6.5 doesn't seem to have the problem listed above.
Update: I bought a Nokia n9 with MeeGo on it and have been using it for the last year. The gesture based interface is nice, the screen is gorgeous and the OS overall works very well although I think it was probably pushed out the door too early as it's not as rock solid stable as the n900 was. It's even more vertical oriented like a phone should be and doesn't have a keyboard which is an issue for me. My two biggest issues with it have been the lack of keyboard and a bug in the system that keeps it from recognizing when the headphones are plugged in or not. Someone made a app that hacks the state of the headphone jack so I can go back and forth between music and phone. Although the n9 is fairly well built it's not to the same tank quality that the n900 was. In one year of use (and unknown bumps) the camera stopped working. The n900 went through several years of severe abuse before something broke.
Update: The Jola Other Half went on sale in late fall of 2013 in Finland. They opened up sales to the rest of Europe in January so I had my daughter who lives in Paris order me one which she then sent on to me in the US. So now I have a Jola Other Half running SailfishOS. I'll be doing a article on my impressions later but just for a quick teaser I'll say this - the quality of the phone is nowhere near Nokia level as it's made by a Chinese company and is fairly generic. The back of the Other Half is 3d printed and way to slick to use in daily life but I'm covering it with something to make it grippier. SailfishOS is not quite ready for primetime but I think it has amazing potential.
I love Grocery Outlet and their signs. It's been a while since I've posted anything they've created so this should satisfy your desire. One other time the posted a sign showing it was cheaper to go to another store than to buy the item from them. I don't know what was going through the person's head when they posted it but it got put up anyway.
This is a calendar of events for a particular store... OK, it's the Lynnwood Grocery Outlet. I'm sure it's just a typo but I couldn't leave it alone because it's so funny.
In the brown box on the right hand side of the calendar is Coffee and Dognut day. If you have an insatiable appetite for dog nuts be sure to show up at Lynnwood Grocery Outlet any Thursday morning. That's once a week or every seven day which to be honest is about as long as I can go without dognuts. By about Wednesday night my craving for Dognuts is damn near uncontrollable. I'm frothing at the mouth about Tuesday night and by Wednesday I'm going into withdrawals. Poor dogs, it's sad.
If you however, have a craving for doughnuts you may want to check out your local doughnut store. I imagine you'd be able to find one listed under donuts as well.
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.image{padding:1em .5em;text-align:center}.repo .image .border-wrap{background-color:#fff;border:1px solid #999;line-height:0;display:inline-block}.repo .image img{border:1px solid #fff;background:url(https://a248.e.akamai.net/assets.github.com/images/modules/commit/trans_bg.gif?58c85417)}' }, options); // Extension Hashes _this.extensions = { as : 'actionscript', coffee : 'coffeescript', css : 'css', html : 'html', js : 'javascript', md : 'markdown', php : 'php', py : 'python', rb : 'ruby', }; // Repo _this.repo = { name : 'default', folders : [], files : [] }; // Namespace _this.namespace = _this.settings.name.toLowerCase(); // Insert CSS if(typeof _this.settings.css != 'undefined' && _this.settings.css !== '' && $('#repojs_css').length <= 0) $('body').prepend($('
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