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| − | {{Version|UCC=1.0}} | + | {{Version|UCS=3.2}} |
| − | {{Cool Solutions Disclaimer}} | + | {{Version|UCC=1.0}} |
| | + | {{Cool Solutions Disclaimer|Repository=no}} |
| | + | {{Out of Maintenance|Current ThinClients have more than 1GB Memory. This article won't be updated anymore.}} |
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| − | = Introduction = | + | == Archive == |
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| − | Thin Clients may have smaller storage devices (i.e. Compact Flash or onboard Flash) than the default 1,2G of the UCC default image.
| + | There is a version of this article for [http://wiki.univention.com/index.php?title=Cool_Solution_-_XenApp/XenDesktop_on_Thinclient_with_only_1GB_Flash&oldid=12541 UCS 3.2 & UCC 1.0]. |
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| − | This is an example for a thin client image for 1GB Flash supporting XenApp.
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| − | The configuration file, tested on a HP t5745(1GB), can be found at the bottom of this article.
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| − | | |
| − | == Software packages required ==
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| − | Here we are going to create a small UCC Thin Client image targeting full Citrix support, tested in a HP t5745 with 1GB flash storage.
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| − | In a typical deployment, some of our customers often require these features in order of priority:
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| − | * XenApp Session (+Firefox), including german localisation
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| − | * Typical ressoures: Sound, Flash, HDX
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| − | * if possible special enhancements: truecrypt
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| − | * if also possible RDP session as a fallback
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| − | | |
| − | == General procedure ==
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| − | For this we are going to need two diferent approaches, first we will use the ucc-image utility to build an image with an edited configuration file, and second we manually will install the packages left from the previous step.
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| − | = Step 1 - Configuration File =
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| − | This file is based on the official file for a thin client
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| − | /usr/share/doc/ucc-image-toolkit/example/ucc-thinclient.cfg
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| − | Please read [http://docs.univention.de/ucc-manual-1.0.html#imagegen:chapter UCC Manual Generation of adapted images].
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| − | The official images are also explained [http://wiki.univention.de/index.php?title=Building_UCC_images here]
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| − | Another configuration file to generate a <1GB image [http://wiki.univention.de/index.php?title=Configuration_file_for_a_reduced-sized_thin_client]
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| − | The image size is set at 790MB:
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| − | # Image size in GB
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| − | size: 0.794
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| − | | |
| − | == Important packages ==
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| − | A graphical system is still installed, but without desktop manager:
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| − | packages_no_recommends:
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| − | univention-lightdm (Integration of lightDM login manager into UCC)
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| − | indicator-session (Session management, status and user switching)
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| − | indicator-power (Power state)
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| − | X window system (and input drivers)<br>
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| − | xserver-xorg
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| − | xserver-xorg-input-mouse
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| − | xserver-xorg-input-kbd
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| − | Drivers for some video card families
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| − | xserver-xorg-video-ati
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| − | xserver-xorg-video-intel
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| − | xserver-xorg-video-vesa
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| − | Audio server:
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| − | pulseaudio
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| − | Tools: (no sessions are installed in this step)
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| − | openssh-server (Remote secure shell (SSH) server)
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| − | language-pack-de
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| − | ntpdate (client for NTP time servers)
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| − | Integration with the UCC domain, always required:
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| − | univention-ucc-theme (Univention theme)
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| − | univention-corporate-client (Metapackage for client systems)
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| − | This packages will be installed :
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| − | # Kernel
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| − | linux-image-generic (Linux kernel image)
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| − | # Grub
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| − | univention-ucc-grub (Grub2 configuration)
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| − | == Partition scheme == | |
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| − | /boot is set to 45MB. This is usually enough for one kernel, meaning that kernel updates should be performed by generating the image once again.<br>
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| − | partition2_name: boot
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| − | partition2_size: 45
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| − | partition2_fs: ext4
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| − | partition2_mountpoint: /boot
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| − | <br> The slash partition (/) will take all the available space.
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| − | partition3_name: root
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| − | partition3_size: expand
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| − | partition3_fs: ext4
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| − | partition3_mountpoint: /
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| − | The GPT would start at 2MB for alignment, and it will use 10MB of space. No "swap" partition is considered.
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| − | Now, after calling ucc-image -c thinclient-image-1G.cfg we will get the initial image
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| − | | |
| − | let's say in /tmp/tmprUgkUj/ucc-1.0-rev2-thinclient-image-1G.img*
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| − | | |
| − | = 2 Step - Manual installation of extra packages =
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| − | The idea is to first free some space in used by apt-get and then temporarily mount additional disks so we get enough cache for packages.
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| − | That is to delete the cache of packages in
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| − | var/cache/apt/ (be sure the 'archives/partial' directory is there)
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| − | and the lists in
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| − | /var/lib/apt/lists/ (there should remain a 'partial directory in here' as well)
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| − | for that we will create two temporary filesystems
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| − | dd if=/dev/zero of=/tmp/cache-apt bs=1M count=500 && mkfs.ext4 -F /tmp/cache-apt
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| − | dd if=/dev/zero of=/tmp/apt-lists bs=1M count=500 && mkfs.ext4 -F /tmp/apt-lists
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| − | Now they can be mounted
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| − | First let us mount the image in /mnt/img/
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| − | mkdir /mnt/img
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| − | mount -o loop /tmp/tmprUgkUj/ucc-1.0-rev2-thinclient-image-1G.img /mnt/img/
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| − | and free some space:
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| − | apt-get clean
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| − | rm /var/lib/apt/lists/appcenter*
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| − | rm /var/lib/apt/lists/univention*
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| − | Second, let us mount the extra filesystems
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| − | mount -o loop /tmp/cache-apt /mnt/img/var/cache/apt/
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| − | mkdir -p /mnt/img/var/cache/apt/archives/partial
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| − | mount -o loop /tmp/apt-lists /mnt/img/var/lib/apt/lists/
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| − | mkdir /mnt/img/var/lib/apt/lists/partial
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| − | with all ready, we can go into the image
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| − | chroot /mnt/img/
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| − | Once inside we can install xenapp session (~200MB in this case)
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| − | apt-get install --no-install-recommends univention-ucc-session-xenapp
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| − | apt-get clean
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| − | Now the image is full
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| − | sync
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| − | exit
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| − |
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| − | umount /mnt/img/var/cache/apt/
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| − | umount /mnt/img/var/lib/apt/lists/
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| − | umoun /mnt/img
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| − | Thanks to the 50MB buffer that the image has other utilities as flash player, the xen package can later be added for the user itself. This is also necesary since the user has to agree with the respective licenses of these programs.
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| − | | |
| − | = Further Info =
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| − | *794MB image configuration file
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| − | *[[Configuration_file_for_a_reduced-sized_thin_client]]
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| − | | |
| − | *[[Building_UCC_images]]
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| − | *[http://docs.univention.de/ucc-manual-1.0.html#imagegen:chapter UCC 1.0 Manual - Chapter 8 Generation of adapted UCC images ]
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| − | *[http://wiki.univention.de/index.php?title=UCC-Quickstart_1.0 UCC 1.0 Quickstart]
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| − | *[http://wiki.univention.de/index.php?title=Univention_Corporate_Client UCC Wiki]
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| − | *[http://forum.univention.de/viewforum.php?f=65 Start a topic in the EN forum]
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