<> = Status = * EL9 at Zeuthen will become the default and recommended Linux version: * Users and groups are encouraged to test their software packages for EL9-compliance * DESY's EL9 distribution is currently based on [[https://almalinux.org/|AlmaLinux]] * A '''test system''' is accessible via the alias name '''el9.zeuthen.desy.de'''. It has been set up with a WGS configuration and is meant to be used for tests and development, not for running production jobs. * Another way to try EL9 is to use the [[Apptainer]] container, which is possible on WGSs, compute nodes and even Linux desktops. * For EL9-based desktop systems see below. == EL9 presentations == * none yet == Changes w.r.t. SL7 from the user's point of view == === Enhancements === * IPv6 (dual stack) is enabled by default on all systems (desktops, wgs, batch farm nodes) === Changes regarding software === * The new default compiler version is GCC 11.3 == Known Problems == * none, yet = Desktops = Here are a few facts users of EL desktops should be aware of: == Access == * All user accounts valid at DESY Zeuthen can log in on the local graphical login screen. * No remote access via ssh. == Local Home Directory == * Home directories reside on the local disk. * Please note that local disks are not redundant and may break or vanish otherwise anytime. * There is no central backup. * It is recommended to arrange for a personal backup of the home directory with vorta. The software is installed by default. * There is a 4 GB home quota. * We need to set a quota to keep things manageable. It avoids problems when desktops are used by more than one user, which is still a frequent case, and also keeps making backups feasible and consume reasonable amounts of resources. If downloads etc. don't fit into the home directory, there's more local space available in `/tmp`. Files there will be cleaned up two weeks after they were last accessed. Unlike "usual" RHEL installations, `/tmp/` is not cleared when our systems are rebooted. == AFS Client == * The AFS client is installed by default, the local directories are available at '/afs/ifh.de' == Adding and Removing Software Packages == * Local users can install software from the configured repositories of permitted package sources. * These changes are not saved or recorded centrally, and will vanish when a system is reinstalled. * There is considerable potential for getting the system into a bad state, thus this feature should be used with care and thought. * The graphical user interface 'Software' is in the menu by default. * On the command line, you can use the `pkcon(1)` command. Just translate `sudo dnf install ` into `pkcon install `. * You can also install third-party software using the command `flatpak(1)`. The Zoom client is already installed using flatpak, to install Google Chrome, type ```flatpak install com.google.chrome``` == Remote access to the Windows Terminal server == If you don't want to use the [[https://znrdsweb.zeuthen.desy.de/RDWeb/webclient/index.html|web access]], use the preinstalled version of remmina. == Reinstallation == * Anyone with access to the local console can reinstall the desktop from scratch. Requesting a network (PXE) boot during startup will result in presentation of a menu with all available desktop OS options to choose from. * Note that a reinstallation will wipe the local disk and any prior content will be lost irrecoverably. == Miscellania == * While GNOME3 (gnome-shell) is the default and recommended desktop environment, it is possible though to install a plethora of others from the configured repos. == Known Issues == * Firefox cannot play some videos, e.g. from the ARD Mediathek. * Screen sharing doesn't work from the Zoom client, you have to join the meeting in Firefox to share your screen or a window.