NoMachine session closes suddenly on Alma Linux?

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  • #41615
    dplNX
    Participant

    Setup:

    Alma Linux 9.1 (Server with GUI, default configuration)

    01. Spin up VM (16 cores, 64 GB mem) using AlmaLinux-9.1-x86_64-boot.iso

    02. Install Server-with-GUI

    03. Install NoMachine Terminal Server (dnf install nomachine-terminal-server_8.2.3_4_x86_64.rpm)

    04. Login using NoMachine Client (latest release) on Windows 11

    05. Create Virtual Desktop

    06. Gnome 04 Session appears, click console icon in application bar, session crashs immediately.

    Logs according to https://kb.nomachine.com/DT11R00182 are attached.

    Further advice would be appreciated.

    #41629
    dplNX
    Participant

    I switched to Alma Linux 8.7, which seems to work now, at least if I try to login using a local dummy user.

    If I try to login using SSSD + LDAP and NFS mounted home I get the following error message creating a virtual desktop:

    The session negotiation failed.

    Error: Cannot connect to NoMachine monitor.

    Any advice ?

     

    #41653
    Britgirl
    Keymaster

    Thanks for posting your topic and subsequent follow-ups.

    NoMachine supports the following Linux distributions: RedHat, Centos, Fedora, OpenSuse/Suse, Debian/Ubuntu, and although ALMA is based on Red Hat, we don’t officially support it. However, that doesn’t mean that it should not work, so we tested the latest version on the fly.

    “So I guess then NoMachine is not ready for Alma Linux 9.X ?”

    Well, it would appear that Alma Linux is not ready in general ;-)? We downloaded and installed the latest OS version from their website and it would not even install, and only produced Kernel Panic errors.

    “I switched to Alma Linux 8.7, which seems to work now, at least if I try to login using a local dummy user. If I try to login using SSSD + LDAP and NFS mounted home I get the following error message creating a virtual desktop:”

    Maybe the following resources could be useful:

    Connecting with NX protocol to a NoMachine server on Linux in an Active Directory domain
    https://kb.nomachine.com/AR12P01007

    and a very similar problem was reported here:

    NX Linux-SSSD-AD Issues with NFS4-Kerberos Home Dir

    “Looks like the issue can be resolved by disabling SeLinux and Firewalld, even XFCE4 is running. ”

    We recently fixed a bug on Red Hat 9, the workaround could be useful maybe?

    https://kb.nomachine.com/TR05T10538

    #41646
    dplNX
    Participant

    Thx for the response, I don’t know why there is no entry here, anyway after I rebooted the vm NoMachine Terminal Server using Alma Linux 8.7 including the full package (SSSD, LDAP, NFS) is working now.

    Regarding the Alma Linux 9.1 kernel panics, I can’t confirm them using AlmaLinux-9.1-x86_64-boot.iso.

    Perhaps you could help with the following questions as well:

    Is there a tutorial you can point me to, which  describes how to setup a redundant NX-Server using two Nodes ?

    Is it possible to setup a virtual display which is able to access one or mutliple Nvidia GeForce GTX Titan X to run 3D accel application on top of it ?

    Thank you for your assistance in advance.

    #41661
    Britgirl
    Keymaster

    Is there a tutorial you can point me to, which describes how to setup a redundant NX-Server using two Nodes ?

    You should check out the guide for NoMachine Enterprise Terminal Server Cluster, section 3.5. This is the product to choose if you want failover capabilities, and the cluster pair will act as a high-availability gateway to further virtual desktop nodes.

    https://kb.nomachine.com/DT09S00251#3.5

    The product page: https://www.nomachine.com/product&p=NoMachine%20Enterprise%20Terminal%20Server%20Cluster

    Alternatively, you can take a look at the Enterprise Cloud Server Cluster which also offers failover (a clustered pair). This products functions as a HA gateway to any NoMachine server product. This product does not run virtual desktop sessions, you can use it to centralise access to multiple nodes, nodes which support Linux virtual desktops.

    More about this product here:https://www.nomachine.com/product&p=NoMachine%20Enterprise%20Cloud%20Server

    All our guides are available in the support section of the website: https://www.nomachine.com/all-documents

    Is it possible to setup a virtual display which is able to access one or mutliple Nvidia GeForce GTX Titan X to run 3D accel application on top of it ?

    To use HW acceleration on your within NoMachine sessions, please consult the following resources:

    How to enable H.264 hardware and software encoding/decoding in NoMachine remote desktop sessions
    https://kb.nomachine.com/AR10K00706

    The X11 vector graphics mode in X-Window virtual desktop
    https://kb.nomachine.com/AR02L00779

    How to enable VirtualGL support on Linux in NoMachine v. 6.2 or later
    https://kb.nomachine.com/AR05P00982

    Load-balancing of NoMachine virtual desktop sessions is possible, but not when VirtualGL has been enabled. More about this is here:

    Configuring NoMachine to distribute HW encoding workload among GPUs or off-load it to a specific GPU https://kb.nomachine.com/AR11T01179

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