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Running Systems

(and me chasing them)

Running Systems
Running Systems
(and me chasing them)
  • Preventing AutoFS from slowing down the system
    bash | Disk Storage | Linux

    Preventing AutoFS from slowing down the system

    Byetzion 15/04/202415/04/2024

    I am using autofs (or automout) to handle shares presented on an NFS server I am using. When I am not home, or when the server is inaccessible, I do not want to be delayed by autofs failure to mount. This failure could take a long while, causing Autofs delay mount. During that time –…

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  • Mitigating Docker Build Issues on Older glibc Hosts
    Containers | Linux

    Mitigating Docker Build Issues on Older glibc Hosts

    Byetzion 28/03/202428/03/2024

    When running newer operating systems as Docker containers on older host systems—such as Ubuntu 20.04 or CentOS 7—a compatibility issue arises due to a new glibc call (clone3) not translating correctly to the older glibc (<=2.34) of the host system, resulting in the call being incorrectly translated, and blocked. One workaround to this issue involves…

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  • SSH Client improvements
    Linux

    SSH Client improvements

    Byetzion 17/02/202417/02/2024

    This article is going to concentrate several SSH client related topics and optimisations I have implemented. Amongst are: SSH client modular configuration Initially, the configuration for SSH client should be present (per-user) in the user’s home directory, under .ssh/config. I believe that this configuration file is not modular enough, and when you want to add/edit/remove…

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  • Oracle Linux 8 RPM installation broken
    Linux | Oracle

    Oracle Linux 8 RPM installation broken

    Byetzion 16/02/202416/02/2024

    I got the following error message when attempting to upgrade RPM packages: Oracle Linux 8 introduced a bug with a package called rpm-plugin-selinux (details: rpm-plugin-selinux-4.14.3-28.0.1.el8_9) which prevents RPM packages from being installed correctly, either by dnf/yum or manually. The solution, as shown in this Oracle community forum is to downgrade the package rpm-plugin-selinux like that:…

    Read More Oracle Linux 8 RPM installation brokenContinue

  • Cisco AnyConnect on Linux solution to “Authentication failure due to problem verifying server certificate” error message
    Linux

    Cisco AnyConnect on Linux solution to “Authentication failure due to problem verifying server certificate” error message

    Byetzion 22/01/202422/01/2024

    This is a very technical and a limited solution to Cisco AnyConnect issue with unknown certificate on Linux (Ubuntu 22.04). AnyConnect version is 4.10. I hope this post will help others with a similar problem. The issue is around SAML authentication (an embedded web browser attempting to complete the authentication process), and its failure to…

    Read More Cisco AnyConnect on Linux solution to “Authentication failure due to problem verifying server certificate” error messageContinue

  • Allow Postfix to call custom scripts by using mail aliases
    bash | Linux | Scripting/Programming

    Allow Postfix to call custom scripts by using mail aliases

    Byetzion 11/01/202411/01/2024

    Using custom mail aliases to run scripts is an existing practice. However, on modern Linux distributions it is blocked as a security risk. Following Postfix common guidelines do not allow for it to run the scripts. It reports the script as called, however – it does actually nothing. This has been verified on Oracle Linux…

    Read More Allow Postfix to call custom scripts by using mail aliasesContinue

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