This document provides the essential software versions and upgrade instructions for running Linux 2.0.x kernels successfully. It covers package compatibility, known issues, and practical solutions for system administrators upgrading from earlier kernel releases. Networking Configuration The loopback route configuration in many older network scripts is incorrect and will cause kernel errors in 2.0.x. Look for…
This document preserves the original Linux 1.0 release notes (source: linux-1.0.tar.gz), released in March 1994. It’s a snapshot of early Linux kernel development and shows the rapid pace of improvement during the pre-1.0 era. The original ASCII formatted version appears at the end of this post. Changes since 0.99 patchlevel 15 Removed all the bugs,…
This document preserves the historical release notes for Linux v0.95 (March 7, 1992), one of the earliest public kernel versions. These notes provide valuable insight into early Linux development decisions and technical challenges. The original notes are presented here with minor formatting improvements for readability. Copyright Linux 0.95 is copyrighted under the GNU General Public…
Linux v0.12 is a historical kernel release from the early days of Linux development. This document preserves the original release notes with minimal modifications to improve readability and accuracy. These notes are primarily of archaeological interest to those studying early Linux kernel history. Copyright The Linux copyright was updated to conform with the GNU General…
This document preserves the original release notes for Linux kernel version 0.01, the first public release by Linus Torvalds in 1991. These notes provide historical context on the early design decisions and limitations of what would become the world’s most widely used operating system kernel. Contents The 0.01 distribution included: linux-0.01.tar.Z — kernel source code…
Linux 5.4.72 is a stable kernel update containing 23 commits and approximately 126,508 lines of code changes compared to the base 5.4 release. This release focuses on critical security and stability fixes across cryptography, filesystem, USB, Bluetooth, and architecture-specific code paths. Cryptography and Security Fixes QAT cipher validation Added length validation for AEAD AES-CBC-HMAC operations…
Hyperledger Fabric is a modular, enterprise-grade consortium blockchain platform. While its official documentation is comprehensive, deploying a test network from scratch requires configuring multiple dependencies and tools—a process that’s time-consuming for new users. This guide covers both automated and manual setup approaches to get a working Fabric network running quickly. Prerequisites You’ll need: Ubuntu 24.04…
/dev/shm is a tmpfs mount that allocates storage from your system’s RAM rather than disk. It’s commonly used for inter-process communication (IPC), shared memory segments, and temporary data that needs low-latency access. By default, Linux allocates half your total RAM to /dev/shm, but you’ll often need to adjust this for specific workloads. Checking Current Size…
Filesystem corruption occasionally happens. When it does, you need fsck to run before the system fully mounts its filesystems. Here’s how to force a filesystem check during the next boot. Using touch to Mark Filesystems The traditional method is to create /forcefsck: sudo touch /forcefsck sudo reboot On the next boot, the system will check…
When running virtual machines with QEMU/KVM, you’ll frequently need to transfer files or share directories between the host and guest systems. Several methods work well depending on your use case and performance requirements. 9p (Virtio) Filesystem The 9p protocol is the most straightforward approach for sharing directories. It’s lightweight and doesn’t require additional guest agents….
When trying to mount an encrypted EncFS directory as a normal user, you may encounter this error: $ encfs -s ~/t/.enc ~/t/enc EncFS Password: fuse: failed to exec fusermount: Permission denied fuse failed. Common problems: – fuse kernel module not installed (modprobe fuse) – invalid options — see usage message Even though the same command…
curlftpfs is a FUSE-based filesystem that lets you mount FTP/SFTP servers as local directories. This is useful for treating remote FTP locations like local storage without downloading files individually. Prerequisites FUSE kernel module loaded (usually default on modern systems) Root or sudo access Network connectivity to your FTP server Installation on RHEL/CentOS/Rocky Linux The curlftpfs…
When you try to unmount a filesystem, Linux sometimes refuses with a “device is busy” error. This safety mechanism prevents data loss when processes are actively using the filesystem. But there are legitimate cases where you need to force an unmount: a dead NFS server, a failed USB device, or a hung mount that won’t…
When you need to access files from a Xen guest’s disk image without booting the VM, you can attach and mount its partitions directly on the host using kpartx. This is useful for recovery, forensics, backup verification, or migrating data between systems. Using kpartx to expose partitions The kpartx utility creates device mappings for partitions…
When an NFS server goes down or becomes unreachable, client mounts can end up in a “Stale NFS file handle” state. Standard umount and umount -f commands fail, leaving you stuck with an unusable mount point and no clean way to recover without rebooting. The solution is to use umount -l (lazy unmount), which immediately…
You may need to deactivate a LVM volume group to make it unknown to the kernel — typically before removing disks, migrating storage, or performing maintenance. The vgchange command handles this with the -a (or –activate) flag. Basic deactivation To deactivate a volume group named vg, use: vgchange -a n vg The -a n flag…
When you connect an external hard drive with LVM volumes to a RHEL, CentOS, or Rocky Linux system, the logical volumes don’t automatically appear in /dev. Unlike some distributions that handle this automatically, you need to manually activate them using vgchange. Activating LVM Volumes First, plug in your external drive. Then activate all logical volumes…
When processing delimited data in Bash, you often need to drop the last N fields from each line without knowing the total field count. The naive cut -d’.’ -f1 approach fails immediately when field counts vary. Given input like: systemd.3.gz systemd.mount.3.gz systemd.mount.f.3.gz You want to remove the last 2 fields (.3.gz) to get: systemd systemd.mount…
On a Linux system, you often need to let regular users mount and unmount specific devices without requiring sudo or the root password. This is common for external drives, USB devices, or secondary internal disks. There are several approaches, each with different security and usability tradeoffs. Using /etc/fstab with the user Option The simplest approach…
When a filesystem listed in /etc/fstab fails to mount during boot, the system can hang or drop to an emergency shell, preventing normal startup. This happens because the kernel treats all mount entries equally by default. Non-critical filesystems—network shares, external drives, or optional data partitions—shouldn’t block your entire system from booting. Understanding fstab mount options…