When using recursive make invocations, GNU make prints “Entering directory…” and “Leaving directory…” messages for each nested call. These messages clutter build output and make logs harder to read, especially in projects with deeply nested makefiles. The problem By default, GNU make prints these messages to help track execution flow in complex builds. For a…
Adding a second metadata directory to your HDFS NameNode increases reliability by maintaining synchronized replicas of the namespace and transaction logs across separate disks. This guide walks through the process safely. Prerequisites and Planning Before starting, verify your current configuration and plan the new directory location: grep -A2 “dfs.namenode.name.dir” $HADOOP_HOME/etc/hadoop/hdfs-site.xml The new directory should be…
Resizing a single image is straightforward, but processing dozens or hundreds requires automation. ImageMagick’s convert command (or the modern magick command) paired with a bash loop is the standard approach for batch image resizing on Linux. Using ImageMagick ImageMagick remains the most reliable tool for this task. Here’s a practical script to resize all images…
When you SSH to a server and see the warning below, your SSH client has detected that the server’s host key doesn’t match what’s stored locally: @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY! Someone could be eavesdropping on you right now (man-in-the-middle attack)!…
GNU Screen’s status bar (called the hardstatus line) displays useful information about your current session—which window you’re on, the time, hostname, and more. It’s especially helpful when you’re running multiple windows and need a quick visual reference without typing commands. Basic Status Bar Setup Add these lines to your ~/.screenrc: hardstatus alwayslastline hardstatus string ‘%{=…
Detecting whether an image is predominantly blank, black, or contains minimal content is useful for automated workflows like batch processing, quality control, or identifying failed captures. Here’s how to do it reliably on Linux. Using ImageMagick ImageMagick’s convert command (or magick in newer versions) can extract image statistics to determine if an image is nearly…
When managing HDFS clusters, you often need to verify the replication factor of specific files to ensure data redundancy meets your requirements. Here are the practical methods to check this. Using hdfs dfs -ls The most straightforward way is to list the file with hdfs dfs -ls: hdfs dfs -ls /usr/GroupStorage/data1/out.txt Output: -rw-r–r– 3 hadoop…
When you need to inspect what files a .deb package contains or will install, dpkg is your primary tool. This is useful for understanding package contents before installation, checking what files a package added to your system, or troubleshooting file conflicts. Listing files in an installed package If the package is already installed on your…
Converting a series of JPG images into a single PDF is useful for creating documents, presentations, or archiving scanned photos. Linux offers several tools for this task, each with different trade-offs between simplicity, quality preservation, and features. Using img2pdf (Recommended) For most cases, img2pdf is the best choice because it merges images without re-encoding or…
When you need to increase data redundancy or reduce storage overhead on a running HDFS cluster, you’ll often need to adjust the replication factor. Before making changes, understand that HDFS replication works differently than you might expect. How HDFS Replication Factor Works The replication factor in HDFS is determined at write time by the client,…
Removing version control or build artifact directories across a large directory tree is a common sysadmin task. SVN directories (.svn), Git metadata (.git), or node modules (node_modules) often need to be purged before deployment or archiving. Using find with xargs The most efficient approach combines find with xargs: find ./ -name “.svn” -type d |…
RTMP (Real Time Messaging Protocol) streams are still used for live broadcasts and on-demand video delivery, though less commonly than HLS or DASH. If you need to capture an RTMP stream, there are several solid tools available on Linux. Using ffmpeg (recommended) ffmpeg is the modern standard for working with RTMP streams. It’s widely available,…
HDFS snapshots provide a way to create read-only point-in-time copies of the filesystem or specific directories without duplicating data. Understanding their design helps you implement efficient backup strategies and recover from accidental deletions in production clusters. How HDFS Snapshots Work Snapshots in HDFS use copy-on-write semantics to avoid duplicating data. When you create a snapshot,…
Distribution repositories often lag behind Calibre’s latest releases. If your package manager shows an older version and you need current features or bug fixes, installing directly from the official installer is straightforward. Official installer method Calibre provides a dedicated Linux installer that works across distributions. This is the recommended approach for staying current: sudo -v…
GitBook is a tool for building documentation and ebooks from Markdown content. Here’s how to set it up on a Linux system. Prerequisites You’ll need Node.js installed first. On Ubuntu/Debian: curl -fsSL https://deb.nodesource.com/setup_20.x | sudo -E bash – sudo apt-get install -y nodejs On Fedora/RHEL: sudo dnf install nodejs Verify the installation: node –version npm…
As nodes are added or removed from a Hadoop cluster, storage utilization becomes uneven across DataNodes. Some fill up while others remain mostly empty, leading to inefficient resource use and potential storage bottlenecks. HDFS provides the Balancer tool to redistribute blocks across DataNodes and even out disk usage. Understanding the Balancer The HDFS Balancer is…
When you need a command or library file but don’t have the package installed, you need to search for which package provides it. On Red Hat/Fedora systems, yum provides or dnf provides does this. On Debian/Ubuntu, the equivalent is apt-file. Red Hat, Fedora, and CentOS (DNF/YUM) Use dnf provides (or yum provides on older systems):…
Node.js installation on Ubuntu and Linux Mint has evolved significantly. The approach depends on your use case — whether you need the latest stable version, multiple Node versions for different projects, or just a quick setup. Using the NodeSource Repository (Recommended) The NodeSource repository provides current, well-maintained Node.js packages. This is the best approach for…
When GitBook or other tools call Calibre’s ebook-convert command on a headless server, you’ll hit this error: RuntimeError: X server required. If you are running on a headless machine, use xvfb This happens because Calibre needs an X11 display server, even though you’re just converting files. The solution is to wrap ebook-convert with xvfb-run, which…
Fedora’s package manager has evolved, and modern Fedora releases use dnf instead of yum. Here’s how to install Node.js on current Fedora versions. Quick Install with DNF The simplest approach is to use Fedora’s repository: sudo dnf install nodejs npm This installs Node.js and npm from the official Fedora repositories. The version available depends on…