How to Write Logs to Systemd Journal Using syslog, printf, and sd_journal in Linux

This article demonstrates three methods for sending logs to the systemd journal—using the libc syslog() function, capturing stdout/stderr via printf(), and employing the native systemd sd_journal API—complete with C, Python, and Bash examples, service setup, and log filtering techniques.

C programmingjournallogging

0 likes · 9 min read

How to Write Logs to Systemd Journal Using syslog, printf, and sd_journal in Linux

ITPUB

Nov 4, 2020 · Operations

Understanding Linux ext4 File System: Inodes, Extents, and Caching Mechanisms

This article explains the core design of Linux file systems, covering strict organization, block and inode structures, ext4 formatting details such as extents and meta block groups, directory storage, journaling modes, and the kernel's cached and direct I/O paths for reading and writing files.

Linuxext4extents

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Understanding Linux ext4 File System: Inodes, Extents, and Caching Mechanisms

MaGe Linux Operations

Aug 7, 2014 · Operations

How to Recover Deleted Files on Ext3/Ext4 Linux Filesystems Using D‑Recovery

This article explains why recovering deleted data on Ext3/Ext4 Linux filesystems is challenging, describes the role and limitations of the journal log, and provides a step‑by‑step demonstration of using D‑Recovery for Linux to restore files after deletion.

D-RecoveryData RecoveryExt3

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How to Recover Deleted Files on Ext3/Ext4 Linux Filesystems Using D‑Recovery