https://www.sre.wang/en/tags/linux/Recent content in Linux on SRE Engineering PracticeHugo -- gohugo.ioenFri, 17 Jul 2026 09:20:09 +0800https://www.sre.wang/en/posts/linux-kernel-crash-kdump/Fri, 17 Jul 2026 09:20:09 +0800https://www.sre.wang/en/posts/linux-kernel-crash-kdump/From kdump internals to crash tool analysis — a hands-on guide to configuring a production-grade kernel crash capture systemhttps://www.sre.wang/en/posts/linux-auditd-security-auditing/Wed, 15 Jul 2026 02:09:45 +0800https://www.sre.wang/en/posts/linux-auditd-security-auditing/From installation and deployment to rule writing, log analysis, and performance tuning—covering the complete production practice of auditdhttps://www.sre.wang/en/posts/linux-cpu-isolation-numa-tuning/Mon, 13 Jul 2026 03:22:07 +0800https://www.sre.wang/en/posts/linux-cpu-isolation-numa-tuning/From isolcpus to cpuset, NUMA affinity to IRQ pinning — a complete production-grade CPU isolation and tuning workflowhttps://www.sre.wang/en/posts/linux-namespace-cgroups-basics/Sun, 28 Jun 2026 16:34:00 +0800https://www.sre.wang/en/posts/linux-namespace-cgroups-basics/Practical guide on linux namespaces and cgroups for SRE operationshttps://www.sre.wang/en/posts/nginx-performance-tuning/Fri, 12 Sep 2025 19:44:00 +0800https://www.sre.wang/en/posts/nginx-performance-tuning/Practical guide on nginx performance tuning for SRE operationshttps://www.sre.wang/en/posts/linux-strace-debugging/Thu, 11 Sep 2025 12:45:00 +0800https://www.sre.wang/en/posts/linux-strace-debugging/Practical guide on linux system call tracing for SRE operationshttps://www.sre.wang/en/posts/linux-iptables-nftables/Fri, 10 Jan 2025 00:00:00 +0000https://www.sre.wang/en/posts/linux-iptables-nftables/An in-depth guide to the Netfilter framework, iptables five chains and four tables, nftables advantages, rule writing, NAT/port forwarding, connection tracking, and performance optimizationhttps://www.sre.wang/en/posts/linux-process-scheduling/Wed, 29 May 2024 00:00:00 +0000https://www.sre.wang/en/posts/linux-process-scheduling/An in-depth analysis of the Linux CFS scheduler, nice values and cgroup CPU control, real-time scheduling, CPU affinity, and scheduling latency troubleshootinghttps://www.sre.wang/en/posts/linux-memory-management-tuning/Thu, 09 May 2024 00:00:00 +0000https://www.sre.wang/en/posts/linux-memory-management-tuning/An in-depth guide to Linux virtual memory, Page Cache, Swap, OOM Killer, cgroup v2 memory limits, and memory leak troubleshooting with real-world caseshttps://www.sre.wang/en/posts/linux-boot-process-grub/Fri, 03 May 2024 00:00:00 +0000https://www.sre.wang/en/posts/linux-boot-process-grub/From BIOS/UEFI to GRUB2, initramfs, and systemd boot process — covering target/runlevel, service dependency management, boot performance optimization, and kernel crash recoveryhttps://www.sre.wang/en/posts/linux-package-management/Fri, 26 Apr 2024 00:00:00 +0000https://www.sre.wang/en/posts/linux-package-management/Comprehensive guide to apt/dpkg and yum/dnf/rpm ecosystems, covering repository management, dependency resolution, deb/rpm package building, version pinning, offline installation, and mirror optimizationhttps://www.sre.wang/en/posts/linux-disk-io-diagnosis/Wed, 27 Mar 2024 00:00:00 +0000https://www.sre.wang/en/posts/linux-disk-io-diagnosis/A systematic guide to Linux disk I/O performance metrics, diagnostic tools, I/O scheduler selection, SSD/HDD optimization differences, with a real-world high I/O wait troubleshooting casehttps://www.sre.wang/en/posts/cron-vs-systemd-timer/Mon, 18 Mar 2024 00:00:00 +0000https://www.sre.wang/en/posts/cron-vs-systemd-timer/From cron syntax to systemd timer advantages, from task design to failure retry and alerting — a systematic comparison of two scheduling solutions with distributed scenarios coveredhttps://www.sre.wang/en/posts/linux-log-management-journalctl/Wed, 14 Feb 2024 00:00:00 +0000https://www.sre.wang/en/posts/linux-log-management-journalctl/journald internals and configuration, journalctl query techniques, logrotate log rotation, structured logging, remote log collection, and practical log analysishttps://www.sre.wang/en/posts/linux-systemd-deep-guide/Tue, 13 Feb 2024 00:00:00 +0000https://www.sre.wang/en/posts/linux-systemd-deep-guide/From systemd architecture to in-depth unit file analysis, covering dependency management, cgroup resource control, journalctl log management, and production-grade service file writinghttps://www.sre.wang/en/posts/linux-performance-profiling-tools/Fri, 19 Jan 2024 00:00:00 +0000https://www.sre.wang/en/posts/linux-performance-profiling-tools/From top/htop/atop to perf/flamegraph, covering CPU, memory, IO, and network performance profiling tools with use-case quick reference and real-world exampleshttps://www.sre.wang/en/posts/shell-automation-tips/Thu, 11 Jan 2024 00:00:00 +0000https://www.sre.wang/en/posts/shell-automation-tips/Practical Shell scripting tips for automated operations: log cleanup, batch health checks, auto-restart, and config backuphttps://www.sre.wang/en/posts/linux-fs-filesystem-optimization/Mon, 01 Jan 2024 00:00:00 +0000https://www.sre.wang/en/posts/linux-fs-filesystem-optimization/In-depth comparison of ext4/xfs/btrfs/zfs, mount parameter optimization, I/O scheduler selection, journal modes, fsync performance, and SSD/TRIM tuninghttps://www.sre.wang/en/posts/linux-kernel-parameters-tuning/Thu, 21 Dec 2023 00:00:00 +0000https://www.sre.wang/en/posts/linux-kernel-parameters-tuning/A comprehensive guide to the sysctl system, covering network parameters, file descriptors, memory parameters, security parameters, production tuning templates, and parameter validation methodshttps://www.sre.wang/en/posts/linux-security-hardening-checklist/Mon, 18 Dec 2023 00:00:00 +0000https://www.sre.wang/en/posts/linux-security-hardening-checklist/A systematic guide to Linux security hardening: minimal installation, SSH hardening, SELinux/AppArmor, auditd auditing, firewall management, with a runnable security baseline check scripthttps://www.sre.wang/en/posts/linux-ssh-security-best-practices/Tue, 12 Dec 2023 00:00:00 +0000https://www.sre.wang/en/posts/linux-ssh-security-best-practices/SSH key and certificate authentication, sshd_config hardening, bastion host, port forwarding and reverse tunnels, SSH Agent, audit logging, and Fail2ban — a complete practical guide