What Is Server Monitoring and What Should You Monitor?
Server monitoring should cover user access, latency, error, CPU, RAM, disk, network, service, database, TLS and backup with Alert and Runbook that can be acted upon.
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LINUX / DEVOPSLooking for a term or account guide?Visit the knowledge base
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Linux and server operations
20 articlesShowing 1–12
What Is the Best Server Backup Strategy?
Design a professional server backup with RPO/RTO, compatible database and file versions, encryption, retention, separation, immutability, monitoring and restore testing.
Why Does Automatic Let’s Encrypt Renewal Fail?
Fix the SSL extension failure by checking the timer, renewal config, DNS, HTTP/DNS challenge, firewall, credential, rate limit and reload service step by step.
How to Install a Free Let’s Encrypt SSL Certificate
To install the free SSL Let's Encrypt, set up DNS, ACME, Certbot, Nginx, chain of certificates, redirect and automatic renewal step by step and reversible.
How to Configure a Linux Server Firewall Safely
Set up Linux firewall with inventory flow, default policy, secure SSH, IPv4/IPv6, cloud firewall and external testing; with anti-lock rollback.
What Is Fail2ban and Do You Need It?
Fail2ban temporarily blocks logs for failure patterns and IPs; identify restrictions, jail, backend, firewall, test and prevent lockdown.
How to Secure SSH Without Locking Out the Administrator
Secure SSH with separate account, public key, root and password restrictions, firewall, MFA, log and recovery path; without locking administrator access.
How to Apply Basic Linux Server Security Without Locking Yourself Out
Secure the Linux server with inventory, patch, SSH key, separate user, firewall, minimum access, secret, backup and step monitoring; with rollback path.
How to Tune PHP-FPM for a Server
Configure PHP-FPM by measuring worker memory, concurrency, queue, slow log and CPU/RAM capacity and execute the changes stepwise and reversible.
What Is the Linux OOM Killer and Why Does It Stop Services?
Identify the OOM Killer from the kernel log, cgroup, and RAM process, separate the victim process from the stress factor, and fundamentally modify capacity, limit, and…
Why Is the Server Disk Full? Logs, Deleted Files, Docker, and Inodes
Recognize Linux Disk overflow with filesystem, inode, directory, log, deleted file open, Docker and database; without rushing to delete production data.
How to Find the Cause of High Server Memory Usage
Analyze Linux RAM usage with available, cache, swap, RSS/PSS, process, container and OOM and separate the memory leak from normal memory usage.