SysAdmin

A quick bash one-liner that lists every disk label present in /dev/disk/by-label/ that is not currently mounted, so you can spot forgotten or orphaned volumes at a glance.

Tune Linux VM memory behavior by adjusting vfs_cache_pressure, dirty_ratio, and swappiness to reduce unnecessary swapping and improve I/O throughput.

A quick bash one-liner that pulls per-user CPU time, connection counts, and active session details from MySQL’s INFORMATION_SCHEMA and processlist tables.

Use Apache mod_rewrite to return a 400 error for a specific URI and optionally block hotlinking from other domains. A quick .htaccess snippet that keeps unwanted traffic off a single page.

A visual walkthrough of the core networking components that make up an Amazon VPC, from subnets and gateways to security groups and route tables. Understanding how these pieces interact is essential for designing secure, well-segmented cloud networks.

An overview of how AWS IAM policies are structured, including the six policy types and the key elements of a policy document. Learn how to apply the principle of least privilege when defining permissions.