Step-by-step guide to troubleshooting stuck and hung NFS mounts on AlmaLinux 10: hard vs soft mounts, D-state processes, stale file handles, forced and lazy unmounts, rpcinfo, nfsstat, tcpdump and server-side checks.
firewall-cmd cheat sheet for RHEL, AlmaLinux, Rocky Linux, Oracle Linux and CentOS Stream: zones, services, ports, rich rules, NAT, policies, IP sets and troubleshooting.
Build a central rsyslog log server on RHEL, AlmaLinux, Rocky Linux, Oracle Linux and CentOS Stream: TCP forwarding with disk queues, per-host files, logrotate, SELinux, firewalld and TLS.
