David Tio's Blog

18 January 2026 ldap active-directory ssl linux sles sysadmin

LDAP Search Over SSL (LDAPS) to Active Directory

Query Active Directory over LDAPS from Linux — import the AD CA certificate, configure trust, and run ldapsearch with encrypted connections.

15 January 2026 ssh linux sysadmin networking

Access a server's localhost-only application from your workstation using SSH port forwarding — one command, no extra tools needed.

12 January 2026 saltstack suse leap automation linux

Install SaltStack on openSUSE Leap 15 — configure the master, connect minions, and run your first remote command across managed servers.

11 January 2026 rhel active-directory sssd realm linux sysadmin

Join RHEL to Active Directory in four commands — install realmd and sssd, configure auth, join the domain, and set home directory format.

08 January 2026 linux sed sysadmin command-line

Replace text across multiple files with sed. And when your replacement contains forward slashes, here's the trick — change the delimiter.

05 January 2026 rhel vmware xorg mouse linux virtualization

RHEL 5 on VMware has no mouse pointer in the GUI? The xorg.conf is missing the vmmouse driver. Add these lines and you're back in business.

04 January 2026 vagrant suse leap virtualization linux

Get Vagrant running on openSUSE Leap 15 — install VirtualBox, configure permissions, create your first VM, and fix a common missing-directory issue.

04 January 2026 vagrant virtualization linux sles devops

Replace Vagrant's default NAT networking with bridged networking and enable standard SSH with password auth — so your VMs behave like real servers.

01 January 2026 pfsense scp ssh networking firewall

SCP to pfSense fails with 'Illegal option -X'? Here's the one-line fix — use the root account instead of admin.