Connect to a KVM host through an ssh tunnel and arbitrary port in Windows 11 and WSL 2
Connect virt-manager to a KVM host through an ssh tunnel and arbitrary port in Windows using Windows 11 and WSL 2.
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Windows 11 and WSL 2 DevOps environment
In this post I describe some of the settings and changes I made to make my Windows 11 and Ubuntu WSL2 into a fully fledged development environment. Here are the settings and tools I use for DevOps / SysOps on Windows.
Release hold queue email in Postfix – postsuper
The postsuper command controls different types of queues in the Postfix mail system, like the deferred or hold queue. This post shows you some Postfix queue operations to maintain your mail servers.
Restore single MySQL table from a full mysqldump backup file
Learn how to restore a single table from a full MySQL mysqldump backup file using Bash shell in Linux
Generate pseudorandom passwords with OpenSSL
OpenSSL comes in handy when you need to generate random passwords, for example for system accounts and services. In this short post I'll give you a quick example on how to generate random passwords with OpenSSL in Linux (Bash), Windows and PHP.
Tunnel RDP through SSH & PuTTY
Have you ever been in a situation where you needed to perform remote administration on a Windows Server, and the RDP port 3389 is blocked on a firewall? You can tunnel RDP over SSH with PuTTY
Turn off swap
Learn how to turn off swap in Bash, because when a swap partition is enabled Linux starts swapping, which may degrade (MySQL) system performance
Convert decimal to hex in Bash, hexadecimal to decimal and dates to Unix timestamp
Cconvert decimal to hex hexadecimal to decimal and Unix timestamps in Linux Bash. A quicky for my archives.
Delete all MAILER-DAEMON emails in Postfix queue
How to delete all MAILER-DAEMON emails from your Postfix queue, when it matches a sender or recipient email address condition. In Postfix, there are various similar commands to delete messages from the Postfix mail queue, based on the Message-ID and/or email address for example...
Test SMTP authentication and StartTLS
Investigate SMTP authentication issues like a boss! When using TLS encrypted SMTP connections, it's always handy if you are able to create a SMTP logon credentials and test SMTP authentication over a TLS/StartTLS connection. Preferably from your command-prompt.
Bash: Grep through a large number of files – “Argument list too long”
/bash/grep and /bash/rm give me an error Argument list too long. Here is how to overcome this error with Bash grep and rm.
Check IP address blacklist status in Bash
Here is a Linux Bash shell script to check whether an IP address is listed in a DNSBL blacklist, or RBL. Using this script in Bash you can quickly test if an IP address is blacklisted.