Howto

In this tutorial we’ll learn how to add custom paper to CUPS printer in Linux/MacOS, for example we’ll try to add A6 paper size. To get the right size we might need to do trial/error because not all the printer had the same size for A6, check the manufacture for guidances. For cups it is … Read more

Hetzner is one of many provider that had official terraform provider, by using terraform it easy to deploy many server with less code and without touching the UI. After we learn about this we can provision the server less than one minute, which save time for big project. Each terraform provider comes with their own … Read more

In this tutorial we’re going to see example how to work with JSON in Groovy and how to parse it. We’ll make it as simple as it is, so we don’t need to add any external dependency, just run it like a shell scripts. For this tutorial we’ll use Groovy 4.*, but it should work … Read more

If you’re encounter the issue with following error messages when start the VirtualBox machine VirtualBox can’t enable the AMD-V extension. Please disable the KVM kernel extension, recompile your kernel and reboot (VERR_SVM_IN_USE)., that mean there are another kernel module that running, to check it use lsmod sudo lsmod | grep -E ‘kvm|vbox’ # output vboxnetadp … Read more

For this tutorial we’ll create our own HTTP/HTTPS monitoring based on Python requests. Out there so there are so many free or paid monitoring tools, which is too expensive or too bloat for my use case, which only to monitor the HTTP response and show the messages if there’s any error. To make it easier … Read more

In this tutorial we’ll setup secure FTP Server using vsftp software, we’ll allow multiple user to connect to FTP and disable the anonymous user. In many big corporate environment, they only allow FTP protocol, this setup is good for that use case. There’s some confusion about the SFTP, people thing it’s part of FTP, but … Read more

In some of WordPress based blogs, I get more than 10000 (10k) comments, which all of them spams. Using WordPress UI to delete comment is not an easy task, because we’re limited to delete 20 comment per actions. Instead of installing random plugin, let’s do it via SQL (MariaDB/MySQL) query. Inside the WordPress database it … Read more

For any operation in Linux, we might facing the same issue Failed to allocate directory watch: Too many open files The default defined inotify instances (128) has been reached This happen a lot if we run Kubernetes cluster. 128 is the default number for various Linux distro, for heavy user we need to adjust this … Read more

After upgrade to the nginx 1.26 on Debian 12, sudo nginx -t throw some warning issue in the nginx config $ sudo nginx -t nginx: [warn] the "listen … http2" directive is deprecated, use the "http2" directive instead in /etc/nginx/sites-enable/atetux.conf:7 for now that not a issue, just a warning. But it’s better to fix it … Read more