First, renew letsencrypt ssl certificate. And then copy the new SSL certificate files to zimbra's folder. Follow by replacing the existing commercial key with private key. Finally, deploy and then restart zimbra service.

Edit `Global.asax` file. Import the `System.Net` class and then change the security protocol to tls1.2 in the `Applicatin_Start` method.

Add the <meta charset="utf-8" /> tag inside the head tag of the web page. Also add the following setting inside the <configuration><system.web> tag in the web.config file.

A heap is a tree-based data structure which satisfies the heap property, if the parent node is greater than the child node is called max-heap or if the parent node is less than the child node is called min-heap.

Koken is a content management system (CMS) and web site publishing for photographers. Your images are your most important asset. Koken treats them with the attention they deserve by including a full-featured management interface that looks and feels like a desktop application.

Ghost blog platform doesn't support code highlight. Forunately, there are many solutions out there. One of them is Prism. Prism supports many languages; such as javascript, sql, bash, etc.

Move CentOS 7 logical volume manager (LVM) partition to another disk. And then delete the old LVM partition.

Shrinking logical volume (LVM) must go through several steps. Unlike standard partition (ext4 file system). In order to shrink root logical volume, we must boot into a live CD like SystemRescueCD. And then shrink the volume from there.

Sometimes we forget root password and needs to reset. One of the approach is to reset via SystemRescueCD.

Qcow2 file grows overtime; even if we delete files and snapshots. It still does not reduce the file size. The only way to that is to fill the disk with zero and then convert the disk to qcow2.

First we need to shrink the partition, and then shrink the qcow2 file.

This section covers adding storage devices to a guest. Additional storage can only be added as needed.

Doing MySQL load balancing on HAProxy has several advantages; such as ip address restriction. Configuring MySQL to use HAProxy proxy protocol is a ticky part. It needs to know HAProxy ip address.