I using fedora 28 my laptop. Now I will "Upgrading Fedora 28 to Fedora 29" . Fedora 29 was just officially releases . Before not yet Upgrading to Fedora 29. [huupv@huupv huuphan.com]$ cat /etc/redhat-release Fedora release 28 (Twenty Eight) Using the command line to Upgrading Fedora 28 to Fedora 29 Update software and backup your system [huupv@huupv huuphan.com]$ sudo dnf upgrade --refresh Install the DNF plugin [huupv@huupv huuphan.com]$ sudo dnf install dnf-plugin-system-upgrade Start the update with DNF [huupv@huupv huuphan.com]$ sudo dnf system-upgrade download --releasever=29 Reboot and upgrade [huupv@huupv huuphan.com]$ sudo dnf system-upgrade reboot

Introduction Learn how to configure iptables for your Zimbra open source server. This guide provides detailed instructions to ensure your Zimbra services are secure and optimized. Securing your Zimbra open source mail server is a crucial step in maintaining a reliable and secure email system. One of the most effective ways to secure your Zimbra server is by configuring iptables, a powerful firewall tool in Linux. Properly configured iptables rules ensure that only necessary services are accessible, reducing the attack surface and enhancing overall security. In this comprehensive guide, we will walk you through the essential iptables configurations needed to protect your Zimbra server. We will cover specific rules for SMTP, HTTP, POP3, IMAP, LDAP, HTTPS, and more. This tutorial is tailored for Zimbra open source users, ensuring that your server remains secure while providing the necessary services to your users. Why is Iptables Important for Zimbra? Before diving into the configuration

I guide to the Linux " Top command ". The top command allow monitor processes and system resource usage on Linux. It is a best tools for system admin. Top command in linux Getting start top command you can type "top" in terminal very simple. [huupv@huupv huuphan.com]$ top  If you want to quit, then press "q" The screen output terminal as below Top command usage example How to killing processes, sorting the process list, showing full paths, forest view and Listing processes from an user. Killing processes you want to kill a process, press "k" when top command is running and ask for the process ID and press enter. If you leave the process ID blank and hit enter. Sorting the process list The most frequent reasons to use a tool like top is to find out the consuming the most resources. you can press key for sorting list. ‘M’ to sort by memory usage ‘P’ to sort by CPU usage ‘N’ to sort by process ID ‘T’ to sor

Introduction Learn how to effectively solve the "mount.nfs stale file handle" issue in Linux with this step-by-step guide. Understand the cause, find the mounted directory, and implement the best solution for remounting from the NFS client. The "mount.nfs stale file handle" error is a common issue faced by Linux users, particularly when dealing with Network File System (NFS). This error can be frustrating as it prevents users from executing commands on the NFS server terminal. It typically occurs when the NFS server experiences disruptions, such as a reboot, or when there are issues with the file system. This guide will walk you through the causes of this error and provide a detailed solution to fix it, ensuring that your NFS client and server continue to function smoothly. Understanding the "mount.nfs stale file handle" Error What Is the "mount.nfs stale file handle" Error? The "mount.nfs stale file handle" error occurs when a file sys

Web developers want to fast loading web pages. How to optimize image for web site with PNGs image. I using Linux operating system. Checking load web page I am use Browser Calories plugin add-ons to check web page. Web optimization Installing the tool gimp, imagemagick and optipng [huupv@huupv DR]$ sudo yum install gimp ImageMagick optipng Step 1: Get some basic information about Image Using the file command to get some information about this image [huupv@huupv Banner]$ file Devopsroles.png The screen output terminal Devopsroles.png: PNG image data, 512 x 512, 8-bit/color RGBA, non-interlaced Using identify command get some basic information about image [huupv@huupv Banner]$ identify Devopsroles.png The screen output terminal Devopsroles.png PNG 512x512 512x512+0+0 8-bit sRGB 27579B 0.000u 0:00.000 Step 2: Run optipng command to losslessly optimize your images. [huupv@huupv Banner]$ optipng -o7 Devopsroles.png The screen output terminal ** Pro

In this tutorial, How do i use ls command. The syntax ls command ls [Option] Full list [Option] of ls command ls -a list all files including hidden file starting with '.' ls -r list in reverse order ls -R list recursively directory tree ls -s list file size ls -S sort by file size ls -t sort by time & date ls -X sort by extension name ls --color colored list [=always/never/auto] ls -d list directories - with ' */' ls -F add one char of */=>@| to enteries ls -i list file's inode index number ls -l list with long format - show permissions ls -la list long format including hidden files ls -lh list long format with readable file size ls -ls list with long format with file size For example List all files and folder with option list reverse order, sort by time & date [huupv@huupv huuphan.com]$ ls -lrt The different between files and folders and symbolic link and other with ls -F option [huupv@huupv huuphan.com]$ ls -F Here, "/&

In this tutorial, How do i use linux command write cron job. Crontab example Run cron job At every 15th minute for zimbra_full_backup.sh */15 * * * * /opt/scripts/zimbra_full_backup.sh https://crontab.devopsroles.com/ Write cron job from linux command [root@huupv huuphan.com]# echo "$(crontab -l; echo '*/15 * * * * /opt/scripts/zimbra_full_backup.sh')" | crontab - The screen output terminal: Conclusion Thought the article, How to write cron job from linux command as above . I hope will this your helpful.

In this tutorial, How do i use MySQL change user password. MySQL and MariaDB are the popular open source Database for Linux Opearating System.   Mysql change root password Note: MySQL default root password is empty when you installed Mysql or MariaDB. Now, How to reset Mysql root or other users password on linux. For MySQL 5.7 or above version Step 1: Open the command terminal. sudo mysql -u root Step 2: select the database. use mysql; Step 3: Change the root password. UPDATE mysql.user SET authentication_string=PASSWORD(' YOUR_NEW_PASSWORD ') WHERE USER='root'; FLUSH PRIVILEGES; exit For MySQL 5.7 version or older version Step 1: Open the command terminal. sudo mysql -u root Step 2: select the database. use mysql; Step 3: To change the MySQL root user password. update user set password=PASSWORD(" YOUR_NEW_PASSWORD ") where User='root'; FLUSH PRIVILEGES; exit  Step 4: restart the MySQL service systemctl restart mysq