CentOS related tutorial/FAQ

How to backup and restore LXD containers

last updated May 27, 2020 in Backup & Recovery, CentOS, Debian / Ubuntu, Fedora Linux, Linux, Linux Containers (LXC), RedHat and Friends

LXD backup and restore
Now that I set up an LXD container, how do I backup and restore LXD containers running on Ubuntu/Debian or Fedora/CentOS Linux server?

How to find ulimit for user on Linux

last updated May 24, 2020 in BASH Shell, CentOS, Debian / Ubuntu, Linux, RedHat and Friends, Suse

How can I find the correct ulimit values for a user account or process on Linux systems?

How to extract tar.xz files in Linux and unzip all files

last updated May 24, 2020 in BASH Shell, CentOS, Debian / Ubuntu, Linux, RedHat and Friends, Suse

How do I extract tar.xz files in Linux? Can you tell me command to unzip linux-5.6.13.tar.xz file? How can I uncompressing (or decompressing) all files in the current directory?

How to install vim on CentOS 8 using dnf/yum

last updated May 13, 2020 in CentOS, Linux, Vim

I like VIM text editor a lot, and it is missing on my CentOS 8 box. How do I install vim on CentOS 8 Linux cloud server?

CentOS 8 add network bridge (br0) with nmcli command

last updated May 9, 2020 in CentOS, Linux, Networking

How do I configure my CentOS 8 and add network bridge (br0) with the nmcli command? How can I create a Linux network bridge on CentOS Linux 8 server for KVM (Kernel-based Virtual Machine)?

Nginx restore real IP address when behind a reverse proxy

last updated May 7, 2020 in BASH Shell, CentOS, Debian / Ubuntu, FreeBSD, Linux, Nginx, Suse, UNIX

Nginx restore real IP address when nginx server is behind a reverse proxy

My Nginx web server is behind a reverse proxy server. How do I restore the original and real IP address of my client/visitors when behind a reverse proxy server such as AWS Cloudfront, Fastly, Cloudflare CDN/WAF?

How to forcefully renew Let’s Encrypt certificate

last updated May 4, 2020 in CentOS, Cryptography, Debian / Ubuntu, FreeBSD, Linux, RedHat and Friends, Suse, UNIX

Forcefully renew Letsencrypt certificate for Nginx and Apache web server

How do I forcefully renew the Letsencrypt certificate on an Ubuntu, Debian, CentOS, RHEL, Fedora, or FreeBSD Unix systems?

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