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==================================================================================== WP-CLI Installation guide ------------------------------------------------------------------------------------------------------------------------------------------------ D...

------------------------------------------------------------------------------------------------------------------------------------------------ Logging interval To change ATOP's logging interval edit the below file: vim /usr/share/atop/atop.daily In here,...

==================================================================================== Client chowned their server? did you chown a clients server? Never fear, facl is here. https://kb.ukfast.net/Linux_file_permissions ========================================...

==================================================================================== FHS as defined by RedHat: ------------------------------------------------------------------------------------------------------------------------------------------------ /...

==================================================================================== LVM, or Logical Volume Manager, is a tool used on Linux systems to manage disk space in a more flexible way compared to traditional partitioning. It acts like a layer of abst...

==================================================================================== This page details the storage concepts for a linux system. ------------------------------------------------------------------------------------------------------------------...

==================================================================================== CHROOT (Changed Root) Jail CHROOT essentially means that a user or application has it's root changed, essentially locking it away from the rest of the server filesystem. ...

Line Numbers vim can display line numbers using the below command: :set number Skip to specific line number To skip to line 255: :255 ------------------------------------------------------------------------------------------------------------------------...

==================================================================================== FIND Find is a linux search tool that can be used to find a variety of files based on the given criteria. ------------------------------------------------------------------...

==================================================================================== gzip   ==================================================================================== tar (.tar) - Tape Archive Take multiple files and compress them into a single ...

Pluggable Authentication Modules (PAM) PAM is essentially an authentication system that allows for different modules to be added for support of different authentication methods, as an example; 2fa would be handled by PAM on a Linux system. /etc/security/ ==...

==================================================================================== Linux File Permissions Every file in Linux has permissions, these define which actions can be undertaken by the user,group, and other. As seen on the file below, permission...

Locale In Linux, a locale is a set of environment variables that defines the language, country, and character encoding settings for a user's environment. Locales affect various aspects of a program's behavior, such as the way dates and times are displayed, th...

View current RAM configuration lsmem View current RAM usage (human readable) free -h Older systems might not like -h, you can also run the command without it.

==================================================================================== SSL Validation   ----------------------------------------------------------------------------------------------------------------------------------------------- CNAME DNS V...

------------------------------------------------------------------------------------------------------------------------------------------------ Quick fixes DCV Required Port: 53 UDP   AutoSSL detecting an internal IP? Check using cpdig command: /scripts/...

==================================================================================== Online Tools There are various online tools which can be used for SSL validation, here are a few:   SSL Checker   WhyNoPadlock   QuaysSSL lab   -------------------------...

ANS Portal > Servers > Load Balancers Services: haproxy   Warden  /var/log/warden/warden.log   Keepalived – manages which side of lb the IPs are located on                                    /var/log/syslog 

https://rpms.remirepo.net/wizard/ 

------------------------------------------------------------------------------------------------------------------------------------------------ FOR LOOPS For loops are a fundamental programming construct used to execute a block of code repeatedly. They are ...