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==================================================================================== 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. FILE BLOCK In a block storage system, you can break the data into independent fixed-size blocks or pieces. Each block is an individual piece of data storage. A complete piece of information, suc...

==================================================================================== 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. ...

VIM is the best Linux text editor. i insert. A insert at the end of the current line. I insert at the beginning of the current line. o Insert on line below. O Insert on line above.5784/*/ :set number display line numbers...

FIND Find is a linux search tool that can be used to find a variety of files based on the given criteria. find [options] {search location} {search criteria} [actions] OPTION Function -type  Specify the file type for the search. Either f or d....

==================================================================================== 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 Ownership Files and directories in Linux are owned by a user and a group. chown The chown command can be used to set or change the user or group associated with ownership of the file. To change only the owner of a file; chown username filename ...

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 ...

Bextract 1. Get list of volumes from TechDB To get an idea of what files you'll need, you need to examine the TechDB Backups tab. For each backup, a line will be printed which starts "Volume name(s):" - this should be in the following format: srv-7813711322...

==================================================================================== XMLRPC Identifying the total number of xmlrpc requests: grep -i 'xmlrpc' /path/to/access/log | cut -d ':' -f1 | sort | uniq -c | wc -l ------------------------------------...