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Bacula Backups
==================================================================================== Backup Server Setup (via automation) USEFUL LINKS: https://kb.ukfast.net/Backup_Server_Install https://linuxinstaller-man4.devops.ukfast.co.uk/dashboard/ https://linuxi...
QUICK GUIDE: Mail Troubleshooting
OOB Management - KVM & DRAC
==================================================================================== KVM ------------------------------------------------------------------------------------------------------------------------------------------ Useful Links: KVM KB ---...
ANS IPs
------------------------------------------------------------------------------------------------------------------------------------------------ Monitoring IPs (Zabbix): MAN4: 81.201.136.209 MAN5: 46.37.163.173 MAN5-Proxy: 46.37.163.133 81.201.136.192/2...
DNS Record Types
------------------------------------------------------------------------------------------------------------------------------------------------ CNAME (Canonical Name) Record: Links a domain to the A name record of another domain for ease of redirection. So...
Domain Transfers
------------------------------------------------------------------------------------------------------------------------------------------------ The below documents the ANS methodology for domain transfers - it's important to note that there will be process v...
DNS NameServer
==================================================================================== Changing Nameservers for a domain with ANS ANS Portal > Domains > Select Domain > NameServers ==============================================================================...
Changing WordPress Admin Password
The WordPress admin password can be changed via the WordPress database directly, or via WP-CLI: ==================================================================================== WP-CLI https://developer.wordpress.org/cli/commands/user/reset-password/ I...
WordPress Debug Mode
==================================================================================== WordPress Debug Mode WordPress comes with a built-in debugging feature, with a few options we can set for viewing debug logs. All of these changes are made within the wp-co...
Basic Usage
Installation https://docs.docker.com/engine/install/ 1. Configure Docker repo (See above link) 2. Install Docker CE (Community Edition) apt install docker.io Alternatively, there is a script to perform an automated installation of Docker; Again, see ab...
Compose
What is Docker Compose? Docker Compose is a tool used for defining and running multi-container Docker applications. It allows you to manage complex applications with multiple services (containers) using a simple YAML configuration file. With Docker Compose, y...
Ansible
What is Ansible? Ansible is an agentless automation system developed by RedHat, designed for deploying changes across any number of machines. --------------------------------------------------------------------------------------------------------------------...
What is automation?
Automation software is software that can be used to automate tasks - such as server configuration/deployment. ==================================================================================== Agent-based automation Automation that requires an agent (sof...
GIT - Version Control
What is GIT? Git is a free and open-source distributed version control system (DVCS) widely used for tracking changes in software development projects. It allows you to: Track Changes: Git keeps a record of all modifications made to your project files over...
Linux Boot Process
The below image outlines the typical flow of a Linux system boot. 1. BIOS (Basic Input/Output System) / UEFI (Unified Extensible Firmware Interface) When the system powers on, BIOS or UEFI is the first code that runs. BIOS/UEFI are responsible for checki...
Troubleshooting Boot Issues & System Recovery
System boot logs The below log files are most relevant to viewing boot logs and errors dmesg - Contains all boot data syslog/journal/messges - Logging post boot Recovery Options Alternative Kernel Firstly, it's worth ruling out a bad kernel file. W...
Hostname
Show current server hostname: hostname Show current server hostname, and other useful info: hostnamectl status example output: root@test:~# hostnamectl status Static hostname: test Icon name: computer-vm Chassis: vm Machine ID: ...
Partitions and Filesystems
Partitions What is a partition? Partitions allow you to divide a single physical disk into multiple, isolated sections. Each partition can be managed independently Partition types in Linux MBR- Master Boot Record The Master Boot Record (MBR) is a specia...
Disk Performance
==================================================================================== I/O Schedulers In Linux, the I/O scheduler is responsible for determining the order in which block I/O operations are submitted to storage devices. The scheduler affects the...
rSync
What is rSync? rSync is a file transfer command that can be used for both local and remote transfers. Remember to be careful with rSync - it's a synchronisation command and can overwrite files.example:I have 2 directories:/:directory1: |_>file1dire...