Server

SMTP - Sending from email client(eg:outlook) to email server.
IMAP & POP - Receiving email from email server.

For example, if your email server is gmail.com but your email claims to be sent from your website’s domain, your form notification may be blocked before it even reaches the spam folder.

Configuring SSH Key

https://www.siteground.com/kb/log-siteground-shared-account-via-ssh-using-putty/

Github

Issue: permission denied to my own repo

Solution: The error is that ur computer has saved a git username and password so if you shift to another account the error 403 will appear. Below is the solution
For Windows you can find the keys here:
control panel > user accounts > credential manager > Windows credentials > Generic credentials
Next remove the Github keys.

Nmap

The Nmap aka Network Mapper is an open source and a very versatile tool for Linux system/network administrators. Nmap is used for exploring networks, perform security scans, network audit and finding open ports on remote machine. It scans for Live hosts, Operating systems, packet filters and open ports running on remote hosts.

Install Namp on the machine if not exists

Scan using Hostname
nmap server2.tecmint.com

manage DNS zone files

https://in.godaddy.com/help/manage-dns-zone-files-680
Every network device or interface, such as your laptop's Wi-Fi adapter, has a unique hardware ID called the MAC (or "media access control") address. *ipconfig /all *Find your adapter's physical address. Scroll down to your network adapter and look for the values next to "Physical Address," which is your MAC address.

Google Crawl

Crawling is the process by which Googlebot discovers new and updated pages to be added to the Google index. Google search console - to test https://www.google.com/webmasters/tools/ https://www.google.com/webmasters/tools/googlebot-fetch?hl=en&siteUrl=https://fletcherchiropracticllc.com/

Cron Job

Backup databases using cron jobs: https://www.youtube.com/watch?v=hrbGIaMpOC0 Linux Basics -- Scheduling Tasks with Cron https://www.youtube.com/watch?v=8j0SWYNglcw

DNS

https://in.godaddy.com/help/manage-dns-zone-files-680 https://www.inmotionhosting.com/support/website/how-to/modifying-your-hosts-file https://www.inmotionhosting.com/support/domain-names/dns-nameserver-changes/what-is-a-name-server Nameservers: Nameservers are part of DNS, which stands for “Domain Name System.” The DNS is a database that works like a phone book for computers: it converts a domain name, such as “www.example.com,” to a machine-readable IP address, such as “22.231.113.64.” The DNS is maintained by several organizations, including IANA (Internet Assigned Numbers Authority) and ICANN (Internet Corporation for Assigned Names and Numbers). *What do DNS requests to name servers look like? But just how exactly did your computer know what webpage to display for you, and what server to pull it from? -Your web-browser knows you typed InMotionHosting.com into the address bar. -Your computer then uses DNS to retrieve the current nameservers for InMotionHosting.com. -Our public nameservers; ns1.inmotionhosting.com and ns2.inmotionhosting.com are retrieved. -Your computer asks our nameservers for the A (address) record for InMotionHosting.com. -Our public nameservers respond back with the IP address 192.145.237.216 -Your computer sends a request to that IP address along with the page you're requesting. -Our web server hosting InMotionHosting.com then sends your web-browser the requested page. *Check nameservers info from command prompt -In Windows click on Start, in the Search programs and files field type in cmd, then hit Enter. -Type: nslookup -Type: set q=NS -Type: domain name(inmotionhosting.com)

SUDO

How To Obtain Root Privileges There are three basic ways to obtain root privileges, *Log In As Root: -The simplest and most straight forward method of obtaining root privileges is simply to log into your server as the root user from the onset. ssh root@server_domain_or_IP *Use "su" to Become Root: -Logging in as root is usually not recommended, because it is easy to begin using the system for non-administrative tasks, which is dangerous. -The next way to gain super-user privileges allows you to become the root user at any time, as you need it. -We can do this by invoking the su command, which stands for "substitute user". To gain root privileges, simply type: su *Use "sudo" to Execute Commands as Root -The final, and most complex, way of obtaining "root privileges" that we will discuss is with the sudo command. -The sudo command allows you to execute one-off commands with root privileges, without the need to spawn a new shell. It is executed like this: sudo command_to_execute -Unlike su, the sudo command will request the password of the user calling the command, not the root password. -Because of its security implications, sudo access is not granted to users by default, and must be set up before it functions correctly. sudo visudo /etc/sudoers Every sudoers file will have the following line: root ALL=(ALL) ALL This permits the root user on ALL hosts using ALL users to execute ALL commands. ALL is a special value in the sudoers file meaning “no restrictions.” For more control, you could add a line like the following, which would only permit the “alexander” user to run apt-get update. alexander ALL=(ALL) /usr/bin/apt-get update Put a “%” in front of the user, and it will define a group.
Need to run in a normal terminal not inside mysql. Backup a Single MySQL Database: mysqldump -u root -p database_name > database_name.sql If you are logged in as the same user that you are using to perform the export and that user does not require a password, you can omit the -u and -p options: mysqldump database_name > database_name.sql The backup will be stored in the path or folder from where you run the mysql command Import a Single MySQL Database: mysql -u ortholin_dbuser -p ortholin_ortholin_joomla_new < backup_ortholin_joomla3_140319.sql; --------- POINTING EXTERNAL DOMAIN TO HOST: 1. Modify the A record on the domain to point the Host. 2. Create ADDON DOMAIN with the name of the 'domain' on the host. --------- Sucuri - Website Firewall - Domain pointed to Sucuri IP. - Sucuri pointed to Host IP. ping in linux for additional info.