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Knowledgebase : CentOS Linux Server
SSH Port for Dedicated Server and VPS
SSH Port for Dedicated Server: 55000 SSH Port for VPS Server: 44200
7 Extremely Useful Linux Commands
#1: LS : WHAT’S IN THIS DIRECTORY? The command LS stands for LIST DIRECTORY CONTENTS. And, cleverly, it will do just that: list a directory's contents! Using it with -F will give a list of the directories contents, and denote items that are other direct...
Change permissions using find command
On a Linux server, if you are in need of changing the permissions of a bulk amount of files or directories recursively, we can use 'find' command to do it. The steps are explained below: * Change to the directory in which you need to change the permiss...
Check Server hack and exim spamming
This will probably help you to find out the IP which tried the malpractices in a server to get compromised. First, we can try to find the IP which I need to monitor 1. This netstat script will list out the number of connections made by an IP > NETST...
Enable Root Login via SSH
By default SSH comes configured in a way that disables root user logins. This is done as a security precaution and means that you cannot directly login as the root user over SSH. However you can usually get around the need for root ssh login by using the ...
How can I block bots, spiders and crawlers
HOW TO BLOCK BOTS USING ROBOTS.TXT FILE? The robots.txt file is a simple text file placed on your web server which tells web crawlers that if they should access a file or not. The robots.txt file controls how search engine spiders see and interact with y...
How to setup your remote access key in WHM.
HOW TO SETUP YOUR REMOTE ACCESS KEY IN WHM. This demo assumes you've already logged in to WebHost Manager (WHM). Now let's learn how to setup a remote access key. A remote access key is what's needed if you want to have a script automatically connect ...
HOW TO: Allow Port 26 for SMTP in IPtables
Please take note that Malaysia and in some countries, or better said some ISPs are now blocking SMTP Port 25 to mitigate Spam in their network. An approach lots of systems administrators are taking is to use port 26, so you can configure your email clie...
HOW TO: Block all ports in IPtables
Here we provide sample of most popular iptables configuration. We will block all connections except specific ports First of all to exclude any errors because of previous config we will delete all current iptables rules. SSH to your server with root ...
HOW TO: Change SSH Port
HOW TO CHANGE SSH PORT. Open the file _/etc/ssh/sshd_config_ with your favourite text editor. For example: nano /etc/ssh/sshd_config Find the string which defines the port and edit it: # What ports, IPs and protocols we listen for Port 22 Now resta...
HOW TO: Change the root directory of Primary domain with .htacces...
If you have a website installed for the primary domain of your hosting account, by default your website is loaded from the public_html folder. Public_html is the root folder for the primary domain and is also called web root folder or document root direct...
HOW TO: Change the root password via WHM
To change the root password for your VPS or Dedicated server via WHM: 1. Log into WHM. 2. Go to SERVER CONFIGURATION > CHANGE ROOT PASSWORD menu. 3. Enter the new password in NEW ROOT PASSWORD and CONFIRM PASSWORD fields (you may use built-in Password G...
HOW TO: Check if IP is blocked from IPtables
CHECKING IF AN IP IS BLOCKED IN IPTABLES Check if IP is blocked: > iptables -L -n --line | grep [IP Address] If IP appear as DROP or REJECT, the IP has been blocked Unblock the IP Address: > iptables -I INPUT -s [IP Address] -j ACCEPT Blocking ba...
HOW TO: Check memory usage on a Linux server
I) CPANEL/WHM There are a few ways to check your memory usage in WHM or cPanel control panels. You may check the general overview of the server status via WHM > Server Information and WHM > Service Status, which also includes information about memory usa...
HOW TO: Check the Version of cPanel / WHM
METHOD #1: CHECKING THE VERSION OF CPANEL / WHM BY THE ‘CPANEL’ COMMAND Using the cPanel command: /usr/local/cpanel/cpanel -V 11.50.0 (build 27) METHOD #2: CHECKING THE VERSION OF CPANEL / WHM BY LOOKING AT THE VERSION FILE Using the version file:...
HOW TO: Install and setup Fail2Ban in Centos Server
ABOUT FAIL2BAN Fail2Ban is a widely used tool for protecting the bruteforce attack analyzing the server log files. This will help us to automatically protect the server from malicious login attempts. INSTALLING FAIL2BAN Usually the default Centos Yu...
HOW TO: Remove (Delete) a User on CentOS 7
THESE INSTRUCTIONS ARE INTENDED SPECIFICALLY FOR REMOVING A USER ON CENTOS 7. STEP 1: DELETE THE USER It's just one simple command to add a user. In this case, we're adding a user called mynewuser: userdel mynewuser If you want to remove all of th...
HOW TO: Repair MySQL databases and tables
STEP 1: BACKING UP THE DATABASES Before you attempt to repair any database, you should back it up first. To back up all of the files from all of your databases, follow these steps: * Log in to your server using SSH. * Stop the MySQL server using th...
HOW TO: Securely Transfer Files via rsync and SSH on Linux
USE THESE COMMANDS TO SECURELY _DOWNLOAD FROM_ A SERVER STANDARD SSH PORT: rsync -avHe ssh _user_@_server_:_/path/to/file_ _/home/user/path/to/file_ * USER: The username of the remote user through which you'll be logging into the target (remote) se...
HOW TO: SSH using PuTTY / SSH Ports
HOW TO SSH TO THE SERVER DO NOTE: For our servers, we use SSH PORT: 44200 (VPS) AND (55000) FOR OUR DEDICATED SERVERS (DS) for security reasons. DOWNLOAD PUTTY Use the following steps to download and open PuTTY: * Download PuTTY from the PuTTY w...
HOW TO: Test Apache and PHP configuration
HOW TO TEST THE APACHE AND PHP CONFIGURATION Q. HOW CAN I BE SURE THAT MY PHP SERVER IS WORKING? AND HOW TO KNOW THE VERSION AND MODULES ENABLED? A. You can create a simple PHP script and load it from your browser in order to know the version of PHP an...
Maldet (LMD) commands and examples.
MALDET (LINUX MALWARE DETECT):- Maldet is a malware detector which is mainly used in Linux based servers. It uses threat data from network edge intrusion detection systems to extract malware that is actively being used in attacks and generates signatures...
Managing Databases with Command Line SSH
Using SSH can be a superior way to manage the files and databases on your account. Using a simple command you can import or export a MySQL database into an existing database on your account. Please note that in the examples below the -P will prompt for ...
NGINX rewrite rules for WordPress multisite
In order to deploy WordPress multisite, the following directives should be added to DOMAINS > EXAMPLE.COM > APACHE & NGINX SETTINGS > ADDITIONAL NGINX DIRECTIVES: > # WordPress multisite subdirectory rules. > index index.php; > > # This order might s...
Overview of the Vim Text Editor
Many articles in this knowledge base advise editing configuration files. We usually recommend using your preferred text editor. At Liquid Web, we prefer vim. Vim, or its older sibling vi, are installed by default on nearly every server that we come across...
Postfix Queue Management
TO FIND WHICH MAILS ARE STUCK IN MAIL QUEUE AND WHY? If emails are getting delayed, its better to inspect postfix mail queues, coupled with postfix mail log. STATUS/SHAPE OF MAIL QUEUE Postfix maintains different queues for different purpose.active a...
Practice Safe Passwords: A Quick Guide to Password Security
Your server is only as secure as your weakest password. As a rule of thumb, the more lengthy and complex a password, the stronger it is. Follow the best practices below for generating difficult to crack passwords. Best Practices DOS * DO USE PASSWO...
Script to Fix cPanel Account Permissions
This is a simple bash script to fix the permissions and ownership of files within a cpanel account. To use, simply copy the script your server, chmod 755, and pass the usernames as arguments: > ./fixperms user1 user2 user3 You can also run a server-wid...
Server Hard Disk Full? A Quick Guide
Hi, For server administrators, it is essential to maintain your server upkeep in term of the hard disk space. When the server hard disk is full, there will be a serious downtime that will happen to your server. The most important sign when the hard di...
What are the most commonly used ports? (cPanel)
When configuring your server settings, you may be asked to enter a specific port number for a particular application or service. Here's a list of commonly requested port numbers you can use with your server: * HTTP - Port 80 * HTTPS - 443 * FTP - ...
What is a BRUTE-FORCE ATTACK?
Brute-Force Attacks occur when an attacker attempts to calculate every possible combination that could make up a password and test against your site to see if it is a correct password. This can be done either by using dictionary words or trying to guess t...
What is my VPS or Dedicated Server SSH port?
WHAT IS MY VPS OR DEDICATED SERVER SSH PORT? - Dedicated and VPS customers automatically have root SSH access. Root shell allows you to change anyone and anything on your server. By default, all our VPS SERVERS use PORT NUMBER 44200 for SSH access. ...
What is RAID?
The Redundant Array of Inexpensive Disks or RAID, is a robust method of storing data efficiently. It uses techniques like striping, mirroring, and parity to utilize multiple hard drives combined into larger volumes. RAID serves two main purposes, it can...
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