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How to Install Iptables on CentOS 7
Prerequisites
Before starting with the tutorial, make sure you are logged in as a user with sudo privileges.
Disable FirewallD
To disable firewalld on your system follow these steps:
- Type the following command to stop the FirewallD service:
sudo systemctl stop firewalld - Disable the FirewallD service to start automatically on system boot:
sudo systemctl disable firewalld - Mask the FirewallD service to prevent it from being started by another services:
sudo systemctl mask --now firewalld
Install and Enable Iptables
Perform the following steps to install Iptables on a CentOS 7 system:
- Run the following command to install the
iptables-servicepackage from the CentOS repositories:sudo yum install iptables-services - Once the package is installed start the Iptables service:
sudo...
Scanning for malware with Linux Malware Detect (LMD)
Linux Malware Detect (LMD), also known as Maldet, is a malware scanner for Linux released under the GNU GPLv2 license. It is particularly effective for the detection of php backdoors, darkmailers and many other malicious files that can be uploaded on a compromised website. It will help you do detect infected websites and clean the infection, however securing the compromised user or website is still necessary to avoid re-infection.
If the server has cPanel , we recommend you install ClamAV first, as maldet will use the ClamAV scan engine. ClamAV installation instructions are available here.
You will need to be logged in as root to the server over SSH.
1 - Install maldet
cd /usr/local/src/ && wget http://www.rfxn.com/downloads/maldetect-current.tar.gz && tar -xzvf maldetect-current.tar.gz && cd maldetect-* && sh install.shThis will automatically install a cronjob inside /etc/cron.daily/maldet so a daily...
Change the current timezone in CentOS
Type the following commands as root:
cp /etc/localtime /root/old.timezone
rm /etc/localtime
ln -s /usr/share/zoneinfo/America/Chicago /etc/localtime
Verify new settings by typing the following two commands:
date
ls -l /etc/localtime
Thats it :)...
Find and replace text within a file using commands on Linux
How can I find and replace specific words in a text file using command line?
cd /path/to/your/folder/nikeshshakya
sed -i 's/original/new/g' file.txt
Explanation:
sed = Stream EDitor
-i = in-place (i.e. save back to the original file)
The command string:
s = the substitute command
original = a regular expression describing the word to replace (or just the word itself)
new = the text to replace it with
g = global (i.e. replace all and not just the first occurrence)
file.txt = the file name
Or to make replace on all files on folder
cd /path/to/your/folder/nikeshshakya
sed -i 's/foo/bar/g' *...