My Server Setup – Requirements
How to Extend Volume Group and Reduce Logical Volume
Logical Volume Extending
Currently, we have One PV, VG and 2 LV. Let’s list them one by one using following commands.
# pvs # vgs # lvs
Logical Volume Extending
Continue reading “Extend/Reduce LVM’s (Logical Volume Management) in Linux” »
cPanel is an online Linux-based web hosting control panel that provides a graphical interface and automation tools designed to simplify the process of hosting a web site or email.
Prerequisite:
Instructions:
Step 1: Set a valid hostname (FQDN) for your system. Note: Replace “your-hostname.example.com” with a FQDN.
hostname <your-hostname.example.com>
Step 2: Disable SELinux.
sed -i ‘s/SELINUX=enforcing/SELINUX=disabled/’ /etc/selinux/config
Step 3: Download and run the installation script. Tips: You may use the screen utility in case your session disconnects during installation.
cd /home && curl -o latest -L https://securedownloads.cpanel.net/latest && sh latest
Step 4: Wait for the installation to complete.
Step 5: While waiting for the installation, you might want to allow all the required ports on the security group for your instance (eg: WHM SSL, FTP, HTTP, HTTPS). Please follow the guide here.
Note: To know which ports are used by cPanel & WHM, please refer to this official documentation: https://documentation.cpanel.net/display/CKB/How+to+Configure+Your+Firewall+for+cPanel+Services
Step 6: Set a password for root.
passwd
Step 7: Browse to https://<your-server-ip>:2087 to access the WHM, and login as root.
Result:
Src: https://www.ipserverone.info/cloud/how-to-install-cpanel-on-centos-7/
MariaDB is an open-source relational database management system, backward compatible, binary drop-in replacement of MySQL. It is developed by some of the original developers of the MySQL and by many people in the community. With the release of CentOS 7, MySQL was replaced with MariaDB as the default database system.
If you, for any reason need to install MySQL, check the How to Install MySQL on CentOS 7 tutorial. If your application does not have any specific requirements, you should stick with MariaDB, the default database system in CentOS 7.
In this tutorial we will show you how to install the latest version of MariaDB on CentOS 7 using the official MariaDB repositories.
Prerequisites
Make sure you are logged in as a user with sudo privileges before proceeding with the tutorial.
Install MariaDB 5.5 on CentOS 7: The version of the MariaDB server provided in default CentOS repositories is version 5.5. This is not the latest version though, but it is quite stable.
Follow the steps below to install and secure MariaDB 5.5 on CentOS 7:
Install the MariaDB package using the yum package manager:
sudo yum install mariadb-server
Press y when prompted to proceed with the installation. Once the installation is complete, start the MariaDB service and enable it to start on boot using the following commands:
sudo systemctl start mariadbsudo systemctl enable mariadb
To verify that the installation was successful, check the MariaDB service status by typing:
sudo systemctl status mariadb
The output should show that the service is active and running: Continue reading “Install Mariadb on CentOS 7” »
For Ubuntu
To remove virtualbox
sudo dpkg --list virtualbox-* sudo apt autoremove --purge virtualbox* dpkg -l virtualbox* | grep ^i
Remove all PPAs from sources.list and source.list.d directory
mkdir ~/apt-tmp
sudo mv /etc/apt/sources.list.d/* ~/apt-tmp
Make sure there is nothing except official repositories sources in /etc/sources.list. And update your sources:
sudo apt update
Now we can search to see which versions are available to install:
apt-cache madison virtualbox | grep -iv sources
Which produces an output like this:
virtualbox | 5.0.32-dfsg-0ubuntu1.16.04.2 | http://mirrors.kernel.org/ubuntu xenial-updates/multiverse amd64 Packages virtualbox | 5.0.18-dfsg-2build1 | http://mirrors.kernel.org/ubuntu xenial/multiverse amd64 Packages
Then I would install the last version mentioned in xenial-updates: Continue reading “Reinstall VirtualBox on Ubuntu & CentOS” »
Download and Install the Iptables Service
To begin your server’s transition, you need to download and install the iptables-service package from the CentOS repositories. Download and install the service files by typing:
sudo yum install iptables-services
This will download and install the systemd scripts used to manage the iptables service. It will also write some default iptables and ip6tables configuration files to the /etc/sysconfig directory.
Construct your Iptables Firewall Rules
Next, you need to construct your iptables firewall rules by modifying the /etc/sysconfig/iptables and /etc/sysconfig/ip6tables files. These files hold the rules that will be read and applied when we start the iptables service.
How you construct your firewall rules depends on whether the system-config-firewall process is installed and being used to manage these files. Check the top of the /etc/sysconfig/iptables file to see whether it recommends against manual editing or not:
sudo head -2 /etc/sysconfig/iptables
If the output looks like this, feel free to manually edit the /etc/sysconfig/iptables and /etc/sysconfig/ip6tables files to implement the policies for your iptables firewall:
output # sample configuration for iptables service # you can edit this manually or use system-config-firewall
Open and edit the files with sudo privileges to add your rules:
sudo nano /etc/sysconfig/iptables sudo nano /etc/sysconfig/ip6tables
After you’ve made your rules, you can test your IPv4 and IPv6 rules using these commands:
sudo sh -c 'iptables-restore -t < /etc/sysconfig/iptables' sudo sh -c 'ip6tables-restore -t < /etc/sysconfig/ip6tables'
If, on the other hand, the output from examining the /etc/sysconfig/iptables file looks like this, you should not manually edit the file: Continue reading “Disable FirewallD and Enable Iptables on CentOS 7” »
Before we proceed with Zimbra Collaboration Suite installation process, first login to your server console with root privileges and install the following packages:
# yum -y install unzip net-tools sysstat openssh-clients perl-core libaio nmap-ncat libstdc++.so.6 perl perl-core ntpl nmap sudo libidn gmp libaio libstdc++ unzip sqlite dnsmasq
Next, issue getenforce command to check if Selinux in enabled on your machine. In case the policy is set to Enforced disable it by issuing the below commands:
# getenforce # setenforce 0 # getenforce
To completely disable Selinux on CentOS, open /etc/selinux/config file with a text editor and set the line SELINUX to disabled.
Assure that wget system utility is also installed on your system by issuing the following command:
# yum install wget
In order for Zimbra to function correctly you must set the local machine hostname and FQDN to point to your server IP Address by running the below commands from root account:
# hostnamectl set-hostname mail # echo "192.168.0.14 mail.centos7.lan mail " >> /etc/hosts # cat /etc/hosts
Replace the system hostname and FQDN values accordingly in order to match your own domain settings. Test the hostname and FQDN values by issuing the ping command against both records. Continue reading “Zimbra 8.8 on CentOS 7” »
Step 1 – Add Required Yum Repositories
Firstly you are required to add VirtualBox yum repository in your system. Download repository file from its official site and place it under at /etc/yum.repos.d/virtualbox.repo .First navigate to /etc/yum.repos.d/ directory and use one of below commands as per your operating system.
cd /etc/yum.repos.d/ wget http://download.virtualbox.org/virtualbox/rpm/rhel/virtualbox.repo
The CentOS and RedHat users also required to add EPEL yum repository using one of the following commands.
### On CentOS/RHEL 7 ### rpm -Uvh http://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
### On CentOS/RHEL 6 ### rpm -Uvh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
Step 2 – Install Required Packages
Before installing VirtualBox make sure to install all required packages to run VirtualBox like kernel-headers, kernel-devels etc. Use the following command to install the required packages. Continue reading “Install VirtualBox on Centos 6 / 7” »
Let’s install NTP service first:
yum install ntp
Configure NTP services by updating the following section (only if appropriate):
nano /etc/ntp.conf
And by commenting on the sections:
# Use public servers from the pool.ntp.org project. # Please consider joining the pool (http://www.pool.ntp.org/join.html). #server 0.centos.pool.ntp.org iburst #server 1.centos.pool.ntp.org iburst #server 2.centos.pool.ntp.org iburst #server 3.centos.pool.ntp.org iburst
In my case I used the following National Time Server of Bangladesh:
server bsti1.time.gov.bd server bsti2.time.gov.bd
save and restart the ntp service.
Change Timezone on a CentOS 6 and 7
How do I see the current time zone on CentOS Linux?
Type the date command or the ls command:
$ date $ ls -l /etc/localtime
Another option is to type the following command on systemd based distro such as CentOS 7 to see timezone along with the grep command and timedatectl command: Continue reading “Installing NTP Service and change timezone in CentOS 6 / CentOS 7” »
UPDATE THE SYSTEM
Before going any further, make sure you’re in a screen session and your system is fully up-to-date by running:
## screen -U -S opendkim-screen ## yum update
ENABLE EPEL REPOSITORY
OpenDKIM is available in the EPEL repository, so we need to enable it on the system before we can install OpenDKIM
## wget -P /tmp http://mirror.pnl.gov/epel/6/i386/epel-release-6-8.noarch.rpm ## rpm -Uvh /tmp/epel-release-6-8.noarch.rpm ## rm -f /tmp/epel-release-6-8.noarch.rpm
INSTALL OPENDKIM
Install the package using yum:
## yum install opendkim
CONFIGURE OPENDKIM
Next thing to do is to configure OpenDKIM. Its main configuration file is located in /etc/opendkim.conf, so before making any changes create a backup and add/edit the following: Continue reading “Install and integrate DKIM with OpenDKIM and Postfix on a CentOS 6” »
Step One— Create a New Directory
The first step in creating a virtual host is to a create a directory where we will keep the new website’s information.
This location will be your Document Root in the Apache virtual configuration file later on. By adding a -p to the line of code, the command automatically generates all the parents for the new directory.
sudo mkdir -p /var/www/example.com/public_html
You will need to designate an actual DNS approved domain, or an IP address, to test that a virtual host is working. In this tutorial we will use example.com as a placeholder for a correct domain name.
However, should you want to use an unapproved domain name to test the process you will find information on how to make it work on your local computer in Step Six.
Step Two—Grant Permissions
We need to grant ownership of the directory to the user, instead of just keeping it on the root system.
sudo chown -R apache:apache /var/www/example.com/public_html
Additionally, it is important to make sure that everyone will be able to read our new files.
sudo chmod 755 /var/www
Now you are all done with permissions. Continue reading “Apache Virtual Hosts on CentOS” »
