Some hosting providers such as Linode only provide Centos images and not ClearOS. It is possible to convert a Centos installation to ClearOS following these instructions. You will need to start with the most sparse install of CentOS available. For virtualization providers, find a very minimal instance type to use.

sudo su -
yum -y remove NetworkManager
# Set SELinux to disabled
sed -i 's/=enforcing/=disabled/' /etc/selinux/config
reboot

It can be difficult to get business installed on a CentOS system that comes via a virtual platform like AWS because many of them run updates which will give you a very advanced version and depending on the update cycle, you may not be able to update unless you enable repos. When stuck, find the equivalent step in ClearOS community and run yum with –enablerepo=clearos-updates,clearos-centos.

sudo su -
mkdir -p /tmp/rpms
cd /tmp/rpms/
curl -LO http://mirror1-newyork.clearos.com/clearos/7/os/x86_64/Packages/$(curl -s http://mirror1-newyork.clearos.com/clearos/7/os/x86_64/Packages/|grep -oh system-base-[0-9]+*.*.rpm\"|grep -oh system-base-[0-9]+*.*.rpm)
curl -LO http://mirror1-newyork.clearos.com/clearos/7/os/x86_64/Packages/$(curl -s http://mirror1-newyork.clearos.com/clearos/7/os/x86_64/Packages/|grep -oh clearos-release-[0-9]+*.*.rpm\"|grep -oh clearos-release-[0-9]+*.*.rpm)
curl -LO http://mirror1-newyork.clearos.com/clearos/7/os/x86_64/Packages/$(curl -s http://mirror1-newyork.clearos.com/clearos/7/os/x86_64/Packages/|grep -oh app-base-core-[0-9]+*.*.rpm\"|grep -oh app-base-core-[0-9]+*.*.rpm)
curl -LO http://mirror1-newyork.clearos.com/clearos/7/os/x86_64/Packages/$(curl -s http://mirror1-newyork.clearos.com/clearos/7/os/x86_64/Packages/|grep -oh app-base-[0-9]+*.*.rpm\"|grep -oh app-base-[0-9]+*.*.rpm)
rpm -ivh --nodeps app-base-*
yum --enablerepo=* clean all
rpm -ivh --nodeps system-base-*.rpm
yum install clearos-release-*.rpm
yum reinstall app-base-*
yum --enablerepo=* clean all
yum reinstall system-base
yum reinstall clearos-release
yum --enablerepo=* clean all
rm -f *.rpm
systemctl stop webconfig

In the clearos-centos.repo modify the enabled value:

yum-config-manager enable clearos-centos

This only works if your minimal installation has yum-config-manager. If not you have to do a manual edit:

vi /etc/yum.repos.d/clearos-centos.repo

If you don't get on with vi, try with the editor “nano” which may be installed.

Set a root password so that you can login to Webconfig

passwd

Run updates to basics and fixup nameserver then finish updates

yum --enablerepo=* clean all && yum -y update app-base
yum --enablerepo=* clean all && yum -y update
yum --enablerepo=* clean all
echo "nameserver 8.8.8.8" > /etc/resolv.conf
yum -y install app-accounts app-configuration-backup app-dashboard app-date app-dns app-edition app-events app-incoming-firewall app-groups app-language app-log-viewer app-mail app-marketplace app-process-viewer app-software-updates app-ssh-server app-support app-user-profile app-users
systemctl restart syswatch
allow-port -p TCP -d 22 -n SSH
allow-port -p TCP -d 81 -n Webconfig
systemctl start webconfig
systemctl enable webconfig
reboot