You will need to start with a sparse install of CentOS available. For virtualization providers, find a very minimal instance type to use.
There are two different conditions where it should be possible to concert Centos to ClearOS:
cat \etc\centos-release
then use the first update method.sudo su - # unnecessary if you are already running as root
yum -y remove NetworkManager
# Set SELinux to disabled
sed -i 's/=enforcing/=disabled/' /etc/selinux/config
setenforce 0
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 and possibly, clearos-centos-updates.
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-*
rm -rf /var/cache/yum/
rpm -ivh --nodeps system-base-*.rpm
yum install clearos-release-*.rpm
yum reinstall app-base-*
rm -rf /var/cache/yum/
yum reinstall system-base
yum reinstall clearos-release
rm -rf /var/cache/yum/
rm -f *.rpm
systemctl stop webconfig
passwd
# Run updates to basics and fixup nameserver then finish updates
yum -y update app-base
rm -rf /var/cache/yum/ && yum -y update
rm -rf /var/cache/yum/
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 --enablerepo=clearos-epel
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
# Needed on Linode or possibly other installations, but not when converting from a centos iso install in a vm
# In the Linode Console > Disks/Configs edit the current configuration profile and turn off "autoconfigure networking" then:
#### Begin Linode bit
echo "DEVICE=eth0" > /etc/sysconfig/network-scripts/ifcfg-eth0
echo "TYPE=\"Ethernet\"" >> /etc/sysconfig/network-scripts/ifcfg-eth0
echo "ONBOOT=\"yes\"" >> /etc/sysconfig/network-scripts/ifcfg-eth0
echo "USERCTL=\"no\"" >> /etc/sysconfig/network-scripts/ifcfg-eth0
echo "BOOTPROTO=\"dhcp\"" >> /etc/sysconfig/network-scripts/ifcfg-eth0
echo "PEERDNS=\"no\"" >> /etc/sysconfig/network-scripts/ifcfg-eth0
echo "nameserver 8.8.8.8" > /etc/resolv-peerdns.conf
echo "nameserver 8.8.4.4" >> /etc/resolv-peerdns.confreboot
#### End Linode bit
reboot
sudo su - # unnecessary if you are already running as root
yum -y remove NetworkManager
sed -i 's/=enforcing/=disabled/' /etc/selinux/config
setenforce 0
mkdir -p /tmp/rpms
cd /tmp/rpms/
curl -LO https://mirror1-newyork.clearos.com/clearos/7/updates/x86_64/RPMS/$(curl -s https://mirror1-newyork.clearos.com/clearos/7/updates/x86_64/RPMS/|grep -oh system-base-[0-9]+*.*.rpm\"|grep -oh system-base-[0-9]+*.*.rpm)
curl -LO https://mirror1-newyork.clearos.com/clearos/7/updates/x86_64/RPMS/$(curl -s https://mirror1-newyork.clearos.com/clearos/7/updates/x86_64/RPMS/|grep -oh clearos-release-[0-9]+*.*.rpm\"|grep -oh clearos-release-[0-9]+*.*.rpm)
curl -LO https://mirror1-newyork.clearos.com/clearos/7/updates/x86_64/RPMS/$(curl -s https://mirror1-newyork.clearos.com/clearos/7/updates/x86_64/RPMS/|grep -oh app-base-core-[0-9]+*.*.rpm\"|grep -oh app-base-core-[0-9]+*.*.rpm)
curl -LO https://mirror1-newyork.clearos.com/clearos/7/updates/x86_64/RPMS/$(curl -s https://mirror1-newyork.clearos.com/clearos/7/updates/x86_64/RPMS/|grep -oh app-base-[0-9]+*.*.rpm\"|grep -oh app-base-[0-9]+*.*.rpm)
rpm -ivh --nodeps app-base-*
rm -rf /var/cache/yum/
rpm -ivh --nodeps system-base-*.rpm
yum install clearos-release-*.rpm
yum reinstall app-base-* --enablerepo=clearos-centos,clearos-centos-updates
rm -rf /var/cache/yum/
yum reinstall system-base
yum reinstall clearos-release
rm -rf /var/cache/yum/
rm -f *.rpm
systemctl stop webconfig
# Set a root password so that you can login to Webconfig. may already be done so should be unnecessary
passwd
# Run updates to basics and fixup nameserver then finish updates
yum -y update app-base # may find nothing to do
rm -rf /var/cache/yum/ && yum -y update --enablerepo=clearos-centos,clearos-centos-updates
rm -rf /var/cache/yum/
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 --enablerepo=clearos-epel
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
# Needed on Linode or possibly other installations, but not when converting from a centos iso install in a vm
# In the Linode Console > Disks/Configs you may want to edit the current configuration profile and turn off "autoconfigure networking". Then:
#### Begin Linode bit
echo "DEVICE=eth0" > /etc/sysconfig/network-scripts/ifcfg-eth0
echo "TYPE=\"Ethernet\"" >> /etc/sysconfig/network-scripts/ifcfg-eth0
echo "ONBOOT=\"yes\"" >> /etc/sysconfig/network-scripts/ifcfg-eth0
echo "USERCTL=\"no\"" >> /etc/sysconfig/network-scripts/ifcfg-eth0
echo "BOOTPROTO=\"dhcp\"" >> /etc/sysconfig/network-scripts/ifcfg-eth0
echo "PEERDNS=\"no\"" >> /etc/sysconfig/network-scripts/ifcfg-eth0
echo "nameserver 8.8.8.8" > /etc/resolv-peerdns.conf
echo "nameserver 8.8.4.4" >> /etc/resolv-peerdns.confreboot
#### End Linode bit
reboot
#!/bin/bash -x
(
ARCH=`arch`
# Prep release and repos
rpm -Uvh http://download2.clearsdn.com/marketplace/cloud/7/noarch/clearos-release-7-current.noarch.rpm
rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-ClearOS-7
# Install and upgrade
yum --enablerepo=* clean all
yum --enablerepo=clearos-centos -y install app-base
yum --enablerepo=* clean all
service webconfig stop
yum --enablerepo=clearos-centos -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
# Default networking
yum -y remove NetworkManager
echo "DEVICE=eth0" > /etc/sysconfig/network-scripts/ifcfg-eth0
echo "TYPE=\"Ethernet\"" >> /etc/sysconfig/network-scripts/ifcfg-eth0
echo "ONBOOT=\"yes\"" >> /etc/sysconfig/network-scripts/ifcfg-eth0
echo "USERCTL=\"no\"" >> /etc/sysconfig/network-scripts/ifcfg-eth0
echo "BOOTPROTO=\"dhcp\"" >> /etc/sysconfig/network-scripts/ifcfg-eth0
echo "PEERDNS=\"no\"" >> /etc/sysconfig/network-scripts/ifcfg-eth0
echo "nameserver 8.8.8.8" > /etc/resolv-peerdns.conf
echo "nameserver 8.8.4.4" >> /etc/resolv-peerdns.conf
sed -i -e 's/^GATEWAYDEV=.*/GATEWAYDEV="eth0"/' /etc/sysconfig/network
sed -i -e 's/^EXTIF=.*/EXTIF="eth0"/' /etc/clearos/network.conf
service syswatch restart
# Enable firewall
allow-port -p TCP -d 22 -n SSH
allow-port -p TCP -d 81 -n Webconfig
sed -i -e 's/^MODE=.*/MODE="standalone"/' /etc/clearos/network.conf
# Start webconfig
service webconfig start
) 2>&1 | tee /var/log/clearos-installer.log
# Reboot
reboot
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