This section explains how to prepare a running Linux system (cloud instance, virtual machine, or a system running on bare metal) before importing it for use in Eucalyptus.Install cloud software and drivers: Make sure Virtio drivers are installed if the image is going to be run in a KVM cluster which has virtio enabled, and verify use if possible (ie. set disks and network interface in hypervisor, try hot plug in for disks, etc). For most recent Linux distributions nothing is needed to be done. Make sure appropriate init scripts are in place; for example: cloud-init packages (if appropriate), and rc.local or similar scripts to prepare new instances at boot time utilizing user/meta-data.
For more information on cloud-init, go to https://help.ubuntu.com/community/CloudInit
For Red Hat Enterprise Linux, and CentOS 7:
yum install cloud-init
Install and configure ssh: For Red Hat and CentOS:
yum install openssh-server systemctl enable sshd.service
Install Euca2ools: For Red Hat and CentOS:
yum install euca2ools
Optionally, update existing packages. For RHEL and CentOS:
Prepare the network: Disable the firewall. It is recommended that the firewall is disabled and network rules are instead enforced in the security-group the instances run in. If the guest’s firewall is not disabled, review the existing rules and make sure they are appropriate for the guest’s future use within a cloud environment. Clear or disable iptable rules: Save the rules in case you want to restore them later:
sudo iptables-save > /root/firewall.rules
Clear the rules:
iptables -F iptables -X iptables -t nat -F iptables -t nat -X iptables -t mangle -F iptables -t mangle -X iptables -P INPUT ACCEPT iptables -P OUTPUT ACCEPT iptables -P FORWARD ACCEPT
For RHEL and CentOS 7, see the Red Hat Migration and Planning Guide Security and Access Control section .
Make sure there is only a single primary network interface. Check the configuration for:
For RHEL and CentOS images, the configuration for the default network interface can usually be found in the following file:
The following is an example of an
ifcfg-eth0 configuration file:
DEVICE=eth0 ONBOOT=yes #THE HWADDR LINE MUST BE COMMENTED OUT OR REMOVED #HWADDR=AA:BB:CC:DD:EE:FF TYPE=Ethernet BOOTPROTO=dhcp PERSISTENT_DHCLIENT=yes
Remove persistent udev rules:
echo "" > /etc/udev/rules.d/70-persistent-net.rules echo "" > /lib/udev/rules.d/75-persistent-net-generator.rules
On CentOS and RHEL, disable zeroconf by adding an entry to the
Clean the image: We recommend that you remove all non-root, non-administrator users before bundling the image. Remove root/Administrator password. We recommend that you remove root’s password for Linux systems.
Once these passwords are removed, access to this system will be limited or blocked until this image is recreated as a cloud instance. SSH host and authorization keys for Linux will be used going forward.
console=ttyS0You’ve now prepared your instance for image creation.