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Backup and Restore Logical Volume using LVM Snapshot

Backup Restore LVM using Snapshot
LVM (Logical Volume Manager) gives us the ability to create Snapshots. LVM Snapshot is a logical volume that temporarily preserves the original data of changing logical volume, so it’s data can be backed up preserving consistency. Snapshot must be created prior to any critical modifications on the Logical Volume in order to fulfill it’s role.

Note: Snapshot Volume needs to be large enough to store the data that will change while it exists. If more data changes than the Snapshot can hold, the Snapshot will become unusable. That means we have to “predict” how much data will be changed on the original Volume while the Snapshot exists to let the Snapshot hold all those data changes.
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OpenStack Kilo 3 Node Installation (Controller, Network, Compute) on CentOS 7

install openstack on three nodes
In this tutorial we will install OpenStack Kilo release from RDO repository on three nodes (Controller, Network, Compute) based on CentOS 7 operating system using packstack automated script. The following installation utilizes VLAN based internal software network infrastructure for communication between instances.

Environment used:
public network (Floating IP network):
internal network (on each node): no IP space, physical connection only (eth1)
controller node public IP: (eth0)
network node public IP: (eth0)
compute node public IP: (eth0)
OS version (each node): CentOS Linux release 7.2.1511 (Core)
install openstack on 3 nodes
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Register Red Hat 7 using Subscription Manager via Proxy

Register Red Hat 7 using Subscription Manager via Proxy
Once our Red Hat 7 system is installed, it should be registered at RHN using Subscription Manager in order to be able to get newest updates. If the server is placed in network behind firewall and outgoing traffic is blocked by firewall, the only reliable way of keeping our Red Hat 7 up-to-date is through proxy (if any exists).
Below we will show you in 2 simple steps, how to configure HTTP Proxy for Red Hat Subscription Manager and register Red Hat 7 with RHN in command line using HTTP Proxy:
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