OpenStack
OpenStack Configuration Reference (http://docs.openstack.org/trunk/config-reference/content/section_compute-hypervisors.html)
OpenStack Install Guide for Debian 7.0 (http://docs.openstack.org/havana/install-guide/install/apt-debian/content/)
OpenStack Install Guide for Red Hat Enterprise Linux, CentOS, and Fedora (http://docs.openstack.org/havana/install-guide/install/yum/content/)
OpenStack Install Guide for openSUSE, SUSE Linux Enterprise Server (http://docs.openstack.org/havana/install-guide/install/zypper/content/)
OpenStack Install Guide for Ubuntu 12.04 (LTS) Server (http://docs.openstack.org/havana/install-guide/install/apt/content/)
OpenStack Cloud Administrator Guide (http://docs.openstack.org/admin-guide-cloud/content/)
OpenStack Security Guide (http://docs.openstack.org/security-guide/content/)
OpenStack Cloud Computing Cookbook (http://www.packtpub.com/openstack-cloud-computing-cookbook-second-edition/book)
Cloud (General)
NIST Cloud Computing Definition (http://csrc.nist.gov/publications/nistpubs/800-145/SP800-145.pdf)
Python
Dive Into Python (http://www.diveintopython.net)
Networking
TCP/IP Illustrated (http://www.pearsonhighered.com/educator/product/TCPIP-Illustrated-Volume-1-The-Protocols/9780321336316.page)
The TCP/IP Guide (http://nostarch.com/tcpip.htm)
A tcpdump Tutorial and Primer (http://danielmiessler.com/study/tcpdump/)
Systems Administration
UNIX and Linux Systems Administration Handbook (http://www.admin.com/)
Virtualization
The Book of Xen (http://nostarch.com/xen.htm)
Configuration Management
Puppet Labs Documentation (http://docs.puppetlabs.com/)
Pro Puppet (http://www.apress.com/9781430230571)