vCloud Director : vSphere enter to maintenance mode

• System-> Manage & Monitor
• vSphere Resources -> Hosts

1. Find the host you need to place in to maintenance mode, right click and select Disable Host.
2.  At that point, the status will turn from a green circle with a check, to a red circle.
3. Right click on the host again and select Redeploy All VMs.
4. The ESXi host will go in to maintenance mode in the vCenter server and evacuate all virtual machines as usual.
5. (Optional!) If you see vsla errors (such as the screenshot), issues with deleting vApps, Unprepare the host which removes the vCloud agent from ESXi
6. (Optional!) Prepare the host for vCloud by pushing the vCloud agent to ESXi
7. When maintenance is complete, right click and Enable Host.
8. And your work is complete!

Oracle Linux Vs RHEL

As one of the most widely deployed operating systems today, Linux is increasingly being adopted for cloud-based solutions. Oracle Linux is the most complete and integrated solution available—and delivers higher performance and better reliability at up to 7 times lower cost than Red Hat. Below, explore the top ten reasons why Oracle Linux provides more value than Red Hat Enterprise Linux.

Reason	Oracle Linux	Red Hat Enterprise Linux
Lower Cost	Oracle Linux is free to download and distribute Support subscription for Oracle Linux is simple and extremely affordable Support costs can be up to 7 times lower than Red Hat	Red Hat Enterprise Linux cannot be downloaded unless you buy a support subscription Very high-cost subscriptions and add-ons Complex licensing
Management Tools Included	Oracle Linux Support customers get access to free Oracle Linux server lifecycle management tools that are the equivalent of Red Hat Satellite Server and associated modules The same Oracle Enterprise Manager tool can also be licensed to manage the entire solution from application to disk.	Users have to license Red Hat Satellite Server and associated modules for each server; the extra cost can quickly add up
High Availability (HA) Included	Oracle Linux includes OCFS2 and Oracle Linux Basic and Premier Support subscribers have free access to Oracle Clusterware	Red Hat charges separately for add-ons that include clustering software for HA
XFS Support included	Oracle Linux Premier Support subscribers have free support for XFS	Red Hat charges separately for the XFS add-ons
Free Download of Binaries and Source	Oracle Linux installation media (DVD) are free to download, use and distribute All source code for Oracle Linux, including source code for patches and errata are freely, publicly available	Red Hat Enterprise Linux cannot be downloaded unless you buy a support subscription
Enterprise-Quality Support with Premier Backporting	Same level of 24/7 enterprise-class support as Oracle Database Backport bug fixes are available between update releases without forcing customers to upgrade to the entire update release Zero downtime updates with Ksplice	Various levels of support include business hours only Red Hat forces customers to upgrade to the latest update release in order to apply only a few bug fixes Need to re-boot for software updates and patches
Higher Performance	Oracle's Unbreakable Enterprise Kernel closely tracks the mainline kernel and offers customers access to the latest Linux innovations The Unbreakable Enterprise Kernel is fast, modern, and reliable New record-breaking TPC-C and SPECjEnterprise2010 benchmark results	Red Hat Enterprise Linux 5 (RHEL5) is using a four-year-old kernel, so customers using RHEL5 did not benefit from Linux innovations
Ease of Deployment	To enable faster time to market for customers, Oracle provides documented best practices with Oracle Validated Configurations for Linux, which include recommendations on deploying pretested stacks of server, storage, drivers, networking components, Oracle Linux, and Oracle software in a physical and virtual environment Oracle VM Templates offer pre-installed and pre-configured images of enterprise software running on Linux, eliminating the need to install and configure from scratch	Red Hat does not offer such a program Red Hat does not adequately test with Oracle software
Integrated with Systems	Oracle's Sun x86 servers come preinstalled with Oracle VM and Oracle Linux; support for Oracle Linux is already included with the Oracle Premier Support for Systems	Red Hat needs to partner with other hardware and software companies to offer full stack
Fully Tested and Ready for Data Center Deployments	Oracle makes significant investment in testing Linux internally, both in the development farm and Global IT More than 80,000 hours of QA is run on Oracle Linux servers each day in our development farm More than 42,000 servers run Oracle Linux supporting Oracle's Global IT	Red Hat does not test with Oracle Database and Oracle Applications
Complete Solution with a Single Point of Contact for Support	Only Oracle offers a complete and integrated, applications-to-disk Linux solution (servers, operating system, database, and applications), including a single point of support—eliminating finger pointing among various vendors	Need to deal with numerous vendors for the solution and for support

LMD : Linux Malware Detect

Linux Malware Detect (LMD) is a malware scanner for Linux released under the GNU GPLv2 license, that is designed around the threats faced in shared hosted environments. It uses threat data from network edge intrusion detection systems to extract malware that is actively being used in attacks and generates signatures for detection. In addition, threat data is also derived from user submissions with the LMD checkout feature and from malware community resources. The signatures that LMD uses are MD5 file hashes and HEX pattern matches, they are also easily exported to any number of detection tools such as ClamAV.

Linux Malware Detect (LMD) Features:
 * MD5 file hash detection for quick threat identification
 * HEX based pattern matching for identifying threat variants
 * statistical analysis component for detection of obfuscated threats (e.g: base64)
 * integrated detection of ClamAV to use as scanner engine for improved performance