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October 3, 2014
Preventing WordPress XML-RPC DDOS Attack
Content management system,WordPress XML-RPC pingback exploits are used in a number of DDoS attacks in the recent times. WordPress is widely used by many websites that uses a content management system, any vulnerability in the WordPress could compromise the website and break down the Network integrity. Hence it is important to secure and mitigate wordpress websites from…
Read more July 4, 2014
How to Change the Pool Master in Citrix Xenserver
Cloud Infrastructure,In Xenserver pooled environment, if the pool master node goes unresponsive due to some reason. We will not be able to access the slave nodes and its corresponding VM’s from Xencenter. At this time, if we are able to manually SSH into the pool master. We can execute the following commands to make a slave…
Read more June 10, 2014
Steps to Fix VDI Not Available Error in Citrix Xenserver
Cloud Infrastructure,During a Reboot of a VM at some unavoidable circumstances, the Startup logs might end up with “VDI not available” error. Follow the below steps to fix this: Determine the UUID of the Storage Repository and the VDI that’s exhibiting the issue (we can either get this from xencenter or by using xe sr-list name-lable=…
Read more May 30, 2014
How to Fix – When Xenserver Host Stuck in Maintenance Mode
Cloud Infrastructure,In this post you will see how to fix Xenserver Host Stuck in Maintenance Mode. Whenever we restart the xapi service (using either service xapi restart, or xe-toolstack-restart) the API will work for about 30 seconds and then it will stop working and any command we run from that server will show something like this:…
Read more May 19, 2014
Steps to be taken when a VM goes in Read-only mode
VMware,Whenever there is a file system inconsistency involved, the system mounts in Read-only mode to prevent damage to the system. In Xen, if you come across such a situation you can try using the following methods to mount that back in write mode. Boot the VM in single user mode. One can get into single…
Read more October 25, 2013
Active Directory Replication
Network,The Active directory is a database. It designed to handle a large number of read and search operations and a smaller number of changes and updates. Active directory replication is to ensure that the information stored on all domain controllers within a domain synchronized. The domains and domain controllers are multiple communication paths connect them.…
Read more September 20, 2013
Dynamic Routing
Network,Routing Information Protocols (RIP) RIP is using the algorithms known as “distance vector algorithms”. They are sometimes known as Ford-Fulkerson algorithms and the term Bellman-Ford is also used. It send the complete routing table out to all active interface every 30 second.RIP only uses hop count to determine the best way to a remote network.…
Read more September 13, 2013
Basic rules for naming devices in the SAN
Network,The Storage Networking Industry Association (SNIA) defines the storage area network (SAN) as a network whose primary purpose is the transfer of data between computer systems and storage elements. A SAN is a specialized, high-speed network that attaches servers and storage devices. Use of descriptive naming conventions is one of the most important factors in…
Read more September 4, 2013
SCSI event codes for VMware ESX/ESXi
VMware,SCSI (Small Computer System Interface) is an ANSI standard used for attaching peripheral devices to computers. It ensures quick data transfer with a transmission rate of more than 40mbps. SCSI was standardized in 1986 and is still being used. The recent developments of SCSI are Serial Storage Architecture (SSA), SCSI-over-Fibre Channel Protocol (FCP), Serial Attached…
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