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Managine Hadoop Cluster

If you are working on Hadoop, you’ll realize there are several shell commands available to manage your Hadoop cluster.  Hadoop administration commands. 1. Name node Commands Command Description hadoop namenode -format Format HDFS filesystem from Namenode hadoop namenode -upgrade Upgrade the NameNode start-dfs.sh Start HDFS Daemons                        stop-dfs.sh Stop HDFS Daemons start-mapred.sh Start MapReduce Daemons stop-mapred.sh Stop MapReduce Daemons hadoop namenode -recover -force Recover namenode metadata after a cluster failure (may lose data) 2. fsck Commands Command Description hadoop fsck / Filesystem check on HDFS hadoop fsck / -files Display files duri...
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VENOM Vulnerability

How to Patch and Protect Linux Server against the VENOM Vulnerability # CVE-2015-3456 A very serious security problem has been found in the virtual floppy drive QEMU's code used by many computer virtualization platforms including Xen, KVM, VirtualBox, and the native QEMU client. It is called VENOM vulnerability. How can I fix VENOM vulnerability and protect my Linux server against the attack? How do I verify that my server has been fixed against the VENOM vulnerability? This is tagged as high severity security bug and it was announced on 13th May 2015. The VENOM vulnerability has existed since 2004, when the virtual Floppy Disk Controller was first added to the QEMU codebase. Since the VENOM vulnerability exists in the hypervisor’s codebase, the vulnerability is agnostic of the host operating system (Linux, Windows, Mac OS, etc.). What is the VENOM security bug (CVE-2015-3456)? An out-of-bounds memory access flaw was found in the way QEMU's virtual Floppy Disk Controller (F...
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Difference between Soft Mount & Hard Mount

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