How To Setup A Replicated GlusterFS Cluster On AWS EC2- Google Cloud Platform -Azure

GlusterFS  is one of the best open source distributed file systems. If you want a highly available distributed file system for your applications, GlusterFs is one of the good options. Now: AWS offers a managed scalable file storage called Elastic File System. If you don’t want the administrative overhead of glusterFS clusters, you can give EFS a try…

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Hadoop Ecosystem and its components

Big Data is the buzz word circulating in IT industry from 2008. The amount of data being generated by social networks, manufacturing, retail, stocks, telecom, insurance, banking, and health care industries is way beyond our imaginations. Before the advent of Hadoop, storage and processing of big data was a big challenge. But now that Hadoop…

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Potential Impact on Processors in the POWER family

On Wednesday, January 3, researchers from Google announced a security vulnerability impacting all microprocessors, including processors in the IBM POWER family. This vulnerability doesn’t allow an external unauthorized party to gain access to a machine, but it could allow a party that has access to the system to access unauthorized data. If this vulnerability poses…

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Installing Kubernetes Dashboard on Kubernetes Cluster

Objectives Install k8s dashboard on Kubernetes cluster Prerequisites Master: k8s-1.on.ec Ubuntu 16.04 192.168.100.52 Worker: k8s-2.on.ec Ubuntu 16.04 192.168.100.53 Worker: k8s-3.on.ec Ubuntu 16.04 192.168.100.54 Install Kubernetes 10 Minutes Instructions Install the latest stable release 1 kubectl create -f https://git.io/kube-dashboard Proxy 1 kubectl proxy –address=‘0.0.0.0’ –port=8001 –accept-hosts=‘^*$’…

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How to truncate /var/adm/wtmp in AIX

/var/adm/wtmp contains login and logoff information in reverse chronological order. The last command can be used to view the contents of wtmp. An example of the output of last is shown below. $ last oracle pts/2 200.254.1.207 Jun 29 15:36 – 15:44 (00:08) oracle pts/2 192.253.1.20 Jun 29 15:34 – 15:35 (00:01) oracle pts/2 192.252.1.20 Jun 29 15:32 -…

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How to disable telnet on a Brocade fibre channel switch?

ipfilter –clone BlockPort23 -from default_ipv4 ipfilter –show   ipfilter –delrule BlockPort23 -rule 2 ipfilter –addrule BlockPort23 -rule 2 -sip any -dp 23 -proto tcp -act deny ipfilter –save BlockPort23 ipfilter –activate BlockPort23   ipfilter –show Name: default_ipv4, Type: ipv4, State: defined Rule Source IP Protocol Dest Port Action 1 any tcp 22 permit 2 any…

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Apache cookbook fail to start Chef

I write a cookbook on Chef.But I got an error.   package ‘apache2’ service ‘apache2’ do action [:enable, :start] end file ‘/var/www/html/index.html’ do content ‘<html> <body> <h1>Hello World</h1> </body> </html>’ end   Error: STDERR: AH00558: apache2: Could not reliably determine the server’s fully qualified domain name, using 127.0.0.1. Set the ‘ServerName’ directive globally to suppress…

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HACMP- (PowerHA) Volume group-Logical Volume-Filesystems-(Mount-Point) Rename Operations

Hi, These days, I need a rename operations  volume group,logical volume and filesystems mount point on HACMP(PowerHA) cluster. Firstly rename logical volume name,You should do below steps smit hacmp-system management- storage-logical volumes- Set Characteristics of a Logical Volume-Rename a Logical Volume Volume Group Name emrevg Resource Group Name emrep_RG Node List emrep_cls1,emrep_cls2 * CURRENT logical…

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