Technology and Technology

ElasticSearch Installation: The version we want to install is 2.x (latest sub version of 2). First we have to install java on centOS machine with following command: sudo yum install java-1.8.0-openjdk.x86_64 Install Public Signing Key:   rpm --import https://packages.elastic.co/GPG-KEY-elasticsearch Create new repo in your /etc/yum.repos.d/ directory. For example I have created elasticsearch.repo here. /etc/yum.repos.d/elasticsearch.repo -------------------------------------------------------------------------------------------- [elasticsearch-2.x] name=Elasticsearch repository for 2.x packages baseurl=http://packages.elastic.co/elasticsearch/2.x/centos gpgcheck=1 gpgkey=http://packages.elastic.co/GPG-KEY-elasticsearch enabled=1 --------------------------------------------------------------------------------------------- Now Elasticsearch 2.x will avilable for installation using yum   yum install elasticsearch After installation enable the service a...

Network Scenario: LB1: 192.168.10.10 LB2: 192.168.10.11 Virtual IP: 192.168.10.12 APP_Server1: 192.168.10.20 APP_Server2: 192.168.10.21 Load Balancing: STEP 1 - Install HAProxy: HAProxy package is available under default yum repository for CentOS, Redhat systems. Use the following yum package manager command to install HAProxy on your system.   # yum install haproxy   STEP 2 - Configure HAProxy : Update your HAProxy configuration file /etc/haproxy/haproxy.cfg as per your requirement, You may also use below given configuration file as an example of setup and modify it. Keep the config file same of both servers i.e. LB1 and LB2.   ----------------------------------------------------------------------------------------------------------- global         log /dev/log    local0         log /dev/log    local1 notice     ...

HAProxy automatic failover HAProxy is a TCP load balancing tool with some useful features, including ACLs and SSL termination support. I’ve been using it for a while now on a number of load-balanced sites where scalability is key. What I haven’t yet looked at, however, is automated failover capabilities. My aims were simple: If a server fails, stop using it. If said server starts working again (i.e. because the problem is fixed) start using it again. If all servers in the load balancer pool fail, serve a temporary static page from another location. But first: Some basic HAProxy concepts HAProxy as a load balancer is fairly simple, and works on the basis of defined frontends and backends. A frontend is simply an IP and port declaration that you want the load balancer to listen on. A backend is the set of servers that requests to a frontend are sent to. Your HAProxy configuration lists the frontends and their respective backends, as well as the load balancing algorithm ...

Samsung has a projector phone or two in its portofolio, but what about tablets with projectors? That hasn’t been done by any company as far as I know, so the market is open. Laura Hong and Charles de Belizal envisioned a projector tablet and called it the Samsung Galaxy One, that you can see below. This device measures 14mm in thickness, packs a projector, Windows 8, an aluminum body and brushed aluminum feet. The Galaxy One has two “feet”, that help prop it up in media viewing position if you want to watch movies and also prepare it to project data during a business meeting, for example. It has a great projection angle and the projector is incorporated right above the camera sensor, that also includes a flash. A stylus is also in the mix and the Metro UI seems to fit right in with this Samsung tablet concept. The virtual QWERTY keyboard also looks comfortable and I guess it’s part of the design, since it doesn’t resemble the standard input method in Windows 8....

They say that lightning never strikes twice, but this amazing photo proves otherwise. An incredible eight bolts struck the Bay Bridge in San Francisco last night which was captured in this incredible shot by photographer Phil McGrew, who took the photo through the rain-soaked window of his apartment.  Mr McGrew, 49, was shocked at the striking image which shows the split-second moment of electric forks hitting the span of the bridge. Lucky strike! Eight bolts of lightning hit the iconic Bay Bridge in San Francisco in a spectacular once in a lifetime moment captured by photographer Phil McGrew  The currency trader, who took up photography as a hobby two years ago, put his camera near his window as the rare thunderstorm lashed the city at 6pm. He said: 'I moved from Fort Lauderdale, Florida to San Francisco about two years ago. 'We used to get a lot of big storms in Florida, but I've only seen them a couple of times here.