Step 1: Install git rpm # yum install git Check it version: # git –version Step 2:  Set basic  Setting Set user and email by per account basis, just why i used “—global” as keyword # git config   –global    user.name   vimal # git config   –global    user.email   vdaga@lwindia.com Above command create “~/.gitconfig”  file in your home directory and maintain above record as : [user] Name = vimal Email = vdaga@lwindia.com You [...]

Read more

A decompiler is a computer program that performs the reverse operation to that of a compiler. That is, it translates program code that usually designed to be computer readable rather than human readable into a form usually designed to be human readable. How to Convert Java class into Java Source Code using “jad” command: Step 1: Get decompiler Get the “jab” software from link, according to ur OS : http://varaneckas.com/jad/ [...]

Read more

Whenever I think about developing my career in IT, I always have a desire to enhance my knowledge pattern and skill set with information and skills that are related to my field of work. There are a number of skills and tools that can come handy when I start working as a professional, but only the training with the best of skills will help me excel as a professional and [...]

Read more

SYSTEMD Package Manage System Services in RHEL7 check package # rpm -q systemd instead of “init” process, now from rhel7 “systemd” manage it, check by #pstree cmd it makes system boot time fastest by parallel startup of system services and also think for dependency based service control logic. it reduce load on processor and ram by activating on-demand activation of daemons takes snapshot of system state at particular moment systemctl [...]

Read more

Hive is developed by Facebook Its mainly developed to make DBA life easy with Hadoop SQL for hadoop Data ware house on top of HDFS that adds structure It has HiveQL language to manage Data Its like SQL syntax For eg: ———————————————————————————————————————————– CREATE TABLE  student ( student_id  INT, name   STRING, course STRING remarks STRING ) ROW FORMAT DEMILITED FIELDS TERMINATED BY “\t” LINES TERMINATED BY “\n” LOAD DATA INPATH ‘/mydata/student.txt’ [...]

Read more

How to Setup Single Node (Pseudo Distributed Node) Hadoop Cluster Step 1: Get hadoop rpm from apache site, search on google “apache hadoop download” http://www.apache.org/dyn/closer.cgi/hadoop/common/ in LinuxWorld Lab, run # yum install hadoop step 2: Get java rpm from oracle site , search on google “jdk download” http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html in LinuxWorld Lab, run # yum install jdk step 3: [root@server Desktop]# rpm –ql   jdk | grep java$ /etc/.java /usr/java /usr/java/jdk1.7.0_51/bin/java /usr/java/jdk1.7.0_51/jre/bin/java [...]

Read more

Hadoop Technology Stack   Hadoop Core / Common Project Distributed Storage : HDFS Distributed Processing : MapReduce (MR1) Distributed Scheduling : YARN (MR2) (its started in Hadoop v2) How data can be accessed and processed  from Hadoop FrameWork without writing Map Reduce Job PIG : http://pig.apache.org/ Hive : http://hive.apache.org/ How to Process Data Storage or DB in Hadoop HBase : http://hbase.apache.org/ Cassandra : http://cassandra.apache.org/ Storage Management Services HCatalog : http://incubator.apache.org/projects/hcatalog.html RegEx and [...]

Read more

There is four packet transfer b/w client and dhcp server during initial negotiation 1st : client send DHCP Discover to dhcp server 2nd: server send DHCP Offer to client 3rd: client send DHCP Request to server 4th: finally server send DHCP Ack to client its means server send only 2 packet, 2nd and 4th, so in our n/w environment, we know on which port our DHCP server connected, make that [...]

Read more

In this attack malicious attacker send enough requests flooded onto the network for DHCP discover, the attacker can completely exhaust the address space allocated by the DHCP servers for an indefinite period of time. Actual Clients of the victim network are then starved of the DHCP resource(s), thus DHCP Starvation can be classified as a Denial of Service attack. The network attacker can then set up a Rouge DHCP Server [...]

Read more

Configure DHCP server on cisco router R1#conf t R1(config)#service dhcp R1(config)#ip dhcp pool MY-POOL R1(dhcp-config)#network 172.24.0.0 255.255.255.0 R1(dhcp-config)#default-router 172.24.0.254 R1(dhcp-config)#dns-server 8.8.8.8 R1(dhcp-config)#domain-name lw.com R1(dhcp-config)#lease 1 10 15 R1(config)#ip dhcp excluded-address 172.24.0.1 172.24.0.10 Test DHCP server by show commands R1#show ip dhcp binding R1#show ip dhcp server statistics R1#show ip dhcp pool Debug dhcp server R1#debug ip dhcp server packet R1#debug ip dhcp server events  

Read more