On Linux there is an audit RPM named audit, which provides auditd service to monitor the processes and the commands as well. Using audit RPM we can audit some simple file operation like read, write and execution. This post will introduce a method to monitor the file access on the Linux system. Like “When the […]
Archives for August 2018
How to disable the default apache “Welcome Page” in CentOS/RHEL 7
The Problem When you install Apache 2, you would see the “Welcome Page” as shown below when you first open the URL IP of the server. You may not find this page in the default Document Root “/var/www/html” as well. How can we disable this page and have our own page being displayed? The Solution […]
CCA 131 – Rebalance the cluster
Note: This post is part of the CCA Administrator Exam (CCA131) objectives series In a long-running cluster, there might be an unequal distribution of data across Datanodes. This could be due to failures of nodes or the addition of nodes to the cluster. To make sure that the data is equally distributed across Datanodes, it […]
CCA 131 – Commission/decommission a node
Note: This post is part of the CCA Administrator Exam (CCA131) objectives series Cloudera Manager makes it very simple to add and remove hosts in a cluster. All host management operations in Cloudera Manager are done from the Hosts screen. In this post, we will go through the steps of Commissioning and decommissioning a host […]
CCA 131 – Add a service using Cloudera Manager
Note: This post is part of the CCA Administrator Exam (CCA131) objectives series To start with we have just installed few services like HDFS, YARN, and zookeeper in our CDH setup. The Cloudera Manager enables you to add any other service later on. As a part of the exam, you may be asked to add […]
CCA 131 – Add a new node to an existing cluster
Note: This post is part of the CCA Administrator Exam (CCA131) objectives series Cloudera Manager makes it very simple to add and remove hosts in a cluster. All host management operations in Cloudera Manager are done from the Hosts screen. In this section, we will go through the steps of adding a new host to […]
CCA 131 – Install CDH using Cloudera Manager
Note: This post is part of the CCA Administrator Exam (CCA131) objectives series In the last post, we have seen how to install the Cloudera server manager and Cloudera Manager agents. In this post, we will begin installing the CDH cluster using the Cloudera Manager. You can point your browser to http://[cloudera manager host]:7180 and […]
CCA 131 – Install Cloudera Manager server and agents
Note: This post is part of the CCA Administrator Exam (CCA131) objectives series Cloudera Installation Paths There are 3 paths in which the cloudera cluster can be installed and configured. PATH A – Automated Installation PATH B – Using Cloudera Manager with local Parcel/Packages PATH C – Manual Installation using tarballs Cloudera installation Phases Whichever […]
CCA 131 – Perform OS-level configuration for Hadoop installation
Note: This post is part of the CCA Administrator Exam (CCA131) objectives series In the last post we have setup the local CDH repository. But before we can perform any installation or even before setting up the repositoy you must perform few OS-level configurations. The OS-level configuration includes: Enabling NTP Configuring Network Names (hostnames/FQDNs) Disabling […]
Preparing for the CCA Administrator Exam (CCA131)
CCA 131 or Cloudera Administration Certification Exam is the most valued certification exam in the Hadoop world. The exam is practical oriented with sample scenarios to work upon. Number of Questions: 8–12 performance-based (hands-on) tasks on pre-configured Cloudera Enterprise cluster. Time Limit: 120 minutes Passing Score: 70% Language: English Price: USD $295 Exam Objectives Install […]