Note: This is post is part of the HDPCA exam objective series We have seen in the last posts, how to install ambari-server and ambari-agent. Let us now see how we can install the HDP cluster using the ambari install wizard. We will be having the cluster topology as shown below. The ambari-server install wizard […]
Archives for June 2018
HDPCA Exam Objective – Install ambari agent
Note: This is post is part of the HDPCA exam objective series The ambari agent communicates with the ambari server and provides all the necessary information required to the ambari-server. This post outlines the steps to install and configure the ambari agent. The ambari agents need to be installed in all the nodes in the […]
HDPCA Exam Objective – Install ambari-server
Note: This is post is part of the HDPCA exam objective series What is ambari-server and ambari-agent Ambari is an Apache project (http://ambari.apache.org), which in theory, provides an open source alternative to Cloudera Manager. It is the administration console for the Hortonworks distribution. At the time of writing Hortonworks employees are also the vast majority […]
Preparing for the HDPCA (HDP Certified Administrator) Exam
Taking the Practice HDPCA practice exam on AWS Before taking the HDPCA exam, you can get the feel of the exam by using the HDPCA practice exam on AWS cloud. The practice exam is very similar to the actual exam. You can perform 6 tasks for practice on this machine. The recommended instance configuration in […]
HDPCA Exam Objective – Configure a local HDP repository
Note: This is post is part of the HDPCA exam objective series To be able to install HDP in enterprise environments we have to configure the local repositories. There are 2 repositories that are required to get an enterprise Hadoop cluster up and running, namely: 1. Ambari Repositories 2. HDP Stack Repositories Configuring local repositories […]
Linux OS Service ‘winbind’
Winbind unifies UNIX and Windows NT account management by allowing a UNIX box to become a full member of a NT domain. The service provided by winbind daemon, is called winbind and can be used to resolve user and group information from a Windows NT server, which makes it understandable by UNIX platforms. The service […]
Linux OS Service ‘rpcgssd’
This service manages RPCSEC GSS contexts for the NFSv4 client, which provides support on the client side for RPCSEC_GSS protocol. It will start rpc.gssd daemon to communicate with server-side rpcsec_gss daemon rpc.svcgssd. If using NFSv4, it is needed. The rpcsec_gss protocol gives a means of using the gss-api generic security api to provide security for […]
How to Change Time Interval to Fall Back to Secondary DNS Server in CentOS/RHEL
The Ask How to change the time to wait before failing over to Secondary DNS server in case Primary doesn’t respond? The Solution The parameter timeout:n can be set in the configuration file /etc/resolv.conf to adjust the time taken to fallback to a secondary DNS in case the primary is not reachable. From the Man […]
How to use auditd to monitor a specific SYSCALL
A SYSCALL happens whenever a user executes a command that requests that the Linux kernel provide a service. There are several SYSCALL like mount, umount, kill, open etc. These SYSCALLs can be monitored with the auditd system. Let’s take “kill” SYSCALL as an example. The user wants to capture who has killed a certain process […]
Slow SSH login due to unreachable rsyslog server
The problem We faced this weired issue last week, where the SSH to the servers was too slow. SSH to the Linux servers was taking long time around 30 seconds to 1 minute. SSH got stuck at the below prompt and no option to enter password for 30 seconds and password prompt was displayed but […]