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 will go ahead and install ambari-agent in all the nodes you mention during installation and configure the services. 1. Login to the ambari-server and launching install … [Read more...] about HDPCA Exam Objective – Install HDP using the Ambari 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 HDP cluster. 1. Simlar to ambari-agent installation, first we will have to download the ambari repository file. # wget -nv … [Read more...] about HDPCA Exam Objective – Install ambari agent
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 of the project contributors. To manage an HDP cluster you need to set up an ambari-server(ideally on a separate machine) … [Read more...] about HDPCA Exam Objective – Install ambari-server
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 AWS is m3.2xlarge which has 30 GB of memory and 8 vCPUs. You can opt for the spot instances if you are on a budget. The Hadoop Admin Certification HDPCA (HDP Certified Administrator) exam … [Read more...] about Preparing for the HDPCA (HDP Certified Administrator) Exam
Solaris : How to start syslogd in debug mode
The post outlines the steps to run the syslog daemon in debug mode. 1. Stop the syslogd daemon: # /etc/init.d/syslog stop ### Prior to Solaris 10 # svcadm disable svc:/system/system-log:default ### Solaris 10 and above 2. The environment variable SYSLOGD_DEBUG affects the amount of output from syslog in debug mode. The default value is 1, which provides the least amount of output. Setting this variable to 5 provides the most output. For … [Read more...] about Solaris : How to start syslogd in debug mode
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 for Ambari and HDP Stack 1. Create a directory to store the ambari and HDP stack repository in the web server directory used to store the … [Read more...] about HDPCA Exam Objective – Configure a local HDP repository
How to configure rsyslog on Solaris 11.1 to send messages to a remote host using TCP
The system/rsyslog service is newly available in the Solaris 11.1 release. To send and receive messages over TCP, the rsyslog pkg must be installed on the sending Solaris system (the source system) and the receiving Solaris system (the remote loghost). The rsyslog package is not installed by default in Solaris 11.1 and later, and may need to be added. On both the source Solaris system and remote loghost system, check for the rsyslog package with: # pkg info system/rsyslog pkg: info: no … [Read more...] about How to configure rsyslog on Solaris 11.1 to send messages to a remote host using TCP
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 can also provide authentication services via an associated PAM module. The pam_winbind module supports the auth, account and password module-types. The winbind service is provided … [Read more...] about Linux OS Service ‘winbind’
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 protocols using rpc (in particular, nfs). Before exchanging any rpc requests using rpcsec_gss, the rpc client must first establish a … [Read more...] about Linux OS Service ‘rpcgssd’
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 page of resolve.conf: The "options timeout:n" option sets the amount of time the resolver will wait for a response from a remote name server before retrying the query via a … [Read more...] about How to Change Time Interval to Fall Back to Secondary DNS Server in CentOS/RHEL