Hello @Niranjan Rao, For any Kerberos ticket, the 'ticket_lifetime' (usually 1 day) is the time for which that particular ticket is valid. Once the ticket gets invalid, there is an option (kinit -R) to renew it. User can keep renewing her ticket this way till 'renew_lifetime' time (usually 7 days). The 'renew_lifetime' is calculated from the time the ticket was first acquired. After 'renew_lifetime' is over, a ticket can not be used anymore and a fresh ticket is required to be taken. For example, if you acquire a ticket on 1st Jan 00:00:00, it will expire on 1st Jan 23:59:59. You can keep renewing this ticket till 7th Jan 23:59:59. After that, you'll have no choice but to get a new ticket. Hope this helps ! ... View more

Hello @Ramya Grandhi, The latest HDP 2.5 sandbox image is based on docker. Though it says 8GB RAM recommended but it should work. Be warned that you might experience sluggish, slow operation though. You might not be able to run too many services together. Just to draw parallel, I use HDP 2.5 virtualbox image on a macbook having 16GB RAM and sometime I see 6-8GB of memory consumption by sandbox & occasionally a slight performance hit. Hope this helps. ... View more

Hello @Sami Ahmad, Keeping the jargon aside - Ranger is used for deciding who can access what resources on a Hadoop cluster with the help of policies (there is more to this but this is in the most basic terms). Knox can be imagined as the gatekeeper which decides whether to allow user access to Hadoop cluster or not. More complete definitions: Ranger is an authorization system which allows / denies access to Hadoop cluster resources (HDFS files, Hive tables etc.) based on pre-defined Ranger policies. When user request comes to Ranger, it is assumed to be authenticated already. Knox is a REST API based perimeter security gateway system which 'authenticates' user credentials (mostly against AD/LDAP). Only the successfully authenticated user are allowed access to Hadoop cluster. Knox also provides a layer of abstraction to the underneath Hadoop services i.e. all endpoints are accessed via Knox gateway URL. Follow Apache Ranger project and Apache Knox project for more comprehensive description and full set of feature list. Hope this helps ! ... View more

Hello @Mohammed Seeni Short answer: Use this curl command to submit an Oozie job via curl curl -i -k -u guest:guest-password -H Content-Type:application/xml -T workflow-configuration.xml -X POST 'https://localhost:8443/gateway/sandbox/oozie/v1/jobs?action=start' For the complete Oozie commands via Curl, please follow the Knox guide here. Hope this helps ! ... View more