Usually after initial install of arcadia, a default admin account is created on the system to allow registration and initial login & setup through the Arcadia UI console / browser.
In case that doesn’t happen, here are a few things you can try:
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If using CDH parcel installation through Cloudera Manager you can try re-initializing: as shown here:
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Alternatively, you can use command line utility. Make sure the visualization server has been started. Then SSH to the host running the visualization server and run the below commands:
> sudo su arcadia > /opt/cloudera/parcels/ARCADIAENTERPRISE/lib/arcviz/arcviz createsuperuser