[UIMA-6124] Simplify master/backup determination for reliable DUCC

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: future-DUCC
• Component/s: DUCC
• Assignee: Burn L. Lewis
• Reporter: Burn L. Lewis
• Created: 05/Sep/19 22:48
• Updated: 20/Dec/19 20:14
• Resolved: 20/Dec/19 20:14

Description

Replace the multiple DuccHead classes by one that checks if a reliable installation & if a head node is active.  Simplify scripts by not checking if the Keepalived configuration is consistent with the head node declarations.  Allow a single-node DB to be auto-managed by the master head node.  Get the (first part of) the current node name via python from ducc_base's self.localhost rather than running /bin/hostname.