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SNMP auto LVS balancing

SNMP auto LVS balancing. Jason Liptak. Overview. SNMP overview Network Setup Solution Lessons Learned Future. SNMP – purpose. Monitor Network Servers, Switches, Printers, etc. Change network remotely Community strings to access Public / Private Plain text Version 3 Added security.

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SNMP auto LVS balancing

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  1. SNMP auto LVS balancing Jason Liptak

  2. Jason Liptak Overview • SNMP overview • Network Setup • Solution • Lessons Learned • Future

  3. Jason Liptak SNMP – purpose • Monitor Network • Servers, Switches, Printers, etc. • Change network remotely • Community strings to access • Public/ Private • Plain text • Version 3 • Added security

  4. Jason Liptak SNMP - Implementation • Agents running on devices to respond • Management information base (MIBs) • Describe structure layout of information • Tree layout via numbers specify object identifiers (OID) • Messages • Get(Request/NextRequest/BulkRequest) • SetRequest • Response

  5. Jason Liptak Goal • Using SNMP information • Change load balance of LVS • Preemptive load balancing • Extendable design to other MIBs

  6. Jason Liptak LVS -Access to internet -Access to local -Polls SNMP Server 1 -Access to local -Running SNMP -Running Web Service Server 2 -Access to local -Running SNMP -Running Web Service

  7. Jason Liptak Solution - Scripts • Schedule balance script to run • “at –f script now+1min” • Python script to monitor and modify • Change ipvsadm • Poll SNMP • Parse SNMP • SNMP parsing method • Dictionary tree

  8. Jason Liptak Solution - Calculation • Processor usage determines load • Large requests going to one server • Remotely accessing one server • Processor not running efficiently • Simple calculation • (100 – processor usage) • Sample calculation, easy to change via scripts

  9. Jason Liptak Lessons Learned • Needed better SNMP parsing • More efficient structure and parsing • Ability to aggregate OID sections • SNMP overhead • Specific subsections have unneeded information

  10. Jason Liptak Future • Calculations on more SNMP data • Memory • Interface speed • Processes • See SNMP overhead • Depends on targeted OIDs • Real test • Put in real world work loads and set up

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