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Maintenance, Failures, and Debugging

• Cloud Controller and Storage Proxy Failures and Maintenance
  • Planned Maintenance
  • Rebooting a Cloud Controller or Storage Proxy
  • Total Cloud Controller Failure
• Compute Node Failures and Maintenance
  • Planned Maintenance
  • After a Compute Node Reboots
  • Instances
  • Inspecting and Recovering Data from Failed Instances
  • Managing floating IP addresses between instances
  • Volumes
  • Total Compute Node Failure
  • /var/lib/nova/instances
• Storage Node Failures and Maintenance
  • Rebooting a Storage Node
  • Shutting Down a Storage Node
  • Replacing a Swift Disk
• Handling a Complete Failure
• Configuration Management
• Working with Hardware
  • Adding a Compute Node
  • Adding an Object Storage Node
  • Replacing Components
• Databases
  • Database Connectivity
  • Performance and Optimizing
• RabbitMQ troubleshooting
  • RabbitMQ service hangs
  • RabbitMQ alerts
  • Excessive database management memory consumption
  • File descriptor limits when scaling a cloud environment
• HDWMY
  • Hourly
  • Daily
  • Weekly
  • Monthly
  • Quarterly
  • Semiannually
• Determining Which Component Is Broken
  • Tailing Logs
  • Running Daemons on the CLI
• What to do when things are running slowly
  • OpenStack Identity service
  • OpenStack Image service
  • OpenStack Block Storage service
  • OpenStack Compute service
  • OpenStack Networking service
  • AMQP broker
  • SQL back end
• Uninstalling

Downtime, whether planned or unscheduled, is a certainty when running a cloud. This chapter aims to provide useful information for dealing proactively, or reactively, with these occurrences.