OpenNebulaConf 2013 - Monitoring Large-scale Cloud Infrastructures with OpenNebula by Simon Boulet

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Efficient monitoring is crucial when managing your Cloud infrastructure. The metrics collected by OpenNebula can be used to trigger automatic scaling, or quickly detect failures to automatically …

Efficient monitoring is crucial when managing your Cloud infrastructure. The metrics collected by OpenNebula can be used to trigger automatic scaling, or quickly detect failures to automatically restart virtual machines. During this talk, I will show how OpenNebula can be used to efficiently monitor thousands of virtual machines at sub-1 minute interval. I will show how OpenNebula can be enhanced and optimized, and how different metrics collection tools such as Ganglia and Host-sFlow can be used with OpenNebula to monitor large-scale Cloud infrastructures.

Bio:
Simon Boulet is an Entrepreneur and an IT Consultant from Montreal, Canada. He has worked on various Cloud infrastructure projects, including projects for the CBC/Radio-Canada public television that had important scaling needs for hosting online interactive TV shows. Prior to becoming an IT Consultant, Simon was IT Director at iWeb, Canada’s largest Web Hosting company, where he led iWeb’s first steps into Cloud Computing with the development of the Smart Servers. Simon is also an active and frequent contributor to OpenNebula, with a deep understanding of OpenNebula internals, and has contributed several enhancements and bug fixes that made it through the official releases of OpenNebula.

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  • 1. Monitoring Large-scale Cloud Infrastructures with OpenNebula Simon Boulet OpenNebula Consultant Co-founder of the Cloudnorth.com Project simon@nostalgeek.com
  • 2. Goals 1. Show how to configure OpenNebula to achieve sub-1 minute monitoring interval 2. Demonstrate the use of OpenNebula in large-scale cloud infrastructures 3. Suggest enhancements to OpenNebula performance and monitoring
  • 3. How Big Exactly is Large-scale? How many hosts? 1,000? 2,000? 10,000 VMs?
  • 4. Monitoring in OpenNebula ● Detects when a VM or host changes status (Running, Stopped, etc.) ● Built-in metrics: CPU, memory and network usage ● You can add as many metrics as you like by customizing driver ● Can be used to perform various tasks (auto scaling, high-availability redeployment, etc.)
  • 5. Don't Expect the Default Configuration to Perform Optimally ● Database: Use MySQL database backend, not the default SQLite ● Logs: Use Syslog log system, and disable debug logging (debug_level=1) ● Number of threads: Adjust the number of drivers threads (see -t option to your *MAD config options)
  • 6. Use OpenNebula >= 4.0 Prior versions did monitoring in two phases: 1. The IM Monitor action monitored Hosts 2. The VMM Poll action monitored VMs 100 Hosts + 1,000 VMs * 15 seconds interval = 4,400 actions per minute Since OpenNebula 4.0, the IM Monitor action is capable of returning the information of VMs running on the monitored host
  • 7. Monitoring History By default OpenNebula keeps 24h of monitoring history 15 seconds interval X 24h = 5760 records per VM Average record size: 4KB 23MB of monitoring history per VM 100 VM = 2.3GB 10,000 VM = 230GB HOST_MONITORING_EXPIRATION_TIME and VM_MONITORING_EXPIRATION_TIME config options
  • 8. Monitoring History (continued) ● Reduce history to 30 minutes (1800 seconds) ● Use MySQL MEMORY storage engine for vm_monitoring and host_monitoring tables It's OK to lose monitoring history when MySQL is restarted Most recent monitoring values are stored in VM template Set MySQL max_heap_table_size large enough to hold all your monitoring history
  • 9. Watch your Load Average As of 4.2, the maximum number of simultaneous XML-RPC API connections is limited to 15 Overloaded OpenNebula = Slow XML-RPC API response = API Limit / Timeout ● Reduce load at deployment time by adjusting number of VMs simultaneously deployed by scheduler ● Watch next release (4.4) for XML-RPC API concurrency enhancements
  • 10. Local Caching Nameserver OpenNebula use DNS name for monitoring hosts (unless you named your hosts using their IP address instead of name) ● Use a local caching nameserver to speed up DNS lookup (such as dnsmasq).
  • 11. Beware of SSH Transport Most OpenNebula drivers (KVM, Xen, etc.) use SSH connections to perform actions OK for deploying new VM, but expensive when doing VM monitoring
  • 12. Meet Ganglia << Ganglia is a scalable distributed system monitor tool for high-performance computing systems such as clusters and grids. >> - Wikipedia OpenNebula has built-in support for Ganglia By default Ganglia and OpenNebula must run on the same machine Set GANGLIA_HOST in /var/lib/one/remotes/im/ganglia.d/ganglia_probe and /var/lib/one/remotes/vmm/kvm/poll_ganglia
  • 13. Meet Ganglia (continued)
  • 14. Ganglia Driver Limitations 1. Currently only 1 Ganglia Collector is supported 2. Need to run script on each host to export OpenNebula-specific metric (OPENNEBULA_VMS_INFORMATION) 3. Ganglia as a maximum length of 1392 bytes for string metrics
  • 15. Host sFlow << The Host sFlow agent exports physical and virtual server performance metrics using the sFlow protocol. The agent provides scalable, multi-vendor, multi-OS performance monitoring with minimal impact on the systems being monitored.>> - http://host-sflow.sourceforge.net/ Exports a standard set of hypervisor and VM metrics Official support for Xen, KVM and Hyper-V, but uses Libvirt to gather metrics (and Libvirt has support LXC, OpenVZ, VMWare, etc.)
  • 16. Host sFlow (continued) Source: http://blog.sflow.com/2012/02/ganglia-33-released.html
  • 17. Host sFlow (continued) Sample Metrics Hosts Metrics VMs Metrics Not currently supported in OpenNebula. Contact me if you're interested. vnode_mem_total Hypervisor Total Memory vnode_domains Hypervisor VM Count <VM ID>.vcpu_state VM State (Running, Stopped, etc.) <VM ID>.vmem_util VM Memory Utilization <VM ID>.vdisk_free VM Free Disk Space
  • 18. 4,000 VMs at Sub-1 Minute Interval OpenNebula 4.2 + xml-rpc patch (upcoming in 4.4) Experimental Host sFlow Driver 1 OpenNebula Core (EC2 High-CPU XLarge instance) 1 Sunstone Web Server (EC2 Standard Medium instance) 1 Ganglia Collector (EC2 Standard Medium instance) 100 Hosts (EC2 High-CPU Medium instances) ~40 VMs per Host ~4,000 VMs (OpenVZ) 15 - 60 second monitoring interval
  • 19. 4,000 VMs at Sub-1 Minute Interval
  • 20. 4,000 VMs at Sub-1 Minute Interval
  • 21. 4,000 VMs at Sub-1 Minute Interval
  • 22. Looking Forward There’s room for optimizations ● The command line tools can get very slow when returning very large result sets (but not the API…) ● Distributed driver, for example using ZeroMQ for distributing tasks to multiple workers ● Investigate PoolSQL locks being held for long period and blocking other threads (discussed in bug #1818) ● Gather metrics about OpenNebula internals: locks wait, effective monitoring interval, memory footprints, etc. ● Investigate very large Sunstone memory usage
  • 23. Thank you! Questions? “OpenNebula captured my interest for several technical reasons besides the fact that it is truly open. It's architecture is very elegant; it has C++ bones, ruby muscles and bash tendons. It's extensible and understandable. It has no peer as far as I can tell.” Christopher Barry, Infrastructure Engineer, RJMetrics, September 2012 http://opennebula.org/users:testimonials