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Quattor in Amazon Cloud

Quattor in Amazon Cloud. C. Loomis (CNRS/LAL) Quattor Workshop (London) 11-13 March 2009. Contents. Amazon Web Services (AWS) Summary of AWS services Differences with standard virtual machines Quattor in Cloud What services/tools are needed?

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Quattor in Amazon Cloud

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  1. Quattor in Amazon Cloud C. Loomis (CNRS/LAL) Quattor Workshop (London) 11-13 March 2009

  2. Contents Amazon Web Services (AWS) • Summary of AWS services • Differences with standard virtual machines Quattor in Cloud • What services/tools are needed? • How does a machine get instantiated and installed? Quattor Modifications Quattor in Amazon Cloud — C. Loomis — 11-13 Mar. 2009

  3. Amazon Web Services Elastic Compute Cloud (EC2) • Provides easy interface for allocating and starting machines. • Five different machine configurations available. • Supports various Linux, OpenSolaris, Windows server. Elastic Block Store (EBS) • Acts as a mountable, persistent disk. • Can associate disk with image dynamically at startup. • Uses Simple Storage Service (S3) behind the scenes. Elastic IP • Persistent allocation of IPv4 address. • Can associate image instance and address dynamically. Quattor in Amazon Cloud — C. Loomis — 11-13 Mar. 2009

  4. AWS vs. Virtual Machines AWS uses Xen, but there are important differences between AWS and direct use of Xen. Network configuration: • All machines have private and public IP addresses. User cannot predict or allocate those addresses before starting the machine. • Network interface uses the private address for configuration. • DNS contains only public address, not private one. • IP address can change when using Elastic IP. Installation: • PXE is not supported for installation of a machine. • Must start from existing machine image. Kernel: • Must use limited list of supported (Xen-enabled) kernels. Quattor in Amazon Cloud — C. Loomis — 11-13 Mar. 2009

  5. Quattor in Cloud Quattor Server (HTTP) quattor.stratuslab.org Profiles Packages Machine profile WN x1 x1.ec2.com Quattor client software Quattor initialization Profile/key information Send site configuration Svn Server sixsq.com Site’s pan config. Profile name SSH key Firefox (ElasticFox) mylaptop.org View of AWS images Quattor in Amazon Cloud — C. Loomis — 11-13 Mar. 2009

  6. Quattor Modifications Standard quattor server deployed and used in AWS. Minor modifications for machine initialization: • Create AWS image with basic quattor client software. • Add init.d script for initial quattor bootstrapping. • “User data” at startup selects image profile. • Fold changes into standard quattor distribution? QWG modifications: • Turn off the network configuration. • Problems with edg-fmon-agent configuration. Quattor in Amazon Cloud — C. Loomis — 11-13 Mar. 2009

  7. Issues and Questions Multiple machines can use the same profile: • Easy and clean way to define only one WN profile for a site. Machine names not known at compilation time: • How to link batch server and clients? • How to link NFS servers and clients? • Allow late binding for some information? Change notifications fail • No link between profile name and machine name. • Allow machines to register for changes? • Move to “chat room” messaging for changes? Workflow • How to manage image disks, IP addresses, etc.? • How to manage machine lifecycle? Quattor in Amazon Cloud — C. Loomis — 11-13 Mar. 2009

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