Latest revision as of 10:19, 15 November 2011

pacemaker-cloud

Summary

The pacemaker-cloud project demonstrates the current community work in providing application service high availability in a cloud environment.

Owner

Name: Steven Dake

Email: <sdake@redhat.com>

Current status

Targeted release: Fedora 16
Last updated: (July 20th, 2011)
Percentage of completion: 100%

Detailed Description

The software provides a user interface shell called pcloudsh which provides:

Create deployables including:
- Create a JEOS image of F14, F15, F16, RHEL6
- Create an assembly of F14, F15, F16, RHEL6
- Add assemblies to a deployable
- Add managed resources to an assembly
Launch a deployable, including all of its assembly images
Provides user interface feedback when an application or assembly fails and describe which corrective actions are taken.

The software provides daemons and init scripts which provide high availability of the deployables configured in the system:

Kill/restart applications if a failure is detected.
Kill and restart assemblies if an assembly failure is detected.

Nomenclature:

JEOS - just enough operating system - the bare minimum operating system required to boot a virtual machine image
Assembly - Composition of a JEOS image and managed resources
Deployable - Collection of assemblies that represent all virtual machines required to provide a specific service
Resource - Daemon application, such as Apache's httpd service, which is managed for high availability
high availability - Applying the techniques of:
- monitoring a component for failure
- forcibly terminating a component when a failure has been detected
- restarting the failed component
- providing notification to system administration so they may repair the underlying fault
- See Pacemaker Cloud Project Slides for more details.

Benefit to Fedora

This feature provides a preview of high availability for cloud environments using a building block that is reusable in other cloud management systems. This feature provides only single node deployable high availability, but for F17 we plan to integrate with other distributed cloud management tools such as Aeolus.

Scope

This is a standalone package but has several dependencies on other parts of Fedora 16. We are in good shape relatng to dependencies, however, systemd is not LSB compliant currently resulting in our software not being able to provide high availability for F15 or Rawhide guests.

We are nearing code completion for the single node case and have some basic packaging done.

How To Test

setenforce 0 (we are working on this)
configure firewall to allow communication via TCP port 49000 or disable firewall
yum install pacemaker-cloud
systemctl start pcloud-cped.service

We have a test suite that can be run which provides automated validation the software functions properly.

Manually the following operations can be done:

root# pcloudsh
pcloudsh# jeos_create F14 x86_64
pcloudsh# assembly_create assy1 F14 x86_64
pcloudsh# assembly_clone assy1 assy2
pcloudsh# assembly_clone assy1 assy3
pcloudsh# assembly_resource_add httpdone httpd assy1
pcloudsh# assembly_resource_add httpdtwo httpd assy2
pcloudsh# assembly_resource_add httpdthree httpd assy3
pcloudsh# deployable_create dep1
pcloudsh# deployable_assembly_add dep1 assy1
pcloudsh# deployable_assembly_add dep1 assy2
pcloudsh# deployable_assembly_add dep1 assy3
pcloudsh# deployable_start dep1

Keep pcloudsh running and in another shell:

verify application restart works properly:
1. login to one of the assemblies and killall -9 httpd
2. verify that httpd is restarted via pacemaker-cloud
verify deployable restart works properly:
1. Open the virtual machine manager GUI
2. Use the force off functionality on an assembly
3. The virtual machine manager should display that the assembly is restarted
4. Login to the restarted virtual machine and verify httpd was restarted properly
verify pcloudsh displays feedback
1. verify failed applications indicate they are failed and restarted
2. verify failed assemblies indicate they are failed and restarted

User Experience

The audience will notice a shell with comands which can be used to create, launch, and monitor deployables single node.

Dependencies

Previously packaged in Fedora rawhide:

glib2
dbus-glib
libxml2
libuuid
libqb
pacemaker-libs
qmf
libxslt
qpid-cpp-server
qpid-cpp-client
python-qmf
matahari-service
matahari-host
libqb
oz
systemd

Dependency with broken functionality: systemd - systemd guests don't work properly because systemd is not LSB compliant. A patch to resolve this issue has been merged upstream and tested working with the current pacemaker-cloud code in a f15 JEOS + upstream patch on top of latest rawhide systemd rpm.

Contingency Plan

If this feature is not ready by July 26, it can moved to a later Fedora version. If systemd is not LSB compliant by July 26, appropriate release notes should indicate that systemd is in the progress of updating its build with upstream packages. More then likely this will just be fixed as part of f16 release of systemd.

Documentation

Project Page

Developer Resources

Pacemaker Cloud Project Slides

Release Notes

Pacemaker-Cloud provides high availability for application services inside virtual machines on a single node. This feature provides a shell for creating virtual machine images, associating resources with the virtual machines, and combining these images into a deployable. A deployable can then be launched and monitored for high availability. If virtual machines or applications fail, these components will be restarted reducing MTTR (mean time to repair) improving availability over manual operator restart.

Fedora guest virtual machines using systemd are currently non-functional until the following bugzilla is merged into rawhide: See systemd defect 702621 discussion.

Comments and Discussion

See Talk:Features/pacemaker-cloud

@@ Line 1: / Line 1: @@
-{{admon/important | Comments and Explanations | The page source contains comments providing guidance to fill out each section.  They are invisible when viewing this page.  To read it, choose the "edit" link.<br/> '''Copy the source to a ''new page'' before making changes!  DO NOT EDIT THIS TEMPLATE FOR YOUR FEATURE.'''}}
-{{admon/important | Set a Page Watch| Make sure you click ''watch'' on your new page so that you are notified of changes to it by others, including the Feature Wrangler}}
-{{admon/note | All sections of this template are required for review by FESCo.  If any sections are empty it will not be reviewed }}
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@@ Line 27: / Line 20: @@
 == Current status ==
 * Targeted release: [[Releases/16 | Fedora 16 ]]
-* Last updated: (May 26, 2011)
+* Last updated: (July 20th, 2011)
-* Percentage of completion: 75%
+* Percentage of completion: 100%
 <!-- CHANGE THE "FedoraVersion" TEMPLATES ABOVE TO PLAIN NUMBERS WHEN YOU COMPLETE YOUR PAGE. -->
@@ Line 69: / Line 63: @@
 == How To Test ==
+<pre>
+setenforce 0 (we are working on this)
+configure firewall to allow communication via TCP port 49000 or disable firewall
 yum install pacemaker-cloud
-chkconfig pacemaker-cloud on
+systemctl start pcloud-cped.service
-service pacemaker-cloud start
+</pre>
 We have a test suite that can be run which provides automated validation the software functions properly.
@@ Line 82: / Line 79: @@
 pcloudsh# assembly_clone assy1 assy2
 pcloudsh# assembly_clone assy1 assy3
-pcloudsh# assembly_resource_add httpd httpd assy1
+pcloudsh# assembly_resource_add httpdone httpd assy1
-pcloudsh# assembly_resource_add httpd httpd assy2
+pcloudsh# assembly_resource_add httpdtwo httpd assy2
-pcloudsh# assembly_resource_add httpd httpd assy3
+pcloudsh# assembly_resource_add httpdthree httpd assy3
 pcloudsh# deployable_create dep1
 pcloudsh# deployable_assembly_add dep1 assy1
@@ Line 117: / Line 114: @@
 dbus-glib
 libxml2
+libuuid
 libqb
-pacemaker-libs and its many dependencies
+pacemaker-libs
 qmf
 libxslt
 qpid-cpp-server
 qpid-cpp-client
-python-qpid-qmf
+python-qmf
+matahari-service
+matahari-host
+libqb
+oz
+systemd
 </pre>
-Needs packaging in Fedora rawhide:
-<pre>oz (currently under review)</pre>
 Dependency with broken functionality:
-systemd - systemd guests don't work properly because systemd is not LSB compliant.  F14 and RHEL6 guests will work properly, but without bug fixing in systemd, F15 and F16 are nonfunctional.
+systemd - systemd guests don't work properly because systemd is not LSB compliant.  A patch to resolve this issue has been merged upstream and tested working with the current pacemaker-cloud code in a f15 JEOS + upstream patch on top of latest rawhide systemd rpm.
 == Contingency Plan ==
 <!-- If you cannot complete your feature by the final development freeze, what is the backup plan?  This might be as simple as "None necessary, revert to previous release behaviour."  Or it might not.  If you feature is not completed in time we want to assure others that other parts of Fedora will not be in jeopardy.  -->
-If this feature is not ready by July 22, it can moved to a later Fedora version.  If systemd is not LSB compliant by July 22, appropriate release notes should indicate that systemd guests are non-functional.
+If this feature is not ready by July 26, it can moved to a later Fedora version.  If systemd is not LSB compliant by July 26, appropriate release notes should indicate that systemd is in the progress of updating its build with upstream packages.  More then likely this will just be fixed as part of f16 release of systemd.
 == Documentation ==
 <!-- Is there upstream documentation on this feature, or notes you have written yourself?  Link to that material here so other interested developers can get involved. -->
-https://github.com/pacemaker-cloud/pacemaker-cloud
+[http://www.pacemaker-cloud.org Project Page]
+[https://github.com/pacemaker-cloud/pacemaker-cloud Developer Resources]
+[http://www.redhat.com/summit/2011/presentations/summit/whats_new/thursday/dake_th_1130_high_availability_in_the_cloud.pdf Pacemaker Cloud Project Slides]
 == Release Notes ==
 <!-- The Fedora Release Notes inform end-users about what is new in the release.  Examples of past release notes are here: http://docs.fedoraproject.org/release-notes/ -->
 <!-- The release notes also help users know how to deal with platform changes such as ABIs/APIs, configuration or data file formats, or upgrade concerns.  If there are any such changes involved in this feature, indicate them here.  You can also link to upstream documentation if it satisfies this need.  This information forms the basis of the release notes edited by the documentation team and shipped with the release. -->
-Guests using systemd are non-funtional with this feature and that fact may need release notes as to not confuse the audience.
+Pacemaker-Cloud provides high availability for application services inside virtual machines on a single node.  This feature provides a shell for creating virtual machine images, associating resources with the virtual machines, and combining these images into a deployable.  A deployable can then be launched and monitored for high availability.  If virtual machines or applications fail, these components will be restarted reducing MTTR (mean time to repair) improving availability over manual operator restart.
+Fedora ''guest virtual machines using systemd'' are currently non-functional until the following bugzilla is merged into rawhide: See [https://bugzilla.redhat.com/show_bug.cgi?id=702621 systemd defect 702621] discussion.
 == Comments and Discussion ==
@@ Line 150: / Line 157: @@
-[[Category:FeaturePageIncomplete]]
+[[Category:FeatureAcceptedF16]]
 <!-- When your feature page is completed and ready for review -->
 <!-- remove Category:FeaturePageIncomplete and change it to Category:FeatureReadyForWrangler -->
 <!-- After review, the feature wrangler will move your page to Category:FeatureReadyForFesco... if it still needs more work it will move back to Category:FeaturePageIncomplete-->
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