[GitHub] rhtyd opened a new pull request #2508: CLOUDSTACK-9114: Reduce VR downtime during network restart

[GitBox <gi...@apache.org>]

rhtyd opened a new pull request #2508: CLOUDSTACK-9114: Reduce VR downtime during network restart
URL: https://github.com/apache/cloudstack/pull/2508
 
 
   ## Description
   <!--- Describe your changes in detail -->
   
   Note *WIP*, but working for both non-redundant and redundant network VRs :)
   
   Every time there is a major CloudStack version that requires a new systemvmtemplate, admins need to restart VRs which can take few (sometimes several) minutes. The aim of this project is three parts:
   - Reduce systemvmtemplate size, see #2506. Smaller the image size, faster it will be to copy template to primary storage to provision new VR.
   - Perform rolling reboot/deployment of VRs, by provisioning new VRs first and then killing old ones.
   - Make isolated VRs future proof (have keepalived+conntrackd preconfigured TBD)
   - Refactor systemvm python code to speed up VR programming or rule application
   - Speed up iptables and misc rules application from the VR's .json files
   
   Future:
   - Move away from iptables, move to nftables
   - Move away from Python2 codebase to Python3 or something else like Go? TBD
   
   Todos:
   [ ] Implement rolling reboot for VPC based on #2436 
   [ ] Speed up iptables and rules application based on #2083 
   
   <!-- For new features, provide link to FS, dev ML discussion etc. -->
   <!-- In case of bug fix, the expected and actual behaviours, steps to reproduce. -->
   
   ## Types of changes
   <!--- What types of changes does your code introduce? Put an `x` in all the boxes that apply: -->
   - [ ] Breaking change (fix or feature that would cause existing functionality to change)
   - [ ] New feature (non-breaking change which adds functionality)
   - [ ] Bug fix (non-breaking change which fixes an issue)
   - [ ] Enhancement (improves an existing feature and functionality)
   - [ ] Cleanup (Code refactoring and cleanup, that may add test cases)
   
   ## Screenshots (if appropriate):
   
   Screenshot shows ping drops from a guest VM, in a non-redundant isolated network: (2-5 ping drops observed)
   ![screenshot from 2018-03-23 17-53-46](https://user-images.githubusercontent.com/95203/37830985-f4022b92-2ec9-11e8-94e4-9b972a592861.png)
   
   In case of rVRs, 0-1 ping drops are observed
   
   ## How Has This Been Tested?
   
   <!-- Please describe in detail how you tested your changes. -->
   <!-- Include details of your testing environment, and the tests you ran to -->
   <!-- see how your change affects other areas of the code, etc. -->
   
   ## Checklist:
   <!--- Go over all the following points, and put an `x` in all the boxes that apply. -->
   <!--- If you're unsure about any of these, don't hesitate to ask. We're here to help! -->
   - [ ] I have read the [CONTRIBUTING](https://github.com/apache/cloudstack/blob/master/CONTRIBUTING.md) document.
   - [ ] My code follows the code style of this project.
   - [ ] My change requires a change to the documentation.
   - [ ] I have updated the documentation accordingly.
   - [ ] I have added tests to cover my changes.
   - [ ] All new and existing tests passed.
   
   <!-- The following will kick a packaging job, remove if as applicable -->
   @blueorangutan package
   

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