GabrielBrascher opened a new pull request #4978: URL: https://github.com/apache/cloudstack/pull/4978
### Description Currently, KVM HA implementation works only if the cluster has at least one primary storage served via NFS. This is due to the NFS heartbeat script used to check if the host is healthy. This implementation adds health checks that work regardless of a storage pool. This is done via a Java client that checks Agent status via a webserver. The additional webserver exposes a simple JSON API that returns a list of Virtual Machines that are running on that host according to Libvirt. This way, KVM HA can verify, via Libvirt, VMs status with HTTP-call to this simple webserver and determine if the host is actually down or if it is just the Java Agent which has crashed. <!--- Describe your changes in DETAIL - And how has behaviour functionally changed. --> <!-- For new features, provide link to FS, dev ML discussion etc. --> <!-- In case of bug fix, the expected and actual behaviours, steps to reproduce. --> <!-- When "Fixes: #<id>" is specified, the issue/PR will automatically be closed when this PR gets merged --> <!-- For addressing multiple issues/PRs, use multiple "Fixes: #<id>" --> <!-- Fixes: # --> <!--- ********************************************************************************* --> <!--- NOTE: AUTOMATATION USES THE DESCRIPTIONS TO SET LABELS AND PRODUCE DOCUMENTATION. --> <!--- PLEASE PUT AN 'X' in only **ONE** box --> <!--- ********************************************************************************* --> ### Types of changes - [ ] Breaking change (fix or feature that would cause existing functionality to change) - [x] 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) ### Feature/Enhancement Scale or Bug Severity #### Feature/Enhancement Scale - [x] Major - [ ] Minor <!-- ### How Has This Been Tested? --> -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected]
