Graceful shutdown feature

[kvaps]

Description oned should support graceful shutdown feature. Eg. when shutdown of leader requested it should gracefuly transfer leader role to another server, and only after that go offline.

Use case Zero-downtime rolling update

Interface Changes When current leader recieve SIGINT signal it should stop sending raft votes, and continue working until new leader be chosen, then immediately go down.

Additional Context Additionally it also can wait untill all active operations for the VMs be finished.

Progress Status

• [ ] Branch created
• [ ] Code committed to development branch
• [ ] Testing - QA
• [ ] Documentation
• [ ] Release notes - resolved issues, compatibility, known issues
• [ ] Code committed to upstream release/hotfix branches
• [ ] Documentation committed to upstream release/hotfix branches

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions. The OpenNebula Dev Team