Logical Overlay Network Rollback Integrity Checking
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Solution Overview
Problem
Existing techniques for rolling back a logical overlay network after an upgrade are inefficient, especially in environments with hundreds or thousands of components, making it challenging to effectively revert to a previous state to debug or re-deploy changes.
Innovation Solution
A method is introduced that includes a rollback capability for a logical overlay network, where upgrades are performed in an automated and ordered manner, and rollbacks are executed in reverse order, with data and configuration integrity checking to ensure the system returns to its pre-upgrade state, utilizing rollback scripts and a rollback service to manage the process across management plane, control plane, and data plane components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing rollback techniques are used in logical overlay networks with hundreds or thousands of components, then the rollback process can be performed, but the efficiency and effectiveness of the rollback are poor
Solution Approach 1:
The rollback process is segmented into distinct phases: identification of components to be rolled back, execution of rollback operations in reverse order of upgrade, and post-rollback integrity verification. This segmentation enables systematic management of large-scale network rollbacks by breaking down the complex process into manageable steps that can be automated and tracked independently.
Solution Approach 2:
Before performing the rollback, the system performs preliminary actions including identifying all components that were upgraded, determining the reverse order of rollback based on upgrade dependencies, and preparing rollback scripts for each component. This preliminary preparation ensures that the actual rollback execution is efficient and can handle large-scale networks without delays during the critical rollback phase.
2Loss of time
If manual rollback methods are used to revert logical overlay network components, then the network can be returned to previous state, but the process is time-consuming and inefficient
Solution Approach 1:
The rollback system performs self-service through automated script execution that identifies components, determines rollback order, executes rollbacks, and verifies integrity without manual intervention. The system automatically generates and executes rollback scripts for each component in the correct reverse order, eliminating the need for operators to manually track and revert each component individually, thus dramatically reducing rollback time while maintaining operational simplicity.
Solution Approach 2:
The system changes the operational parameters of rollback by transitioning from manual, component-by-component reversion to an automated process that uses upgrade metadata and dependency information to determine optimal rollback sequences. This parameter change enables the system to efficiently manage rollback across hundreds or thousands of components by dynamically adjusting the rollback order based on upgrade relationships rather than following a fixed manual procedure.
3Reliability
If rollback is performed without integrity checking, then the process is faster, but data and configuration integrity cannot be ensured
Solution Approach 1:
The system implements feedback through post-rollback integrity verification that checks whether components have been successfully reverted to their previous state. After executing rollback operations, the system verifies data and configuration integrity by comparing current component states against known good states from before the upgrade. This feedback mechanism ensures reliability by detecting any incomplete or failed rollbacks, allowing for corrective action while maintaining overall process efficiency through automated verification.
Data Source
AI summary
A rollback can be performed after completing an upgrade to components of a virtualized computing environment. When the upgrade is performed, an upgrade bundle having rollback scripts is provided to edges, hosts, and managers in the virtualized computing environment that are to be upgraded. When a rollback is to be performed, the rollback scripts are executed, and the components are rolled back in a reverse order relative to their upgrade order. Data and configuration checking are performed to validate the results of the rollback.