Use Cases This section describes a couple of use cases during autotransfer and auto-install of applications. Table 3: Use Cases for the AutoTransfer and Auto-Install of Applications Native Docker Container: Application Auto-Restart The Application Auto-Restart feature helps applications deployed on platforms to retain the last configured operational state in the event of a system switchover or restart. The underlying hosting framework is also retained during switchovers. This feature is enabled by default, and cannot be disabled by users.
The persistent data of applications is not synchronized; only secure data storage and persistent data that is known to Cisco Application Framework (CAF) is synchronized. IOx media present on the active and standby devices must be in-sync to restart IOx in the same state upon a switchover or system restart. Cisco Catalyst 9300 Series Switches only support Solid State Drive (SSD) for application hosting. When a new SSD is inserted, it needs to be brought up to the same sync state as the others. The standby device must have an SSD that is compatible with IOx for application auto-restart synchronization to work.
The output of the show iox-service command displays the status of the synchronization. The Application Auto-Restart feature is supported only on Cisco Catalyst 9300 Series Switches. Application Auto-Restart Scenarios This section describes various application auto-restart scenarios: Table 4: Application Auto-Restart Scenarios Application Hosting Native Docker Container: Application Auto-Restart Use Case Result SSD is plugged in while IOx is running on flash. If the SSD is plugged in while IOx is already running, there is no impact to the running applications or to IOx.
IOx is migrated to the SSD only when IOx is restarted by disabling and then enabling IOx through the CLI, or due to a system restart. System reboots, while IOx data is being copied to the new media. While IOx data is getting migrated from one media to another, and the system reboots, the migration process will continue, when the system restarts. The data from the old media is deleted only when the copy operation is complete. Scenario Single Media in the Active Device Media in the Active and Standby Devices System bootup Starts IOx and the application at system bootup. The USB SSD is visible immediately because it is a local device. No synchronization happens at this time.
Starts IOx and the application on system bootup. Does a bulk synchronization of the existing information to the standby device. Application Hosting 10