Automatic State Migration of Stateful Container During Secondary Application Container Hot Upgrade

A computer system for secondary application container hot upgrade, the computer system comprising:

• a communication fabric;
• a storage device connected to the communication fabric, wherein the storage device stores program instructions;
• and
• a processor connected to the communication fabric, wherein the processor executes the program instructions to:
• determine whether an upgraded secondary application container is ready to run in a pod that includes a secondary application container, a router container, and a primary application container based on monitoring a status of the upgraded secondary application container;
• direct the router container to send a subsequent external service request to the upgraded secondary application container to manage for the primary application container in response to determining that the upgraded secondary application container is ready to run in the pod based on monitoring the status of the upgraded secondary application container;
• delete the secondary application container from the pod that includes the upgraded secondary application container in response to directing the router container to send the subsequent external service request to the upgraded secondary application container to manage for the primary application container;
• and
• delete the router container from the pod in response to deleting the secondary application container from the pod.

A computer program product for secondary application container hot upgrade, the computer program product comprising a computer-readable storage medium having program instructions embodied therewith, the program instructions executable by a computer to cause the computer to:

• determine whether an upgraded secondary application container is ready to run in a pod that includes a secondary application container, a router container, and a primary application container based on monitoring a status of the upgraded secondary application container;
• direct the router container to send a subsequent external service request to the upgraded secondary application container to manage for the primary application container in response to determining that the upgraded secondary application container is ready to run in the pod based on monitoring the status of the upgraded secondary application container;
• delete the secondary application container from the pod that includes the upgraded secondary application container in response to directing the router container to send the subsequent external service request to the upgraded secondary application container to manage for the primary application container;
• and
• delete the router container from the pod in response to deleting the secondary application container from the pod.