Upgrade of hosts hosting application units of a container-based application based on analysis of the historical workload pattern of the cluster

A non-transitory machine readable medium storing instructions executable by a processing resource of a computer system, the non-transitory machine readable medium comprising instructions to:

• monitor for availability of a new system software component for a cluster of a container orchestration platform, wherein the cluster includes a plurality of hosts each hosting one of a plurality of application units of a container-based application;
• subject to constraints on a frequency of performing upgrades and responsive to the availability of the new system software component:
• analyze a historical workload pattern of the cluster to identify an upgrade window for each of the plurality of hosts;
• when the upgrade window arrives for a host of the plurality of hosts, determine whether reconfiguration of the application is to be performed based on a capacity of the cluster;
• when the determination is affirmative:
• identify a reconfiguration option for the application that allows the application unit of the plurality of application units deployed on the host to be drained from the host while maintaining operability of the application;
• and
• adjust a configuration of the application based on the identified reconfiguration option;
• drain the host;
• remove the host from the cluster;
• upgrade the host based on the new system software component;
• add the host back into the cluster;
• and
• if the determination was affirmative, then revert the configuration of the application.

A system comprising:

• a processing resource;
• and
• a non-transitory computer-readable medium, coupled to the processing resource, having stored therein instructions that when executed by the processing resource cause the processing resource to:
• monitor for availability of a new system software component for a cluster of a container orchestration platform, wherein the cluster includes a plurality of hosts each hosting one of a plurality of application units of a container-based application;
• subject to constraints on a frequency of performing upgrades and responsive to the availability of the new system software component:
• analyze a historical workload pattern of the cluster to identify an upgrade window for each of the plurality of hosts;
• when the upgrade window arrives for a host of the plurality of hosts, determine whether reconfiguration of the application is to be performed based on a capacity of the cluster;
• when the determination is affirmative:
• identify a reconfiguration option for the application that allows the application unit of the plurality of application units deployed on the host to be drained from the host while maintaining operability of the application;
• and
• adjust a configuration of the application based on the identified reconfiguration option;
• drain the host;
• remove the host from the cluster;
• upgrade the host based on the new system software component;
• add the host back into the cluster;
• and
• if the determination was affirmative, then revert the configuration of the application.