Container scheduling according to preempting a set of preemptable containers deployed in a cluster

A container management system, comprising:

• a machine-readable storage medium storing executable instructions;
• and
• a processing resource coupled to the machine-readable storage medium, wherein the processing resource is configured to execute one or more of the instructions to:
• implement a container scheduler to manage container deployment in a cluster comprising a plurality of member nodes, wherein the plurality of member nodes collectively host a plurality of already-deployed containers;
• and
• implement a scheduling assistance sub-system in communication with the container scheduler, wherein the scheduling assistance sub-system is configured to:
• receive a container deployment request to deploy a container in the cluster, wherein the container deployment request specifies resource requirements for the container;
• responsive to receiving the container deployment request, determine that the container deployment request is assigned a pending status by the container scheduler due to a lack of sufficient available resources in any individual member node of the plurality of member nodes to meet the resource requirements for the container;
• responsive to determining that the container deployment request is assigned the pending status, identify a set of preemptable containers, from the plurality of already-deployed containers, on a member node of the plurality of member nodes based on resource allocations of the plurality of already-deployed containers and the resource requirements of the container;
• preempt the set of preemptable containers on the member node;
• and
• direct the container scheduler to deploy the container on the member node.

A scheduling assistance sub-system, comprising:

• a machine-readable storage medium storing executable instructions;
• and
• a processing resource coupled to the machine-readable storage medium, wherein the processing resource is configured to execute one or more of the instructions to:
• receive a container deployment request to deploy a container in a cluster, wherein the container deployment request specifies resource requirements for the container, and wherein the cluster comprises a plurality of member nodes collectively hosting a plurality of already-deployed containers;
• responsive to receiving the container deployment request, determine that the container deployment request is assigned a pending status due to a lack of sufficient available resources in any individual member node of the plurality of member nodes to meet the resource requirements for the container;
• responsive to determining that the container deployment request is assigned the pending status, identify a set of preemptable containers, from the plurality of already-deployed containers, on a member node of the plurality of member nodes based on resource allocations of the plurality of already-deployed containers and the resource requirements of the container;
• preempt the set of preemptable containers on the member node;
• and
• direct a container scheduler to deploy the container on the member node.