We can have multiple instances of the same service or just different services altogether running on a single machine. Docker containers are self-contained and isolated. Since each Docker container has its own virtual Ethernet IP address, there are no port conflicts. When running containers, it's often desired to have more than one container deployed for load balancing needs. There are full-scale solutions, such as Docker Swarm or Kubernetes, for the production of grade container orchestration, which greatly help. Multiple containers can also help when one of the services/containers is not responding or needs to be replaced. The speed by which you spawn new containers and add them to the cluster of containers will matter.
If you are running containers on a single machine and want to spawn another instance of ims-issues, then you need...
