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OpenShift is a family of containerization software products ... This level of control enables the cluster to support upgrades and patches of the control plane nodes ...
High-availability cluster. Apache Mesos, from the Apache Software Foundation; Kubernetes, founded by Google Inc, from the Cloud Native Computing Foundation; Heartbeat, from Linux-HA
The API server uses etcd's watch API to monitor the cluster, roll out critical configuration changes, or restore any divergences of the state of the cluster back to the desired state as declared in etcd. As an example, a human operator may specify that three instances of a particular "pod" (see below) need to be running, and etcd stores this fact.
Container clusters need to be managed. This includes functionality to create a cluster, to upgrade the software or repair it, balance the load between existing instances, scale by starting or stopping instances to adapt to the number of users, to log activities and monitor produced logs or the application itself by querying sensors.
Proxmox VE supports live migration for guest machines between nodes in the scope of a single cluster, which allows smooth migration without interrupting their services. [18] Since PVE 7.3 there is an experimental feature for migration between unrelated nodes in different clusters. [19]
Container Linux provides no package manager as a way for distributing payload applications, requiring instead all applications to run inside their containers. Serving as a single control host, a Container Linux instance uses the underlying operating-system-level virtualization features of the Linux kernel to create and configure multiple containers that perform as isolated Linux systems.
Singularity is a free and open-source computer program that performs operating-system-level virtualization also known as containerization. [4]One of the main uses of Singularity is to bring containers and reproducibility to scientific computing and the high-performance computing (HPC) world.
OpenShift: Yes No No Yes OpenStack: Yes No Yes Yes OnApp: Yes No No Yes oVirt: Yes No No Yes Supported guests. Software Linux Windows VMware Xen KVM VirtualBox Docker