Glossary

Namespace:

A Linux namespace is a Linux kernel feature that isolates and virtualizes system resources. Processes which restricted to a namespace can only interact with resources or processes that are part of the same namespace. Namespaces are an important part of Docker’s isolation model.

PID:

A PID (i.e., process identification number) is an identification number that is automatically assigned to each process when it is created on a Unix-like operating system.

Dockerfile:

A text file that contains instructions for how to build a Docker image.

Cluster:

A collection of Docker hosts exposed as if it were a single virtual Docker host, so that the application can scale to multiple instances of the services spread across multiple hosts within the cluster.

Orchestrator:

A tool that simplifies management of clusters and Docker hosts. Orchestrators enable you to manage their images, containers, and hosts through a command line interface (CLI) or a graphical UI. You can manage container networking, configurations, load balancing, service discovery, high availability, Docker host configuration, and more. An orchestrator is responsible for running, distributing, scaling, and healing workloads across a collection of nodes.