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Docker
Docker is an open source project to pack, ship,and run any application as a lightweight, portable, self-sufficient container.When you deploy an app with git push or tsuru app-deploy, tsuru buildsa Docker image and then distributes it as units (Docker containers) acrossyour cluster.
Clusters
A cluster is a named group of nodes. tsuru API has a scheduler algorithm thatdistributes applications intelligently across a cluster of nodes.
Nodes
A node is a physical or virtual machine with Docker installed.
Managed node
A managed node is a node created and managed by tsuru, using IaaSintegration. tsuru manages this node, i.e. tsuru can healand scale it.
Unmanaged node
An unmanaged node is a node created manually, and just registered with tsuru.tsuru is not able to manage these nodes, and it should be handled by whoevercreated it manually.
Applications
An application consists of:
- the program’s source code - e.g.: Python, Ruby, Go, PHP, JavaScript, Java, etc.
- an operating system dependencies list – in a file called
requirements.apt - a language-level dependencies list – e.g.:
requirements.txt,Gemfile, etc. - instructions on how to run the program – in a file called
Procfile
An application has a name, a unique address, a platform, associated developmentteams, a repository, and a set of units.
Units
A unit is a container. A unit has everything an application needs to run; thefetched operational system and language level dependencies, the application’ssource code, the language runtime, and the application’s processes defined inthe Procfile.
Platforms
A platform is a well-defined pack with installed dependencies for a language orframework that a group of applications will need. A platform might be acontainer template (Docker image).
For instance, tsuru has a container image for Python applications, withvirtualenv installed and other required things needed for tsuru to deployapplications on top of that platform. Platforms are easily extendable andmanaged by tsuru. Every application runs on top of a platform.
Services
A service is a well-defined API that tsuru communicates with to provide extrafunctionality for applications. Examples of services are MySQL, Redis, MongoDB,etc. tsuru has built-in services, but it is easy to create and add new servicesto tsuru. Services aren’t managed by tsuru, but by their creators.
