README
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balenaEngine: Moby-based container engine for IoT
Overview
balenaEngine is a new container engine purpose-built for embedded and IoT use cases and compatible with Docker containers. Based on Docker’s Moby Project, balenaEngine supports container deltas for 10-70x more efficient bandwidth usage, has 3x smaller binaries, uses RAM and storage more conservatively, and focuses on atomicity and durability of container pulling.
Features
- Small footprint
- 3.5x smaller than Docker CE, packaged as a single binary
- Multi-arch support
- Available for a wide variety of chipset architectures, supporting everything from tiny IoT devices to large industrial gateways
- True container deltas
- Bandwidth-efficient updates with binary diffs, 10-70x smaller than pulling layers
- Minimal wear-and-tear
- Extract layers as they arrive to prevent excessive writing to disk, protecting your storage from eventual corruption
- Failure-resistant pulls
- Atomic and durable image pulls defend against partial container pulls in the event of power failure
- Conservative memory use
- Prevents page cache thrashing during image pull, so your application runs undisturbed in low-memory situations
Transitioning from Docker CE
We left out Docker features that we saw as most needed in cloud deployments and therefore not warranting inclusion in a lightweight IoT-focused container engine. Specifically, we’ve excluded:
- Docker Swarm
- Cloud logging drivers
- Plugin support
- Overlay networking drivers
- Non-boltdb discovery backends (consul, zookeeper, etcd, etc.)
Unless you depend on one of the features in Docker that balenaEngine omits, using balenaEngine should be a drop-in replacement.
Licensing
balenaEngine is licensed under the Apache License, Version 2.0. See LICENSE for the full license text.
Directories
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| Path | Synopsis |
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errdefs
Package errdefs defines a set of error interfaces that packages should use for communicating classes of errors.
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Package errdefs defines a set of error interfaces that packages should use for communicating classes of errors. |
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types
Package types is used for API stability in the types and response to the consumers of the API stats endpoint.
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Package types is used for API stability in the types and response to the consumers of the API stats endpoint. |
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types/backend
Package backend includes types to send information to server backends.
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Package backend includes types to send information to server backends. |
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types/filters
Package filters provides tools for encoding a mapping of keys to a set of multiple values.
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Package filters provides tools for encoding a mapping of keys to a set of multiple values. |
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types/plugins/logdriver
Package logdriver is a generated protocol buffer package.
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Package logdriver is a generated protocol buffer package. |
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types/swarm/runtime
Package runtime is a generated protocol buffer package.
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Package runtime is a generated protocol buffer package. |
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types/versions/v1p19
Package v1p19 provides specific API types for the API version 1, patch 19.
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Package v1p19 provides specific API types for the API version 1, patch 19. |
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types/versions/v1p20
Package v1p20 provides specific API types for the API version 1, patch 20.
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Package v1p20 provides specific API types for the API version 1, patch 20. |
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Package builder defines interfaces for any Docker builder to implement.
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Package builder defines interfaces for any Docker builder to implement. |
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dockerfile
Package dockerfile is the evaluation step in the Dockerfile parse/evaluate pipeline.
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Package dockerfile is the evaluation step in the Dockerfile parse/evaluate pipeline. |
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dockerfile/command
Package command contains the set of Dockerfile commands.
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Package command contains the set of Dockerfile commands. |
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dockerfile/parser
Package parser implements a parser and parse tree dumper for Dockerfiles.
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Package parser implements a parser and parse tree dumper for Dockerfiles. |
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remotecontext
Package remotecontext is a generated protocol buffer package.
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Package remotecontext is a generated protocol buffer package. |
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Package client is a Go client for the Docker Engine API.
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Package client is a Go client for the Docker Engine API. |
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cmd
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contrib
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Package daemon exposes the functions that occur on the host server that the Docker daemon is running.
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Package daemon exposes the functions that occur on the host server that the Docker daemon is running. |
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logger
Package logger defines interfaces that logger drivers implement to log messages.
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Package logger defines interfaces that logger drivers implement to log messages. |
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logger/awslogs
Package awslogs provides the logdriver for forwarding container logs to Amazon CloudWatch Logs
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Package awslogs provides the logdriver for forwarding container logs to Amazon CloudWatch Logs |
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logger/etwlogs
Package etwlogs provides a log driver for forwarding container logs as ETW events.(ETW stands for Event Tracing for Windows) A client can then create an ETW listener to listen for events that are sent by the ETW provider that we register, using the provider's GUID "a3693192-9ed6-46d2-a981-f8226c8363bd".
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Package etwlogs provides a log driver for forwarding container logs as ETW events.(ETW stands for Event Tracing for Windows) A client can then create an ETW listener to listen for events that are sent by the ETW provider that we register, using the provider's GUID "a3693192-9ed6-46d2-a981-f8226c8363bd". |
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logger/fluentd
Package fluentd provides the log driver for forwarding server logs to fluentd endpoints.
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Package fluentd provides the log driver for forwarding server logs to fluentd endpoints. |
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logger/gelf
Package gelf provides the log driver for forwarding server logs to endpoints that support the Graylog Extended Log Format.
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Package gelf provides the log driver for forwarding server logs to endpoints that support the Graylog Extended Log Format. |
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logger/journald
Package journald provides the log driver for forwarding server logs to endpoints that receive the systemd format.
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Package journald provides the log driver for forwarding server logs to endpoints that receive the systemd format. |
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logger/jsonfilelog
Package jsonfilelog provides the default Logger implementation for Docker logging.
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Package jsonfilelog provides the default Logger implementation for Docker logging. |
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logger/logentries
Package logentries provides the log driver for forwarding server logs to logentries endpoints.
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Package logentries provides the log driver for forwarding server logs to logentries endpoints. |
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logger/splunk
Package splunk provides the log driver for forwarding server logs to Splunk HTTP Event Collector endpoint.
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Package splunk provides the log driver for forwarding server logs to Splunk HTTP Event Collector endpoint. |
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logger/syslog
Package syslog provides the logdriver for forwarding server logs to syslog endpoints.
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Package syslog provides the logdriver for forwarding server logs to syslog endpoints. |
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Package dockerversion is auto-generated at build-time
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Package dockerversion is auto-generated at build-time |
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hack
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Package integration provides integrations tests for Moby (API).
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Package integration provides integrations tests for Moby (API). |
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integration-cli
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checker
Package checker provides Docker specific implementations of the go-check.Checker interface.
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Package checker provides Docker specific implementations of the go-check.Checker interface. |
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internal
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Package layer is package for managing read-only and read-write mounts on the union file system driver.
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Package layer is package for managing read-only and read-write mounts on the union file system driver. |
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migrate
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pkg
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aaparser
Package aaparser is a convenience package interacting with `apparmor_parser`.
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Package aaparser is a convenience package interacting with `apparmor_parser`. |
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filenotify
Package filenotify provides a mechanism for watching file(s) for changes.
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Package filenotify provides a mechanism for watching file(s) for changes. |
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locker
Package locker provides a mechanism for creating finer-grained locking to help free up more global locks to handle other tasks.
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Package locker provides a mechanism for creating finer-grained locking to help free up more global locks to handle other tasks. |
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parsers
Package parsers provides helper functions to parse and validate different type of string.
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Package parsers provides helper functions to parse and validate different type of string. |
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parsers/kernel
Package kernel provides helper function to get, parse and compare kernel versions for different platforms.
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Package kernel provides helper function to get, parse and compare kernel versions for different platforms. |
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parsers/operatingsystem
Package operatingsystem provides helper function to get the operating system name for different platforms.
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Package operatingsystem provides helper function to get the operating system name for different platforms. |
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pidfile
Package pidfile provides structure and helper functions to create and remove PID file.
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Package pidfile provides structure and helper functions to create and remove PID file. |
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platform
Package platform provides helper function to get the runtime architecture for different platforms.
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Package platform provides helper function to get the runtime architecture for different platforms. |
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plugins
Package plugins provides structures and helper functions to manage Docker plugins.
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Package plugins provides structures and helper functions to manage Docker plugins. |
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pools
Package pools provides a collection of pools which provide various data types with buffers.
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Package pools provides a collection of pools which provide various data types with buffers. |
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signal
Package signal provides helper functions for dealing with signals across various operating systems.
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Package signal provides helper functions for dealing with signals across various operating systems. |
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streamformatter
Package streamformatter provides helper functions to format a stream.
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Package streamformatter provides helper functions to format a stream. |
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stringid
Package stringid provides helper functions for dealing with string identifiers
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Package stringid provides helper functions for dealing with string identifiers |
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tailfile
Package tailfile provides helper functions to read the nth lines of any ReadSeeker.
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Package tailfile provides helper functions to read the nth lines of any ReadSeeker. |
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tarsum
Package tarsum provides algorithms to perform checksum calculation on filesystem layers.
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Package tarsum provides algorithms to perform checksum calculation on filesystem layers. |
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term
Package term provides structures and helper functions to work with terminal (state, sizes).
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Package term provides structures and helper functions to work with terminal (state, sizes). |
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truncindex
Package truncindex provides a general 'index tree', used by Docker in order to be able to reference containers by only a few unambiguous characters of their id.
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Package truncindex provides a general 'index tree', used by Docker in order to be able to reference containers by only a few unambiguous characters of their id. |
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urlutil
Package urlutil provides helper function to check urls kind.
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Package urlutil provides helper function to check urls kind. |
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useragent
Package useragent provides helper functions to pack version information into a single User-Agent header.
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Package useragent provides helper functions to pack version information into a single User-Agent header. |
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profiles
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Package registry contains client primitives to interact with a remote Docker registry.
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Package registry contains client primitives to interact with a remote Docker registry. |
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local
Package local provides the default implementation for volumes.
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Package local provides the default implementation for volumes. |
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