kompose/docs/conversion.md

Conversion Matrix

This document outlines all possible conversion details regarding docker-compose.yaml values to Kubernetes / OpenShift artifacts. This covers major versions of Docker Compose such as 1, 2 and 3.

The current table covers all current possible Docker Compose keys.

Note: due to the fast-pace nature of Docker Compose version revisions, minor versions such as 2.1, 2.2, 3.1, 3.2 or 3.3 are not supported until they are cut into a major version release such as 2 or 3.

Glossary:

• ✓: Converts
• -: Not in this Docker Compose Version
• n: Not yet implemented
• x: Not applicable / no 1-1 conversion

Keys	V1	V2	V3	Kubernetes / OpenShift	Notes
build	✓	✓	✓		Builds/Pushes to Docker repository. See --build parameter
build: context	✓	✓	✓
build: dockerfile	✓	✓	✓
build: args	n	n	n
build: cache_from	-	-	n
cap_add, cap_drop	✓	✓	✓	Pod.Spec.Container.SecurityContext.Capabilities.Add/Drop
command	✓	✓	✓	Pod.Spec.Container.Command
configs	n	n	n
configs: short-syntax	n	n	n
configs: long-syntax	n	n	n
cgroup_parent	x	x	x		Not supported within Kubernetes. See issue https://github.com/kubernetes/kubernetes/issues/11986
container_name	✓	✓	✓	Metadata.Name + Deployment.Spec.Containers.Name
credential_spec	x	x	x		Only applicable to Windows containers
deploy	-	-	✓
deploy: mode	-	-	✓
deploy: replicas	-	-	✓	Deployment.Spec.Replicas / DeploymentConfig.Spec.Replicas
deploy: placement	-	-	✓	Pod.Spec.NodeSelector
deploy: update_config	-	-	n
deploy: resources	-	-	✓	Containers.Resources.Limits.Memory / Containers.Resources.Limits.CPU	Support for memory as well as cpu
deploy: restart_policy	-	-	✓	Pod generation	This generated a Pod, see the user guide on restart
deploy: labels	-	-	n
devices	x	x	x		Not supported within Kubernetes, See issue https://github.com/kubernetes/kubernetes/issues/5607
depends_on	x	x	x
dns	x	x	x		Not used within Kubernetes. Kubernetes uses a managed DNS server
dns_search	x	x	x		See dns key
tmpfs	✓	✓	✓	Pod.Spec.Containers.Volumes.EmptyDir	Creates emptyDirvolume with medium set to Memory & mounts given directory inside container
entrypoint	✓	✓	✓	Pod.Spec.Container.Command	Same as command
env_file	n	n	✓
environment	✓	✓	✓	Pod.Spec.Container.Env
expose	✓	✓	✓	Service.Spec.Ports
extends	✓	✓	✓		Extends by utilizing the same image supplied
external_links	x	x	x		Kubernetes uses a flat-structure for all containers and thus external_links does not have a 1-1 conversion
extra_hosts	n	n	n
group_add	✓	✓	✓
healthcheck	-	n	✓
image	✓	✓	✓	Deployment.Spec.Containers.Image
isolation	x	x	x		Not applicable as this applies to Windows with HyperV support
labels	✓	✓	✓	Metadata.Annotations
links	x	x	x		All containers in the same pod are accessible in Kubernetes
logging	x	x	x		Kubernetes has built-in logging support at the node-level
network_mode	x	x	x		Kubernetes uses it's own cluster networking
networks	x	x	x		See networks key
networks: aliases	x	x	x		See networks key
networks: addresses	x	x	x		See networks key
pid	✓	✓	✓	Pod.Spec.HostPID
ports	✓	✓	✓	Service.Spec.Ports
ports: short-syntax	✓	✓	✓	Service.Spec.Ports
ports: long-syntax	-	-	✓	Service.Spec.Ports
secrets	-	-	n
secrets: short-syntax	-	-	n
secrets: long-syntax	-	-	n
security_opt	x	x	x		Kubernetes uses it's own container naming scheme
stop_grace_period	✓	✓	✓	Pod.Spec.TerminationGracePeriodSeconds
stop_signal	x	x	x		Not supported within Kubernetes. See issue https://github.com/kubernetes/kubernetes/issues/30051
sysctls	n	n	n
ulimits	x	x	x		Not supported within Kubernetes. See issue https://github.com/kubernetes/kubernetes/issues/3595
userns_mode	x	x	x		Not supported within Kubernetes and ignored in Docker Compose Version 3
volumes	✓	✓	✓	PersistentVolumeClaim	Creates a PersistentVolumeClaim. Can only be created if there is already a PersistentVolume within the cluster
volumes: short-syntax	✓	✓	✓	PersistentVolumeClaim	Creates a PersistentVolumeClaim. Can only be created if there is already a PersistentVolume within the cluster
volumes: long-syntax	-	-	✓	PersistentVolumeClaim	Creates a PersistentVolumeClaim. Can only be created if there is already a PersistentVolume within the cluster
restart	✓	✓	✓
Volume	x	x	x
driver	x	x	x
driver_opts	x	x	x
external	x	x	x
labels	x	x	x
Network	x	x	x
driver	x	x	x
driver_opts	x	x	x
enable_ipv6	x	x	x
ipam	x	x	x
internal	x	x	x
labels	x	x	x
external	x	x	x