---
title: "Engine API version history"
description: "Documentation of changes that have been made to Engine API."
keywords: "API, Docker, rcli, REST, documentation"
---

<!-- This file is maintained within the docker/docker Github
     repository at https://github.com/docker/docker/. Make all
     pull requests against that repo. If you see this file in
     another repository, consider it read-only there, as it will
     periodically be overwritten by the definitive file. Pull
     requests which include edits to this file in other repositories
     will be rejected.
-->

## v1.25 API changes

[Docker Engine API v1.25](v1.25.md) documentation

* The API version is now required in all API calls. Instead of just requesting, for example, the URL `/containers/json`, you must now request `/v1.25/containers/json`.
* `GET /version` now returns `MinAPIVersion`.
* `POST /build` accepts `networkmode` parameter to specify network used during build.
* `GET /images/(name)/json` now returns `OsVersion` if populated
* `GET /info` now returns `Isolation`.
* `POST /containers/create` now takes `AutoRemove` in HostConfig, to enable auto-removal of the container on daemon side when the container's process exits.
* `GET /containers/json` and `GET /containers/(id or name)/json` now return `"removing"` as a value for the `State.Status` field if the container is being removed. Previously, "exited" was returned as status.
* `GET /containers/json` now accepts `removing` as a valid value for the `status` filter.
* `GET /containers/json` now supports filtering containers by `health` status.
* `DELETE /volumes/(name)` now accepts a `force` query parameter to force removal of volumes that were already removed out of band by the volume driver plugin.
* `POST /containers/create/` and `POST /containers/(name)/update` now validates restart policies.
* `POST /containers/create` now validates IPAMConfig in NetworkingConfig, and returns error for invalid IPv4 and IPv6 addresses (`--ip` and `--ip6` in `docker create/run`).
* `POST /containers/create` now takes a `Mounts` field in `HostConfig` which replaces `Binds`, `Volumes`, and `Tmpfs`. *note*: `Binds`, `Volumes`, and `Tmpfs` are still available and can be combined with `Mounts`.
* `POST /build` now performs a preliminary validation of the `Dockerfile` before starting the build, and returns an error if the syntax is incorrect. Note that this change is _unversioned_ and applied to all API versions.
* `POST /build` accepts `cachefrom` parameter to specify images used for build cache.
* `GET /networks/` endpoint now correctly returns a list of *all* networks,
  instead of the default network if a trailing slash is provided, but no `name`
  or `id`.
* `DELETE /containers/(name)` endpoint now returns an error of `removal of container name is already in progress` with status code of 400, when container name is in a state of removal in progress.
* `GET /containers/json` now supports a `is-task` filter to filter
  containers that are tasks (part of a service in swarm mode).
* `POST /containers/create` now takes `StopTimeout` field.
* `POST /services/create` and `POST /services/(id or name)/update` now accept `Monitor` and `MaxFailureRatio` parameters, which control the response to failures during service updates.
* `POST /services/(id or name)/update` now accepts a `ForceUpdate` parameter inside the `TaskTemplate`, which causes the service to be updated even if there are no changes which would ordinarily trigger an update.
* `POST /services/create` and `POST /services/(id or name)/update` now return a `Warnings` array.
* `GET /networks/(name)` now returns field `Created` in response to show network created time.
* `POST /containers/(id or name)/exec` now accepts an `Env` field, which holds a list of environment variables to be set in the context of the command execution.
* `GET /volumes`, `GET /volumes/(name)`, and `POST /volumes/create` now return the `Options` field which holds the driver specific options to use for when creating the volume.
* `GET /exec/(id)/json` now returns `Pid`, which is the system pid for the exec'd process.
* `POST /containers/prune` prunes stopped containers.
* `POST /images/prune` prunes unused images.
* `POST /volumes/prune` prunes unused volumes.
* `POST /networks/prune` prunes unused networks.
* Every API response now includes a `Docker-Experimental` header specifying if experimental features are enabled (value can be `true` or `false`).
* Every API response now includes a `API-Version` header specifying the default API version of the server.
* The `hostConfig` option now accepts the fields `CpuRealtimePeriod` and `CpuRtRuntime` to allocate cpu runtime to rt tasks when `CONFIG_RT_GROUP_SCHED` is enabled in the kernel.
* The `SecurityOptions` field within the `GET /info` response now includes `userns` if user namespaces are enabled in the daemon.
* `GET /nodes` and `GET /node/(id or name)` now return `Addr` as part of a node's `Status`, which is the address that that node connects to the manager from.
* The `HostConfig` field now includes `NanoCPUs` that represents CPU quota in units of 10<sup>-9</sup> CPUs.
* `GET /info` now returns more structured information about security options.
* The `HostConfig` field now includes `CpuCount` that represents the number of CPUs available for execution by the container. Windows daemon only.
* `POST /services/create` and `POST /services/(id or name)/update` now accept the `TTY` parameter, which allocate a pseudo-TTY in container.
* `POST /services/create` and `POST /services/(id or name)/update` now accept the `DNSConfig` parameter, which specifies DNS related configurations in resolver configuration file (resolv.conf) through `Nameservers`, `Search`, and `Options`.
* `GET /networks/(id or name)` now includes IP and name of all peers nodes for swarm mode overlay networks.
* `GET /plugins` list plugins.
* `POST /plugins/pull?name=<plugin name>` pulls a plugin.
* `GET /plugins/(plugin name)` inspect a plugin.
* `POST /plugins/(plugin name)/set` configure a plugin.
* `POST /plugins/(plugin name)/enable` enable a plugin.
* `POST /plugins/(plugin name)/disable` disable a plugin.
* `POST /plugins/(plugin name)/push` push a plugin.
* `POST /plugins/create?name=(plugin name)` create a plugin.
* `DELETE /plugins/(plugin name)` delete a plugin.
* `POST /node/(id or name)/update` now accepts both `id` or `name` to identify the node to update.
* `GET /images/json` now support a `reference` filter.
* `GET /secrets` returns information on the secrets.
* `POST /secrets/create` creates a secret.
* `DELETE /secrets/{id}` removes the secret `id`.
* `GET /secrets/{id}` returns information on the secret `id`.
* `POST /secrets/{id}/update` updates the secret `id`.

## v1.24 API changes

[Docker Engine API v1.24](v1.24.md) documentation

* `POST /containers/create` now takes `StorageOpt` field.
* `GET /info` now returns `SecurityOptions` field, showing if `apparmor`, `seccomp`, or `selinux` is supported.
* `GET /info` no longer returns the `ExecutionDriver` property. This property was no longer used after integration
  with ContainerD in Docker 1.11.
* `GET /networks` now supports filtering by `label` and `driver`.
* `GET /containers/json` now supports filtering containers by `network` name or id.
* `POST /containers/create` now takes `IOMaximumBandwidth` and `IOMaximumIOps` fields. Windows daemon only.
* `POST /containers/create` now returns an HTTP 400 "bad parameter" message
  if no command is specified (instead of an HTTP 500 "server error")
* `GET /images/search` now takes a `filters` query parameter.
* `GET /events` now supports a `reload` event that is emitted when the daemon configuration is reloaded.
* `GET /events` now supports filtering by daemon name or ID.
* `GET /events` now supports a `detach` event that is emitted on detaching from container process.
* `GET /events` now supports an `exec_detach ` event that is emitted on detaching from exec process.
* `GET /images/json` now supports filters `since` and `before`.
* `POST /containers/(id or name)/start` no longer accepts a `HostConfig`.
* `POST /images/(name)/tag` no longer has a `force` query parameter.
* `GET /images/search` now supports maximum returned search results `limit`.
* `POST /containers/{name:.*}/copy` is now removed and errors out starting from this API version.
* API errors are now returned as JSON instead of plain text.
* `POST /containers/create` and `POST /containers/(id)/start` allow you to configure kernel parameters (sysctls) for use in the container.
* `POST /containers/<container ID>/exec` and `POST /exec/<exec ID>/start`
  no longer expects a "Container" field to be present. This property was not used
  and is no longer sent by the docker client.
* `POST /containers/create/` now validates the hostname (should be a valid RFC 1123 hostname).
* `POST /containers/create/` `HostConfig.PidMode` field now accepts `container:<name|id>`,
  to have the container join the PID namespace of an existing container.

## v1.23 API changes

[Docker Engine API v1.23](v1.23.md) documentation

* `GET /containers/json` returns the state of the container, one of `created`, `restarting`, `running`, `paused`, `exited` or `dead`.
* `GET /containers/json` returns the mount points for the container.
* `GET /networks/(name)` now returns an `Internal` field showing whether the network is internal or not.
* `GET /networks/(name)` now returns an `EnableIPv6` field showing whether the network has ipv6 enabled or not.
* `POST /containers/(name)/update` now supports updating container's restart policy.
* `POST /networks/create` now supports enabling ipv6 on the network by setting the `EnableIPv6` field (doing this with a label will no longer work).
* `GET /info` now returns `CgroupDriver` field showing what cgroup driver the daemon is using; `cgroupfs` or `systemd`.
* `GET /info` now returns `KernelMemory` field, showing if "kernel memory limit" is supported.
* `POST /containers/create` now takes `PidsLimit` field, if the kernel is >= 4.3 and the pids cgroup is supported.
* `GET /containers/(id or name)/stats` now returns `pids_stats`, if the kernel is >= 4.3 and the pids cgroup is supported.
* `POST /containers/create` now allows you to override usernamespaces remapping and use privileged options for the container.
* `POST /containers/create` now allows specifying `nocopy` for named volumes, which disables automatic copying from the container path to the volume.
* `POST /auth` now returns an `IdentityToken` when supported by a registry.
* `POST /containers/create` with both `Hostname` and `Domainname` fields specified will result in the container's hostname being set to `Hostname`, rather than `Hostname.Domainname`.
* `GET /volumes` now supports more filters, new added filters are `name` and `driver`.
* `GET /containers/(id or name)/logs` now accepts a `details` query parameter to stream the extra attributes that were provided to the containers `LogOpts`, such as environment variables and labels, with the logs.
* `POST /images/load` now returns progress information as a JSON stream, and has a `quiet` query parameter to suppress progress details.

## v1.22 API changes

[Docker Engine API v1.22](v1.22.md) documentation

* `POST /container/(name)/update` updates the resources of a container.
* `GET /containers/json` supports filter `isolation` on Windows.
* `GET /containers/json` now returns the list of networks of containers.
* `GET /info` Now returns `Architecture` and `OSType` fields, providing information
  about the host architecture and operating system type that the daemon runs on.
* `GET /networks/(name)` now returns a `Name` field for each container attached to the network.
* `GET /version` now returns the `BuildTime` field in RFC3339Nano format to make it
  consistent with other date/time values returned by the API.
* `AuthConfig` now supports a `registrytoken` for token based authentication
* `POST /containers/create` now has a 4M minimum value limit for `HostConfig.KernelMemory`
* Pushes initiated with `POST /images/(name)/push` and pulls initiated with `POST /images/create`
  will be cancelled if the HTTP connection making the API request is closed before
  the push or pull completes.
* `POST /containers/create` now allows you to set a read/write rate limit for a
  device (in bytes per second or IO per second).
* `GET /networks` now supports filtering by `name`, `id` and `type`.
* `POST /containers/create` now allows you to set the static IPv4 and/or IPv6 address for the container.
* `POST /networks/(id)/connect` now allows you to set the static IPv4 and/or IPv6 address for the container.
* `GET /info` now includes the number of containers running, stopped, and paused.
* `POST /networks/create` now supports restricting external access to the network by setting the `Internal` field.
* `POST /networks/(id)/disconnect` now includes a `Force` option to forcefully disconnect a container from network
* `GET /containers/(id)/json` now returns the `NetworkID` of containers.
* `POST /networks/create` Now supports an options field in the IPAM config that provides options
  for custom IPAM plugins.
* `GET /networks/{network-id}` Now returns IPAM config options for custom IPAM plugins if any
  are available.
* `GET /networks/<network-id>` now returns subnets info for user-defined networks.
* `GET /info` can now return a `SystemStatus` field useful for returning additional information about applications
  that are built on top of engine.

## v1.21 API changes

[Docker Engine API v1.21](v1.21.md) documentation

* `GET /volumes` lists volumes from all volume drivers.
* `POST /volumes/create` to create a volume.
* `GET /volumes/(name)` get low-level information about a volume.
* `DELETE /volumes/(name)` remove a volume with the specified name.
* `VolumeDriver` was moved from `config` to `HostConfig` to make the configuration portable.
* `GET /images/(name)/json` now returns information about an image's `RepoTags` and `RepoDigests`.
* The `config` option now accepts the field `StopSignal`, which specifies the signal to use to kill a container.
* `GET /containers/(id)/stats` will return networking information respectively for each interface.
* The `HostConfig` option now includes the `DnsOptions` field to configure the container's DNS options.
* `POST /build` now optionally takes a serialized map of build-time variables.
* `GET /events` now includes a `timenano` field, in addition to the existing `time` field.
* `GET /events` now supports filtering by image and container labels.
* `GET /info` now lists engine version information and return the information of `CPUShares` and `Cpuset`.
* `GET /containers/json` will return `ImageID` of the image used by container.
* `POST /exec/(name)/start` will now return an HTTP 409 when the container is either stopped or paused.
* `POST /containers/create` now takes `KernelMemory` in HostConfig to specify kernel memory limit.
* `GET /containers/(name)/json` now accepts a `size` parameter. Setting this parameter to '1' returns container size information in the `SizeRw` and `SizeRootFs` fields.
* `GET /containers/(name)/json` now returns a `NetworkSettings.Networks` field,
  detailing network settings per network. This field deprecates the
  `NetworkSettings.Gateway`, `NetworkSettings.IPAddress`,
  `NetworkSettings.IPPrefixLen`, and `NetworkSettings.MacAddress` fields, which
  are still returned for backward-compatibility, but will be removed in a future version.
* `GET /exec/(id)/json` now returns a `NetworkSettings.Networks` field,
  detailing networksettings per network. This field deprecates the
  `NetworkSettings.Gateway`, `NetworkSettings.IPAddress`,
  `NetworkSettings.IPPrefixLen`, and `NetworkSettings.MacAddress` fields, which
  are still returned for backward-compatibility, but will be removed in a future version.
* The `HostConfig` option now includes the `OomScoreAdj` field for adjusting the
  badness heuristic. This heuristic selects which processes the OOM killer kills
  under out-of-memory conditions.

## v1.20 API changes

[Docker Engine API v1.20](v1.20.md) documentation

* `GET /containers/(id)/archive` get an archive of filesystem content from a container.
* `PUT /containers/(id)/archive` upload an archive of content to be extracted to
an existing directory inside a container's filesystem.
* `POST /containers/(id)/copy` is deprecated in favor of the above `archive`
endpoint which can be used to download files and directories from a container.
* The `hostConfig` option now accepts the field `GroupAdd`, which specifies a
list of additional groups that the container process will run as.

## v1.19 API changes

[Docker Engine API v1.19](v1.19.md) documentation

* When the daemon detects a version mismatch with the client, usually when
the client is newer than the daemon, an HTTP 400 is now returned instead
of a 404.
* `GET /containers/(id)/stats` now accepts `stream` bool to get only one set of stats and disconnect.
* `GET /containers/(id)/logs` now accepts a `since` timestamp parameter.
* `GET /info` The fields `Debug`, `IPv4Forwarding`, `MemoryLimit`, and
`SwapLimit` are now returned as boolean instead of as an int. In addition, the
end point now returns the new boolean fields `CpuCfsPeriod`, `CpuCfsQuota`, and
`OomKillDisable`.
* The `hostConfig` option now accepts the fields `CpuPeriod` and `CpuQuota`
* `POST /build` accepts `cpuperiod` and `cpuquota` options

## v1.18 API changes

[Docker Engine API v1.18](v1.18.md) documentation

* `GET /version` now returns `Os`, `Arch` and `KernelVersion`.
* `POST /containers/create` and `POST /containers/(id)/start`allow you to  set ulimit settings for use in the container.
* `GET /info` now returns `SystemTime`, `HttpProxy`,`HttpsProxy` and `NoProxy`.
* `GET /images/json` added a `RepoDigests` field to include image digest information.
* `POST /build` can now set resource constraints for all containers created for the build.
* `CgroupParent` can be passed in the host config to setup container cgroups under a specific cgroup.
* `POST /build` closing the HTTP request cancels the build
* `POST /containers/(id)/exec` includes `Warnings` field to response.
