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# A Swagger 2.0 (a.k.a. OpenAPI) definition of the Engine API.
#
# This is used for generating API documentation and the types used by the
# client/server. See api/README.md for more information.
#
# Some style notes:
# - This file is used by ReDoc, which allows GitHub Flavored Markdown in
# descriptions.
# - There is no maximum line length, for ease of editing and pretty diffs.
# - operationIds are in the format "NounVerb", with a singular noun.
swagger: "2.0"
schemes:
- "http"
- "https"
produces:
- "application/json"
- "text/plain"
consumes:
- "application/json"
- "text/plain"
basePath: "/v1.40"
info:
title: "Docker Engine API"
version: "1.40"
x-logo:
url: "https://docs.docker.com/images/logo-docker-main.png"
description: |
The Engine API is an HTTP API served by Docker Engine. It is the API the
Docker client uses to communicate with the Engine, so everything the Docker
client can do can be done with the API.
Most of the client's commands map directly to API endpoints (e.g. `docker ps`
is `GET /containers/json`). The notable exception is running containers,
which consists of several API calls.
# Errors
The API uses standard HTTP status codes to indicate the success or failure
of the API call. The body of the response will be JSON in the following
format:
```
{
"message": "page not found"
}
```
# Versioning
The API is usually changed in each release, so API calls are versioned to
ensure that clients don't break. To lock to a specific version of the API,
you prefix the URL with its version, for example, call `/v1.30/info` to use
the v1.30 version of the `/info` endpoint. If the API version specified in
the URL is not supported by the daemon, a HTTP `400 Bad Request` error message
is returned.
If you omit the version-prefix, the current version of the API (v1.40) is used.
For example, calling `/info` is the same as calling `/v1.40/info`. Using the
API without a version-prefix is deprecated and will be removed in a future release.
Engine releases in the near future should support this version of the API,
so your client will continue to work even if it is talking to a newer Engine.
The API uses an open schema model, which means server may add extra properties
to responses. Likewise, the server will ignore any extra query parameters and
request body properties. When you write clients, you need to ignore additional
properties in responses to ensure they do not break when talking to newer
daemons.
# Authentication
Authentication for registries is handled client side. The client has to send
authentication details to various endpoints that need to communicate with
registries, such as `POST /images/(name)/push`. These are sent as
`X-Registry-Auth` header as a [base64url encoded](https://tools.ietf.org/html/rfc4648#section-5)
(JSON) string with the following structure:
```
{
"username": "string",
"password": "string",
"email": "string",
"serveraddress": "string"
}
```
The `serveraddress` is a domain/IP without a protocol. Throughout this
structure, double quotes are required.
If you have already got an identity token from the [`/auth` endpoint](#operation/SystemAuth),
you can just pass this instead of credentials:
```
{
"identitytoken": "9cbaf023786cd7..."
}
```
# The tags on paths define the menu sections in the ReDoc documentation, so
# the usage of tags must make sense for that:
# - They should be singular, not plural.
# - There should not be too many tags, or the menu becomes unwieldy. For
# example, it is preferable to add a path to the "System" tag instead of
# creating a tag with a single path in it.
# - The order of tags in this list defines the order in the menu.
tags:
# Primary objects
- name: "Container"
x-displayName: "Containers"
description: |
Create and manage containers.
- name: "Image"
x-displayName: "Images"
- name: "Network"
x-displayName: "Networks"
description: |
Networks are user-defined networks that containers can be attached to.
See the [networking documentation](https://docs.docker.com/network/)
for more information.
- name: "Volume"
x-displayName: "Volumes"
description: |
Create and manage persistent storage that can be attached to containers.
- name: "Exec"
x-displayName: "Exec"
description: |
Run new commands inside running containers. Refer to the
[command-line reference](https://docs.docker.com/engine/reference/commandline/exec/)
for more information.
To exec a command in a container, you first need to create an exec instance,
then start it. These two API endpoints are wrapped up in a single command-line
command, `docker exec`.
# Swarm things
- name: "Swarm"
x-displayName: "Swarm"
description: |
Engines can be clustered together in a swarm. Refer to the
[swarm mode documentation](https://docs.docker.com/engine/swarm/)
for more information.
- name: "Node"
x-displayName: "Nodes"
description: |
Nodes are instances of the Engine participating in a swarm. Swarm mode
must be enabled for these endpoints to work.
- name: "Service"
x-displayName: "Services"
description: |
Services are the definitions of tasks to run on a swarm. Swarm mode must
be enabled for these endpoints to work.
- name: "Task"
x-displayName: "Tasks"
description: |
A task is a container running on a swarm. It is the atomic scheduling unit
of swarm. Swarm mode must be enabled for these endpoints to work.
- name: "Secret"
x-displayName: "Secrets"
description: |
Secrets are sensitive data that can be used by services. Swarm mode must
be enabled for these endpoints to work.
- name: "Config"
x-displayName: "Configs"
description: |
Configs are application configurations that can be used by services. Swarm
mode must be enabled for these endpoints to work.
# System things
- name: "Plugin"
x-displayName: "Plugins"
- name: "System"
x-displayName: "System"
definitions:
Port:
type: "object"
description: "An open port on a container"
required: [PrivatePort, Type]
properties:
IP:
type: "string"
format: "ip-address"
description: "Host IP address that the container's port is mapped to"
PrivatePort:
type: "integer"
format: "uint16"
x-nullable: false
description: "Port on the container"
PublicPort:
type: "integer"
format: "uint16"
description: "Port exposed on the host"
Type:
type: "string"
x-nullable: false
enum: ["tcp", "udp", "sctp"]
example:
PrivatePort: 8080
PublicPort: 80
Type: "tcp"
MountPoint:
type: "object"
description: |
MountPoint represents a mount point configuration inside the container.
This is used for reporting the mountpoints in use by a container.
properties:
Type:
description: |
The mount type:
- `bind` a mount of a file or directory from the host into the container.
- `volume` a docker volume with the given `Name`.
- `tmpfs` a `tmpfs`.
- `npipe` a named pipe from the host into the container.
type: "string"
enum:
- "bind"
- "volume"
- "tmpfs"
- "npipe"
example: "volume"
Name:
description: |
Name is the name reference to the underlying data defined by `Source`
e.g., the volume name.
type: "string"
example: "myvolume"
Source:
description: |
Source location of the mount.
For volumes, this contains the storage location of the volume (within
`/var/lib/docker/volumes/`). For bind-mounts, and `npipe`, this contains
the source (host) part of the bind-mount. For `tmpfs` mount points, this
field is empty.
type: "string"
example: "/var/lib/docker/volumes/myvolume/_data"
Destination:
description: |
Destination is the path relative to the container root (`/`) where
the `Source` is mounted inside the container.
type: "string"
example: "/usr/share/nginx/html/"
Driver:
description: |
Driver is the volume driver used to create the volume (if it is a volume).
type: "string"
example: "local"
Mode:
description: |
Mode is a comma separated list of options supplied by the user when
creating the bind/volume mount.
The default is platform-specific (`"z"` on Linux, empty on Windows).
type: "string"
example: "z"
RW:
description: |
Whether the mount is mounted writable (read-write).
type: "boolean"
example: true
Propagation:
description: |
Propagation describes how mounts are propagated from the host into the
mount point, and vice-versa. Refer to the [Linux kernel documentation](https://www.kernel.org/doc/Documentation/filesystems/sharedsubtree.txt)
for details. This field is not used on Windows.
type: "string"
example: ""
DeviceMapping:
type: "object"
description: "A device mapping between the host and container"
properties:
PathOnHost:
type: "string"
PathInContainer:
type: "string"
CgroupPermissions:
type: "string"
example:
PathOnHost: "/dev/deviceName"
PathInContainer: "/dev/deviceName"
CgroupPermissions: "mrw"
DeviceRequest:
type: "object"
description: "A request for devices to be sent to device drivers"
properties:
Driver:
type: "string"
example: "nvidia"
Count:
type: "integer"
example: -1
DeviceIDs:
type: "array"
items:
type: "string"
example:
- "0"
- "1"
- "GPU-fef8089b-4820-abfc-e83e-94318197576e"
Capabilities:
description: |
A list of capabilities; an OR list of AND lists of capabilities.
type: "array"
items:
type: "array"
items:
type: "string"
example:
# gpu AND nvidia AND compute
- ["gpu", "nvidia", "compute"]
Options:
description: |
Driver-specific options, specified as a key/value pairs. These options
are passed directly to the driver.
type: "object"
additionalProperties:
type: "string"
ThrottleDevice:
type: "object"
properties:
Path:
description: "Device path"
type: "string"
Rate:
description: "Rate"
type: "integer"
format: "int64"
minimum: 0
Mount:
type: "object"
properties:
Target:
description: "Container path."
type: "string"
Source:
description: "Mount source (e.g. a volume name, a host path)."
type: "string"
Type:
description: |
The mount type. Available types:
- `bind` Mounts a file or directory from the host into the container. Must exist prior to creating the container.
- `volume` Creates a volume with the given name and options (or uses a pre-existing volume with the same name and options). These are **not** removed when the container is removed.
- `tmpfs` Create a tmpfs with the given options. The mount source cannot be specified for tmpfs.
- `npipe` Mounts a named pipe from the host into the container. Must exist prior to creating the container.
type: "string"
enum:
- "bind"
- "volume"
- "tmpfs"
- "npipe"
ReadOnly:
description: "Whether the mount should be read-only."
type: "boolean"
Consistency:
description: "The consistency requirement for the mount: `default`, `consistent`, `cached`, or `delegated`."
type: "string"
BindOptions:
description: "Optional configuration for the `bind` type."
type: "object"
properties:
Propagation:
description: "A propagation mode with the value `[r]private`, `[r]shared`, or `[r]slave`."
type: "string"
enum:
- "private"
- "rprivate"
- "shared"
- "rshared"
- "slave"
- "rslave"
NonRecursive:
description: "Disable recursive bind mount."
type: "boolean"
default: false
VolumeOptions:
description: "Optional configuration for the `volume` type."
type: "object"
properties:
NoCopy:
description: "Populate volume with data from the target."
type: "boolean"
default: false
Labels:
description: "User-defined key/value metadata."
type: "object"
additionalProperties:
type: "string"
DriverConfig:
description: "Map of driver specific options"
type: "object"
properties:
Name:
description: "Name of the driver to use to create the volume."
type: "string"
Options:
description: "key/value map of driver specific options."
type: "object"
additionalProperties:
type: "string"
TmpfsOptions:
description: "Optional configuration for the `tmpfs` type."
type: "object"
properties:
SizeBytes:
description: "The size for the tmpfs mount in bytes."
type: "integer"
format: "int64"
Mode:
description: "The permission mode for the tmpfs mount in an integer."
type: "integer"
RestartPolicy:
description: |
The behavior to apply when the container exits. The default is not to
restart.
An ever increasing delay (double the previous delay, starting at 100ms) is
added before each restart to prevent flooding the server.
type: "object"
properties:
Name:
type: "string"
description: |
- Empty string means not to restart
- `no` Do not automatically restart
- `always` Always restart
- `unless-stopped` Restart always except when the user has manually stopped the container
- `on-failure` Restart only when the container exit code is non-zero
enum:
- ""
- "no"
- "always"
- "unless-stopped"
- "on-failure"
MaximumRetryCount:
type: "integer"
description: |
If `on-failure` is used, the number of times to retry before giving up.
Resources:
description: "A container's resources (cgroups config, ulimits, etc)"
type: "object"
properties:
# Applicable to all platforms
CpuShares:
description: |
An integer value representing this container's relative CPU weight
versus other containers.
type: "integer"
Memory:
description: "Memory limit in bytes."
type: "integer"
format: "int64"
default: 0
# Applicable to UNIX platforms
CgroupParent:
description: |
Path to `cgroups` under which the container's `cgroup` is created. If
the path is not absolute, the path is considered to be relative to the
`cgroups` path of the init process. Cgroups are created if they do not
already exist.
type: "string"
BlkioWeight:
description: "Block IO weight (relative weight)."
type: "integer"
minimum: 0
maximum: 1000
BlkioWeightDevice:
description: |
Block IO weight (relative device weight) in the form:
```
[{"Path": "device_path", "Weight": weight}]
```
type: "array"
items:
type: "object"
properties:
Path:
type: "string"
Weight:
type: "integer"
minimum: 0
BlkioDeviceReadBps:
description: |
Limit read rate (bytes per second) from a device, in the form:
```
[{"Path": "device_path", "Rate": rate}]
```
type: "array"
items:
$ref: "#/definitions/ThrottleDevice"
BlkioDeviceWriteBps:
description: |
Limit write rate (bytes per second) to a device, in the form:
```
[{"Path": "device_path", "Rate": rate}]
```
type: "array"
items:
$ref: "#/definitions/ThrottleDevice"
BlkioDeviceReadIOps:
description: |
Limit read rate (IO per second) from a device, in the form:
```
[{"Path": "device_path", "Rate": rate}]
```
type: "array"
items:
$ref: "#/definitions/ThrottleDevice"
BlkioDeviceWriteIOps:
description: |
Limit write rate (IO per second) to a device, in the form:
```
[{"Path": "device_path", "Rate": rate}]
```
type: "array"
items:
$ref: "#/definitions/ThrottleDevice"
CpuPeriod:
description: "The length of a CPU period in microseconds."
type: "integer"
format: "int64"
CpuQuota:
description: |
Microseconds of CPU time that the container can get in a CPU period.
type: "integer"
format: "int64"
CpuRealtimePeriod:
description: |
The length of a CPU real-time period in microseconds. Set to 0 to
allocate no time allocated to real-time tasks.
type: "integer"
format: "int64"
CpuRealtimeRuntime:
description: |
The length of a CPU real-time runtime in microseconds. Set to 0 to
allocate no time allocated to real-time tasks.
type: "integer"
format: "int64"
CpusetCpus:
description: |
CPUs in which to allow execution (e.g., `0-3`, `0,1`).
type: "string"
example: "0-3"
CpusetMems:
description: |
Memory nodes (MEMs) in which to allow execution (0-3, 0,1). Only
effective on NUMA systems.
type: "string"
Devices:
description: "A list of devices to add to the container."
type: "array"
items:
$ref: "#/definitions/DeviceMapping"
DeviceCgroupRules:
description: "a list of cgroup rules to apply to the container"
type: "array"
items:
type: "string"
example: "c 13:* rwm"
DeviceRequests:
description: |
A list of requests for devices to be sent to device drivers.
type: "array"
items:
$ref: "#/definitions/DeviceRequest"
KernelMemory:
description: "Kernel memory limit in bytes."
type: "integer"
format: "int64"
example: 209715200
KernelMemoryTCP:
description: "Hard limit for kernel TCP buffer memory (in bytes)."
type: "integer"
format: "int64"
MemoryReservation:
description: "Memory soft limit in bytes."
type: "integer"
format: "int64"
MemorySwap:
description: |
Total memory limit (memory + swap). Set as `-1` to enable unlimited
swap.
type: "integer"
format: "int64"
MemorySwappiness:
description: |
Tune a container's memory swappiness behavior. Accepts an integer
between 0 and 100.
type: "integer"
format: "int64"
minimum: 0
maximum: 100
NanoCpus:
description: "CPU quota in units of 10<sup>-9</sup> CPUs."
type: "integer"
format: "int64"
OomKillDisable:
description: "Disable OOM Killer for the container."
type: "boolean"
Init:
description: |
Run an init inside the container that forwards signals and reaps
processes. This field is omitted if empty, and the default (as
configured on the daemon) is used.
type: "boolean"
x-nullable: true
PidsLimit:
description: |
Tune a container's PIDs limit. Set `0` or `-1` for unlimited, or `null`
to not change.
type: "integer"
format: "int64"
x-nullable: true
Ulimits:
description: |
A list of resource limits to set in the container. For example:
```
{"Name": "nofile", "Soft": 1024, "Hard": 2048}
```
type: "array"
items:
type: "object"
properties:
Name:
description: "Name of ulimit"
type: "string"
Soft:
description: "Soft limit"
type: "integer"
Hard:
description: "Hard limit"
type: "integer"
# Applicable to Windows
CpuCount:
description: |
The number of usable CPUs (Windows only).
On Windows Server containers, the processor resource controls are
mutually exclusive. The order of precedence is `CPUCount` first, then
`CPUShares`, and `CPUPercent` last.
type: "integer"
format: "int64"
CpuPercent:
description: |
The usable percentage of the available CPUs (Windows only).
On Windows Server containers, the processor resource controls are
mutually exclusive. The order of precedence is `CPUCount` first, then
`CPUShares`, and `CPUPercent` last.
type: "integer"
format: "int64"
IOMaximumIOps:
description: "Maximum IOps for the container system drive (Windows only)"
type: "integer"
format: "int64"
IOMaximumBandwidth:
description: |
Maximum IO in bytes per second for the container system drive
(Windows only).
type: "integer"
format: "int64"
ResourceObject:
description: |
An object describing the resources which can be advertised by a node and
requested by a task.
type: "object"
properties:
NanoCPUs:
type: "integer"
format: "int64"
example: 4000000000
MemoryBytes:
type: "integer"
format: "int64"
example: 8272408576
GenericResources:
$ref: "#/definitions/GenericResources"
GenericResources:
description: |
User-defined resources can be either Integer resources (e.g, `SSD=3`) or
String resources (e.g, `GPU=UUID1`).
type: "array"
items:
type: "object"
properties:
NamedResourceSpec:
type: "object"
properties:
Kind:
type: "string"
Value:
type: "string"
DiscreteResourceSpec:
type: "object"
properties:
Kind:
type: "string"
Value:
type: "integer"
format: "int64"
example:
- DiscreteResourceSpec:
Kind: "SSD"
Value: 3
- NamedResourceSpec:
Kind: "GPU"
Value: "UUID1"
- NamedResourceSpec:
Kind: "GPU"
Value: "UUID2"
HealthConfig:
description: "A test to perform to check that the container is healthy."
type: "object"
properties:
Test:
description: |
The test to perform. Possible values are:
- `[]` inherit healthcheck from image or parent image
- `["NONE"]` disable healthcheck
- `["CMD", args...]` exec arguments directly
- `["CMD-SHELL", command]` run command with system's default shell
type: "array"
items:
type: "string"
Interval:
description: |
The time to wait between checks in nanoseconds. It should be 0 or at
least 1000000 (1 ms). 0 means inherit.
type: "integer"
Timeout:
description: |
The time to wait before considering the check to have hung. It should
be 0 or at least 1000000 (1 ms). 0 means inherit.
type: "integer"
Retries:
description: |
The number of consecutive failures needed to consider a container as
unhealthy. 0 means inherit.
type: "integer"
StartPeriod:
description: |
Start period for the container to initialize before starting
health-retries countdown in nanoseconds. It should be 0 or at least
1000000 (1 ms). 0 means inherit.
type: "integer"
Health:
description: |
Health stores information about the container's healthcheck results.
type: "object"
properties:
Status:
description: |
Status is one of `none`, `starting`, `healthy` or `unhealthy`
- "none" Indicates there is no healthcheck
- "starting" Starting indicates that the container is not yet ready
- "healthy" Healthy indicates that the container is running correctly
- "unhealthy" Unhealthy indicates that the container has a problem
type: "string"
enum:
- "none"
- "starting"
- "healthy"
- "unhealthy"
example: "healthy"
FailingStreak:
description: "FailingStreak is the number of consecutive failures"
type: "integer"
example: 0
Log:
type: "array"
description: |
Log contains the last few results (oldest first)
items:
x-nullable: true
$ref: "#/definitions/HealthcheckResult"
HealthcheckResult:
description: |
HealthcheckResult stores information about a single run of a healthcheck probe
type: "object"
properties:
Start:
description: |
Date and time at which this check started in
[RFC 3339](https://www.ietf.org/rfc/rfc3339.txt) format with nano-seconds.
type: "string"
format: "date-time"
example: "2020-01-04T10:44:24.496525531Z"
End:
description: |
Date and time at which this check ended in
[RFC 3339](https://www.ietf.org/rfc/rfc3339.txt) format with nano-seconds.
type: "string"
format: "dateTime"
example: "2020-01-04T10:45:21.364524523Z"
ExitCode:
description: |
ExitCode meanings:
- `0` healthy
- `1` unhealthy
- `2` reserved (considered unhealthy)
- other values: error running probe
type: "integer"
example: 0
Output:
description: "Output from last check"
type: "string"
HostConfig:
description: "Container configuration that depends on the host we are running on"
allOf:
- $ref: "#/definitions/Resources"
- type: "object"
properties:
# Applicable to all platforms
Binds:
type: "array"
description: |
A list of volume bindings for this container. Each volume binding
is a string in one of these forms:
- `host-src:container-dest[:options]` to bind-mount a host path
into the container. Both `host-src`, and `container-dest` must
be an _absolute_ path.
- `volume-name:container-dest[:options]` to bind-mount a volume
managed by a volume driver into the container. `container-dest`
must be an _absolute_ path.
`options` is an optional, comma-delimited list of:
- `nocopy` disables automatic copying of data from the container
path to the volume. The `nocopy` flag only applies to named volumes.
- `[ro|rw]` mounts a volume read-only or read-write, respectively.
If omitted or set to `rw`, volumes are mounted read-write.
- `[z|Z]` applies SELinux labels to allow or deny multiple containers
to read and write to the same volume.
- `z`: a _shared_ content label is applied to the content. This
label indicates that multiple containers can share the volume
content, for both reading and writing.
- `Z`: a _private unshared_ label is applied to the content.
This label indicates that only the current container can use
a private volume. Labeling systems such as SELinux require
proper labels to be placed on volume content that is mounted
into a container. Without a label, the security system can
prevent a container's processes from using the content. By
default, the labels set by the host operating system are not
modified.
- `[[r]shared|[r]slave|[r]private]` specifies mount
[propagation behavior](https://www.kernel.org/doc/Documentation/filesystems/sharedsubtree.txt).
This only applies to bind-mounted volumes, not internal volumes
or named volumes. Mount propagation requires the source mount
point (the location where the source directory is mounted in the
host operating system) to have the correct propagation properties.
For shared volumes, the source mount point must be set to `shared`.
For slave volumes, the mount must be set to either `shared` or
`slave`.
items:
type: "string"
ContainerIDFile:
type: "string"
description: "Path to a file where the container ID is written"
LogConfig:
type: "object"
description: "The logging configuration for this container"
properties:
Type:
type: "string"
enum:
- "json-file"
- "syslog"
- "journald"
- "gelf"
- "fluentd"
- "awslogs"
- "splunk"
- "etwlogs"
- "none"
Config:
type: "object"
additionalProperties:
type: "string"
NetworkMode:
type: "string"
description: |
Network mode to use for this container. Supported standard values
are: `bridge`, `host`, `none`, and `container:<name|id>`. Any
other value is taken as a custom network's name to which this
container should connect to.
PortBindings:
$ref: "#/definitions/PortMap"
RestartPolicy:
$ref: "#/definitions/RestartPolicy"
AutoRemove:
type: "boolean"
description: |
Automatically remove the container when the container's process
exits. This has no effect if `RestartPolicy` is set.
VolumeDriver:
type: "string"
description: "Driver that this container uses to mount volumes."
VolumesFrom:
type: "array"
description: |
A list of volumes to inherit from another container, specified in
the form `<container name>[:<ro|rw>]`.
items:
type: "string"
Mounts:
description: |
Specification for mounts to be added to the container.
type: "array"
items:
$ref: "#/definitions/Mount"
# Applicable to UNIX platforms
Capabilities:
type: "array"
description: |
A list of kernel capabilities to be available for container (this
overrides the default set).
Conflicts with options 'CapAdd' and 'CapDrop'"
items:
type: "string"
CapAdd:
type: "array"
description: |
A list of kernel capabilities to add to the container. Conflicts
with option 'Capabilities'.
items:
type: "string"
CapDrop:
type: "array"
description: |
A list of kernel capabilities to drop from the container. Conflicts
with option 'Capabilities'.
items:
type: "string"
Dns:
type: "array"
description: "A list of DNS servers for the container to use."
items:
type: "string"
DnsOptions:
type: "array"
description: "A list of DNS options."
items:
type: "string"
DnsSearch:
type: "array"
description: "A list of DNS search domains."
items:
type: "string"
ExtraHosts:
type: "array"
description: |
A list of hostnames/IP mappings to add to the container's `/etc/hosts`
file. Specified in the form `["hostname:IP"]`.
items:
type: "string"
GroupAdd:
type: "array"
description: |
A list of additional groups that the container process will run as.
items:
type: "string"
IpcMode:
type: "string"
description: |
IPC sharing mode for the container. Possible values are:
- `"none"`: own private IPC namespace, with /dev/shm not mounted
- `"private"`: own private IPC namespace
- `"shareable"`: own private IPC namespace, with a possibility to share it with other containers
- `"container:<name|id>"`: join another (shareable) container's IPC namespace
- `"host"`: use the host system's IPC namespace
If not specified, daemon default is used, which can either be `"private"`