Docker

Since Camel 2.15

Both producer and consumer are supported

Camel component for communicating with Docker.

The Docker Camel component leverages the docker-java via the Docker Remote API.

URI format

docker://[operation]?[options]

Where operation is the specific action to perform on Docker.

Configuring Options

Camel components are configured on two separate levels:

  • component level

  • endpoint level

Configuring Component Options

The component level is the highest level which holds general and common configurations that are inherited by the endpoints. For example a component may have security settings, credentials for authentication, urls for network connection and so forth.

Some components only have a few options, and others may have many. Because components typically have pre configured defaults that are commonly used, then you may often only need to configure a few options on a component; or none at all.

Configuring components can be done with the Component DSL, in a configuration file (application.properties|yaml), or directly with Java code.

Configuring Endpoint Options

Where you find yourself configuring the most is on endpoints, as endpoints often have many options, which allows you to configure what you need the endpoint to do. The options are also categorized into whether the endpoint is used as consumer (from) or as a producer (to), or used for both.

Configuring endpoints is most often done directly in the endpoint URI as path and query parameters. You can also use the Endpoint DSL as a type safe way of configuring endpoints.

A good practice when configuring options is to use Property Placeholders, which allows to not hardcode urls, port numbers, sensitive information, and other settings. In other words placeholders allows to externalize the configuration from your code, and gives more flexibility and reuse.

The following two sections lists all the options, firstly for the component followed by the endpoint.

Component Options

The Docker component supports 21 options, which are listed below.

Name Description Default Type

configuration (common)

To use the shared docker configuration.

DockerConfiguration

email (common)

Email address associated with the user.

String

host (common)

Required Docker host.

String

port (common)

Docker port.

Integer

requestTimeout (common)

Request timeout for response (in seconds).

Integer

bridgeErrorHandler (consumer)

Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored.

boolean

lazyStartProducer (producer)

Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.

boolean

autowiredEnabled (advanced)

Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc.

boolean

cmdExecFactory (advanced)

The fully qualified class name of the DockerCmdExecFactory implementation to use.

String

followRedirectFilter (advanced)

Whether to follow redirect filter.

boolean

loggingFilter (advanced)

Whether to use logging filter.

boolean

maxPerRouteConnections (advanced)

Maximum route connections.

Integer

maxTotalConnections (advanced)

Maximum total connections.

Integer

parameters (advanced)

Additional configuration parameters as key/value pairs.

Map

serverAddress (advanced)

Server address for docker registry.

String

socket (advanced)

Socket connection mode.

boolean

certPath (security)

Location containing the SSL certificate chain.

String

password (security)

Password to authenticate with.

String

secure (security)

Use HTTPS communication.

boolean

tlsVerify (security)

Check TLS.

boolean

username (security)

User name to authenticate with.

String

Endpoint Options

The Docker endpoint is configured using URI syntax:

docker:operation

with the following path and query parameters:

Path Parameters (1 parameters)

Name Description Default Type

operation (common)

Required Which operation to use.

Enum values:

  • events

  • stats

  • auth

  • info

  • ping

  • version

  • imagebuild

  • imagecreate

  • imageinspect

  • imagelist

  • imagepull

  • imagepushimageremove

  • imagesearch

  • imagetag

  • containerattach

  • containercommit

  • containercopyfile

  • containercreate

  • containerdiffinspectcontainer

  • containerkill

  • containerlist

  • containerlog

  • containerpause

  • containerrestart

  • containerremove

  • containerstartcontainerstop

  • containertop

  • containerunpause

  • containerwait

  • execcreate

  • execstart

DockerOperation

Query Parameters (21 parameters)

Name Description Default Type

email (common)

Email address associated with the user.

String

host (common)

Required Docker host.

String

port (common)

Docker port.

Integer

requestTimeout (common)

Request timeout for response (in seconds).

Integer

bridgeErrorHandler (consumer)

Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored.

boolean

exceptionHandler (consumer (advanced))

To let the consumer use a custom ExceptionHandler. Notice if the option bridgeErrorHandler is enabled then this option is not in use. By default the consumer will deal with exceptions, that will be logged at WARN or ERROR level and ignored.

ExceptionHandler

exchangePattern (consumer (advanced))

Sets the exchange pattern when the consumer creates an exchange.

Enum values:

  • InOnly

  • InOut

  • InOptionalOut

ExchangePattern

lazyStartProducer (producer)

Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.

boolean

cmdExecFactory (advanced)

The fully qualified class name of the DockerCmdExecFactory implementation to use.

String

followRedirectFilter (advanced)

Whether to follow redirect filter.

boolean

loggingFilter (advanced)

Whether to use logging filter.

boolean

maxPerRouteConnections (advanced)

Maximum route connections.

Integer

maxTotalConnections (advanced)

Maximum total connections.

Integer

parameters (advanced)

Additional configuration parameters as key/value pairs.

Map

serverAddress (advanced)

Server address for docker registry.

String

socket (advanced)

Socket connection mode.

boolean

certPath (security)

Location containing the SSL certificate chain.

String

password (security)

Password to authenticate with.

String

secure (security)

Use HTTPS communication.

boolean

tlsVerify (security)

Check TLS.

boolean

username (security)

User name to authenticate with.

String

Header Strategy

All URI option can be passed as Header properties. Values found in a message header take precedence over URI parameters. A header property takes the form of a URI option prefixed with CamelDocker as shown below

URI Option Header Property

containerId

CamelDockerContainerId

Examples

The following example consumes events from Docker:

from("docker://events?host=192.168.59.103&port=2375").to("log:event");

The following example queries Docker for system wide information

from("docker://info?host=192.168.59.103&port=2375").to("log:info");

Dependencies

To use Docker in your Camel routes you need to add a dependency on camel-docker, which implements the component.

If you use Maven you can just add the following to your pom.xml, substituting the version number for the latest and greatest release (see the download page for the latest versions).

<dependency>
  <groupId>org.apache.camel</groupId>
  <artifactId>camel-docker</artifactId>
  <version>x.x.x</version>
</dependency>

Spring Boot Auto-Configuration

When using docker with Spring Boot make sure to use the following Maven dependency to have support for auto configuration:

<dependency>
  <groupId>org.apache.camel.springboot</groupId>
  <artifactId>camel-docker-starter</artifactId>
  <version>x.x.x</version>
  <!-- use the same version as your Camel core version -->
</dependency>

The component supports 22 options, which are listed below.

Name Description Default Type

camel.component.docker.autowired-enabled

Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc.

true

Boolean

camel.component.docker.bridge-error-handler

Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored.

false

Boolean

camel.component.docker.cert-path

Location containing the SSL certificate chain.

String

camel.component.docker.cmd-exec-factory

The fully qualified class name of the DockerCmdExecFactory implementation to use.

com.github.dockerjava.netty.NettyDockerCmdExecFactory

String

camel.component.docker.configuration

To use the shared docker configuration. The option is a org.apache.camel.component.docker.DockerConfiguration type.

DockerConfiguration

camel.component.docker.email

Email address associated with the user.

String

camel.component.docker.enabled

Whether to enable auto configuration of the docker component. This is enabled by default.

Boolean

camel.component.docker.follow-redirect-filter

Whether to follow redirect filter.

false

Boolean

camel.component.docker.host

Docker host.

localhost

String

camel.component.docker.lazy-start-producer

Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.

false

Boolean

camel.component.docker.logging-filter

Whether to use logging filter.

false

Boolean

camel.component.docker.max-per-route-connections

Maximum route connections.

100

Integer

camel.component.docker.max-total-connections

Maximum total connections.

100

Integer

camel.component.docker.parameters

Additional configuration parameters as key/value pairs.

Map

camel.component.docker.password

Password to authenticate with.

String

camel.component.docker.port

Docker port.

2375

Integer

camel.component.docker.request-timeout

Request timeout for response (in seconds).

Integer

camel.component.docker.secure

Use HTTPS communication.

false

Boolean

camel.component.docker.server-address

Server address for docker registry.

https://index.docker.io/v1/

String

camel.component.docker.socket

Socket connection mode.

true

Boolean

camel.component.docker.tls-verify

Check TLS.

false

Boolean

camel.component.docker.username

User name to authenticate with.

String