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 |
---|---|---|---|
To use the shared docker configuration. |
DockerConfiguration |
||
Email address associated with the user. |
String |
||
Required Docker host. |
localhost |
String |
|
Docker port. |
2375 |
Integer |
|
Request timeout for response (in seconds). |
Integer |
||
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 |
|
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 |
|
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 |
|
The fully qualified class name of the DockerCmdExecFactory implementation to use. |
com.github.dockerjava.netty.NettyDockerCmdExecFactory |
String |
|
Whether to follow redirect filter. |
false |
boolean |
|
Whether to use logging filter. |
false |
boolean |
|
Maximum route connections. |
100 |
Integer |
|
Maximum total connections. |
100 |
Integer |
|
Additional configuration parameters as key/value pairs. |
Map |
||
Server address for docker registry. |
String |
||
Socket connection mode. |
true |
boolean |
|
Location containing the SSL certificate chain. |
String |
||
Password to authenticate with. |
String |
||
Use HTTPS communication. |
false |
boolean |
|
Check TLS. |
false |
boolean |
|
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 |
---|---|---|---|
Required Which operation to use. Enum values:
|
DockerOperation |
Query Parameters (21 parameters)
Name | Description | Default | Type |
---|---|---|---|
Email address associated with the user. |
String |
||
Required Docker host. |
localhost |
String |
|
Docker port. |
2375 |
Integer |
|
Request timeout for response (in seconds). |
Integer |
||
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 |
|
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 |
||
Sets the exchange pattern when the consumer creates an exchange. Enum values:
|
ExchangePattern |
||
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 |
|
The fully qualified class name of the DockerCmdExecFactory implementation to use. |
com.github.dockerjava.netty.NettyDockerCmdExecFactory |
String |
|
Whether to follow redirect filter. |
false |
boolean |
|
Whether to use logging filter. |
false |
boolean |
|
Maximum route connections. |
100 |
Integer |
|
Maximum total connections. |
100 |
Integer |
|
Additional configuration parameters as key/value pairs. |
Map |
||
Server address for docker registry. |
String |
||
Socket connection mode. |
true |
boolean |
|
Location containing the SSL certificate chain. |
String |
||
Password to authenticate with. |
String |
||
Use HTTPS communication. |
false |
boolean |
|
Check TLS. |
false |
boolean |
|
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 |
---|---|---|---|
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 |
|
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 |
|
Location containing the SSL certificate chain. |
String |
||
The fully qualified class name of the DockerCmdExecFactory implementation to use. |
com.github.dockerjava.netty.NettyDockerCmdExecFactory |
String |
|
To use the shared docker configuration. The option is a org.apache.camel.component.docker.DockerConfiguration type. |
DockerConfiguration |
||
Email address associated with the user. |
String |
||
Whether to enable auto configuration of the docker component. This is enabled by default. |
Boolean |
||
Whether to follow redirect filter. |
false |
Boolean |
|
Docker host. |
localhost |
String |
|
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 |
|
Whether to use logging filter. |
false |
Boolean |
|
Maximum route connections. |
100 |
Integer |
|
Maximum total connections. |
100 |
Integer |
|
Additional configuration parameters as key/value pairs. |
Map |
||
Password to authenticate with. |
String |
||
Docker port. |
2375 |
Integer |
|
Request timeout for response (in seconds). |
Integer |
||
Use HTTPS communication. |
false |
Boolean |
|
Server address for docker registry. |
String |
||
Socket connection mode. |
true |
Boolean |
|
Check TLS. |
false |
Boolean |
|
User name to authenticate with. |
String |