Docker Node — Input & Output

Output Ports

All 31 operations share the same two output ports.

Port	Trigger Condition	Description
success	Docker API returned 2xx	The operation completed successfully. Output data is available in the node's output object and can be referenced in downstream expressions.
error	Docker API error or connection failure	The operation failed. The error object includes `errorCode`, `message`, and `httpStatus`. Route to an alert or retry node as needed.

Common Error Codes

Error Code	Description	Typical Operations
ContainerNotFound	The specified container ID or name does not exist on the connected Docker daemon. Verify the ID is correct and the container has not been removed.	container/*
ImageNotFound	The specified image ID or name is not present in local image storage. Pull the image first using `image/pull` before referencing it in `container/create`.	image/*, container/create
DaemonUnreachable	BizFirst could not establish a connection to the Docker daemon at the configured `DockerHost`. Check the socket path, TCP address, TLS certificates, and firewall rules.	All operations
PermissionDenied	The BizFirst workflow runner process does not have permission to access the Docker socket or the TLS credentials are invalid. Ensure the runner user is in the `docker` group or the socket permissions are set correctly.	All operations
PortAlreadyInUse	The host port specified in `PortBindings` is already bound by another process or container. Use a different host port or stop the conflicting container.	container/create, container/start

Operation Output Schemas

container/create

Field	Type	Description
`containerId`	string	The full 64-character container ID assigned by the Docker daemon.
`name`	string	The container name (prefixed with `/` by Docker, e.g. `/my-app`).
`status`	string	Initial container status. Will be `created` immediately after creation before `container/start` is called.
`warnings`	array	Array of warning strings returned by the Docker daemon during creation (e.g. deprecated API usage). Empty array when none.

{
  "containerId": "a3f8c2e1b0d94f5e6a7b8c9d0e1f2a3b4c5d6e7f8a9b0c1d2e3f4a5b6c7d8e9f",
  "name": "/my-app-container",
  "status": "created",
  "warnings": []
}

container/exec

Field	Type	Description
`exitCode`	integer	Exit code returned by the executed command. `0` indicates success. Non-zero indicates an error condition in the executed program.
`stdout`	string	Standard output captured from the command execution. Empty string if the command produced no output.
`stderr`	string	Standard error captured from the command execution. Contains error messages when `exitCode` is non-zero.

{
  "exitCode": 0,
  "stdout": "Applying 3 migrations...\nMigration 0012_add_user_preferences applied.\nMigration 0013_create_audit_log applied.\nMigration 0014_add_indexes applied.\nDone.",
  "stderr": ""
}

container/logs

Field	Type	Description
`logs`	string	Combined stdout and stderr log content as a single string. Lines are separated by newline characters.
`lineCount`	integer	Total number of lines returned. Reflects the `Tail` limit if set, otherwise the total available log lines.

{
  "logs": "2026-05-23T08:00:01Z Starting server on port 8080\n2026-05-23T08:00:02Z Database connection established\n2026-05-23T08:00:15Z Health check passed",
  "lineCount": 3
}

container/stats

Field	Type	Description
`cpuPercent`	float	Current CPU usage as a percentage of total available CPU across all cores.
`memoryUsageMB`	float	Current memory consumed by the container in megabytes.
`memoryLimitMB`	float	Memory limit configured for the container in megabytes. Returns host total memory if no limit is set.
`networkRxMB`	float	Total megabytes received over the network interface since container start.
`networkTxMB`	float	Total megabytes transmitted over the network interface since container start.

{
  "cpuPercent": 12.4,
  "memoryUsageMB": 248.6,
  "memoryLimitMB": 1024.0,
  "networkRxMB": 14.2,
  "networkTxMB": 3.8
}

image/pull

Field	Type	Description
`imageName`	string	The fully qualified image repository name that was pulled (e.g. `nginx`, `myregistry.io/app`).
`tag`	string	The resolved tag for the pulled image.
`digest`	string	The content-addressable SHA256 digest of the pulled image manifest. Use this for deterministic references in subsequent operations.
`size`	integer	Uncompressed image size in bytes.

{
  "imageName": "nginx",
  "tag": "1.25",
  "digest": "sha256:a3e7c2f1b9d84e5f6a7b8c9d0e1f2a3b4c5d6e7f8a9b0c1d2e3f4a5b6c7d8e9",
  "size": 187654321
}

system/info

Field	Type	Description
`dockerVersion`	string	Docker engine version string (e.g. `24.0.7`).
`osType`	string	Host operating system type as reported by the daemon (e.g. `linux`).
`architecture`	string	CPU architecture of the Docker host (e.g. `x86_64`, `aarch64`).
`totalCpus`	integer	Number of CPU cores available to the Docker daemon.
`totalMemoryMB`	integer	Total system memory available to the Docker daemon in megabytes.

{
  "dockerVersion": "24.0.7",
  "osType": "linux",
  "architecture": "x86_64",
  "totalCpus": 8,
  "totalMemoryMB": 16384
}

Accessing Output in Downstream Nodes

Expression reference: Use the node name to reference output fields in downstream expressions. For example, if a container/create node is named createApp and a container/exec node is named runMigration:

{{ nodes.createApp.output.containerId }} — Container ID from create
{{ nodes.runMigration.output.exitCode }} — Exit code from exec
{{ nodes.runMigration.output.stdout }} — Stdout from exec
{{ nodes.pullImage.output.digest }} — Image digest from pull