Docker Compose/Stack Placeholder Template Examples

docker-compose.yaml

#file: noinspection SpellCheckingInspection
# https://docs.docker.com/engine/reference/commandline/service_create/#create-services-using-templates
# https://docs.docker.com/config/containers/logging/awslogs/#tag
# https://docs.docker.com/config/containers/logging/log_tags/
# https://forums.docker.com/t/example-usage-of-docker-swarm-template-placeholders/73859
services:
    service:
        image: busybox
        command: env
        hostname: '{{.Task.Name}}-{{.Node.Hostname}}'
        logging:
            driver: awslogs
            options:
                awslogs-stream: '{{.Node.Hostname}}/{{.Task.Name}}'
                ## or
                #tag: '{{.Node.Hostname}}/{{.Name}}'
                awslogs-group: '{{.Service.Name}}/${STACK_ENV}'
                awslogs-region: eu-west-2
        environment:
            NODE_ID: '{{.Node.ID}}'
            NODE_HOSTNAME: '{{.Node.Hostname}}'

            SERVICE_ID: '{{.Service.ID}}'
            SERVICE_NAME: '{{.Service.Name}}'
            SERVICE_LABELS: '{{.Service.Labels}}'

            TASK_ID: '{{.Task.ID}}'
            TASK_NAME: '{{.Task.Name}}'
            TASK_SLOT: '{{.Task.Slot}}'

            STACK_NAMESPACE: '{{index .Service.Labels "com.docker.stack.namespace"}}'


## example values
#    NODE_HOSTNAME=laptop
#    NODE_ID=tsnacyg4e828z5zzrvzt2u6qq
#
#    SERVICE_ID=jq94b58o6phfgbzmmo1zpqe5h
#    SERVICE_LABELS=map[com.docker.stack.image:busybox com.docker.stack.namespace:stackname]
#    SERVICE_NAME=stackname_test-service
#
#    TASK_ID=y2o4gavzb8zg7jq40cjv6q6va
#    TASK_NAME=stackname_test-service.1.y2o4gavzb8zg7jq40cjv6q6va
#    TASK_SLOT=1