How do I correctly add worker nodes to my cluster?

I am trying to create a cluster with the following parameters on Google Cloud:

1. 1 Master
2. 7 Worker nodes
3. Each of them with 1 vCPU
4. The master node should get full SSD capacity and the worker nodes should get equal shares of standard disk capacity.

This is my code:

#Create the cluster
CLUSTER = '{}-cluster'.format(PROJECT)
!gcloud dataproc clusters create $CLUSTER 
    --image-version 1.5-ubuntu18 --single-node 
    --master-machine-type n1-standard-1 
    --master-boot-disk-type pd-ssd --master-boot-disk-size 100 
    --num-workers 7 
    --worker-machine-type n1-standard-1 
    --worker-boot-disk-type pd-standard --worker-boot-disk-size 200 
    --max-idle 3600s 

This is my error:

RROR: (gcloud.dataproc.clusters.create) argument --single-node: At most one of --single-node | --num-secondary-workers --num-workers --secondary-worker-type can be specified.

Updated attempt:

#Create the cluster
CLUSTER = '{}-cluster'.format(PROJECT)
!gcloud dataproc clusters create $CLUSTER 
    --image-version 1.5-ubuntu18 
    --master-machine-type n1-standard-1 
    --master-boot-disk-type pd-ssd --master-boot-disk-size 100 
    --num-secondary-workers = 7 
    --secondary-worker-type=non-preemptible 
    --secondary-worker-boot-disk-type pd-standard 
    --secondary-worker-boot-disk-size=200 
    --max-idle 3600s 
    --initialization-actions=gs://goog-dataproc-initialization-actions-$REGION/python/pip-install.sh 
    --metadata=PIP_PACKAGES=tensorflow==2.4.0

I don’t follow what I am doing wrong here. Can anyone advise?

Answer

The documentation should help gcloud dataproc clusters create. It explains that:

• --single-node says “Create a single node cluster” which is not what you want, so you don’t want to include it.
• You want a “Multi-node cluster” so you want a combination of --num-secondary-workers and --num-workers.

The documentation describes Secondary workers