# CLI Attach Node

The `attach-node` CLI command binds a specified node or nodes to an **existing cluster** as either a Master or Worker node.

## Syntax Example

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```javascript
pf9ctl attach-node
```

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All Available Commands and Flags

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```javascript
#pf9ctl attach-node --help

Attach nodes to existing cluster. One a time, multiple workers but only one master can be attached

Usage:
  pf9ctl attach-node [flags] cluster-name

Flags:
  -h, --help                help for attach-node
  -m, --master-ip strings   master node ip address
  -w, --worker-ip strings   worker node ip address

Global Flags:
      --verbose   print verbose logs
```

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{% hint style="danger" %}
**Important**

We have seen users who try to attach either a master or worker nodes to a cluster, without first creating a (master/worker) type cluster. This can lead to errors which can be confusing. Please ensure a cluster is up and running before attempting to attach a node.
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## Command Example

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```javascript
pf9ctl attach-node -m 172.20.7.66 -w 172.20.7.58 test-cluster
✓ Loaded Config Successfully
2021-05-26T11:58:01.9579Z	INFO	Worker node(s) [bf5364cf-e2fd-4500-97fb-0b01be26084f] attached to cluster
2021-05-26T11:58:03.6328Z	INFO	Master node(s) [615c1042-48a3-42e8-8003-ac135d12e6f4] attached to cluster
```

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