# Puppet Client

The Puppet Agent updates the configuration on the node. It automatically runs regulary, for configuration details check the [configuration guide](../configuration/puppet_agent).

The puppet client can be manually triggered/run by calling following command on the client:

```bash
puppet agent -t
```

To only check what the client would actually do, without actually changing the systems configuration/files/etc. you can use the `--noop` option:

```bash
puppet agent -t --noop
```

To instruct the puppet client to use a specific puppet environment use:

```bash
puppet agent -t --environment my_environment
```
The client will keep this environment until
- either the puppet environment is removed from the server (i.e. the client will do a fallback to the default environment)
- you manually change the environment again



## Configuration
### Attach Node to Different Puppet Server

For testing purpose you might want to change the Puppet server to which a test node is attached to. To do so do, change the ``server`` in the ``[main]`` section of ``/etc/puppetlabs/puppet/puppet.conf`` accordingly.

Then delete the current host and CA certficate and the CRL:

   #. ``rm /etc/puppetlabs/puppet/ssl/certs/*``
   #. ``rm /etc/puppetlabs/puppet/ssl/crl.pem``

Finally run the puppet agent again.