134 lines
4.7 KiB
Markdown
134 lines
4.7 KiB
Markdown
---
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description: |
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Communicators are the mechanism Packer uses to upload files, execute scripts,
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etc. with the machine being created.
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layout: docs
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page_title: 'Communicators - Templates'
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sidebar_current: 'docs-templates-communicators'
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---
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# Template Communicators
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Communicators are the mechanism Packer uses to upload files, execute
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scripts, etc. with the machine being created.
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Communicators are configured within the [builder](/docs/templates/builders.html)
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section. Packer currently supports three kinds of communicators:
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- `none` - No communicator will be used. If this is set, most provisioners
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also can't be used.
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- `ssh` - An SSH connection will be established to the machine. This is
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usually the default.
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- `winrm` - A WinRM connection will be established.
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In addition to the above, some builders have custom communicators they can
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use. For example, the Docker builder has a "docker" communicator that uses
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`docker exec` and `docker cp` to execute scripts and copy files.
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## Using a Communicator
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By default, the SSH communicator is usually used. Additional configuration
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may not even be necessary, since some builders such as Amazon automatically
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configure everything.
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However, to specify a communicator, you set the `communicator` key within
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a build. Multiple builds can have different communicators. Example:
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``` json
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{
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"builders": [
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{
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"type": "amazon-ebs",
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"communicator": "ssh"
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}
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]
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}
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```
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After specifying the `communicator`, you can specify a number of other
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configuration parameters for that communicator. These are documented below.
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## SSH Communicator
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The SSH communicator connects to the host via SSH. If you have an SSH
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agent enabled on the machine running Packer, it will automatically forward
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the SSH agent to the remote host.
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The SSH communicator has the following options:
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- `ssh_bastion_agent_auth` (boolean) - If true, the local SSH agent will
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be used to authenticate with the bastion host. Defaults to false.
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- `ssh_bastion_host` (string) - A bastion host to use for the actual
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SSH connection.
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- `ssh_bastion_password` (string) - The password to use to authenticate
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with the bastion host.
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- `ssh_bastion_port` (number) - The port of the bastion host. Defaults to 1.
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- `ssh_bastion_private_key_file` (string) - A private key file to use
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to authenticate with the bastion host.
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- `ssh_bastion_username` (string) - The username to connect to the bastion
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host.
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- `ssh_disable_agent_forwarding` (boolean) - If true, SSH agent forwarding
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will be disabled. Defaults to false.
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- `ssh_file_transfer_method` (`scp` or `sftp`) - How to transfer files, Secure
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copy (default) or SSH File Transfer Protocol.
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- `ssh_handshake_attempts` (number) - The number of handshakes to attempt
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with SSH once it can connect. This defaults to 10.
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- `ssh_host` (string) - The address to SSH to. This usually is automatically
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configured by the builder.
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- `ssh_password` (string) - A plaintext password to use to authenticate
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with SSH.
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- `ssh_port` (number) - The port to connect to SSH. This defaults to 22.
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- `ssh_private_key_file` (string) - Path to a PEM encoded private key
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file to use to authenticate with SSH.
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- `ssh_pty` (boolean) - If true, a PTY will be requested for the SSH
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connection. This defaults to false.
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- `ssh_timeout` (string) - The time to wait for SSH to become available.
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Packer uses this to determine when the machine has booted so this is
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usually quite long. Example value: "10m"
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- `ssh_username` (string) - The username to connect to SSH with. Required
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if using SSH.
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## WinRM Communicator
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The WinRM communicator has the following options.
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- `winrm_host` (string) - The address for WinRM to connect to.
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- `winrm_port` (number) - The WinRM port to connect to. This defaults to
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5985 for plain unencrypted connection and 5986 for SSL when `winrm_use_ssl` is set to true.
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- `winrm_username` (string) - The username to use to connect to WinRM.
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- `winrm_password` (string) - The password to use to connect to WinRM.
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- `winrm_timeout` (string) - The amount of time to wait for WinRM to
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become available. This defaults to "30m" since setting up a Windows
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machine generally takes a long time.
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- `winrm_use_ssl` (boolean) - If true, use HTTPS for WinRM
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- `winrm_insecure` (boolean) - If true, do not check server certificate
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chain and host name
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- `winrm_use_ntlm` (boolean) - If true, NTLM authentication will be used for WinRM,
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rather than default (basic authentication), removing the requirement for basic
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authentication to be enabled within the target guest. Further reading for remote
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connection authentication can be found [here](https://msdn.microsoft.com/en-us/library/aa384295(v=vs.85).aspx).
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