SSH Connection

The SSH connection type provides connection to use SSHHook to run commands on a remote server using SSHOperator or transfer file from/to the remote server using SFTPOperator.

Configuring the Connection

Host (required)

The Remote host to connect.

Username (optional)

The Username to connect to the remote_host.

Password (optional)

Specify the password of the username to connect to the remote_host.

Port (optional)

Port of remote host to connect. Default is 22.

Extra (optional)

Specify the extra parameters (as json dictionary) that can be used in ssh connection. The following parameters out of the standard python parameters are supported:

  • key_file - Full Path of the private SSH Key file that will be used to connect to the remote_host.

  • private_key - Content of the private key used to connect to the remote_host.

  • timeout - An optional timeout (in seconds) for the TCP connect. Default is 10.

  • compress - true to ask the remote client/server to compress traffic; false to refuse compression. Default is true.

  • no_host_key_check - Set to false to restrict connecting to hosts with no entries in ~/.ssh/known_hosts (Hosts file). This provides maximum protection against trojan horse attacks, but can be troublesome when the /etc/ssh/ssh_known_hosts file is poorly maintained or connections to new hosts are frequently made. This option forces the user to manually add all new hosts. Default is true, ssh will automatically add new host keys to the user known hosts files.

  • allow_host_key_change - Set to true if you want to allow connecting to hosts that has host key changed or when you get ‘REMOTE HOST IDENTIFICATION HAS CHANGED’ error. This wont protect against Man-In-The-Middle attacks. Other possible solution is to remove the host entry from ~/.ssh/known_hosts file. Default is false.

Example “extras” field:

   "key_file": "/home/airflow/.ssh/id_rsa",
   "timeout": "10",
   "compress": "false",
   "no_host_key_check": "false",
   "allow_host_key_change": "false"

When specifying the connection as URI (in AIRFLOW_CONN_* variable) you should specify it following the standard syntax of connections, where extras are passed as parameters of the URI (note that all components of the URI should be URL-encoded).

Example connection string with key_file (path to key file provided in connection):

export AIRFLOW_CONN_MAIN_SERVER='ssh://user:pass@localhost:22?timeout=10&compress=false&no_host_key_check=false&allow_host_key_change=true&key_file=%2Fhome%2Fairflow%2F.ssh%2Fid_rsa'

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