Package ganeti :: Module ssh :: Class SshRunner

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Class SshRunner

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Wrapper for SSH commands.

Instance Methods

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__init__(self, cluster_name)

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list

_BuildSshOptions(self, batch, ask_key, use_cluster_key, strict_host_check, private_key=None, quiet=True)
Builds a list with needed SSH options.

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BuildCmd(self, hostname, user, command, batch=True, ask_key=False, tty=False, use_cluster_key=True, strict_host_check=True, private_key=None, quiet=True)
Build an ssh command to execute a command on a remote node.

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utils.RunResult

Run(self, *args, **kwargs)
Runs a command on a remote node.

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boolean

CopyFileToNode(self, node, filename)
Copy a file to another node with scp.

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VerifyNodeHostname(self, node)
Verify hostname consistency via SSH.

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Method Details

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_BuildSshOptions(self, batch, ask_key, use_cluster_key, strict_host_check, private_key=None, quiet=True)

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Builds a list with needed SSH options.

Parameters:

batch - same as ssh's batch option
ask_key - allows ssh to ask for key confirmation; this parameter conflicts with the batch one
use_cluster_key - if True, use the cluster name as the HostKeyAlias name
strict_host_check - this makes the host key checking strict
private_key - use this private key instead of the default
quiet - whether to enable -q to ssh

Returns: list

the list of options ready to use in utils.RunCmd

BuildCmd(self, hostname, user, command, batch=True, ask_key=False, tty=False, use_cluster_key=True, strict_host_check=True, private_key=None, quiet=True)

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Build an ssh command to execute a command on a remote node.

Parameters:

hostname - the target host, string
user - user to auth as
command - the command
batch - if true, ssh will run in batch mode with no prompting
ask_key - if true, ssh will run with StrictHostKeyChecking=ask, so that we can connect to an unknown host (not valid in batch mode)
use_cluster_key - whether to expect and use the cluster-global SSH key
strict_host_check - whether to check the host's SSH key at all
private_key - use this private key instead of the default
quiet - whether to enable -q to ssh

Returns:

the ssh call to run 'command' on the remote host.

Run(self, *args, **kwargs)

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Runs a command on a remote node.

This method has the same return value as `utils.RunCmd()`, which it uses to launch ssh.

Args: see SshRunner.BuildCmd.

Returns: utils.RunResult: the result as from utils.RunCmd()

CopyFileToNode(self, node, filename)

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Copy a file to another node with scp.

Parameters:

node - node in the cluster
filename - absolute pathname of a local file

Returns: boolean

the success of the operation

VerifyNodeHostname(self, node)

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Verify hostname consistency via SSH.

This functions connects via ssh to a node and compares the hostname reported by the node to the name with have (the one that we connected to).

This is used to detect problems in ssh known_hosts files (conflicting known hosts) and inconsistencies between dns/hosts entries and local machine names

Parameters:

node - nodename of a host to check; can be short or full qualified hostname

Returns:

(success, detail), where:

success: True/False
detail: string with details