Options
When you create a command specification, you can also change the options
for executing the commands on the distributed hosts. Use the Options tab
to view or change options. You can change the number of hosts on
which a command will run at the same time; verify that a host is responding
before sending it commands, specify whether output will be streamed over
time or appear all at once; select maximum time in seconds to wait for a response from the remote shell; and specify which remote shell to use.
You can find more detailed help on the following elements of this window:
Number of hosts to run commands on concurrently
The slider and text box both display the number of hosts on which the command
specification will run at the same time. Allowable values
are between 1 and 64 hosts, with a default value of 64. You can change
this value by either dragging the slider to a new value, or by entering
a value in the text box. You may want to reduce the number of concurrent
hosts if you are experiencing network problems and you want to improve
performance.
Before running, verify that hosts will respond
Check this box if you want to make sure that hosts are online and responding
before running a command specification. By default, this checkbox
is unchecked, meaning that commands will be sent to all hosts without checking
whether they are available. Changing this value means that you want
to invest the time to check up front, which, if there are problems, should
result in a smaller wait time than the minute typically taken for the remote
shell command to time out.
Stream output
If checked, causes output to be streamed (displayed in the Execution Progress
dialog as it is received). If unchecked, causes output to be
collected and displayed only after command execution completes.
Maximum time in seconds to wait for response from the remote shell.
Specifies the time, in seconds, to wait for response from remote shell.
Remote Shell
Displays the remote shell under which distributed commands will be
run. The remote shell options for rsh listed in this section are
for the AIX platform. On Linux, these options could be different.
The default shell on AIX is rsh, and if the secure remote
shell is not installed, rsh will be the only option available.
You can enter options for either rsh or the secure remote
shell in the text box provided. Enter the options as you would enter
them on the command line.
Because the DCEM application is not interactive, you must configure
the secure remote shell to run in batch mode. If the secure remote
shell is not configured properly, and you are prompted for a password during
authentication, the command that you attempted to run cannot execute. You
must then click the stop button at the bottom of the Execution Progress
dialog to stop the execution.
Options for rsh include the following:
-f causes DCE credentials to be forwarded to remote
hosts. This option is valid only if the underlying rsh uses Kerberos
authentication and you have valid Kerberos credentials. It will be ignored
if Kerberos 5 is not the current authentication method, and authentication
will fail if the current DCE credentials are not marked forwardable.
-F causes the credentials on the remote system to be marked forwardable
(allowing them to be passed to another remote system). This setting will
also be ignored if Kerberos 5 is not the current authentication method.
DCEM supports a variety of secure remote shells and has been tested, to
a limited basis, using OpenSSH, a secure remote shell. If
a secure remote shell supports batch mode, you must enable the batch mode.
You
can do this either in the secure remote shell client configuration file
on the CSM server or in the secure remote shell options in the DCEM Options
Tab. (If the secure remote shell is installed, you can select the
Secure
Remote Shell radio button, and in the field where the options for this
selection display, you can type the flag that enables batch mode.)
For detailed information about secure remote shell client configuration,
see the specific secure remote shell documentation.