ganeti-listrunner - Run commands in parallel over multiple machines


ganeti-listrunner -l logdir {-x executable | -c shell-cmd} {-f hostfile | -h hostlist} [-a aux-file] [-b batch-size] [-u username] [-A]


ganeti-listrunner is a tool to run commands in parallel over multiple machines. It differs from dsh or other tools in that it asks for the password once (if not using ssh-agent) and then reuses the password to connect to all machines, thus being easily usable even when public key authentication or Kerberos authentication is not available.

It can run either a command or a script (which gets uploaded first and deleted after execution) on a list of hosts provided either via a file (one host per line) or as a comma-separated list on the commandline. The output (stdout and stderr are merged) of the remote execution is written to a logfile. One logfile per host is written.


The options that can be passed to the program are as follows:

-l logdir
The directory under which the logfiles files should be written.
-x executable
The executable to copy and run on the target hosts.
-c shell-cmd
The shell command to run on the remote hosts.
-f hostfile
The file with the target hosts, one hostname per line.
-h hostlist
Comma-separated list of target hosts.
-a aux-file
A file to copy to the target hosts. Can be given multiple times, in which case all files will be copied to the temporary directory. The executable or the shell command will be run from the (temporary) directory where these files have been copied.
-b batch-size
The host list will be split into batches of batch-size which will be processed in parallel. The default if 15, and should be increased if faster processing is needed.
-u username
Username to connect as instead of the default root username.
Use an existing ssh-agent instead of password authentication.
Arguments to pass to executable (-x).


The exist status of the command will be zero, unless it was aborted in some way (e.g. ^C).


Run a command on a list of hosts:

listrunner -l logdir -c "uname -a" -h host1,host2,host3

Upload a script, some auxiliary files and run the script:

listrunner -l logdir -x \
  -a seed.dat -a golden.dat \
  -h host1,host2,host3


dsh(1), cssh(1)