ganeti-listrunner

NAME

ganeti-listrunner - Run commands in parallel over multiple machines

SYNOPSIS

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

DESCRIPTION

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.

OPTIONS

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.

-A

Use an existing ssh-agent instead of password authentication.

--args

Arguments to pass to executable (-x).

EXIT STATUS

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

EXAMPLE

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 runme.sh \
  -a seed.dat -a golden.dat \
  -h host1,host2,host3

SEE ALSO

dsh(1), cssh(1)