Linux Certif

Toute la documentation sur la certification Linux LPI

run

BSD mandoc

NAME

run - run a command on a machine at random

SYNOPSIS

[-aeiqv ] [-g rungroup1,...,rungroupN ] [-l username ] [-w node1,...,nodeN ] [-x node1,...,nodeN ] [command ... ]

DESCRIPTION

The utility can be used to run a command, or group of commands on a cluster of machines. The command or commands are run on a single node in the cluster, which is chosen at random. The following options are available:

-a

The -a option modifies the behavior of seq when dealing with stdin. Normally all commands from stdin are run on the same machine. Specifying the -a option causes each command to be run on a random node.

-e

Unless the -e option is specified, stderr from remote commands will not be reported to the user.

-i

The -i option will list information about the current cluster, and command groupings. It will also show you which command you are about to run, and your username if specified with the -l option.

-q

The -q option does not issue any commands, but displays information about the cluster.

-v

Prints the version of ClusterIt to the stdout, and exits.

-g

If the -g option is specified, followed by a comma separated list of group names, the command will only be run on that group of nodes. A node may be a part of more than one group if desired, however running without the -g option will run the command on the same node as many times as it appears in the file specified by the CLUSTER environment variable. This option is silently ignored if used with the -w option.

-l

If the -l option is specified, followed by a username, the commands will be run under that userid on the remote machines. Consideration must be taken for proper authentication, for this to work.

-w

If the -w option is specified, followed by a comma delimited list of machine names, the command will be run on each node in the list. Without this option, runs on the nodes listed in the file pointed to by the CLUSTER environment variable.

-x

The -x option can be used to exclude specific nodes from the cluster. The format is the same as the -w option, a comma delimited list of machine names. This option is silently ignored if used with the -w option.

ENVIRONMENT

utilizes the following environment variables.

CLUSTER

Contains a filename, which is a newline separated list of nodes in the cluster.

RCMD_CMD

Command to use to connect to remote machines. The command chosen must be able to connect with no password to the remote host. Defaults to rsh

RCMD_CMD_ARGS

Arguments to pass to the remote shell command. Defaults to none.

RCMD_USER

The username to connect to remote machines as by default.

DIAGNOSTICS

Exit status is 0 on success, 1 if an error occurs.

SEE ALSO

dsh(1), rsh(1), seq(1), kerberos(3), hosts.equiv5, rhosts(5)

HISTORY

The command appeared in clusterit 1.1.

AUTHOR

Run was written by Tim Rightnour.