gpssh Provides ssh access to multiple hosts at once. Synopsis gpssh { -f hostfile_gpssh | - h hostname [-h hostname ...] } [-v] [-e] [bash_command] gpssh -? gpssh --version Description The gpssh utility allows you to run bash shell commands on multiple hosts at once using SSH (secure shell). You can execute a single command by specifying it on the command-line, or omit the command to enter into an interactive command-line session. To specify the hosts involved in the SSH session, use the -f option to specify a file containing a list of host names, or use the -h option to name single host names on the command-line. At least one host name (-h) or a host file (-f) is required. Note that the current host is not included in the session by default — to include the local host, you must explicitly declare it in the list of hosts involved in the session. Before using gpssh, you must have a trusted host setup between the hosts involved in the SSH session. You can use the utility gpssh-exkeys to update the known host files and exchange public keys between hosts if you have not done so already. If you do not specify a command on the command-line, gpssh will go into interactive mode. At the gpssh command prompt (=>), you can enter a command as you would in a regular bash terminal command-line, and the command will be executed on all hosts involved in the session. To end an interactive session, press CTRL+D on the keyboard or type exit or quit. If a user name is not specified in the host file, gpssh will execute commands as the currently logged in user. To determine the currently logged in user, do a whoami command. By default, gpssh goes to $HOME of the session user on the remote hosts after login. To ensure commands are executed correctly on all remote hosts, you should always enter absolute paths. Options bash_command A bash shell command to execute on all hosts involved in this session (optionally enclosed in quotes). If not specified, gpssh will start an interactive session. -e (echo) Optional. Echoes the commands passed to each host and their resulting output while running in non-interactive mode. -f hostfile_gpssh Specifies the name of a file that contains a list of hosts that will participate in this SSH session. The host name is required, and you can optionally specify an alternate user name and/or SSH port number per host. The syntax of the host file is one host per line as follows: [username@]hostname[:ssh_port] -h hostname Specifies a single host name that will participate in this SSH session. You can use the -h option multiple times to specify multiple host names. -v (verbose mode) Optional. Reports additional messages in addition to the command output when running in non-interactive mode. --version Displays the version of this utility. -? (help) Displays the online help. Examples Start an interactive group SSH session with all hosts listed in the file hostfile_gpssh: $ gpssh -f hostfile_gpssh At the gpssh interactive command prompt, run a shell command on all the hosts involved in this session. => ls -a /data/primary/* Exit an interactive session: => exit => quit Start a non-interactive group SSH session with the hosts named dw1 and dw2 and pass a file containing several commands named command_file to gpssh: $ gpssh -h sdw1 -h sdw2 -v -e < command_file Execute single commands in non-interactive mode on hosts sdw2 and localhost: $ gpssh -h sdw2 -h localhost -v -e 'ls -a /data/primary/*' $ gpssh -h sdw2 -h localhost -v -e 'echo $GPHOME' $ gpssh -h sdw2 -h localhost -v -e 'ls -1 | wc -l' |