Stewards little helper
Take a script/program, and SCP it to 1+ nodes.
Connect via SSH, execute the script, and get the result back.
// Basic idea of operation:
// - Will load all the ip adresses and hosts from the hosts.txt file.
// - Will try to copy the script file to the host.
// - Will try to execute the script file on the host.
//
// If successful an entry will be made in the done.log file, followed by the
// output of the script, and the node is removed from the hosts.txt file.
//
// If unsuccessful an entry will be made in the failed.log file, followed by the
// output of the script, and the node is removed from the hosts.txt file.
//
// If unable to initiate connection, an error will be printed to the console,
// and the node name will be kept in the hosts.txt file so it will be retried on
// the next run.
//
// The program will run until the hosts.txt file is empty.
The HOSTNAME from hosts.txt is exported into the script as an environmental variable upon script execution. This let's you use the shell variable $HOSTNAME in the script if needed.
Check out example script file script-test.sh.
Usage of littlesteward:
-idRSAFile string
the id rsa file to use for ssh authentication
-script string
the script to exexute
-sshUser string
ssh user idEntries in the host file should be in the format:
192.168.0.1,myhostname1
192.168.0.2,myhostname2
Hosts where the script have succeeded successfully will be automatically moved from the hosts.txt file to the done.log file, so the script will not be rerun again on successful nodes.
Nodes where the script failed to be executed, followed by the error message from the script execution.
Failed nodes will also be removed from the hosts.txt file.
NB: When rerunning on failed nodes, the failed nodes can be copied directly into the hosts.txt file when you want to retry. Only the first two ip and hostname comma separated values are read, and the error message are discarded, so it is not necessary to remove the error message when copying.