ssh_helper.sh

The ssh helper is useful on those clusters where the submit node cannot connect to the jsonrpc url (because a firewall is blocking that port).

Essentially, it runs the part of the client that downloads the idle job list, then transfers that to the cluster head node to be read by the client.

This is usually run as a cron job at some interval.

Steps

Download job list from server.
Save as a json file in a temporary directory.
scp the file to the cluster submit node. This generally requires an ssh key to be installed.

Use a different ssh key for each cluster, using a config file to select the correct one.

~/.ssh/config:

Host SUBMITNODE
    User REMOTEUSERNAME
    IdentityFile ~/.ssh/PRIVATE_KEY

Since you're going to want to use a key without a passphrase (otherwise this would be rather pointless), it helps to add some security.

On the SUBMITNODE:

~/.ssh/authorized_keys:

from="SSH_NODE",command="scp -f ~/glidein_state" PUBLIC_KEY

This restricts the key to only connect from your node, and only scp the glidein state file.

If for some reason the submit node doesn't have a working cron, you can remotely call the client from a machine with cron.

~/.ssh/authorized_keys:

from="SSH_NODE",command="/usr/bin/python PATH_TO_PYGLIDEIN/client.py --config=CONFIG_FILE" PUBLIC_KEY

This restricts the key to only connect from your node, and only execute the client command.