25.4 SSH tunnels and PEcAn
Many of the
PEcAn.remote functions assume that a tunnel is already open.
If working from the web interface, the tunnel will be opened for you by some under-the-hood PHP and Bash code, but if debugging or working locally, you will have to create the tunnel yourself.
The best way to do this is to create the tunnel first, outside of R, as described above.
(In the following examples, I’ll use my username
ashiklom connecting to the
test-pecan server with a socket stored in
To follow along, replace these with your own username and designated server, respectively).
ssh -nNf -o ControlMaster=yes -S /tmp/testpecan email@example.com
Then, in R, create a
host object, which is just a list containing the elements
name (hostname) and
tunnel (path to tunnel file).
<- list(name = "test-pecan.bu.edu", tunnel = "/tmp/testpecan")my_host
This host object can then be used in any of the remote execution functions.