Evoking and detaching bash scripts from current shell -

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i'm have tad bit of difficulty developing bash based deployment scripts pipeline want run on openstack vm. there 4 scripts in total:

  1. head_node.sh - launches vm , attaches appropriate disk storage vm. once that's completed, runs scripts (2 , 3) sequentially passing command through ssh vm.

  2. install.sh - vm-side, installs of appropriate software needed pipeline.

  3. run.sh - vm-side, mounts storage on vm , downloads raw data object storage. runs final script, detaching process shell created ssh using nohup ./pipeline.sh &. reason want detach shell next portion largely compute , may take days finish. therefore, user shouldn't have keep shell open long , should run in background.

  4. pipeline.sh - vm-side, loop iterates through list of files, , sequential runs commands on , intermediate files. result analysed staged object storage. vm tells head node kill it.

now i'm running problem nohup. if launch pipeline.sh script (i.e. without nohup) , keep attached shell, runs smoothly. however, if detach script, errors out after first command in first iteration of loop. thinking wrong way? what's correct way this?

so how looks:

$./head_node.sh

head_node.sh

#!/bin/bash ... launched vm etc ssh $vm_ip './install.sh' ssh $vm_ip './run.sh' exit 0

install.sh - omitted - not important problem

run.sh

#!/bin/bash ... mounts storage downloads appropriate files nohup ./pipeline.sh > log & exit 0

pipeline.sh

#!/bin/bash f in $(find . -name '*ext')  process1 $f process2 $f ... done ... stage files object storage, unmount disks, additional cleanups ssh $head_node 'nova delete $vm_hash' exit 0

since i'm evoking run.sh script ssh instance, subprocesses launched script (namely pipeline.sh) not detach shell , error out on termination of ssh instance evoking run.sh. pipeline.sh script can detached calling head node, e.g., nohup ssh $vm_ip './pipeline.sh' &, keep session alive until end of pipeline.


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