Nomad: Running multiple command in Docker driver

[hessam61]

Nomad version

Output from 0.6.3

Operating system and Environment details

centos7

Issue

Nomad seems to escape && when using multiple arguments. For my use case, I need to run few python modules in order. This is done in docker-compose as follow:

command: >
  bash -c "python -m module_a &&
  python -m module_b &&
  python -m module_c"

Similarly, in my Nomad job, I passed these modules as arguments:

command = "/bin/bash"
args = ["-c", "python -m module_a", "&&","
      "python -m module_b", "&&",
      "python -m module_c"]

However, when I run my job it runs module_a, and issue exit code 0. Nomad then restart the job, and rerun module_a, and enters a loop. It seems to escape &&, and ignore the rest of the arguments:

10/20/17 10:22:15 EDT  Restarting  Task restarting in 18.277681215s
10/20/17 10:22:15 EDT  Terminated  Exit Code: 0
10/20/17 10:22:11 EDT  Started     Task started by client
10/20/17 10:21:55 EDT  Restarting  Task restarting in 16.186283945s
10/20/17 10:21:55 EDT  Terminated  Exit Code: 0
10/20/17 10:21:51 EDT  Started     Task started by client
10/20/17 10:21:36 EDT  Restarting  Task restarting in 15.145157341s
10/20/17 10:21:36 EDT  Terminated  Exit Code: 0
10/20/17 10:21:32 EDT  Started     Task started by client
10/20/17 10:21:13 EDT  Restarting  Task restarting in 18.282284077s

I know this is a desired behavior, but I don't understand why the rest of the arguments are being ignored. Is there a workaround for this?

[schmichael]

Can you paste the exact args you're using? There seems to be a trailing " on the first line of your paste.

Have you tried putting all of the arguments after "-c" into a single string? I believe this behave as you intend:

command = "/bin/bash"
args = ["-c", "python -m m1 && python -m m2 && python -m m3"]

[schmichael]

I'm going to close for now, but feel free to reopen if bash quoting was not the issue!