Nomad auto-revert test

nomad-auto-revert-test.sh

#/bin/bash

# Creates a stable test job with auto_revert=true in Nomad,
# updates it a bunch of times to force the job version to 256,
# then creates an unstable job. Nomad will roll back to 255
# instead of 256.

sudo tee /tmp/pass.nomad << EOF > /dev/null
job "test" {
  datacenters = ["dc1"]
  region      = "global"
  type        = "service"

  update {
    health_check     = "task_states"
    min_healthy_time = "1s"
    healthy_deadline = "5s"
    auto_revert      = "true"
  }

  group "pass" {
    count = 1

    task "tail" {
      driver = "exec"

      config {
        command = "tail"
        args = [
          "-f", "/dev/null",
        ]
      }
    }
  }
}
EOF

sudo tee /tmp/fail.nomad << EOF > /dev/null
job "test" {
  datacenters = ["dc1"]
  region      = "global"
  type        = "service"

  update {
    health_check     = "task_states"
    min_healthy_time = "1s"
    healthy_deadline = "5s"
    auto_revert      = "true"
  }

  group "fail" {
    count = 1

    task "tail" {
      driver = "exec"

      config {
        command = "tail"
        args = [
          "-f", "/dev/DNE",
        ]
      }
    }
  }
}
EOF

ver=0
while [ $ver -lt 256 ]; do
	echo "Version: $ver"

        sed -E "s/    task \"tail(_[0-9])?[0-9]*\" \{/    task \"tail_${ver}\" \{/" /tmp/pass.nomad > /tmp/test.nomad
	nomad run /tmp/test.nomad

        stable=$(nomad job history -json -version $ver test 2>/dev/null | jq '.Stable')

	while [ "$stable" != "true" ]; do
		stable=$(nomad job history -json -version $ver test 2>/dev/null | jq '.Stable')
	done

	ver=$(($ver+1))
done

# Create stable version 256
sed -E "s/    task \"tail(_[0-9])?[0-9]*\" \{/    task \"tail_256\" \{/" /tmp/pass.nomad > /tmp/test.nomad
nomad run /tmp/test.nomad

nomad deployment list | head
nomad job status test
nomad job history test

# Create unstable version 257
nomad run /tmp/fail.nomad
sleep 5

# Note that it rolls back to 255 instead of 256
nomad deployment list | head
nomad job status test
nomad job history test