Catch more exceptions.

app/scheduler_functions.py

@@ -42,25 +42,22 @@ def checkout_jobs():
                 mem_reservation=job.mem_mb * (10 ** 6)
             )
             _restart_policy = docker.types.RestartPolicy(condition='none')
-            '''
-            ' Create the service with the prepared values.
-            '
-            ' Note: A service reserves hardware ressources. In case no worker
-            '       node has the required ressources available (not reserved),
-            '       the service gets queued by the Docker engine until a node
-            '       is able to meet the requirements.
-            '''
-            service = client.services.create(
-                _image,
-                command=_command,
-                constraints=_constraints,
-                labels=_labels,
-                mounts=_mounts,
-                name=_name,
-                resources=_resources,
-                restart_policy=_restart_policy
-            )
-            job.status = 'scheduled'
+            try:
+                service = client.services.create(
+                    _image,
+                    command=_command,
+                    constraints=_constraints,
+                    labels=_labels,
+                    mounts=_mounts,
+                    name=_name,
+                    resources=_resources,
+                    restart_policy=_restart_policy
+                )
+                job.status = 'scheduled'
+            except docker.errors.APIError:
+                job.status = 'failed'
+                print('[ERROR] {}: client.services.create raised APIError'
+                      .format(job.id))
         for job in jobs.filter(Job.status != 'complete',
                                Job.status != 'failed',
                                Job.status != 'submitted').all():
@@ -70,6 +67,16 @@ def checkout_jobs():
                 if job.status == 'complete' or job.status == 'failed':
                     job.end_date = datetime.utcnow()
                     service.remove()
+            except docker.errors.APIError:
+                job.status = 'failed'
+                print('[ERROR] {}: client.services.get raised APIError'
+                      .format(job.id))
             except docker.errors.NotFound:
                 job.status = 'failed'
+                print('[ERROR] {}: client.services.get raised NotFound'
+                      .format(job.id))
+            except docker.errors.InvalidVersion:
+                job.status = 'failed'
+                print('[ERROR] {}: client.services.get raised InvalidVersion'
+                      .format(job.id))
         db.session.commit()