Django's migrate command on Amazon EBS is killed

I'm using Amazon's EBS and Django 1.8.2. Here is my container commands,

container_commands:
  01_wsgipass:
    command: 'echo "WSGIPassAuthorization On" >> ../wsgi.conf'
  02_makemigrations:
    command: "source /opt/python/run/venv/bin/activate && python manage.py makemigrations --merge --noinput"
    leader_only: true
  03_migrate:
    command: "source /opt/python/run/venv/bin/activate && python manage.py migrate --noinput"
    leader_only: true

For some reasons the migrate command is being killed. All migrations are working fine even with a fresh database in my local. But following is the error appearing on eb-activity.log.

Synchronizing apps without migrations:
  Creating tables...
  Running deferred SQL...
  Installing custom SQL...
  Running migrations:
  Rendering model states.../bin/sh: line 1: 21228 Killed                  python manage.py migrate --noinput
   (ElasticBeanstalk::ExternalInvocationError)

Note: The same container commands were working fine without any issues earlier at EBS. I tried with --verbose 3 with migrate command but didn't get any other debug messages.

Any solutions? Thanks in advance.