Create EC2 Instance by Ansible Failed with ec2: error: unrecognized arguments: - amazon-ec2

Question

I am newbie to Ansible and follow this tutorial to create a security group and an ec2 instance. The security group is created successfully, but creating ec2 instance is failed by ec2:
error: unrecognized arguments:
/home/ec2-user/.ansible/tmp/ansible-tmp-14244....
I did set up aws credentials and asnsible variables properly as below
# AWS Credentials
export AWS_ACCESS_KEY_ID=xxx
export AWS_SECRET_ACCESS_KEY=xxx
# EC2 Environment Variables
export ANSIBLE_HOSTS=/etc/ansible/ec2.py
export EC2_INI_PATH=/etc/ansible/ec2.ini
The files and output are showed as follow. Any ideas for this issue? Thanks for your Help!
$ cat group_vars/all
# Variables listed here are applicable to all host groups
key_name: sobrr-staging.pem
aws_region: cn-north-1
ami_id: ami-9e0c9ea7
instance_type: m1.small
$ cat basic-create.yml
# Basic provisioning example
- name: Create AWS resources
hosts: localhost
connection: local
gather_facts: False
tasks:
- name: Create security group
ec2_group:
name: my-security-group
description: "A Security group"
region: "{{aws_region}}"
rules:
- proto: tcp
type: ssh
from_port: 22
to_port: 22
cidr_ip: 0.0.0.0/0
rules_egress:
- proto: all
type: all
cidr_ip: 0.0.0.0/0
register: basic_firewall
- name: debug basic_firewall
debug: 'msg="{{ basic_firewall }}"'
- name: create an EC2 instance
local_action:
module: ec2
key_name: "{{key_name}}"
region: "{{aws_region}}"
group_id: "{{basic_firewall.group_id}}"
instance_type: "{{instance_type}}"
image: "{{ami_id}}"
count: 1
wait: yes
register: basic_ec2
- name: debug instance start
debug: 'msg="{{ basic_ec2 }}"'
OUTPUT
ansible-playbook -i /etc/ansible/hosts -vvvv basic-create.yml
/usr/lib64/python2.6/site-packages/Crypto/Util/number.py:57: PowmInsecureWarning: Not using mpz_powm_sec. You should rebuild using libgmp >= 5 to avoid timing attack vulnerability.
_warn("Not using mpz_powm_sec. You should rebuild using libgmp >= 5 to avoid timing attack vulnerability.", PowmInsecureWarning)
PLAY [Create AWS resources] ***************************************************
TASK: [Create security group] *************************************************
<localhost> region=cn-north-1 description=A Security group name=my-security-group
<localhost>
<localhost>
<localhost> u'LANG=en_US.UTF-8 LC_CTYPE=en_US.UTF-8 /usr/bin/python /home/ec2-user/.ansible/tmp/ansible-tmp-1424461765.15-98406246607462/ec2_group; rm -rf /home/ec2-user/.ansible/tmp/ansible-tmp-1424461765.15-98406246607462/ >/dev/null 2>&1']
ok: [localhost] => {"changed": false, "group_id": "sg-63fae101"}
TASK: [debug basic_firewall] **************************************************
ok: [localhost] => {
"msg": "{'invocation': {'module_name': u'ec2_group', 'module_args': ''}, 'changed': False, 'group_id': 'sg-63fae101'}"
}
TASK: [create an EC2 instance] ************************************************
<127.0.0.1> instance_type=m1.small image=ami-9e0c9ea7 group_id=sg-63fae101 region=cn-north-1 key_name=sobrr-staging.pem
<127.0.0.1>
<127.0.0.1>
<127.0.0.1>
<127.0.0.1> u'LANG=en_US.UTF-8 LC_CTYPE=en_US.UTF-8 /usr/bin/env python /home/ec2-user/.ansible/tmp/ansible-tmp-1424461765.54-184834253412898/ec2 /home/ec2-user/.ansible/tmp/ansible-tmp-1424461765.54-184834253412898/arguments; rm -rf /home/ec2-user/.ansible/tmp/ansible-tmp-1424461765.54-184834253412898/ >/dev/null 2>&1']
failed: [localhost -> 127.0.0.1] => {"failed": true, "parsed": false}
usage: ec2 [-h] [--list] [--host HOST] [--refresh-cache]
ec2: error: unrecognized arguments: /home/ec2-user/.ansible/tmp/ansible-tmp-1424461765.54-184834253412898/arguments
FATAL: all hosts have already failed -- aborting
PLAY RECAP ********************************************************************
to retry, use: --limit #/home/ec2-user/basic-create.retry
localhost : ok=2 changed=0 unreachable=0 failed=1

Answer 1

The key_name parameter in Ansible ec2 module refers to the ssh public key you uploaded or created(if you want to reuse the previous key) in your AWS account. You may want to verify it matches the name you specified in the AWS account.
My guess is that the key name in you AWS account is sobrr-staging, not sobrr-staging.pem
Try use sobrr-staging and see how that goes.