I could not find the real reason why the SSH on EC2 instance running CentOS
was not able to connect. The workaround I applied was to write a module
which try to connect host over SSH for given number of times and return
success when it is successful so that further plays won't fail because of
unreachable error.
*wait_for_SSH.py*
#!/usr/bin/python
'''
module: wait_for_SSH
short_description: Waits for a host to be SSH connectable.
description:
- Tries to Ansible ping(not ICMP ping) to host as per the passed
parameters
options:
host:
description:
- A resolvable hostname or IP address to ansible ping
required: true
retries:
description:
- maximum number of times to retry
required: false
default: 10
delay:
description:
- number of seconds to wait between two consecutive pings
required: false
default: 5
'''
from ansible.module_utils.basic import *
from subprocess import call
import time
def validate_params(module, retries, delay):
if retries < 0:
module.fail_json(msg="retries should be greater than 0")
if delay < 0:
module.fail_json(msg="delay should be greater than 0")
return
def main():
fields = {
"host": {"required": True, "type": "str"},
"retries": {"required": False, "type": "int", "default": 10},
"delay": {"required": False, "type": "int", "default": 5}
}
module = AnsibleModule(argument_spec=fields)
host = module.params['host']
retries = module.params['retries']
delay = module.params['delay']
count = 0
output = 1
validate_params(module, retries, delay)
while (count < retries) and (output != 0):
if delay:
time.sleep(delay)
output = call(["ansible", "all", "-i", ","+host, "-m", "ping"])
count += 1
response = {"output" : output}
module.exit_json(changed=False, output=response)
if __name__ == '__main__':
main()
And executed it after wait_for port 22.
...
# Wait only for running instances because 'ec2_server' might contain
terminated instances to fulfil exact_count condition
- name: wait for ssh server to be running
wait_for: host={{ item.public_dns_name }} port=22 search_regex=OpenSSH
with_items: "{{ec2_server.instances | default([])}}"
when: item.state == 'running'
# wait_for_SSH is our custom module which tries to Ansible ping on
created instances until it is successful as per retries specified(bug AD-3)
- name: Ensure SSH is running
wait_for_SSH:
host: "{{item.private_ip}}"
register: moduleoutput
with_items: "{{ec2_server.instances | default([])}}"
when: item.state == 'running'
..<<further plays>>...
Thanks,
Nirav
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