Failed to connect to the host via ssh: Permission denied while using ansible -m ping awsserver

 ansible -m ping awsserver

ycs1 | UNREACHABLE! => {
    "changed": false,
    "msg": "Failed to connect to the host via ssh: Permission denied (publickey,gssapi-keyex,gssapi-with-mic).\r\n",
    "unreachable": true
}
ycs2 | UNREACHABLE! => {
    "changed": false,
    "msg": "Failed to connect to the host via ssh: Permission denied (publickey).\r\n",
    "unreachable": true


======================

copy your key.pem file to a dir in the os and path this in ansible group_vars

and change mode to 400

 chmod 400 KeyPair.pem

else you will get err


WARNING: UNPROTECTED PRIVATE KEY FILE


then ping

Done
=================================================
ansible -m ping awsserver

ycs1 | SUCCESS => {
    "changed": false,
    "ping": "pong"
}
 [WARNING]: sftp transfer mechanism failed on []. Use ANSIBLE_DEBUG=1 to see detailed information

 [WARNING]: scp transfer mechanism failed on []. Use ANSIBLE_DEBUG=1 to see detailed information

ycs2 | FAILED! => {
    "changed": false,
    "module_stderr": "Shared connection to  closed.\r\n",
    "module_stdout": "Please login as the user \"ec2-user\" rather than the user \"root\".\r\n\r\n",
    "msg": "MODULE FAILURE",
    "rc": 0
}

===================

One success other one failed



Ref: https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-ansible-on-centos-7