Ansible playbook with jenkins not working

Question

So I have an EC2 instance that has ansible and Jenkins on it. I'm trying to copy a few files from one host to another. I executed the ansible playbook which I've written specifically for this and it worked perfectly fine. But when I tried doing the same using Jenkins, It fails to give the following error:

fatal: [172.xx.xx.xx]: UNREACHABLE! => {"changed": false, "msg": "Failed to connect to the host via ssh: no such identity: /home/ec2-user/.ssh/Host_Keypair.pem: Permission denied\r\nPermission denied (publickey).\r\n", "unreachable": true}
to retry, use: --limit @/var/lib/jenkins/workspace/Ansible/copy.retr

Answer 1

When you execute the playbook under Jenkins, your Jenkins does not have the access to /home/ec2-user/.ssh/Host_Keypair.pem key to authenticate on a remote server. 

What you can do is, copy your Host_Keypair.pem somewhere where Jenkins has all the required permissions and can read the ssh key required to connect to a remote host.