How to create EC2 instance by docker-machine with exists key pair? - amazon-ec2

Question

Use this way to create an instance on aws:
docker-machine create \
-d amazonec2 \
--amazonec2-region ap-northeast-1 \
--amazonec2-zone a \
--amazonec2-ami ami-XXXXXX \
--amazonec2-keypair-name my_key_pair \
--amazonec2-ssh-keypath ~/.ssh/id_rsa \
my_instance
Can't connect to it by ssh.
The my_key_pare is a name that exist on aws. The ~/.ssh/id_rsa is local ssh private key. How to set the right value?
I have read the document but didn't find an example of using both --amazonec2-keypair-name and --amazonec2-ssh-keypath.

Answer 1

Download the file from "Key Pairs" in AWS Console and place it in ~/.ssh.
Then run
docker-machine create \
-d amazonec2 \
--amazonec2-region ap-northeast-1 \
--amazonec2-zone a \
--amazonec2-ami ami-XXXXXX \
--amazonec2-ssh-keypath ~/.ssh/keypairfile \
my_instance

Answer 2

In gitlab-runner using Docker+machine, you have to provide both "amazonec2-keypair-name=XXX",
"amazonec2-ssh-keypath=XXX".
the Keypath should be like /home/gitlab-runner/.ssh/id_rsa and the path should also have id_rsa.pub file with id_rsa. These two file should not be your local generated key, should be the id_rsa, id_rsa.pub of Pem created
The following commands will do the trick,
cat faregate-test.pem > /home/gitlab-runner/.ssh/id_rsa
ssh-keygen -y -f faregate-test.pem > /home/gitlab-runner/.ssh/id_rsa.pub
And This will allow you to connect from runner manager instance to the runner provisioned by using your AWS existing keypair...