mum@bb-l-m-gd-200 ~/projects/repo$ docker exec -ti jenkins /bin/bash
jenkins@46e0509ddfae:/$ 
jenkins@46e0509ddfae:/$ hostname 
46e0509ddfae
jenkins@46e0509ddfae:/$ 
jenkins@46e0509ddfae:/$ 
jenkins@46e0509ddfae:/$ ssh-keygen 
Generating public/private rsa key pair.
Enter file in which to save the key (/var/jenkins_home/.ssh/id_rsa): 
Created directory '/var/jenkins_home/.ssh'.
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /var/jenkins_home/.ssh/id_rsa.
Your public key has been saved in /var/jenkins_home/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:CwsvRfnMie4wfj2b/o705+XJrPpVykY39l/3CcLBn3g jenkins@46e0509ddfae
The key's randomart image is:
+---[RSA 2048]----+
|                 |
|       .         |
|      o          |
|     . = ..      |
|    . + S  o  .oo|
|     = o .. +oo+o|
|    + +.o  + E* +|
|   . =..o+  +B..*|
|    ....====+.=.o|
+----[SHA256]-----+
jenkins@46e0509ddfae:/$ 
jenkins@46e0509ddfae:/$ ssh-copy-id 10.10.0.6
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/var/jenkins_home/.ssh/id_rsa.pub"
The authenticity of host '10.10.0.6 (10.10.0.6)' can't be established.
ECDSA key fingerprint is SHA256:1ZZ+BrXKS7IGTYM+De6Fulq1LK3CIMRhxZmhmB+WrWE.
Are you sure you want to continue connecting (yes/no)? yes
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
Password:

Number of key(s) added: 1

Now try logging into the machine, with:   "ssh '10.10.0.6'"
and check to make sure that only the key(s) you wanted were added.

jenkins@46e0509ddfae:/$ 
jenkins@46e0509ddfae:/$ ssh 10.10.0.6
Password:
Last login: Thu Aug 29 18:46:15 2019 from 10.10.0.6
bb-l-m-gd-200:~ jenkins$ 
bb-l-m-gd-200:~ jenkins$ hostname 
bb-l-m-gd-200
bb-l-m-gd-200:~ jenkins$ 
bb-l-m-gd-200:~ jenkins$ cat /private/etc/ssh/sshd_config|grep  PubkeyAuthentication
PubkeyAuthentication yes
bb-l-m-gd-200:~ jenkins$ 
bb-l-m-gd-200:~ jenkins$ ls -l ~/.ssh/authorized_keys 
-rw-------  1 jenkins  staff  804 Aug 29 18:48 /Users/gdajuk/projects/repo/.ssh/authorized_keys
bb-l-m-gd-200:~ jenkins$ 
bb-l-m-gd-200:~ jenkins$ logout
Connection to 10.10.0.6 closed.
jenkins@46e0509ddfae:/$ exit
mum@bb-l-m-gd-200 ~/projects/repo$