将ssh私钥添加到docker

Question

I am trying to add my ssh private key to docker, my Dockerfile is as follows:

ARG key
RUN echo $key > panaxea-key

RUN chmod 600 panaxea-key
RUN eval $(ssh-agent -s) && ssh-add panaxea-key

Console output:

Step 10/14 : RUN echo $key > panaxea-key
 ---> Using cache
 ---> 8ee023dba45e
Step 11/14 : RUN chmod 600 panaxea-key
 ---> Using cache
 ---> b7c42a9c5268
Step 12/14 : RUN eval $(ssh-agent -s) && ssh-add panaxea-key
 ---> Running in 9895e087cea5
Agent pid 9
Enter passphrase for panaxea-key: The command '/bin/sh -c eval $(ssh-agent -s) && ssh-add panaxea-key' returned a non-zero code: 1
dario@dario-X750JB:~/Panaxea_Docker$ 

Any advice? My key doesn't have a passphrase

Answer 1

If your key doesn't have a passphrase and ssh-add is asking you for one, it means ssh-add could not understand your key file. The culprit is echo $key > panaxea-key . You'll see that the file is a single line of text now and all the newlines have disappeared.

Use echo "$key" > panaxea-key instead.

This should get it to work, but the warnings about embedding a private key inside a docker image still stand. How you get around that depends on exactly what you're trying to accomplish, but I feel like that's a different question altogether.