How to resolve this error Jenkins Host key verification failed

Question

I’m facing a problem with Jenkins while setting "git". I get the following error:

Failed to connect to repository : Command "git ls-remote -h http://github/someone/gittest.git HEAD" 
stderr: fatal: Authentication failed

Answer 1

This is quite simple, so first you have to change to the Jenkins user and execute the following command :

git ls-remote -h ‘repo URL’ HEAD

After this, you will get a SSH warning. This happens when you first connect to a new host via SSH:

The authenticity of host 'github/someone/git.git' can't be established.
Are you sure you want to continue connecting (yes/no)?

Type yes and press Enter. The host key will be added to the ~/.ssh/known_hosts file and you won't face this error henceforth.

Comments

It shows permission denied.

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Add your public key to the repository at bitbucket.org

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issue is with the /var/lib/jenkins/.ssh/known_hosts. It exists in the first case, but not in the second one. This means you are running either on different system or the second case is somehow jailed in chroot or by other means separated from the rest of the filesystem (this is a good idea for running random code from jenkins).

Next steps are finding out how are the chroots for this user created and modify the known hosts inside this chroot. Or just go other ways of ignoring known hosts, such as ssh-keyscan, StrictHostKeyChecking=no or so.

Answer 2

1)Execute following commands on terminal 

  $ sudo su -s /bin/bash jenkins

provide password

2)Generate public private key using the following command:

$ ssh-keygen

you can see output as ::

Generating public/private rsa key pair. 
Enter file in which to save the key (/var/lib/jenkins/.ssh/id_rsa): 
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 

3)Press Enter --> Do not give any passphrase--> press enter 

  Key has been generated

4) go to --> cat /var/lib/jenkins/.ssh/id_rsa.pub

5) Copy key from id_rsa.pub

6)Exit from bash

7) ssh@yourrepository

8) vi .ssh/authorized_keys

9) Paste the key

10) exit

11)Manually login to mercurial server

12)once manually done, Now go to Jenkins and give build

Answer 3

I had the same problem. Try this, it worked for me:

reset permission on id_rsa* only for current user no group no other

chmod o-rwx ~/.ssh/id*
chmod G-rwx ~/.ssh/id*
ls -lart ~/.ssh/
-rw-------  1 jenkins nogroup  398 avril  3 09:34 id_rsa.pub
-rw-------  1 jenkins nogroup 1675 avril  3 09:34 id_rsa
And clear ~/.ssh/know_hosts

Now Connect as jenkins

sudo su jenkins

Try the jenkins commands

git ls-remote -h git@bitbucket.org:user/project.git HEAD

Answer 4

Set git path to your git executable

Manage Jenkins => Configure System => Git => Git Installations => Path to Git executable.

Comments

How do I get the git executable path?

Answer 5

HI Mam,

Please check the following solution::

1. Switch to jenkins user (sudo -iu jenkins)

2. Run: ssh-keygen (Note - You are creating ssh key pairs for jenkins user now. You should see something like this : Enter file in which to save the key (/Users/Shared/Jenkins/.ssh/id_rsa):

3. Keep pressing Enter for default value till end

4. Run the command showing in the Jenkins error message, on your terminal (eg : "git ls-remote -h git@github.com:adolfosrs/jenkins-test.git HEAD")

5. You will be asked if you want to continue. Say yes

6. The Github repo will be added to your known_hosts file in : /Users/Shared/Jenkins/.ssh/

7. Go back to Jenkins portal and try your Github SSH url

It should work. Good Luck

Comments

Thanks a lot for such a nice explanation! I'll upvote your answer :)