[jenkins] Jenkins Host key verification failed

I have a problem with jenkins, setting "git", shows the following error:

Failed to connect to repository : Command "git ls-remote -h https://[email protected]/person/projectmarket.git HEAD" returned status code 128:
stdout:
stderr: fatal: Authentication failed

I have tested with ssh:

[email protected]:person/projectmarket.git

This is error:

Failed to connect to repository : Command "git ls-remote -h [email protected]:person/projectmarket.git HEAD" returned status code 128:
stdout:
stderr: Host key verification failed.
fatal: The remote end hung up unexpectedly

I've also done these steps with "SSH key".

Login under Jenkins

sudo su jenkins

Copy your github key to Jenkins .ssh folder

cp ~/.ssh/id_rsa_github* /var/lib/jenkins/.ssh/

Rename the keys

mv id_rsa_github id_rsa
mv id_rsa_github.pub id_rsa.pub

but still not working git repository in jenkins.

thanks by help!.

Try

ssh-keygen -R hostname

-R hostname Removes all keys belonging to hostname from a known_hosts file. This option is useful to delete hashed hosts

Jenkins is a service account, it doesn't have a shell by design. It is generally accepted that service accounts. shouldn't be able to log in interactively.

To resolve "Jenkins Host key verification failed", do the following steps. I have used mercurial with jenkins.

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

Note: Pls do manually login otherwise jenkins will again give error "host verification failed"

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

Enjoy!!!

Good Luck

• Make sure we are not editing any of the default sshd_config properties to skip the error

• Host Verification Failed - Definitely a missing entry of hostname in known_hosts file

• Login to the server where the process is failing and do the following:

  1. Sudo to the user running the process

  2. ssh-copy-id destinationuser@destinationhostname

  3. It will prompt like this for the first time, say yes and it will also ask password for the first time:

     The authenticity of host 'sample.org (205.214.640.91)' can't be established.
     RSA key fingerprint is 97:8c:1b:f2:6f:14:6b:5c:3b:ec:aa:46:46:74:7c:40.
     Are you sure you want to continue connecting (yes/no)? *yes*
     

     Password prompt ? give password

  4. Now from the server where process is running, do ssh destinationuser@destinationhostname. It should login without a password.

     Note: Do not change the default permissions of files in the user's .ssh directory, you will end up with different issues

Best way you can just use your "git url" in 'https" URL format in the Jenkinsfile or wherever you want.

git url: 'https://github.com/jglick/simple-maven-project-with-tests.git'

Copy host keys from both bitbucket and github:

ssh root@deployserver 'echo "$(ssh-keyscan -t rsa,dsa bitbucket.org)" >> /root/.ssh/known_hosts'
ssh root@deployserver 'echo "$(ssh-keyscan -t rsa,dsa github.com)" >> /root/.ssh/known_hosts'

1. login as jenkins using: "sudo su -s /bin/bash jenkins"
2. git clone the desired repo which causes the key error
3. it will ask you to add the key by showing Yes/No (enter yes or y)

that's it!

you can now re-run the jenkins job.

I hope you this will fix your issue.

SSH

If you are trying it with SSH, then the Host key Verification error can come due to several reasons.Follow these steps to overcome all the reasons.

1. Set the Environment variable as HOME and provide the address as the root directory of .ssh folder. e.g:- If your .ssh is kept inside Name folder. C:/Users/Name.
2. Now make sure that the public SSH key is being provided in the repository link also. Either it is github or bitbucket or any other.
3. Open git bash. And try cloning the project from the repository. This will help in adding your repository URL in the known_host file, which is being auto created in the .ssh folder.
4. Now open jenkins and create a new job. Then click on configure.
5. provide the cloning URL in Source code management under Git. The URL should be start with [email protected]/......... or ssh://proje........
6. Under the Credential you need to add the username and password of your repository form which you are cloning the project. Select that credential.
7. And now apply and save the configuration.
8. Bingo! Start building the project. I hope now you will not get any Host Key verification error!

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.

using https://bitbucket.org/YYYY/XX.git

you shoud delete username@

I ran into this issue and it turned out the problem was that the jenkins service wasn't being run as the jenkins user. So running the commands as the jenkins user worked just fine.

Or you can use:

ssh -oStrictHostKeyChecking=no host

This will be insecure (man in the middle attacks) but easiest solution.

The better way to do that is to generate correct mappings between host and ip address, so ssh will not complain:

#!/bin/bash

for domain in "github.com" "bitbucket.org"; do
    sed -i "/$domain/d" ~/.ssh/known_hosts
    line=$(ssh-keyscan $domain,`nslookup $domain | awk '/^Address: / { print $2 ; exit }'`)
    echo $line >> ~/.ssh/known_hosts
done

Excerpt from gist.

As for the workaround (e.g. Windows slave), define the following environment variable in global properties:

GIT_SSH_COMMAND="ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no"

Note: If you don't see the option, you probably need EnvInject plugin for it.

Had same problem, i fix it like that :

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 [email protected]:user/project.git HEAD

If no problem appears, now jenkins will be able to connect the repo (for me ^^ at least)