i am encountering a weird issue when adding a new jenkins slave node.
the steps that i have done are as followed:
copied the public key from the master to the slave authorized_keys
checked that i can connect from the master to the slave to make sure it works
created keys on the slave and copied them to the new credentials.
getting the following error
picture of the error
further more, when i use the private key from the server to connect to it
ssh -i <path to private key> user#ip
gives me the same error
Permission denied (publickey).
but when i connect without the argument (with my public key) then it works.
regarding your step 3 - are you saying that you are saving the slave private key in jenkins credentials? It should be the master private key you should have in your jenkins credentials and use that to connect to your slave.
you have to trust the key, in jenkins you have to select manually trusted key while adding the private key, then below that you have to check the check box for trusting the key, after saving that you'll get on the option to trust the host's key in nodes dash board.
Related
I am stuck to configure publish over ssh in jenkins.
Jenkins container to ansible container in CLI I am able to do SSH via private key, but the same private key when I am using on publish over ssh it does not work.
jenkins.plugins.publish_over.BapPublisherException: Failed to connect
and initialize SSH connection. Message: [Failed to connect session for
config [ansible]. Message [USERAUTH fail]]
I solved this problem yesterday morning. In the ssh configuration file I added two lines, now working perfectly.
PubkeyAuthentication yes
PubkeyAcceptedKeyTypes=+ssh-rsa
I recently inherited a Jenkins instance running on an AWS EC2 server. It has several pipelines to different EC2 servers that are running successfully. I'm having trouble adding a new node to a new EC2 web server.
I have an account on that new web server named jenkins. I generated keys, added the ssh-rsa key to ~/.ssh/authorized_keys, and verified I was able to connect with the jenkins user via Putty.
In Jenkins, under Dashboard > Credentials > System > Global Credentials, I created new credentials as follows:
Username: jenkins
Private Key -> Enter Key Directly: Pasted in the key beginning with "BEGIN RSA PRIVATE KEY":
Finally, I created a new node using those credentials, to connect via SSH and use the "Known hosts file Verification Strategy."
Unfortunately, I'm getting the following error when I attempt to launch the agent:
[01/04/22 22:16:43] [SSH] WARNING: No entry currently exists in the
Known Hosts file for this host. Connections will be denied until this
new host and its associated key is added to the Known Hosts file. Key
exchange was not finished, connection is closed.
I verified I have the correct Host name configured in my node.
I don't know what I'm missing here, especially since I can connect via Putty.
Suggestions?
Have you added the new node to the known hosts file on the Controller node?
I assume Putty was your local machine rather than the controller?
See this support article for details
https://support.cloudbees.com/hc/en-us/articles/115000073552-Host-Key-Verification-for-SSH-Agents#knowhostsfileverificationstrategy
Sounds like your system doesn't allow for automatic hostkeys into the known_hosts file. You can check for the UpdateHostKeys flag in either your user, system, or potentially whatever user Jenkins runs under, SSH Config file. You can read more about the specific flag I'm talking about here.
If you need to add that hostkey manually, here's a nice write up for how to do it.
I'm trying to connect to Windows agent use SSh(Launch agent agents via SSH)
Jenkins master(in Linux)
log:
[SSH] Opening SSH connection to 192.168.0.122:22.
[SSH] SSH host key matches key seen previously for this host. Connection will be allowed.
ERROR: Server rejected the 1 private key(s) for my_bot (**********)
[SSH] Authentication failed.
Authentication failed.
Launch failed - cleaning up connection
[SSH] Connection closed.
I tried to add key to authorized_keys.. but it did not help
When ssh says "SSH host key" it means the keys in known_hosts.
Check .ssh/known_hosts to see that key.
Although "Connection will be allowed" implies this is not a problem for you.
So ignore that part of the error message.
Your real problem is "ERROR: Server rejected the 1 private key"...
Is they key exchanged ok?
Private key needs to be in jenkins. Also check file permissions.
Public key needs to be on server side. Probably .ssh/authorized_keys. Also check file permissions. Ssh will not allow keys to be used if permissions on .ssh or files contained inside are too open.
More information is needed to help solve the question:
In your question please show the ssh command you use - the full command - do you specify key with -i parameter ?
From jenkins command-line, can you ssh to the host using the same ssh command ?
Do ls -al on jenkins home .ssh dir and on server side .ssh dir to check permissions.
To get more verbose/debug information add -v or -vv or -vvv to your ssh command.
Also look at ssh logs on server side if possible.
In your question you could tidy up the log messages.
Same error seen on this question here and I can see they did chown 744 .ssh/authorized_keys in dockerfile which is the wrong way to set permissions for an authorized_keys file.
https://superuser.com/questions/1403715/why-i-am-getting-error-server-rejected-the-1-private-key-error-on-setting-up-s/1443503#1443503
I'm just starting out with jenkins and I'm having trouble to connect to a remote machine via rsync.
I guess jenkins doesn't know which ssh identity file to use or maybe it knows, but doesn't know how to decrypt it? From other questions i gathered that the Gtk-Warning is probably because it can't open the "enter keyphrase"-prompt.
rsync -azvh /var/lib/jenkins/workspace/ofen sascha#my_server:/my_project/ofen
No protocol specified
(ssh-askpass:19928): Gtk-WARNING **: cannot open display: :0
Host key verification failed.
rsync: connection unexpectedly closed (0 bytes received so far) [sender]
rsync error: unexplained error (code 255) at io.c(226) [sender=3.1.0]
Everything works fine when I try it from commandline.
Need to have the key loaded as part of Jenkin's SSH Agent configuration.
Add the private key to Jenkins via credentials/SSH private key including pass phrase if one is used
Enable SSH agent on the job and give it the credential
Things that use SSH keys and agents can now use the loaded key.
The "identity" depends on where your job is running:
when running on the master, it's the user that runs Jenkins
on a slave, it's the user that you use for connecting the slave
You need to add the public key of that identity to the .ssh/authorized_keys file of user sascha. This will enable public key-based authentication and rsync should run just fine.
I get Host key verification failed error whenever I try to put my GITLAB git address into Jenkins.
I've tried:
- using multiple different SSH paths. Including removing : and replacing /. Used http
- I've ssh and tried to run the command in the terminal, when prompted to say y/n I pressed Y.
- It works with Github.
- I've tried going to my jenkins/.ssh/ida_pub and adding my keys.
Failed to connect to repository : Command "/usr/local/git/bin/git ls-remote -h git#:/.git HEAD" returned status code 128:
stdout:
stderr: Host key verification failed.
fatal: Could not read from remote repository.
Please make sure you have the correct access rights
and the repository exists.
If you make the repo you are trying to connect to public in Gitlab (Settings -> Edit Project -> Public mode) you should be able to connect using http (but only http).
If the repo is not public you will need to install an SSH key on Jenkins that has permissions to access the repo. My understanding is that the Jenkins git plugin does not currently use the SSH credentials already stored in Jenkins so you will need to install the key on the master and slaves that will run this build. How you do this will depend on your OS but I find it easiest to use an SSH config file on Linux.