How to Setup Linux Master Slave Agent in Jenkins with SSH-KEY ?| EP 05 | Common Mistakes by Engineer
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- Опубліковано 15 жов 2024
- Install Java on #master node.
Install #jenkins on master node.
Install #java on slave node.
Create a user and ssh keys on #slave node.
Copy #keys on master node.
Join slave node to master.
Test the setup.
Steps to Configure Jenkins #master and #slave Nodes :
Click on Manage Jenkins in the left corner on the Jenkins #dashboard
Click on Manage Nodes
Select New #node and enter the name of the node in the Node Name field.
Select Permanent Agent and click the OK button. Initially, you will get only one option, "Permanent Agent." Once you have one or more slaves you will get the "Copy Existing Node" option
Enter the Hostname in the Host field.
Select the Add button to add credentials. and click Jenkins.
Do ssh key setup as shown in video
Select the dropdown menu to add credentials in the #credentials field.
Select the next dropdown to add the Host Key #verification Strategy under Non verifying Verification Strategy.
Select Keep this agent online as much as possible in the #availability field.
Click the Save button.
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You really helped me when you found the hostname and the correct username, I should've come to this video 12 hours earlier! Thank's man
Glad it helped, stay connected and keep learning
I have gone through many videos and wasted lot of my time. But this video helped me a lot in understanding the concept. A huge thanks.......!!!!!!!
Glad it helped,
Spent ages trying to get this to work, this tutorial has everything needed +1
Thank you
Thank you! For those who are having trouble connecting, please ensure that you are creating the files and folders under the correct user (root) and not the default 'home' user."
Thanks for the suggestion.
This will help the viewers.
Thanks a ton bro ! Finally after wasting so many hours on youtube... this worked for me ! ❤
Glad it helped. Stay connected and keep learning
found this solution after 2 months, thank you
Glad it helped.
Jenkins is one of the most counter intuitive things out there when it comes to simple things like adding nodes or upgrading. It should not be this cumbersome.
yes, Very True. but mostly it will be like one time setup/pain.
Thanks brother... explained in very simple way... I really apricated Thanks.
Thanks, Glad it was helpful..
Vijay, this is really helpful, but I noticed only you are replying who said good, but I didn't seen any reply who are asking any doubts of error as commented
Thanks sandeep for feedback.
For errors, mostly i see the error code.
Without background scenario i can't answer exactly.
I try answering for some generic errors and question,
Thanks.
After going through alot of video for agent setup, finally this one helped.
Noone shows the authentication failed issue. Finally got to know how this is resolved.
Thank you!
Can you also make a video for setting up agent in windows?
Glad i could help @aishwarya!!!..
i have created video for slave agent setup in windows also.
ua-cam.com/video/VwliiaOI5po/v-deo.html
Keep learning with me .Stay connected with my channel :) . Do subscribe the channel for more updates : )
#devopsvijay
Thanks for the video bro. The logs says agent is missing java installation? is it mentioned in the video?
java is must for jenkins and it's agent to work. that is mandatory requirement for jenkins.
i have covered that part in jenkins introduction video.
Sir I have a doubt, I have created a master and slave machines with a passwordless authentication. I copied the ssh-key generated(tpublic) on the master machine to both of the slave machines(.ssh/authorized_keys). Now when i launch nodes for both the machines, it rejecting the private key. can i generate a ssh key in slave machine and use the private rsa keys to authenticate for nodes?
Yes you can use ssh key generated on slave box also
May you can increase the font size.. not sure if okay my feedback :)
Yes, Thanks alot for your feedback, i have noted it down.
Nice and grisp, and much needed one. Many skip this part
Glad it helped
When i install Jenkins on ec2, im getting only 2 options in launch method. Only first and third option, middle one is not coming, whats the reason
Awesome Vijay.
can we connect for a quick question?
Thanks
you can put your question in comments
ERROR: Server rejected the 1 private key(s) for ec2-user (credentialId:jenkins-slave/method:publickey)
authentication failed
what should i have to do ? bro
Thanks for pasting the error.
Check the comments history, you will find the solution i had pasted sometime back.
In Windows, jenkins has private key of linux copied. But it doesnt have the public key of linux. How does the communication established between. I was just wondering about it. Thanks if you could help me out.
In windows you can use jnlp method to connect windows agent.
Thank you so much. My issue got resolved.🎉
Glad , it was helpful
In my screen, there is NO Authorized keys, icant copy paste public key.. please clear
Thanks Vijay you save job🙏
Is it possible to run build on same server or system when we create slave naming other systems
My target is to build 6 jobs parallelly containing same code but with different parameter change. how can i achieve this?
Great explaination
Thanks.
Hello Viay.Thanks for your vidoe .Can you please help me to fix this issue i am getting this issue SSH Connection failed with IOException Key exchange was not finished connection is closed retrying in 15 seconds There are 5 more retries left
Please go over the previous comments,
I had mentioned couple of resolution to solve this issue.
Might be helpful for u.
Thanks
Thanks ! my jenkins are running Centos and I am connecting agent as Ubuntu22.4.
1.Creating SSH key on agent Ubuntu machine. 2. using id_rsa as private during node creation 3. copy id_rsa_pub into authorized key file in same machine
ERROR: Server rejected the 1 private key(s) for ubuntu (credentialId:devopstest/method:publickey)
Couple of things might go wrong in this rejection
Extra space while pasting private key in jenkins creds
Private key file and authorized key file permission
Make sure these 2 files are kept under correct user and correct location.
And i see file name which u pastes is id_rsa_pub i believe dot should be there like id_rsa.pub
😢not working .... In authorized key folder I already have public key but not private key so I copied private key into that directory still not working and before it I tried many times still not working
You can create new private and public key using ssh-keygen command.
You should always use it in pair.
@@devopsvijay ok thank you
Really nice and easy steps you describes thanks
Glad it helped. Like subscribe and share for much videos. Thanks
hi , i am using mac os and in terminal in created ssh keys using ssh-keygen i am getting only 2 files , i am not getting authorized_keys file idk why any. one help ?
Authorized_keys will not get generated automatically.
You have to create manually.
jenkins node connection error : Agent JVM has terminated. Exit code=1 Launch failed - cleaning up connection [SSH] Connection closed
Thank you Vijay.
please Like and subscribe for more devops related videos
hi vijay, please make a video of connecting ssh to linux server for command execution from windows jenkins server as a domain user
please check this
Thanks @varunbc for suggestion.
Noted it .
good information broo..very helpful keep going
Thank you so much 🙂
how to deploy war file from jenkins on windows to linux agent on tomcat conatiner?
Once linux agent is connected as slave.
The deploying war file in tomcat process is same for windows and linux.
Take a look at this video, might be helpful
ua-cam.com/video/fuelx5j1HA8/v-deo.html
Thanks for the info. Very helpful
Glad it was helpful!
Thank you for the detailed information. The issue got resolved. Thank you
Glad it helped
Please Like share & subscribe . Stay connected and keep learning
i follow what you done still i have error my slave cannot connect becoz of the private key i put in there in credential is not recognize hahiast
Might be there is some extra line at the end.
How you are taking root remote directory and why your taking it?
Remote root directory is nothing but working directory for an agent.
You can select any directory. Which has access to jenkins agent
Nice and simple.. great work.
Can you plan some session on ssh also!!
Yes for sure
@sadanand Created video on ssh ua-cam.com/video/1_v7NXaDYkw/v-deo.html
Take a look. Feedback would be appreciated
It showing 'ssh connection failed with Ioexception;' why bro?
Great demo but after going through the exact steps I still have this error (i'm on rhel 8)......[10/06/23 12:12:26] [SSH] Opening SSH connection to 10.xx.xxx.163:22.
[10/06/23 12:12:26] [SSH] SSH host key matched the key required for this connection. Connection will be allowed.
ERROR: Server rejected the 1 private key(s) for jenkins (credentialId:SSH_CONNECT_AGENT/method:publickey)
[10/06/23 12:12:26] [SSH] Authentication failed.
Authentication failed.
[10/06/23 12:12:26] Launch failed - cleaning up connection
[10/06/23 12:12:26] [SSH] Connection closed.
There could be couple of reason of authentication failed.
1 . Make sure chmod permission of authorized_keys is correct. Where you have pasted public key.
2. Private key present in jenkins. There should be no extra line while pasting.
excelent guide. Thanks
Haapy to help
Hi vijay .... I do same in all steps in practical session the error will occurs authentication failed . i do same all steps by in your video same process
you might be missing some steps like:
Couple of things might go wrong in this rejection
Extra space while pasting private key in jenkins creds
Private key file and authorized key file permission
Make sure these 2 files are kept under correct user and correct location.
mine is always showing offline how do i sort it out
paste the error in comment, which you might be getting
Thank you you are amazing. It worked
Glad it helped.
getting this error
No Known Hosts file was found at /var/lib/jenkins/.ssh/known_hosts. Please ensure one is created at this path and that Jenkins can read it.
There might be a permission issue on your server due to which it is not able to create those files automatically.
You can create manually and give proper permission to file and folder and see if that works.
Thanks for sharing
Thanks for watching! Please like and subscribe and stay connected for more such videos.
Very helpful bro thanks
Happy to help
Hi bro getting error after following the same steps can you please help me out
can you please paste the error, i will try to check.
Sorry for the late reply
not connected with my jenkins and followd your said steps
Can you please provide the complete error for analysis, so that i can go through and try answering it.
If you are still facing issue, sorry for the delay in reply
Mate, why are you using private IP as hostname ?
Because i have complete setup inside same vpc.
You can use any ip. Only thing that's needed connectivity on port 22
Host name didn't worked for me i tried using the public ip it connected
Please paste the error. I will try to check
hello , my doubt is , generated ssh keys in agent server and add private key in jenkins , but where to add public ? in master server or agent server? anyone please give reponse
Agent server.
@@devopsvijay bro then how to ssh between master and slave? we need to create public and private key on maste? then paste public key on slave,paste private key on jenkin's console right?
Hi Sir How to solve mulitiple SSH private key to Jenkins? If i have multiple server.?
You can do it using manage jenkins and then credentials
Thanks bro
Bro, connection failed ....after trying many times...
Please paste the error in comment i will try to help
There could be couple of reason of authentication failed.
1 . Make sure chmod permission of authorized_keys is correct. Where you have pasted public key.
2. Private key present in jenkins. There should be no extra line while pasting.
Thank you
Happy to help
is it on gcp ?
No, aws
Authentication failed
bhai in ~/.ssh/ i am not getting authorized_key file
Authentication failed after trying many times
Please paste the error in comment . I will look into that and try to help.
There could be couple of reason of authentication failed.
1 . Make sure chmod permission of authorized_keys is correct. Where you have pasted public key.
2. Private key present in jenkins. There should be no extra line while pasting.
My side not any authorisation key file
@@devopsvijay how to make authorisation key file
@@DeviL-yw6ud use ssh-keygen command in linux to create authorisation private and public key file.
and for authorized_keys file Fire command
touch authorized_keys inside .ssh folder
make sure to follow these permission to files:
.ssh directory: 700 (drwx------)
public key (.pub file): 644 (-rw-r--r--)
private key (id_rsa): 600 (-rw-------)
chmod 644 /home/$USER/.ssh/authorized_keys
dosent work