kerzner
asked on
Java remote SSH
Hi, experts,
I need to execute Linux commands on a remote server (actually, EC2 machines) from my Java code. I found two libraries, sshj and jsch. Both are extensively used, but neither is extensively documented.
This is an example of using private/public key, but oh, so hard! http://stackoverflow.com/questions/3686710/sshj-example-of-private-public-key-authentication
Any help or explanation anywhere?
Thanks.
I need to execute Linux commands on a remote server (actually, EC2 machines) from my Java code. I found two libraries, sshj and jsch. Both are extensively used, but neither is extensively documented.
This is an example of using private/public key, but oh, so hard! http://stackoverflow.com/questions/3686710/sshj-example-of-private-public-key-authentication
Any help or explanation anywhere?
Thanks.
ASKER
Actually, this example is shorter, https://github.com/shikhar/sshj/blob/master/src/main/java/examples/Exec.java, which pushes me to use sshj, but even so - what does each call mean? And how do I make it use public/private keys?
Thank you,
Mark
Thank you,
Mark
shorter is not always the simpler
I just used the example in the link which I posted and executed command ps on my linux host from winodws.
I didn't do anything with public/private key
I just used the example in the link which I posted and executed command ps on my linux host from winodws.
I didn't do anything with public/private key
ASKER
Well, I have to use the keys - that's the only way to connect to EC2 machines. There are not username/passwords there. But you might be right, longer code, if it works, who cares. I might need to understand it, that's the problem :)
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there are many examples here - hopefully you can find something suitablefor your situation:
http://www.jcraft.com/jsch/examples/
http://www.jcraft.com/jsch/examples/
ASKER
Perhaps yes. I will try this one, http://www.jcraft.com/jsch/examples/UserAuthPubKey.java, and report the results
Sure, makes sense
Another thought - if you don't want the authentication process to happen from code , you can always manually configure passwordless ssh b/w the two machines
ASKER
Thanks, that's a good idea, but in my case I start and stop EC2 machines, and I also must allow login from Windows, so the pure java solution is preferable.
I'm not sure exactly what you're trying to do. If you're just trying to start and stop EC2 machines from a java program running on your desktop, you should use Amazon's Java SDK. The Javadoc is at http://docs.amazonwebservices.com/AWSJavaSDK/latest/javadoc/index.html.
Instructions are at http://docs.amazonwebservices.com/AWSSdkDocsJava/latest/DeveloperGuide/welcome.html?r=1075.
To start or stop an EC2 instance, use class AmazonEC2Client method startInstances. You pass the constructor for AmazonEC2Client your access key and secret key credentials in an AWSCredentials object and the SDK handles everything.
If this is not what you're trying to do, please ignore the post. Otherwise, if you have additional questions, please post.
Thanks,
Gary
Instructions are at http://docs.amazonwebservices.com/AWSSdkDocsJava/latest/DeveloperGuide/welcome.html?r=1075.
To start or stop an EC2 instance, use class AmazonEC2Client method startInstances. You pass the constructor for AmazonEC2Client your access key and secret key credentials in an AWSCredentials object and the SDK handles everything.
If this is not what you're trying to do, please ignore the post. Otherwise, if you have additional questions, please post.
Thanks,
Gary
PS Use AmazonEC2Client.runInstanc es (instead of startInstances) for instances not backed by EBS.
Gary
Gary
ASKER
Gary,
I already start and stop instances with Typica. Now I need to set the Hadoop cluster and run my jobs there.
Thank you
I already start and stop instances with Typica. Now I need to set the Hadoop cluster and run my jobs there.
Thank you
So, why not switch to the supported Amazon Java SDK for this and use AmazonElasticMapReduceClie nt.runJobF low?
Gary
Gary
ASKER
Because I am building my own AMI and running hadoop jobs on them. I need to many Linux utilities and other open source software that installing all these on each cluster machine on startup is not feasible. Here the project, http://freeeed.org/
http://www.jcraft.com/jsch/examples/Exec.java
using JSch:
http://www.jcraft.com/jsch/