This page describes how to login to hosts that you have reserved through the GENI AM API.

Login to GENI hosts

When you reserve nodes through the [ ​http://groups.geni.net/geni/wiki/GeniApi GENI AM API], you can login to your nodes using ​`ssh`. You get access to reserved hosts only through ​ssh keys. This page will give you some useful tips about how to login to your nodes.

In order to login to your nodes you need the following things:

1. an ssh client
2. your login name, and the hostname
3. your ssh key

SSH Client

Depending on which OS you are using there are different ssh client options.

Linux/Mac OS

All linux and Mac distributions come with a built-in ssh client, just open a Terminal and type ssh, you should get the usage for the ssh command.

Windows OS

There are multiple windows ssh clients. A list of some popular ones can be found ​here. Some commonly used options are:

• ​Cygwin: a complete Linux-type environment that also includes an ssh client. If you have already installed cygwin on your host then you should just run it and follow the instructions for Linux for the rest of the instructions
• ​Putty: a lightweight free ssh client. Note: If you are using Putty you will also need to download puttygen to convert your private key to putty's format.

Get your Login and Host names

In order to figure out your login name the best way is to use the status command of the GENI AM API. Depending of which tool you used to reserve the resources you can get this information in different ways.

Using Flack

If you are using [​http://www.protogeni.netFlack for building your experiment then in order to get the login name you need to load your slice in Flack and press on the (i) icon that is next to the node. . On the top of the information window it has a field that says Username, and Hostname.

Using Omni

If you are using Omni, then you can run the sliverstatus command and get back a text output. If you search within that output you should find a field about the hostname and one about the login. If you are trying to ssh to your hosts from the same machine that you used to reserve your hosts then you can use a script that comes with Omni and you can directly skip to [ this section].

Other tools

If you used another tool to reserve your resources, then you should figure out how to get the output of the sliverstatus command. If you can't figure this out please send us an ​email and let us which tool you used to reserve your resources.

Get a copy of your ssh key

When you reserve your resources, the tool that you use for the reservation also installs one or more public keys on the hosts so that you can get ssh access to the compute resources. In order to ssh to the machines you will need to get a copy of the private ssh key that correspond to the installed public keys. As before how to get a copy of the needed ssh key depends on the specific tool.

Using Flack

Flack has a list of ssh keys that it uploads to nodes during the reservation. After you login to flack

Using Omni

Other tools

Omni Reserved Hosts

If you have reserved your nodes using ​Omni, you can use command-line ssh to login to your hosts. Omni comes with a script that will give you the exact ssh command you need to use to login to your nodes. To do this you need to be at the host that you used Omni to reserve your hosts and follow these steps:

• add omni to your PYTHONPATH
• run the script

Flack Reserved Hosts

Using other tools

Troubleshoot/Useful tips