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iridium_cluster:testnodes
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Iridium Cluster Testing nodes
The cluster has two testing nodes accessible from anywhere that should be used for testing your code.
| hostname | purpose |
|---|---|
nptest-iridium.lunarc.lu.se | test node for nuclear physics |
pptest-iridium.lunarc.lu.se | test node for particle physics |
They will also be used from time to time to host courses.
They are meant for interactive access to the cluster, as opposed to the arc-iridium grid frontend that can be used for batch submission of jobs
===== Accessing the Testing nodes
User groups
Three main UNIX user groups are defined, as follows:
| User group | Who belongs to it | Group hierarchy |
|---|---|---|
| npusers | Researchers belonging to Nuclear Physics | primary |
| ppusers | Researchers belonging to Particle Physics | primary |
| clusterusers | All users accessing the cluster | secondary |
Group hierarchy tells how your files are created. Whenever you create a file, its default ownership will be:
- user: your username
- group: group you belong
Accessing Testing nodes
As said, currently access to nodes must happen via special machines.
A typical access routine is the following:
- Access the special machines for your division.
- login to the iridium access gateway
- login to one of the nodes you are assigned to
- setup the work environment
Let's see those in details.
1) Access the special machines for your division.
Particle Physics
simply run:
ssh <username>@tjatte.hep.lu.se
where <username> is the same used to login to teddi or to your own laptop.
Nuclear Physics
coming soon
2) login to the iridium access gateway
simply run:
ssh <username>@iridium.lunarc.lu.se
where <username> is the your username on the cluster as given by the administrators.
You will be accessing a special shell in which you'll see which node you are assigned to. Assigned nodes can also be seen in Assigned Nodes
for Particle Physicists, the username is the same used to login to teddi or to your own laptop.
3) login to one of the nodes you are assigned to
simply run:
ssh <username>@nX
where
<username>is the your username on the cluster as given by the administrators.- X is one of the node you're assigned in Assigned Nodes
NOTE : There is no checking upon login. you can login into a node that is not assigned to you. PLEASE DON'T DO. Please check. Security enforcement can be done but is not the purpose of this testing phase. If you encounter issues, we will be able to reduce access accordingly.
4) setup the work environment
Administrators provided scripts for quick setup of your work enviroment.
Just execute the command in the column Script to run at the shell prompt, or add it to your .bashrc or .bash_profile file so that is executed every time you login.
The following are active now:
| Environment | Script to run | Description |
|---|---|---|
| ATLAS Experiment environment | setupATLAS | Will setup all the neeeded environment variables for ATLAS experiment, and present a selection of other environments that the user can setup. |
iridium_cluster/testnodes.1395428172.txt.gz · Last modified: 2014/03/21 18:56 by florido
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