Section V: Testing certificate (after VO-Registration has been completed) | University of Tübingen

Section V: Testing certificate (after VO-Registration has been completed)

When your VO registration has been completed and has been spread among the Grid (after receiving the conformation mail this will take about one more day) you can verify if the certificate is installed correctly with the following procedure.
To enable the globus system (required to work with bwGRiD) you have to activate the Globus commands by loading the corresponding software module:
```
module load globus
```
The module command is described in greater detail here.
Now you may generate a temporary certificate (commonly refered to as proxy certificate). This proxy certificate is required to authenticate you with the Grid system. Its validity period is confined to 12 hours. It should also be mentioned that each temporary certificate will only work on the same computer it was created on.
```
grid-proxy-init -debug -verify
```

Useful information about your current proxy certificate is provided by the command:
```
grid-proxy-info
```

Finally by entering command
```
gsissh -p 2222 gt4.uni-tuebingen.de
```
you can access gt4 without any username or password. If you are asked for a username or password, something went wrong. Since the grid system in Ulm is to date quite experimental, the koios server may be down from time to time. If you can not establish a connection to koios in Ulm please try to use a server in Stuttgart with:
```
gsissh -p 2222 gridway.dgrid.hlrs.de
```

To test if the globus system actually works you may now start a job issuing the following command (when you are logged into a globus server):
```
globusrun-ws -submit -s -Ft PBS -c /bin/hostname
```
You do not have to use the globus commands to submit a job. You can also directly create PBS scripts and submit them via the 'qsub' command. Details for working with the batch system on different sites in the bwGRiD are shown at login or you can check them on the web page.
Using GSI-OpenSSH commands:
You can upload files to our Globus server via command:
```
gsiscp -P 2222 my-local-file gt4.uni-tuebingen.de: 
```
To download a file from a remote Globus server to your local disk, please use a command like:
```
gsiscp -P 2222 gt4.uni-tuebingen.de:my-remote-file ./
```
Please note that the port specification -P uses a capital 'P'. In contrast to this, the gsissh command uses a lowercase 'p'.
Please note that if you are a local user you will be mapped to your normal home directory when logging onto the GT4-Server as hpc-bw because GT4 has access to the same file system.

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