...
This is a series of exercises that will walk you through the basic tasks as you get on board the Atos HPCF or ECS computing platforms.
| Table of Contents |
|---|
Prerequisites
In order to follow this tutorial, these are the prerequisites you must fulfil before starting:
- You must have a valid ECMWF account with privileges to access HPCF or ECS. If you only have access to ECS, you may need to skip certain exercises involving HPCF.
- You must have 2 Factor Authentication enabled with TOTP.
- You must be able to connect with at least one of the following methods:
- Using the Virtual Desktop Infrastructure (VDI). See the corresponding documentation to get started.
- Using Teleport SSH from your end user device own computer.
Logging into Atos HPCF and ECS
| Info |
|---|
You can either use Teleport or VDI for the following exercises. |
First steps into Atos HPCF and ECS
| Info | ||
|---|---|---|
| ||
First of all, let's try to connect to the computing services via SSH:
Access the default login node of the ATOS HPCF or ECS and take note of what node you are in
...
| title | Solution - HPCF |
|---|
| No Format |
|---|
ssh hpc-login
hostname |
...
| title | Solution - ECS |
|---|
| No Format |
|---|
ssh ecs-login
hostname |
Open a new tab in your terminal and connect again. Did you get the same hostname? Why is that?
| Expand | ||
|---|---|---|
| ||
Both aliases will always point to a working login node, and the actual node and complex behind it may change depending on the load, system sessions or outages. |
| Children Display | ||||
|---|---|---|---|---|
|
| HTML |
|---|
<style>
div#content h2 a::after {
content: " - [read more]";
}
</style> |
Now, from your open SSH session on Atos HPCF or ECS, connect to the main login alias again. Did it ask for a password? Can you set your account up so jumps between hosts are done without a password?
...
| title | Answer |
|---|
Password-less SSH between ECMWF hosts such as Atos HPCF or ECS nodes, or VDI hosts is not set up by default. If you were asked for a password, you can run the following command from your Atos HPCF, ECS or VDI session to set up key-based authentication:
| No Format |
|---|
ssh-key-setup |
After this you should be able to jump between hosts without having to introduce your password.
...