Joining the Grid Andrew Mc Nab Outline

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Joining the Grid Andrew Mc. Nab

Outline ● ● 28 March 2006 LCG – the grid you're joining Related projects Getting a certificate – Care of your certificate Joining a Virtual Organisation – AUP Andrew Mc. Nab – Joining the Grid

LCG • The LHC Computing Grid (LCG) – http: //www. cern. ch/LCG/ – The worldwide computing infrastructure for LHC – Led by CERN – Majority of resources are at the other sites • Has more than 100 fully operational sites, in 31 countries – About 190 are operational at some level – Sites from US to Japan, but mostly in Europe 28 March 2006 Andrew Mc. Nab – Joining the Grid

LCG: World 28 March 2006 Andrew Mc. Nab – Joining the Grid

LCG: Europe 28 March 2006 Andrew Mc. Nab – Joining the Grid

LCG: by region 28 March 2006 Andrew Mc. Nab – Joining the Grid

Related projects • EGEE is also led by CERN – Develops software to be adopted by LCG – EU-funded, and intended to get non-HEP on board • Grid. PP is the PPARC-funded UK HEP grid project – Runs LCG in the UK – Contributes effort to EGEE • The National Grid Service (NGS): non-HEP UK grid – Increasingly adopting ideas/software from LCG • Open Science Grid (OSG): the US Do. E/NSF grid – Increasingly interoperates with LCG 28 March 2006 Andrew Mc. Nab – Joining the Grid

Getting a cert • All authentication on LCG is done by X. 509 digital certificates – these contain a unique name for each user – “/C=UK/O=e. Science/OU=Manchester/L=HEP/CN=andrew mcnab” • To use LCG you need to get a certificate • This requires proving who you are with photo ID • For the UK Certification Authority, you start this via their website – https: //ca. grid-support. ac. uk/ 28 March 2006 Andrew Mc. Nab – Joining the Grid

Requesting the cert 28 March 2006 Andrew Mc. Nab – Joining the Grid

Certificate process • Apply for the certificate on the CA website – Choose the right Registration Authority (RA) – “Manchester HEP” in our case • Go to the RA operator (Sabah in our case) and provide your photo ID • You receive an email from the CA when your certificate is ready (a day or so – the signing machine is offline) • You can then load it into your web browser from the CA website 28 March 2006 Andrew Mc. Nab – Joining the Grid

Care of your cert ● ● Applying for the certificate has created a secret Private Key (a huge number) and a Public Key (another huge number) which the CA has turned into a certificate These are inside your web browser at the end of the process Any body with access to your web browser or the Private Key can pretend to be you – so treat it like a password There are instructions on the CA website for getting your certificate and private key out the browser, and into the file used by the Grid command line tools 28 March 2006 Andrew Mc. Nab – Joining the Grid

Virtual Organisations ● ● Your certificate proves who you are, but doesn't give you access to any sites To get that, you need to join a Virtual Organisation (VO), like ATLAS or Ba. Bar Use the “User Registration” link from http: //www. cern. ch/LCG/ and follow the instructions Different VOs have slightly different procedures – it always involves associating your certificate with your request to join – then a manager of the VO decides if you really are a bona fide member of that collaboration 28 March 2006 Andrew Mc. Nab – Joining the Grid

AUP ● ● ● Joining a VO requires accepting the LCG Acceptable Usage Policy This is a common AUP accepted by all LCG sites – Avoids the need to fax off 190 different Computer Centre forms when you join The AUP is very short – less than a page – and pretty innocuous – basically: “Don't abuse the sites” and “You're legally responsible for what you do. ” – In return, you get access to a huge amount of CPU, with local accounts created for you on demand 28 March 2006 Andrew Mc. Nab – Joining the Grid

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