Storage Manager

See also: Storage overview | Storage Manager | Group Storage | Ceph | Local (on nodes) disks reservation

	Note
	This page is actively maintained by the Grid'5000 team. If you encounter problems, please report them (see the Support page). Additionally, as it is a wiki page, you are free to make minor corrections yourself if needed. If you would like to suggest a more fundamental change, please contact the Grid'5000 team.

The Storage Manager manages access to NFS shares (in particular, users' home directories) on Grid'5000.

This page describes its API, and focuses on accessing user's home directories.

How it works

The storage API works with access object. An access is defined by a list of addresses and a termination condition for a specific location on an NFS Server. Each user's home directory is located on /export/home/username on the NFS server of each site: nfs.site.grid5000.fr

Each time you start a job, an access to your local home directory is automatically created for all the assigned nodes. You may want to use this page if you want to allow additional addresses to access your home (like when you are using VLAN) or if you want to access your home over-site. You will need to use the Grid'5000 API, the entry-point for the home of a user on a specific site is:

https://api.grid5000.fr/3.0/sites/site/storage/home/username/access

For Group Storage, the entry-point of a storage on a server server of a site is:

 https://api.grid5000.fr/3.0/sites/site/storage/server/storage/access

For example, https://api.grid5000.fr/3.0/sites/lille/storage/storage1/my-team-storage/access

	Note
	Only the home owner can interact with his or her accesses, so you need to be authenticated. It's done automatically on the frontend. With curl, you can also use the -u username option and you will be prompted for your password before the request is sent.

Usage

We assume that we want to manage the home of user jpicard on nancy, so the storage API entry-point will be:

  https://api.grid5000.fr/3.0/sites/nancy/storage/home/jpicard/access

Create access

Accesses creation is done by sending a POST request to the API with a JSON payload. We must provide a list of hosts to whom we want to give access to, for instance dahu-1.grenoble.grid5000.fr and dahu-2.grenoble.grid5000.fr. We also need a termination condition, it can be a specific date or a job termination.

	Note
	To give access to a home from a specific VLAN, you can use its domain name, for example for dahu-1 on VLAN 2, you can add dahu-1-kavlan-2.grenoble.grid5000.fr.

Until termination

If we want to use a specific time (for example 2018-12-25 19:38), we send the following request to the Storage API:

 curl -X POST 'https://api.grid5000.fr/3.0/sites/nancy/storage/home/jpicard/access' 
 -H "Content-Type: application/json" 
 -d '{"hosts": ["dahu-1.grenoble.grid5000.fr", "dahu-2.grenoble.grid5000.fr"], 
      "termination" : {"until":"2018-12-25 19:38"}}'

Job termination

If we want our access to be valid until the end of a Grid'5000 job, for example the job 4548 of grenoble, we do:

 curl -X POST 'https://api.grid5000.fr/3.0/sites/nancy/storage/home/jpicard/access'
 -H "Content-Type: application/json" 
 -d '{"hosts": ["dahu-1.grenoble.grid5000.fr", "dahu-2.grenoble.grid5000.fr"], 
      "termination" : {"job": 4548, "site": "grenoble"}}'

If we want to give access to all the assigned nodes of a job, we don't need to give any hosts, the API will fill them for us:

 curl -X POST 'https://api.grid5000.fr/3.0/sites/nancy/storage/home/jpicard/access'
 -H "Content-Type: application/json"
 -d '{"termination" : {"job": 4548, "site": "grenoble"}}'

	Warning
	The access is created immediately and is valid until the termination of the job, even if the job has not started yet.

The nfs_address field will contain the address used to manually mount the home:

node:

mount srv-data.nancy.grid5000.fr:/export/home/jpicard /mnt/

	Note
	Debian nfs, big and std environments (such as debian11-x64-nfs) use autofs for the home directories of the local NFS server. So doing cd /home/jpicard/ will automount the home of jpicard if you have the rights.

	Warning
	When access is explicitly given to a group storage (e.g. this is not done automatically by the job management system), this group storage can be mounted using the mount command as super-user (via sudo-g5k or in a deploy job). However, trying to access to the group storage in the autofs mount point in /srv/storage/ is not supported.

List access

To list all accesses, you should do:

 curl https://api.grid5000.fr/3.0/sites/nancy/storage/home/jpicard/access

You get a list of accesses:

 {
   "G5k-home_jpicard_j_1666466-nancy_1": {
     "ipv4": [
       "172.16.64.97"
     ],
     "termination": {
       "job": 1666466,
       "site": "nancy"
     },
     "nfs_address": "srv-data.nancy.grid5000.fr:/export/home/jpicard"
   },
   "G5k-home_jpicard_u_1535456240_1": {
     "ipv4": [
       "172.16.64.16"
     ],
     "termination": {
       "until": 1535456240,
     },
     "nfs_address": "srv-data.nancy.grid5000.fr:/export/home/jpicard"
   }
 }

You can also ask for a specific access by providing its identifier, for instance:

 curl https://api.grid5000.fr/3.0/sites/nancy/storage/home/jpicard/access/G5k-home_jpicard_u_1535456240_1

Delete an access

Access deletion is done by sending a DELETE request to the API with the access identifier.

curl -X DELETE https://api.grid5000.fr/3.0/sites/nancy/storage/home/jpicard/access/G5k-home_jpicard_u_1535456240_1

API Specification

See here for the storage manager API specification.