webapi implementation: use NFS

[joschrew]

NFS should be used to exchange data between processors.
Goal of this ticket is to create an NFS-share on one of my vm's and use it as workspace directory for the webapi and for the processing servers to access the workspaces.

[joschrew]

Set up instructions for NFS

• server:
  • install NFS:
    • sudo apt install nfs-kernel-server
  • create destination folder (folder to be shared):
    • mkdir /home/cloud/nfs-shares/ocrd-webapi
  • create or modify /etc/exports:
    • every client has to be mentioned here. ip ranges are possible, but not used in this
      example. In this example, the nfs is created in a private network between my vm's
    • /home/cloud/nfs-shares/ocrd-webapi 10.254.1.4/24(rw,sync,no_subtree_check) 10.254.1.29/24(rw,sync,no_subtree_check)
  • update services:
    • sudo systemctl restart nfs-kernel-server
    • perhaps it is not enough to just restart the mentioned nfs-service (if it is not possible
      to mount on the client-side). In this case vm has to be restarted
• client:
  • install:
    • sudo apt install nfs-common
  • create destination folder:
    • mkdir ~/nfs-ocrd-webapi
  • mount the nfs:
    • sudo mount -t nfs4 <nfs-server-ip-adress>:/home/<user>/nfs-shares/ocrd-webapi /home/<user>/nfs-ocrd-webapi

[joschrew]

Does not make sense for me yet to use NFS because all processors will run at one machine. Is it possible to get an NFS Share from gwdg?

[tdoan2010]

You set up all processors on one machine for testing, but in a real life, they run on different machines. That's why NFS is needed. You can set up your own NFS or simply get one from GWDG, it doesn't matter.