This is a tutorial on how to use a Network File System protocol (NFS for short) to connect a shared folder located on a server to a Industrial Edge Device and use it as a volume for Docker container.
Network File System is a file system protocol allowing a user on a client computer to access files over a network like a local storage.
This application example uses OpenSSH-server image made by LinuxServer.io. More info can be found at the following website: OpenSSH-server website.
The client is connected through SSH in Terminal to the OpenSSH-server container running on Industrial Edge Device. The server shares an NFS folder with Industrial Edge Device and the OpenSSH-server container uses this folder as a volume.
- Docker Engine 18.09.6
- Docker-compose 1.25.0
- Ubuntu Server
- nfs-kernel-server package
A step by step installation guide can be found in the docs
If installed correctly, the shared folder at the server will be mounted to the nfs folder at the Industrial Edge Device.
After installing the app to Industrial Edge Device, you should be able to SSH to the OpenSSH-server container to test that everything works correctly. Use the following credentials on your machine to connect to the Edge device to see how the NFS Docker volumes work.
ssh edge@192.168.178.20 -p 45555
password: edge
- This is the server side. As we can see, there is no file in nfs/shared folder. We create new file called hello.txt and write "Hello, IED!" into it.
Note: You may need to change folder permission to access the nfs/shared folder as the server user and to use the echo command to create and write to the hello.txt file. If that is the case, change the folder permission to be accessible to your user or use
sudo chmod 777 -R nfs/for testing purposes.
- This is the client side. After changing directory to nfs, we can see that there is a file called hello.txt and it contains the message "Hello, IED!" written by the server. We then reply to this message with "Hello, Server!" and pass it to the hello.txt file.
- When we take a look back at the server and read the file, we can see that the message successfully arrived and the hello.txt file now contains "Hello, Server!"
- You can find further documentation and help in the following links
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