NFS or Network File System is a protocol designed to access files on the remote host over the computer network and operate them as if they were local files. It is a popular and widely spread standard that is available to everyone.
NFS is a client-server application, which means that the NFS server should be installed on the host that provides shared disk space and NFS clients on the servers that gain access to the shared files.
Jelastic PaaS provides NFS support out-of-the-box for all containers (both client and server). The platform fully supports the third version of the protocol on all certified stacks. The fourth version is supported as a client only. NFSv4 server is implemented on the dedicated Shared Storage Container:
- all containers (except alpine-based nodes) - NFSv3 (client and server) and NFSv4 (client only)
- Shared Storage - NFSv3 (client and server) and NFSv4 (client and server)
1. Jelastic uses the following configurations when setting up NFS clients:
- for NFS 3: nfsvers=3,nolock,udp,soft,timeo=120,retrans=20,_netdev
- for NFS 4: nolock,soft,timeo=30,retrans=2,_netdev
2. Take into consideration the following peculiarities of the data sharing with NFS at Jelastic PaaS:
- regular files cannot be exported (only directories)
- mounted directory cannot start with /proc, /dev, /sys, /run or be equal to the following: /, /bin, /lib, /lib64, /lib32, /usr, /usr/bin, /usr/sbin, /usr/lib, or /usr/lib64 (this list may vary based on your provider’s settings)
- NFS shares do not work with sleeping environments and during the live migration
3. When facing any issues with NFS, you can check the Tasks Panel in the dashboard. Also, the following logs can provide some additional information:
- /var/log/messages on the NFS server
- run the journalctl command on the Shared Storage, custom Docker, or VPS containers