nfs #7

Description

Installs an NFS server that other charms can relate to in order
to create exports and attach to the NFS storage


Overview

This is the NFS charm with support for trusty, xenial, and bionic. It creates an NFSv4(http://nfs.sourceforge.net/)
server using the local filesystem as a backing store. There is no clustering or
federation, so multiple units would result in multiple nfs servers. This is NOT
a highly available server.

Usage

To deploy an NFS server:

juju deploy nfs

Each relation to the NFS charm will result in a new export for the units in that
application. The default location of data is /srv/data

Note that the NFS charm will NOT destroy data. This means if you remove a relation
to an application, you will need to manually destroy the data saved by that application
in the local data location.

Kubernetes

conjure-up canonical-kubernetes
juju deploy nfs
juju add-relation nfs kubernetes-worker

Owncloud

juju deploy nfs
juju deploy mysql
juju deploy owncloud
juju add-relation mysql:owncloud
juju add-relation nfs:nfs owncloud:shared-fs

The above example deploys OwnCloud personal cloud storage, and provides remote storage via the NFS host.

Wordpress

juju deploy nfs
juju deploy mysql
juju deploy wordpress
juju add-relation mysql:db wordpress:db
juju add-relation nfs:nfs wordpress:nfs

Known Limitations and Issues

No high availability story

At present the charms consuming an NFS relationship only account for a single host. Most charms assume the first incoming NFS mount-point is the sole replacement, and subsequent NFS relationship-join requests are ignored.

If you are attempting to deploy NFS to an LXC container, such as the juju local provider, there are additional steps that need to be taken prior to deploying the NFS charm.

On the LXC host:

apt-get install nfs-common
modprobe nfsd
mount -t nfsd nfsd /proc/fs/nfsd

Edit /etc/apparmor.d/lxc/lxc-default and add the following three lines to it:

mount fstype=nfs,
mount fstype=nfs4,
mount fstype=nfsd,
mount fstype=rpc_pipefs,

after which:

sudo /etc/init.d/apparmor restart

Finally:

juju deploy nfs

Configuration

  • storage_root: The root path where exported directories will be created
  • export_options: The default export options. Ships with rw,sync,no_root_squash,no_all_squash

Contact Information

Mike Wilson mike.wilson@canonical.com

Upstream NFS Project

Configuration

export_options
(string) The default export options
rw,sync,no_root_squash,no_all_squash,no_subtree_check
storage_root
(string) The root path where exported directories will be created
/srv/data
initial_daemon_count
(int) The number of nfs daemons to run on startup
40