Install a NFS Server inside a LXC Container on Proxmox 5.1

proxmox_lxc_nfs_server.md

Installing NFS inside LXC Container on Proxmox 5.1

Host Setup:

Create LXC Container as usual, but do not start it yet.

# Install NFS-Kernel on Host
apt install nfs-kernel-server

# Create a new AppArmor file: 
touch /etc/apparmor.d/lxc/lxc-default-with-nfsd

# Write Profile:
cat > /etc/apparmor.d/lxc/lxc-default-with-nfsd << 'EOF'
# Do not load this file.  Rather, load /etc/apparmor.d/lxc-containers, which
# will source all profiles under /etc/apparmor.d/lxc

profile lxc-container-default-with-nfsd flags=(attach_disconnected,mediate_deleted) {
  #include <abstractions/lxc/container-base>

  # the container may never be allowed to mount devpts.  If it does, it
  # will remount the host's devpts.  We could allow it to do it with
  # the newinstance option (but, right now, we don't).
  deny mount fstype=devpts,
  mount fstype=nfsd,
  mount fstype=rpc_pipefs,
  mount fstype=cgroup -> /sys/fs/cgroup/**,
}
EOF

# Activate the new Profile:
apparmor_parser -r /etc/apparmor.d/lxc-containers

# Add Profile to Container:
# (in this case: id = 200)
echo 'lxc.apparmor.profile = lxc-container-default-with-nfsd' \
  >> /etc/pve/nodes/sniebel/lxc/200.conf

# As well as to it's config:
echo 'lxc.apparmor.profile = lxc-container-default-with-nfsd' \
  >> /var/lib/lxc/200/config
  
# Also add your mountpoint to the container:
# If you have a cluster setup:
echo 'mp0: /mnt/host_storage,mp=/mnt/container_storage' \
  >> /etc/pve/nodes/cluster_node/lxc/200.conf

# If you have a single node setup:
echo 'mp0: /mnt/host_storage,mp=/mnt/container_storage' \
  >> /etc/pve/lxc/200.conf

# Finall start the container:
lxc-start -n 200

Container Setup:

ssh into the container or do a simple lxc-attach -n 200 on your host (where 200 is the id).

# Install nfs
apt update
apt install nfs-kernel-server

# Edit Exports
nano /etc/exports

# or append like so (example):
echo '/mnt/container_storage 192.168.0.0/16(rw,async,insecure,no_subtree_check,all_squash,anonuid=501,anongid=100,fsid=1)' \
  >> /etc/exports

# disconnect from the container

# Restart it:

Host again:

Back on the Host restart the container:

lxc-stop -n 200
lxc-start -n 200

Because the nfs-kernel is on the host, the container cannot access it's status. service nfsd status therefore shows as 'not running' inside the container. .. this seems to be normal (?)

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Further useful commands:

nfsstat # list NFS statistics