NFSCtl - A Simple Bash to provision NFS Volumes for OpenShift

nfsctl.sh

#!/bin/bash
#
# This script is EXPERIMENTAL, and it is not supported by me nor Red Hat.
#

set -e 
set -o pipefail

servername=$(hostname -f)                     # FQDN of the NFS server (localhost)
vgname="storage"                              # Name of LVM VG used for creating the NFS Volumes
mountpath="/exports/nfsctl"                   # Where the NFS Volumes are mounted locally
fstabfile="/etc/fstab"                        # Location of system fstab file (should be default)
exportsfile="/etc/exports.d/nfsctl.exports"   # Where the NFS Exports are configured

touch ${exportsfile}

create() {
    lvsize="${1}Gi"
    lvname="pv-nfs-$(uuidgen)"
    
    if lvcreate --quiet -Wy --yes "${vgname}" -L "${lvsize}" -n "${lvname}"; then
        devname="/dev/${vgname}/${lvname}"
        mountdir="${mountpath}/${lvname}"
        mkfs.xfs -q -f "${devname}"
        mkdir -p "${mountdir}"
        echo "${devname}  ${mountdir}  xfs  defaults  0 0" >> "${fstabfile}"
        mount "${devname}"
        chown -R nfsnobody:nfsnobody "${mountdir}"
        chmod 777 -R "${mountdir}"
        echo "${mountdir} *(rw,root_squash,no_wdelay,sync)" >> "${exportsfile}"
        exportfs -r
        echo 
        echo "NFS Volume ${lvname} with ${lvsize} created and exported!"
        echo 
        echo "Using OpenShift CLI as logged as cluster admin, create the PV with:"
        printf "\n$ oc create -f - <ENTER>\napiVersion: v1\nkind: PersistentVolume\nmetadata:\n  name: %s \nspec:\n  capacity:\n    storage: %s \n  accessModes:\n  - ReadWriteMany \n  - ReadWriteOnce \n  nfs: \n    path: %s \n    server: %s \n  persistentVolumeReclaimPolicy: Retain\n<CTRL+D>\n\n" "${lvname}" "${lvsize}" "${mountdir}" "${servername}"
        exit 0
    else
        echo "Failed to create volume! Manual check required."
        exit -1
    fi    
}

delete() {
    read -r -p "DATA WILL BE COMPLETELY DESTROYED! Are you sure? [y/N] " response
    response=${response,,} # tolower
    if [[ $response =~ ^(yes|y) ]]; then
        sed -i "/${1}/d" ${exportsfile}
        exportfs -ra 
        umount "/dev/${vgname}/${1}" &> /dev/null
        rm -rf "${mountpath:?}/${1}"
        sed -i "/${1}/d" ${fstabfile}
        lvremove -f "${vgname}/${1}" &> /dev/null
        echo "NFS Volume ${vgname} destroyed!"
        exit 0
    fi
    echo "Canceled..."
    exit 1
}

list() {
    df -h | sed -n '1p;/pv-nfs/p' | awk '{ print $2,$5,$6}'
    exit 0
}

case "$1" in
        create)
            create "$2"
            ;;
        delete)
            set +e
            delete "$2"
            ;;
        list)
            list
            ;;
	*)
            echo $"Usage: $0 {create|delete|list}"
            exit 1
esac