EC2 Mount EBS Volume

mount-volume.sh

#!/bin/bash
set -e

REGION=$(curl -s http://169.254.169.254/latest/meta-data/placement/region)
INSTANCE_ID=$(curl -s http://169.254.169.254/latest/meta-data/instance-id)

VOLUME_NAME=$1
VOLUME_DEVICE=$2

VOLUME_ID=$(aws ec2 describe-volumes --filters "Name=tag:Name,Values=${VOLUME_NAME}" --region "${REGION}" | jq -r .Volumes[0].VolumeId)
VOLUME_STATE=$(aws ec2 describe-volumes --filters "Name=tag:Name,Values=${VOLUME_NAME}" --region "${REGION}" | jq -r .Volumes[0].State)

if [[ "${VOLUME_STATE}" == "in-use" ]]; then
    echo "Volume is already in use, skipping mount."
else
    aws ec2 attach-volume --volume-id "${VOLUME_ID}" --instance-id "${INSTANCE_ID}" --device "${VOLUME_DEVICE}" --region=${REGION}

    while sleep 5; do
        echo "Waiting for volume state: in-use."
        VOLUME_STATE=$(aws ec2 describe-volumes --filters "Name=tag:Name,Values=${VOLUME_NAME}" --region "${REGION}" | jq -r .Volumes[0].State)
        echo "Volume state: ${VOLUME_STATE}"
        if [[ "${VOLUME_STATE}" == "in-use" ]]; then
        break
        fi
    done

    echo "Volume mounted."
fi

mkdir -p "/mnt/${VOLUME_NAME}"

if mountpoint "/mnt/${VOLUME_NAME}"; then
    echo "Filesystem is already mounted."
else
    NVME_ID=$(echo ${VOLUME_ID} | sed 's/\-//g')
    NVME_PATH=$(readlink -f "/dev/disk/by-id/nvme-Amazon_Elastic_Block_Store_${NVME_ID}")

    if [[ $(file -s "${NVME_PATH}") == "${NVME_PATH}: data" ]]; then
        echo "Creating filesystem"
        mkfs -t ext4 "${NVME_PATH}"
    fi

    echo "Mounting ${NVME_PATH} to /mnt/${VOLUME_NAME}"
    mount "${NVME_PATH}" "/mnt/${VOLUME_NAME}"
    echo "Filesystem mounted."
fi

unmount-volume.sh

#!/bin/bash
set -e

REGION=$(curl -s http://169.254.169.254/latest/meta-data/placement/region)

VOLUME_NAME=$1
VOLUME_ID=$(aws ec2 describe-volumes --filters "Name=tag:Name,Values=${VOLUME_NAME}" --region "${REGION}" | jq -r .Volumes[0].VolumeId)

NVME_ID=$(echo ${VOLUME_ID} | sed 's/\-//g')
NVME_PATH=$(readlink -f "/dev/disk/by-id/nvme-Amazon_Elastic_Block_Store_${NVME_ID}")

if mountpoint "/mnt/${VOLUME_NAME}"; then
    umount "/mnt/${VOLUME_NAME}"
else
    echo "Path not mounted."
fi

VOLUME_STATE=$(aws ec2 describe-volumes --filters "Name=tag:Name,Values=${VOLUME_NAME}" --region "${REGION}" | jq -r .Volumes[0].State)
if [[ "${VOLUME_STATE}" == "in-use" ]]; then
    aws ec2 detach-volume --volume-id "${VOLUME_ID}" --region "${REGION}"

    while sleep 5; do
        echo "Waiting for volume state: available"
        VOLUME_STATE=$(aws ec2 describe-volumes --filters "Name=tag:Name,Values=${VOLUME_NAME}" --region "${REGION}" | jq -r .Volumes[0].State)
        echo "Volume state: ${VOLUME_STATE}"
        if [[ "${VOLUME_STATE}" == "available" ]]; then
        break
        fi
    done
else
    echo "Device not in use. State: ${VOLUME_STATE}"
fi

usage.md

These scripts are intended to run on EC2 instances. They need jq and aws-cli and permission to mount/unmount volumes.

Tested on Ubuntu 20.04 AMIs.

# Mount an EBS volume with the name "my-volume-name"
# Format it as ext4 (if unformatted) and mount it at /mnt/my-volume-name
./mount-volume.sh my-volume-name /dev/xdvdaa

# Unmount an EBS volume
./unmount-volume.sh my-volume-name