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SERVER-29877 Mount /data on EBS volume in AWS EC2 instance

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hptabster committed Jul 6, 2017
1 parent f2fc0b1 commit d3ebfcad840947a3d9efd59ccb966ee9884fa865
Showing with 144 additions and 1 deletion.
  1. +1 −1 .gitattributes
  2. +143 −0 buildscripts/mount_ephemeral_drive.sh
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#!/bin/bash
# Script used to mount /data on a separate drive from root.
# This script must be invoked either by a root user or with sudo.
# Currently only supports Windows & Linux.
# See _usage_ for how this script should be invoked.

set -o errexit

# Default options
fs_type=xfs
user_group=$USER:$(id -Gn $USER | cut -f1 -d ' ')

# _usage_: Provides usage infomation
function _usage_ {
cat << EOF
usage: $0 options
This script supports the following parameters for Windows & Linux platforms:
-d <deviceNames>, REQUIRED, Space separated list of devices to mount /data on,
i.e., "xvdb xvdc", more than one device indicates a RAID set.
For Windows, specify the drive letter, i.e., "z".
-r <raidDeviceName>, REQUIRED, if more the one device is specified in <deviceNames>,
i.e., md0.
Not supported on Windows.
-t <fsType>, File system type, defaults to '$fs_type'.
Not supported on Windows.
-o <mountOptions>, File system mount options, i.e., "-m crc=0,finobt=0".
Not supported on Windows.
-u <user:group>, User:Group to make owner of /data. Defaults to '$user_group'.
EOF
}


# Parse command line options
while getopts "d:o:r:t:u:?" option
do
case $option in
d)
device_names=$OPTARG
;;
o)
mount_options=$OPTARG
;;
r)
raid_device_name=$OPTARG
;;
t)
fs_type=$OPTARG
;;
u)
user_group=$OPTARG
;;
\?|*)
_usage_
exit 0
;;
esac
done

# Determine how many devices were specified
num_devices=0
for device_name in $device_names
do
devices="$devices /dev/$device_name"
let "num_devices=num_devices+1"
done

# $OS is defined in Cygwin
if [ "Windows_NT" = "$OS" ]; then
if [ $num_devices -ne 1 ]; then
echo "Must specify only one drive"
_usage_
exit 1
fi

i=0
DRIVE_POLL_DELAY=1
DRIVE_RETRY_MAX=240

drive=$device_names
system_drive=c

while true; do
sleep "$DRIVE_POLL_DELAY"
echo "Looking for ephemeral drive '$drive'"
if [ -d "/cygdrive/$drive" ]; then
echo "Found ephemeral drive"
rm -rf /data
rm -rf /cygdrive/$system_drive/data
mkdir -p /cygdrive/$drive/data/db
cmd.exe /c mklink /J $system_drive:\\data $drive:\\data
ln -s /cygdrive/$system_drive/data /data
chown -R $user_group /data
break
fi
let "i=i+1"
if [ "$i" -eq "$DRIVE_RETRY_MAX" ]; then
echo "TIMED OUT trying to mount ephemeral drive."
exit 1
fi
done

elif [ $(uname | awk '{print tolower($0)}') = "linux" ]; then
if [ $num_devices -eq 0 ]; then
echo "Must specify atleast one device"
_usage_
exit 1
elif [ $num_devices -gt 1 ]; then
if [ -z "$raid_device_name" ]; then
echo "Missing RAID device name"
_usage_
exit 1
fi
fi

# Unmount the current devices, if already mounted
umount /mnt || true
umount $devices || true

# Determine if we have a RAID set
if [ ! -z "$raid_device_name" ]; then
echo "Creating RAID set on '$raid_device_name' for devices '$devices'"
device_name=/dev/$raid_device_name
/sbin/udevadm control --stop-exec-queue
yes | /sbin/mdadm --create $device_name --level=0 -c256 --raid-devices=$num_devices $devices
/sbin/udevadm control --start-exec-queue
/sbin/mdadm --detail --scan > /etc/mdadm.conf
/sbin/blockdev --setra 32 $device_name
else
device_name=$devices
fi

# Mount the ephemeral drive(s)
/sbin/mkfs.$fs_type $mount_options -f $device_name
mkdir -p /data/db || true
echo "$device_name /data auto noatime 0 0" | tee -a /etc/fstab
mount -t $fs_type $device_name /data
chown -R $user_group /data
mkdir /data/tmp
chmod 1777 /data/tmp
else
echo "Unsupported OS '$(uname)'"
exit 0
fi

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