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

Author: Jonathan Abrahams

.gitattributes

@@ -1,3 +1,3 @@
 *.vcproj -crlf -diff -merge
 *.pbxproj -crlf -diff -merge
-
+*.sh text eol=lf

buildscripts/mount_ephemeral_drive.sh

@@ -0,0 +1,143 @@
+#!/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