EC2インスタンス起動時にインスタンスストアをRAID0にしてswapと任意のディレクトリにマウント

• c3.largeの16GB*2のディスクを
• RAID0にして
• パーティション切って
• 10Gをアプリ置き場(/srv/www/*/releases)、残りをswapにマウントする例

下記をrc.localに追記。

rc.local

# create and mount instance−store disks as raid0(c3.large)
if [ ! -b /dev/md0 -a -b /dev/xvdb -a -b /dev/xvdc ]
then
    umount /dev/xvd[bc]
    yes | mdadm --create /dev/md0 --level=0 -c256 --raid-devices=2 /dev/xvd[bc]
    echo DEVICE /dev/xvdb /dev/xvdc > /etc/mdadm.conf
    mdadm --detail --scan >> /etc/mdadm.conf
    sfdisk /dev/md0 <<EOT
# partition table of /dev/md0
unit: sectors

/dev/md0p1 : start=     1024, size= 20971520, Id=83
/dev/md0p2 : start= 20972544, size= 42980352, Id=83
EOT
    seq 2 | xargs -I{} blockdev --setra 65536 /dev/md0p{}

    # create and mount xfs for application directory
    APPDIR=$(ls -d /srv/www/*/releases)
    APPDIR_OWNER=upuser

    mkfs.xfs /dev/md0p1 -Kf
    [ -e ${APPDIR}/* ] && rm ${APPDIR}/* -rf
    mount -t xfs -o rw,nodev,noatime,nodiratime,nobarrier,discard /dev/md0p1 ${APPDIR}

    chown ${APPDIR_OWNER}: ${APPDIR}
    sed -i -e '/\/mnt/d' -e '/\/dev\/md0p1/d' /etc/fstab
    echo -e "/dev/md0p1\t${APPDIR}\txfs\trw,nodev,noatime,nodiratime,nobarrier,discard,nofail\t0\t0" >> /etc/fstab

    # create and mount swap
    mkswap /dev/md0p2
    swapon /dev/md0p2
    sed -i '/\/dev\/md0p2/d' /etc/fstab
    echo -e "/dev/md0p2\tnone\tswap\tsw\t0\t0" >> /etc/fstab
fi

# deploy itself to master branch
# su ${APPDIR_OWNER} -lc 'cd /opt/capistrano ; cap production deploy'

参考:

• 訳：エフェメラルディスクでRAID0 - aws memo