5e43926b5e
We just discovered that a number of new servers have rather small swap sizes. It appears this snuck in via change 782898 which tries to bound the max swap size to 8GB. Unfortunately the input to parted expects MB so we make a swap size of 8MB instead of 8GB. Bump the min value to 8192 to fix this. Change-Id: I76b5b7dd8ac76c2ecbab9064bcdf956394b3a770
78 lines
3.3 KiB
Bash
78 lines
3.3 KiB
Bash
#!/bin/bash
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# Copyright 2013 OpenStack Foundation
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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# If we're running on a cloud server with no swap, fix that:
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if [ `grep SwapTotal /proc/meminfo | awk '{ print $2; }'` -eq 0 ]; then
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if [ -b /dev/vdb ]; then
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DEV='/dev/vdb'
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elif [ -b /dev/xvde ]; then
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DEV='/dev/xvde'
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fi
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SWAPFILE=/swapfile
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MEMKB=`grep MemTotal /proc/meminfo | awk '{print $2; }'`
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# Use the nearest power of two in MB as the swap size.
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# This ensures that the partitions below are aligned properly.
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MEM=`python3 -c "import math ; print(min(2**int(round(math.log($MEMKB/1024, 2))),8192))"`
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# Avoid using config drive device for swap
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if [ -n "$DEV" ] && ! blkid | grep $DEV | grep TYPE ; then
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if mount | grep ${DEV} > /dev/null; then
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echo "*** ${DEV} appears to already be mounted"
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echo "*** ${DEV} unmounting and reformating"
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umount ${DEV}
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fi
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parted ${DEV} --script -- \
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mklabel msdos \
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mkpart primary linux-swap 1 ${MEM} \
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mkpart primary ext2 ${MEM} -1
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sync
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# We are only interested in scanning $DEV, not all block devices
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sudo partprobe ${DEV}
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# The device partitions might not show up immediately, make sure
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# they are ready and available for use
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udevadm settle --timeout=0 || echo "Block device not ready yet. Waiting for up to 10 seconds for it to be ready"
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udevadm settle --timeout=10 --exit-if-exists=${DEV}1
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udevadm settle --timeout=10 --exit-if-exists=${DEV}2
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mkswap ${DEV}1
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# The default ratio is 16384 bytes per inode or so. Reduce that to 8192
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# bytes per inode so that we get roughly twice the number of inodes as
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# by default. This should still be well above the block size of 4096.
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# We do this because we have found in at least a couple locations that
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# more inodes is useful and is painful to fix after the fact.
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mkfs.ext4 -i 8192 ${DEV}2
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swapon ${DEV}1
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mount ${DEV}2 /mnt
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rsync -a /opt/ /mnt/
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umount /mnt
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perl -nle "m,${DEV}, || print" -i /etc/fstab
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echo "${DEV}1 none swap sw 0 0" >> /etc/fstab
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echo "${DEV}2 /opt ext4 errors=remount-ro,barrier=0 0 2" >> /etc/fstab
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elif [ ! -f "$SWAPFILE" ] ; then
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# We don't have real devices to use so we make a swap file instead.
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# Note you can skip this by precreating /swapfile.
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# bs here is 1Mb
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sudo dd if=/dev/zero of=${SWAPFILE} bs=1048576 count=${MEM}
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sudo chown root:root $SWAPFILE
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sudo chmod 600 $SWAPFILE
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sudo mkswap $SWAPFILE
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echo "${SWAPFILE} none swap sw 0 0" >> /etc/fstab
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fi
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swapon -a
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mount -a
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fi
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