319c9c44f0
We are booting instances outside of rax and they don't always come with extra devices that can be repurposed for swap. If in that case then create a swapfile instead. Note we do not use fallocate as swapon's manpage says this is suboptimal with the linux kernel's swap implementation. Change-Id: I8b9ce18c18e4069aba7de27bb6a9927627b15b49
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 $2; }'`
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# Use the nearest power of two in MB as the swap size.
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# This ensures that the partitions below are aligned properly.
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MEM=`python3 -c "import math ; print(2**int(round(math.log($MEMKB/1024, 2))))"`
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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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