98 lines
3.6 KiB
Bash
98 lines
3.6 KiB
Bash
#!/bin/bash
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# Copyright (C) 2016 OpenStack Foundation
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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#
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# Don't attempt to fix disk layout more than once
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[[ -e /etc/fixed_disk_layout ]] && return 0 || sudo touch /etc/fixed_disk_layout
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# Ensure virtual machines from different providers all have at least 8GB of
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# swap.
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# Use an ephemeral disk if there is one or create and use a swapfile.
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# Rackspace also doesn't have enough space on / for two devstack installs,
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# so we partition the disk and mount it on /opt, syncing the previous
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# contents of /opt over.
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SWAPSIZE=8192
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swapcurrent=$(( $(grep SwapTotal /proc/meminfo | awk '{ print $2; }') / 1024 ))
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if [[ $swapcurrent -lt $SWAPSIZE ]]; then
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if [ -b /dev/xvde ]; then
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DEV='/dev/xvde'
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else
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EPHEMERAL_DEV=$(blkid -L ephemeral0 || true)
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if [ -n "$EPHEMERAL_DEV" -a -b "$EPHEMERAL_DEV" ]; then
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DEV=$EPHEMERAL_DEV
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fi
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fi
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if [ -n "$DEV" ]; then
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# If an ephemeral device is available, use it
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swap=${DEV}1
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lvmvol=${DEV}2
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optdev=${DEV}3
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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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sudo umount ${DEV}
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fi
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sudo parted ${DEV} --script -- mklabel msdos
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sudo parted ${DEV} --script -- mkpart primary linux-swap 1 ${SWAPSIZE}
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sudo parted ${DEV} --script -- mkpart primary ext2 8192 -1
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sudo mkswap ${DEV}1
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sudo mkfs.ext4 ${DEV}2
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sudo swapon ${DEV}1
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sudo mount ${DEV}2 /mnt
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sudo find /opt/ -mindepth 1 -maxdepth 1 -exec mv {} /mnt/ \;
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sudo umount /mnt
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sudo mount ${DEV}2 /opt
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# Sanity check
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grep -q ${DEV}1 /proc/swaps || exit 1
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grep -q ${DEV}2 /proc/mounts || exit 1
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else
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# If no ephemeral devices are available, use root filesystem
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# Don't use sparse device to avoid wedging when disk space and
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# memory are both unavailable.
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swapfile='/root/swapfile'
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swapdiff=$(( $SWAPSIZE - $swapcurrent ))
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sudo dd if=/dev/zero of=${swapfile} bs=1M count=${swapdiff}
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sudo chmod 600 ${swapfile}
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sudo mkswap ${swapfile}
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sudo swapon ${swapfile}
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# Sanity check
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grep -q ${swapfile} /proc/swaps || exit 1
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fi
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fi
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# dump vm settings for reference (Ubuntu 12 era procps can get
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# confused with certain proc trigger nodes that are write-only and
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# return a EPERM; ignore this)
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sudo sysctl vm || true
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# ensure a standard level of swappiness. Some platforms
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# (rax+centos7) come with swappiness of 0 (presumably because the
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# vm doesn't come with swap setup ... but we just did that above),
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# which depending on the kernel version can lead to the OOM killer
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# kicking in on some processes despite swap being available;
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# particularly things like mysql which have very high ratio of
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# anonymous-memory to file-backed mappings.
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# make sure reload of sysctl doesn't reset this
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sudo sed -i '/vm.swappiness/d' /etc/sysctl.conf
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# This sets swappiness low; we really don't want to be relying on
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# cloud I/O based swap during our runs
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sudo sysctl -w vm.swappiness=10
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