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#!/bin/bash
#
# Resume from hibernation on EC2 and apply workarounds for various issues
#
# Copyright (C) 2020 Canonical Ltd.
#
set -e
# Starting hibinit resume actions
echo "hibinit-resume: begin" >> /var/log/hibinit-resume.log
# Give some time to make sure the system is fully up and running, see LP: #1864041
sleep 2
# Make sure the network is properly resumed
echo "restarting network" >> /var/log/hibinit-resume.log
if grep -q xen_netfront /proc/modules; then
# Xen netfront workaround LP: #1864041
modprobe -r xen_netfront
modprobe xen_netfront
fi
systemctl restart --no-block systemd-networkd
# Temporarily set memory allocation policy to "always overcommit". With
# the default overcommit policy some applications might experience
# out-of-memory errors. Setting the policy to "always overcommit" seems
# to be a safe way to prevent these errors.
OVERCOMMIT_POLICY=$(cat /proc/sys/vm/overcommit_memory)
echo 1 > /proc/sys/vm/overcommit_memory
# Start swapoff and make sure swap file is gone
while :; do
echo "starting swapoff" >> /var/log/hibinit-resume.log
swapoff /swap-hibinit
if grep -q swap-hibinit /proc/swaps; then
echo "swap still active" >> /var/log/hibinit-resume.log
sleep 10
else
break
fi
done
echo "swap disabled" >> /var/log/hibinit-resume.log
cat /proc/swaps >> /var/log/hibinit-resume.log
# Restore previou overcommit policy
echo "$OVERCOMMIT_POLICY" > /proc/sys/vm/overcommit_memory
# All done
echo "hibinit-resume: completed " >> /var/log/hibinit-resume.log
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