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|
#!/bin/sh
# Packages which should be installed onto all EC2 AMIs:
# * ebsnvme-id, which is very minimal and provides important EBS-specific
# functionality,
# * amazon-ssm-agent (not enabled by default, but some users need to use
# it on systems not connected to the internet).
export VM_EXTRA_PACKAGES="${VM_EXTRA_PACKAGES} ebsnvme-id amazon-ssm-agent"
# Services which should be enabled by default in rc.conf(5).
export VM_RC_LIST="dev_aws_disk ntpd"
# Build with a 5.9 GB partition; the growfs rc.d script will expand
# the partition to fill the root disk after the EC2 instance is launched.
# Note that if this is set to <N>G, we will end up with an <N+1> GB disk
# image since VMSIZE is the size of the filesystem partition, not the disk
# which it resides within.
export VMSIZE=6000m
# No swap space; it doesn't make sense to provision any as part of the disk
# image when we could be launching onto a system with anywhere between 0.5
# and 4096 GB of RAM.
export NOSWAP=YES
ec2_common() {
# Delete the pkg package and the repo database; they will likely be
# long out of date before the EC2 instance is launched.
mount -t devfs devfs ${DESTDIR}/dev
chroot ${DESTDIR} ${EMULATOR} env ASSUME_ALWAYS_YES=yes \
/usr/sbin/pkg delete -f -y pkg
umount ${DESTDIR}/dev
rm ${DESTDIR}/var/db/pkg/repo-*.sqlite
# Turn off IPv6 Duplicate Address Detection; the EC2 networking
# configuration makes it unnecessary.
echo 'net.inet6.ip6.dad_count=0' >> ${DESTDIR}/etc/sysctl.conf
# Booting quickly is more important than giving users a chance to
# access the boot loader via the serial port.
echo 'autoboot_delay="-1"' >> ${DESTDIR}/boot/loader.conf
echo 'beastie_disable="YES"' >> ${DESTDIR}/boot/loader.conf
# Tell gptboot not to wait 3 seconds for a keypress which will
# never arrive.
printf -- "-n\n" > ${DESTDIR}/boot.config
# The emulated keyboard attached to EC2 instances is inaccessible to
# users, and there is no mouse attached at all; disable to keyboard
# and the keyboard controller (to which the mouse would attach, if
# one existed) in order to save time in device probing.
echo 'hint.atkbd.0.disabled=1' >> ${DESTDIR}/boot/loader.conf
echo 'hint.atkbdc.0.disabled=1' >> ${DESTDIR}/boot/loader.conf
# EC2 has two consoles: An emulated serial port ("system log"),
# which has been present since 2006; and a VGA console ("instance
# screenshot") which was introduced in 2016.
echo 'boot_multicons="YES"' >> ${DESTDIR}/boot/loader.conf
# Some older EC2 hardware used a version of Xen with a bug in its
# emulated serial port. It is not clear if EC2 still has any such
# nodes, but apply the workaround just in case.
echo 'hw.broken_txfifo="1"' >> ${DESTDIR}/boot/loader.conf
# Load the kernel module for the Amazon "Elastic Network Adapter"
echo 'if_ena_load="YES"' >> ${DESTDIR}/boot/loader.conf
# Use the "nda" driver for accessing NVMe disks rather than the
# historical "nvd" driver.
echo 'hw.nvme.use_nvd="0"' >> ${DESTDIR}/boot/loader.conf
# Disable KbdInteractiveAuthentication according to EC2 requirements.
sed -i '' -e \
's/^#KbdInteractiveAuthentication yes/KbdInteractiveAuthentication no/' \
${DESTDIR}/etc/ssh/sshd_config
# Use FreeBSD Update mirrors hosted in AWS
sed -i '' -e 's/update.FreeBSD.org/aws.update.FreeBSD.org/' \
${DESTDIR}/etc/freebsd-update.conf
# Use the NTP service provided by Amazon
sed -i '' -e 's/^pool/#pool/' \
-e '1,/^#server/s/^#server.*/server 169.254.169.123 iburst/' \
${DESTDIR}/etc/ntp.conf
# Provide a map for accessing Elastic File System mounts
cat > ${DESTDIR}/etc/autofs/special_efs <<'EOF'
#!/bin/sh
if [ $# -eq 0 ]; then
# No way to know which EFS filesystems exist and are
# accessible to this EC2 instance.
exit 0
fi
# Provide instructions on how to mount the requested filesystem.
FS=$1
REGION=`fetch -qo- http://169.254.169.254/latest/meta-data/placement/availability-zone | sed -e 's/[a-z]$//'`
echo "-nfsv4,minorversion=1,oneopenown ${FS}.efs.${REGION}.amazonaws.com:/"
EOF
chmod 755 ${DESTDIR}/etc/autofs/special_efs
# The first time the AMI boots, run "first boot" scripts.
touch ${DESTDIR}/firstboot
return 0
}
|
