#!/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 G, we will end up with an 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 export NOSWAP=YES ec2_common() { # Delete the pkg package and the repo database; they will likely be # long out of date before the EC2 instance is launched.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 ${DESTDIR}/firstboot if ! [ -z "${QEMUSTATIC}" ]; then rm -f ${DESTDIR}/${EMULATOR} fi rm -f ${DESTDIR}/etc/resolv.conf return 0 }