1#!/bin/sh 2# 3# $FreeBSD$ 4# 5 6# Packages to install into the image we're creating. This is a deliberately 7# minimalist set, providing only the packages necessary to bootstrap further 8# package installation as specified via EC2 user-data. 9export VM_EXTRA_PACKAGES="ec2-scripts firstboot-freebsd-update firstboot-pkgs dual-dhclient amazon-ssm-agent" 10 11# Set to a list of third-party software to enable in rc.conf(5). 12export VM_RC_LIST="ec2_configinit ec2_fetchkey ec2_ephemeralswap ec2_loghostkey firstboot_freebsd_update firstboot_pkgs ntpd" 13 14# Build with a 3 GB UFS partition; the growfs rc.d script will expand 15# the partition to fill the root disk after the EC2 instance is launched. 16# Note that if this is set to <N>G, we will end up with an <N+1> GB disk 17# image since VMSIZE is the size of the UFS partition, not the disk which 18# it resides within. 19export VMSIZE=3072M 20 21# No swap space; the ec2_ephemeralswap rc.d script will allocate swap 22# space on EC2 ephemeral disks. (If they exist -- the T2 low-cost instances 23# and the C4 compute-optimized instances don't have ephemeral disks. But 24# it would be silly to bloat the image and increase costs for every instance 25# just for those two families, especially since instances ranging in size 26# from 1 GB of RAM to 60 GB of RAM would need different sizes of swap space 27# anyway.) 28export NOSWAP=YES 29 30vm_extra_pre_umount() { 31 # The firstboot_pkgs rc.d script will download the repository 32 # catalogue and install or update pkg when the instance first 33 # launches, so these files would just be replaced anyway; removing 34 # them from the image allows it to boot faster. 35 chroot ${DESTDIR} env ASSUME_ALWAYS_YES=yes \ 36 /usr/sbin/pkg delete -f -y pkg 37 rm ${DESTDIR}/var/db/pkg/repo-*.sqlite 38 39 # The size of the EC2 root disk can be configured at instance launch 40 # time; expand our filesystem to fill the disk. 41 echo 'growfs_enable="YES"' >> ${DESTDIR}/etc/rc.conf 42 43 # EC2 instances use DHCP to get their network configuration. IPv6 44 # requires accept_rtadv. 45 echo 'ifconfig_DEFAULT="SYNCDHCP accept_rtadv"' >> ${DESTDIR}/etc/rc.conf 46 47 # Unless the system has been configured via EC2 user-data, the user 48 # will need to SSH in to do anything. 49 echo 'sshd_enable="YES"' >> ${DESTDIR}/etc/rc.conf 50 51 # The AWS CLI tools are generally useful, and small enough that they 52 # will download quickly; but users will often override this setting 53 # via EC2 user-data. 54 echo 'firstboot_pkgs_list="awscli"' >> ${DESTDIR}/etc/rc.conf 55 56 # Enable IPv6 on all interfaces, and use DHCP on both IPv4 and IPv6. 57 echo 'ipv6_activate_all_interfaces="YES"' >> ${DESTDIR}/etc/rc.conf 58 echo 'dhclient_program="/usr/local/sbin/dual-dhclient"' >> ${DESTDIR}/etc/rc.conf 59 60 # The EC2 console is output-only, so while printing a backtrace can 61 # be useful, there's no point dropping into a debugger or waiting 62 # for a keypress. 63 echo 'debug.trace_on_panic=1' >> ${DESTDIR}/boot/loader.conf 64 echo 'debug.debugger_on_panic=0' >> ${DESTDIR}/boot/loader.conf 65 echo 'kern.panic_reboot_wait_time=0' >> ${DESTDIR}/boot/loader.conf 66 67 # The console is not interactive, so we might as well boot quickly. 68 echo 'autoboot_delay="-1"' >> ${DESTDIR}/boot/loader.conf 69 echo 'beastie_disable="YES"' >> ${DESTDIR}/boot/loader.conf 70 71 # EC2 has two consoles: An emulated serial port ("system log"), 72 # which has been present since 2006; and a VGA console ("instance 73 # screenshot") which was introduced in 2016. 74 echo 'boot_multicons="YES"' >> ${DESTDIR}/boot/loader.conf 75 76 # Some older EC2 hardware used a version of Xen with a bug in its 77 # emulated serial port. It is not clear if EC2 still has any such 78 # nodes, but apply the workaround just in case. 79 echo 'hw.broken_txfifo="1"' >> ${DESTDIR}/boot/loader.conf 80 81 # Load the kernel module for the Amazon "Elastic Network Adapter" 82 echo 'if_ena_load="YES"' >> ${DESTDIR}/boot/loader.conf 83 84 # Disable ChallengeResponseAuthentication according to EC2 85 # requirements. 86 sed -i '' -e \ 87 's/^#ChallengeResponseAuthentication yes/ChallengeResponseAuthentication no/' \ 88 ${DESTDIR}/etc/ssh/sshd_config 89 90 # Use the NTP service provided by Amazon 91 sed -i '' -e 's/^pool/#pool/' \ 92 -e 's/^#server.*/server 169.254.169.123 iburst/' \ 93 ${DESTDIR}/etc/ntp.conf 94 95 # The first time the AMI boots, the installed "first boot" scripts 96 # should be allowed to run: 97 # * ec2_configinit (download and process EC2 user-data) 98 # * ec2_fetchkey (arrange for SSH using the EC2-provided public key) 99 # * growfs (expand the filesystem to fill the provided disk) 100 # * firstboot_freebsd_update (install critical updates) 101 # * firstboot_pkgs (install packages) 102 touch ${DESTDIR}/firstboot 103 104 rm -f ${DESTDIR}/etc/resolv.conf 105 106 return 0 107} 108