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" 10 11# Include the amazon-ssm-agent package in amd64 images, since some users want 12# to be able to use it on systems which are not connected to the Internet. 13# (It is not enabled by default, however.) This package does not exist for 14# aarch64, so we have to be selective about when we install it. 15if [ "${TARGET_ARCH}" = "amd64" ]; then 16 export VM_EXTRA_PACKAGES="${VM_EXTRA_PACKAGES} amazon-ssm-agent" 17fi 18 19# Set to a list of third-party software to enable in rc.conf(5). 20export VM_RC_LIST="ec2_configinit ec2_fetchkey ec2_loghostkey firstboot_freebsd_update firstboot_pkgs ntpd" 21 22# Build with a 3 GB UFS partition; the growfs rc.d script will expand 23# the partition to fill the root disk after the EC2 instance is launched. 24# Note that if this is set to <N>G, we will end up with an <N+1> GB disk 25# image since VMSIZE is the size of the UFS partition, not the disk which 26# it resides within. 27export VMSIZE=3072M 28 29# No swap space; the ec2_ephemeralswap rc.d script will allocate swap 30# space on EC2 ephemeral disks. (If they exist -- the T2 low-cost instances 31# and the C4 compute-optimized instances don't have ephemeral disks. But 32# it would be silly to bloat the image and increase costs for every instance 33# just for those two families, especially since instances ranging in size 34# from 1 GB of RAM to 60 GB of RAM would need different sizes of swap space 35# anyway.) 36export NOSWAP=YES 37 38vm_extra_pre_umount() { 39 # The firstboot_pkgs rc.d script will download the repository 40 # catalogue and install or update pkg when the instance first 41 # launches, so these files would just be replaced anyway; removing 42 # them from the image allows it to boot faster. 43 chroot ${DESTDIR} ${EMULATOR} env ASSUME_ALWAYS_YES=yes \ 44 /usr/sbin/pkg delete -f -y pkg 45 rm ${DESTDIR}/var/db/pkg/repo-*.sqlite 46 47 # The size of the EC2 root disk can be configured at instance launch 48 # time; expand our filesystem to fill the disk. 49 echo 'growfs_enable="YES"' >> ${DESTDIR}/etc/rc.conf 50 51 # EC2 instances use DHCP to get their network configuration. IPv6 52 # requires accept_rtadv. 53 echo 'ifconfig_DEFAULT="SYNCDHCP accept_rtadv"' >> ${DESTDIR}/etc/rc.conf 54 55 # Unless the system has been configured via EC2 user-data, the user 56 # will need to SSH in to do anything. 57 echo 'sshd_enable="YES"' >> ${DESTDIR}/etc/rc.conf 58 59 # The AWS CLI tools are generally useful, and small enough that they 60 # will download quickly; but users will often override this setting 61 # via EC2 user-data. 62 echo 'firstboot_pkgs_list="awscli"' >> ${DESTDIR}/etc/rc.conf 63 64 # Enable IPv6 on all interfaces, and use DHCP on both IPv4 and IPv6. 65 echo 'ipv6_activate_all_interfaces="YES"' >> ${DESTDIR}/etc/rc.conf 66 echo 'dhclient_program="/usr/local/sbin/dual-dhclient"' >> ${DESTDIR}/etc/rc.conf 67 68 # The EC2 console is output-only, so while printing a backtrace can 69 # be useful, there's no point dropping into a debugger or waiting 70 # for a keypress. 71 echo 'debug.trace_on_panic=1' >> ${DESTDIR}/boot/loader.conf 72 echo 'debug.debugger_on_panic=0' >> ${DESTDIR}/boot/loader.conf 73 echo 'kern.panic_reboot_wait_time=0' >> ${DESTDIR}/boot/loader.conf 74 75 # The console is not interactive, so we might as well boot quickly. 76 echo 'autoboot_delay="-1"' >> ${DESTDIR}/boot/loader.conf 77 echo 'beastie_disable="YES"' >> ${DESTDIR}/boot/loader.conf 78 79 # The emulated keyboard attached to EC2 instances is inaccessible to 80 # users, and there is no mouse attached at all; disable to keyboard 81 # and the keyboard controller (to which the mouse would attach, if 82 # one existed) in order to save time in device probing. 83 echo 'hint.atkbd.0.disabled=1' >> ${DESTDIR}/boot/loader.conf 84 echo 'hint.atkbdc.0.disabled=1' >> ${DESTDIR}/boot/loader.conf 85 86 # EC2 has two consoles: An emulated serial port ("system log"), 87 # which has been present since 2006; and a VGA console ("instance 88 # screenshot") which was introduced in 2016. 89 echo 'boot_multicons="YES"' >> ${DESTDIR}/boot/loader.conf 90 91 # Some older EC2 hardware used a version of Xen with a bug in its 92 # emulated serial port. It is not clear if EC2 still has any such 93 # nodes, but apply the workaround just in case. 94 echo 'hw.broken_txfifo="1"' >> ${DESTDIR}/boot/loader.conf 95 96 # Load the kernel module for the Amazon "Elastic Network Adapter" 97 echo 'if_ena_load="YES"' >> ${DESTDIR}/boot/loader.conf 98 99 # Disable ChallengeResponseAuthentication according to EC2 100 # requirements. 101 sed -i '' -e \ 102 's/^#ChallengeResponseAuthentication yes/ChallengeResponseAuthentication no/' \ 103 ${DESTDIR}/etc/ssh/sshd_config 104 105 # Use the NTP service provided by Amazon 106 sed -i '' -e 's/^pool/#pool/' \ 107 -e '1,/^#server/s/^#server.*/server 169.254.169.123 iburst/' \ 108 ${DESTDIR}/etc/ntp.conf 109 110 # The first time the AMI boots, the installed "first boot" scripts 111 # should be allowed to run: 112 # * ec2_configinit (download and process EC2 user-data) 113 # * ec2_fetchkey (arrange for SSH using the EC2-provided public key) 114 # * growfs (expand the filesystem to fill the provided disk) 115 # * firstboot_freebsd_update (install critical updates) 116 # * firstboot_pkgs (install packages) 117 touch ${DESTDIR}/firstboot 118 119 rm -f ${DESTDIR}/etc/resolv.conf 120 121 return 0 122} 123