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 isc-dhcp44-client ebsnvme-id" 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 dev_aws_disk" 21 22# Build with a 4.9 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=5000m 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 mount -t devfs devfs ${DESTDIR}/dev 44 chroot ${DESTDIR} ${EMULATOR} env ASSUME_ALWAYS_YES=yes \ 45 /usr/sbin/pkg delete -f -y pkg 46 umount ${DESTDIR}/dev 47 rm ${DESTDIR}/var/db/pkg/repo-*.sqlite 48 49 # The size of the EC2 root disk can be configured at instance launch 50 # time; expand our filesystem to fill the disk. 51 echo 'growfs_enable="YES"' >> ${DESTDIR}/etc/rc.conf 52 53 # EC2 instances use DHCP to get their network configuration. IPv6 54 # requires accept_rtadv. 55 echo 'ifconfig_DEFAULT="SYNCDHCP accept_rtadv"' >> ${DESTDIR}/etc/rc.conf 56 57 # Unless the system has been configured via EC2 user-data, the user 58 # will need to SSH in to do anything. 59 echo 'sshd_enable="YES"' >> ${DESTDIR}/etc/rc.conf 60 61 # The AWS CLI tools are generally useful, and small enough that they 62 # will download quickly; but users will often override this setting 63 # via EC2 user-data. 64 echo 'firstboot_pkgs_list="awscli"' >> ${DESTDIR}/etc/rc.conf 65 66 # Enable IPv6 on all interfaces, and spawn DHCPv6 via rtsold 67 echo 'ipv6_activate_all_interfaces="YES"' >> ${DESTDIR}/etc/rc.conf 68 echo 'rtsold_enable="YES"' >> ${DESTDIR}/etc/rc.conf 69 echo 'rtsold_flags="-M /usr/local/libexec/rtsold-M -a"' >> ${DESTDIR}/etc/rc.conf 70 71 # Provide a script which rtsold can use to launch DHCPv6 72 mkdir -p ${DESTDIR}/usr/local/libexec 73 cat > ${DESTDIR}/usr/local/libexec/rtsold-M <<'EOF' 74#!/bin/sh 75 76/usr/local/sbin/dhclient -6 -nw -N -cf /dev/null $1 77EOF 78 chmod 755 ${DESTDIR}/usr/local/libexec/rtsold-M 79 80 # The EC2 console is output-only, so while printing a backtrace can 81 # be useful, there's no point dropping into a debugger or waiting 82 # for a keypress. 83 echo 'debug.trace_on_panic=1' >> ${DESTDIR}/boot/loader.conf 84 echo 'debug.debugger_on_panic=0' >> ${DESTDIR}/boot/loader.conf 85 echo 'kern.panic_reboot_wait_time=0' >> ${DESTDIR}/boot/loader.conf 86 87 # The console is not interactive, so we might as well boot quickly. 88 echo 'autoboot_delay="-1"' >> ${DESTDIR}/boot/loader.conf 89 echo 'beastie_disable="YES"' >> ${DESTDIR}/boot/loader.conf 90 91 # The emulated keyboard attached to EC2 instances is inaccessible to 92 # users, and there is no mouse attached at all; disable to keyboard 93 # and the keyboard controller (to which the mouse would attach, if 94 # one existed) in order to save time in device probing. 95 echo 'hint.atkbd.0.disabled=1' >> ${DESTDIR}/boot/loader.conf 96 echo 'hint.atkbdc.0.disabled=1' >> ${DESTDIR}/boot/loader.conf 97 98 # EC2 has two consoles: An emulated serial port ("system log"), 99 # which has been present since 2006; and a VGA console ("instance 100 # screenshot") which was introduced in 2016. 101 echo 'boot_multicons="YES"' >> ${DESTDIR}/boot/loader.conf 102 103 # Some older EC2 hardware used a version of Xen with a bug in its 104 # emulated serial port. It is not clear if EC2 still has any such 105 # nodes, but apply the workaround just in case. 106 echo 'hw.broken_txfifo="1"' >> ${DESTDIR}/boot/loader.conf 107 108 # Load the kernel module for the Amazon "Elastic Network Adapter" 109 echo 'if_ena_load="YES"' >> ${DESTDIR}/boot/loader.conf 110 111 # Use the "nda" driver for accessing NVMe disks rather than the 112 # historical "nvd" driver. 113 echo 'hw.nvme.use_nvd="0"' >> ${DESTDIR}/boot/loader.conf 114 115 # Disable ChallengeResponseAuthentication according to EC2 116 # requirements. 117 sed -i '' -e \ 118 's/^#ChallengeResponseAuthentication yes/ChallengeResponseAuthentication no/' \ 119 ${DESTDIR}/etc/ssh/sshd_config 120 121 # Use FreeBSD Update and Portsnap mirrors hosted in AWS 122 sed -i '' -e 's/update.FreeBSD.org/aws.update.FreeBSD.org/' \ 123 ${DESTDIR}/etc/freebsd-update.conf 124 sed -i '' -e 's/portsnap.FreeBSD.org/aws.portsnap.FreeBSD.org/' \ 125 ${DESTDIR}/etc/portsnap.conf 126 127 # Use the NTP service provided by Amazon 128 sed -i '' -e 's/^pool/#pool/' \ 129 -e '1,/^#server/s/^#server.*/server 169.254.169.123 iburst/' \ 130 ${DESTDIR}/etc/ntp.conf 131 132 # Provide a map for accessing Elastic File System mounts 133 cat > ${DESTDIR}/etc/autofs/special_efs <<'EOF' 134#!/bin/sh 135 136if [ $# -eq 0 ]; then 137 # No way to know which EFS filesystems exist and are 138 # accessible to this EC2 instance. 139 exit 0 140fi 141 142# Provide instructions on how to mount the requested filesystem. 143FS=$1 144REGION=`fetch -qo- http://169.254.169.254/latest/meta-data/placement/availability-zone | sed -e 's/[a-z]$//'` 145echo "-nfsv4,minorversion=1,oneopenown ${FS}.efs.${REGION}.amazonaws.com:/" 146EOF 147 chmod 755 ${DESTDIR}/etc/autofs/special_efs 148 149 # The first time the AMI boots, the installed "first boot" scripts 150 # should be allowed to run: 151 # * ec2_configinit (download and process EC2 user-data) 152 # * ec2_fetchkey (arrange for SSH using the EC2-provided public key) 153 # * growfs (expand the filesystem to fill the provided disk) 154 # * firstboot_freebsd_update (install critical updates) 155 # * firstboot_pkgs (install packages) 156 touch ${DESTDIR}/firstboot 157 158 if ! [ -z "${QEMUSTATIC}" ]; then 159 rm -f ${DESTDIR}/${EMULATOR} 160 fi 161 rm -f ${DESTDIR}/etc/resolv.conf 162 163 return 0 164} 165