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="${VM_EXTRA_PACKAGES} ec2-scripts \ 10 firstboot-freebsd-update firstboot-pkgs isc-dhcp44-client \ 11 ebsnvme-id" 12 13# Include the amazon-ssm-agent package in amd64 images, since some users want 14# to be able to use it on systems which are not connected to the Internet. 15# (It is not enabled by default, however.) This package does not exist for 16# aarch64, so we have to be selective about when we install it. 17if [ "${TARGET_ARCH}" = "amd64" ]; then 18 export VM_EXTRA_PACKAGES="${VM_EXTRA_PACKAGES} amazon-ssm-agent" 19fi 20 21# Set to a list of third-party software to enable in rc.conf(5). 22export VM_RC_LIST="ec2_configinit ec2_fetchkey ec2_loghostkey firstboot_freebsd_update firstboot_pkgs ntpd dev_aws_disk ec2_ephemeral_swap" 23 24# Build with a 4.9 GB partition; the growfs rc.d script will expand 25# the partition to fill the root disk after the EC2 instance is launched. 26# Note that if this is set to <N>G, we will end up with an <N+1> GB disk 27# image since VMSIZE is the size of the filesystem partition, not the disk 28# which it resides within. 29export VMSIZE=5000m 30 31# No swap space; the ec2_ephemeralswap rc.d script will allocate swap 32# space on EC2 ephemeral disks. (If they exist -- the T2 low-cost instances 33# and the C4 compute-optimized instances don't have ephemeral disks. But 34# it would be silly to bloat the image and increase costs for every instance 35# just for those two families, especially since instances ranging in size 36# from 1 GB of RAM to 60 GB of RAM would need different sizes of swap space 37# anyway.) 38export NOSWAP=YES 39 40vm_extra_pre_umount() { 41 # The firstboot_pkgs rc.d script will download the repository 42 # catalogue and install or update pkg when the instance first 43 # launches, so these files would just be replaced anyway; removing 44 # them from the image allows it to boot faster. 45 mount -t devfs devfs ${DESTDIR}/dev 46 chroot ${DESTDIR} ${EMULATOR} env ASSUME_ALWAYS_YES=yes \ 47 /usr/sbin/pkg delete -f -y pkg 48 umount ${DESTDIR}/dev 49 rm ${DESTDIR}/var/db/pkg/repo-*.sqlite 50 51 # The size of the EC2 root disk can be configured at instance launch 52 # time; expand our filesystem to fill the disk. 53 echo 'growfs_enable="YES"' >> ${DESTDIR}/etc/rc.conf 54 55 # EC2 instances use DHCP to get their network configuration. IPv6 56 # requires accept_rtadv. 57 echo 'ifconfig_DEFAULT="SYNCDHCP accept_rtadv"' >> ${DESTDIR}/etc/rc.conf 58 59 # Unless the system has been configured via EC2 user-data, the user 60 # will need to SSH in to do anything. 61 echo 'sshd_enable="YES"' >> ${DESTDIR}/etc/rc.conf 62 63 # The AWS CLI tools are generally useful, and small enough that they 64 # will download quickly; but users will often override this setting 65 # via EC2 user-data. 66 echo 'firstboot_pkgs_list="devel/py-awscli"' >> ${DESTDIR}/etc/rc.conf 67 68 # Enable IPv6 on all interfaces, and spawn DHCPv6 via rtsold 69 echo 'ipv6_activate_all_interfaces="YES"' >> ${DESTDIR}/etc/rc.conf 70 echo 'rtsold_enable="YES"' >> ${DESTDIR}/etc/rc.conf 71 echo 'rtsold_flags="-M /usr/local/libexec/rtsold-M -a"' >> ${DESTDIR}/etc/rc.conf 72 73 # Turn off IPv6 Duplicate Address Detection; the EC2 networking 74 # configuration makes it unnecessary. 75 echo 'net.inet6.ip6.dad_count=0' >> ${DESTDIR}/etc/sysctl.conf 76 77 # Provide a script which rtsold can use to launch DHCPv6 78 mkdir -p ${DESTDIR}/usr/local/libexec 79 cat > ${DESTDIR}/usr/local/libexec/rtsold-M <<'EOF' 80#!/bin/sh 81 82/usr/local/sbin/dhclient -6 -nw -N -cf /dev/null $1 83EOF 84 chmod 755 ${DESTDIR}/usr/local/libexec/rtsold-M 85 86 # The EC2 console is output-only, so while printing a backtrace can 87 # be useful, there's no point dropping into a debugger or waiting 88 # for a keypress. 89 echo 'debug.trace_on_panic=1' >> ${DESTDIR}/boot/loader.conf 90 echo 'debug.debugger_on_panic=0' >> ${DESTDIR}/boot/loader.conf 91 echo 'kern.panic_reboot_wait_time=0' >> ${DESTDIR}/boot/loader.conf 92 93 # The console is not interactive, so we might as well boot quickly. 94 echo 'autoboot_delay="-1"' >> ${DESTDIR}/boot/loader.conf 95 echo 'beastie_disable="YES"' >> ${DESTDIR}/boot/loader.conf 96 97 # Tell gptboot not to wait 3 seconds for a keypress which won't 98 # arrive either. 99 printf -- "-n\n" > ${DESTDIR}/boot.config 100 101 # The emulated keyboard attached to EC2 instances is inaccessible to 102 # users, and there is no mouse attached at all; disable to keyboard 103 # and the keyboard controller (to which the mouse would attach, if 104 # one existed) in order to save time in device probing. 105 echo 'hint.atkbd.0.disabled=1' >> ${DESTDIR}/boot/loader.conf 106 echo 'hint.atkbdc.0.disabled=1' >> ${DESTDIR}/boot/loader.conf 107 108 # EC2 has two consoles: An emulated serial port ("system log"), 109 # which has been present since 2006; and a VGA console ("instance 110 # screenshot") which was introduced in 2016. 111 echo 'boot_multicons="YES"' >> ${DESTDIR}/boot/loader.conf 112 113 # Some older EC2 hardware used a version of Xen with a bug in its 114 # emulated serial port. It is not clear if EC2 still has any such 115 # nodes, but apply the workaround just in case. 116 echo 'hw.broken_txfifo="1"' >> ${DESTDIR}/boot/loader.conf 117 118 # Load the kernel module for the Amazon "Elastic Network Adapter" 119 echo 'if_ena_load="YES"' >> ${DESTDIR}/boot/loader.conf 120 121 # Use the "nda" driver for accessing NVMe disks rather than the 122 # historical "nvd" driver. 123 echo 'hw.nvme.use_nvd="0"' >> ${DESTDIR}/boot/loader.conf 124 125 # Disable KbdInteractiveAuthentication according to EC2 requirements. 126 sed -i '' -e \ 127 's/^#KbdInteractiveAuthentication yes/KbdInteractiveAuthentication no/' \ 128 ${DESTDIR}/etc/ssh/sshd_config 129 130 # Use FreeBSD Update and Portsnap mirrors hosted in AWS 131 sed -i '' -e 's/update.FreeBSD.org/aws.update.FreeBSD.org/' \ 132 ${DESTDIR}/etc/freebsd-update.conf 133 sed -i '' -e 's/portsnap.FreeBSD.org/aws.portsnap.FreeBSD.org/' \ 134 ${DESTDIR}/etc/portsnap.conf 135 136 # Use the NTP service provided by Amazon 137 sed -i '' -e 's/^pool/#pool/' \ 138 -e '1,/^#server/s/^#server.*/server 169.254.169.123 iburst/' \ 139 ${DESTDIR}/etc/ntp.conf 140 141 # Provide a map for accessing Elastic File System mounts 142 cat > ${DESTDIR}/etc/autofs/special_efs <<'EOF' 143#!/bin/sh 144 145if [ $# -eq 0 ]; then 146 # No way to know which EFS filesystems exist and are 147 # accessible to this EC2 instance. 148 exit 0 149fi 150 151# Provide instructions on how to mount the requested filesystem. 152FS=$1 153REGION=`fetch -qo- http://169.254.169.254/latest/meta-data/placement/availability-zone | sed -e 's/[a-z]$//'` 154echo "-nfsv4,minorversion=1,oneopenown ${FS}.efs.${REGION}.amazonaws.com:/" 155EOF 156 chmod 755 ${DESTDIR}/etc/autofs/special_efs 157 158 # The first time the AMI boots, the installed "first boot" scripts 159 # should be allowed to run: 160 # * ec2_configinit (download and process EC2 user-data) 161 # * ec2_fetchkey (arrange for SSH using the EC2-provided public key) 162 # * growfs (expand the filesystem to fill the provided disk) 163 # * firstboot_freebsd_update (install critical updates) 164 # * firstboot_pkgs (install packages) 165 touch ${DESTDIR}/firstboot 166 167 # Any EC2 ephemeral disks seen when the system first boots will 168 # be "new" disks; there is no "previous boot" when they might have 169 # been seen and used already. 170 touch ${DESTDIR}/var/db/ec2_ephemeral_diskseen 171 172 if ! [ -z "${QEMUSTATIC}" ]; then 173 rm -f ${DESTDIR}/${EMULATOR} 174 fi 175 rm -f ${DESTDIR}/etc/resolv.conf 176 177 return 0 178} 179