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.
9 export VM_EXTRA_PACKAGES="${VM_EXTRA_PACKAGES} ec2-scripts \
10 firstboot-freebsd-update firstboot-pkgs isc-dhcp44-client \
13 # Include the amazon-ssm-agent package in amd64 images, since some users want
14 # to be able to use it on systems which are not connected to the Internet.
15 # (It is not enabled by default, however.) This package does not exist for
16 # aarch64, so we have to be selective about when we install it.
17 if [ "${TARGET_ARCH}" = "amd64" ]; then
18 export VM_EXTRA_PACKAGES="${VM_EXTRA_PACKAGES} amazon-ssm-agent"
21 # Set to a list of third-party software to enable in rc.conf(5).
22 export VM_RC_LIST="ec2_configinit ec2_fetchkey ec2_loghostkey firstboot_freebsd_update firstboot_pkgs ntpd dev_aws_disk ec2_ephemeral_swap"
24 # Build with a 4.9 GB UFS 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 UFS partition, not the disk which
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
40 vm_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
49 rm ${DESTDIR}/var/db/pkg/repo-*.sqlite
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
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
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
63 # The AWS CLI tools are generally useful, and small enough that they
64 # will download quickly; but users will often override this setting
66 echo 'firstboot_pkgs_list="awscli"' >> ${DESTDIR}/etc/rc.conf
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
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
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'
82 /usr/local/sbin/dhclient -6 -nw -N -cf /dev/null $1
84 chmod 755 ${DESTDIR}/usr/local/libexec/rtsold-M
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
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
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
97 # Tell gptboot not to wait 3 seconds for a keypress which won't
99 printf -- "-n\n" > ${DESTDIR}/boot.config
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
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
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
118 # Load the kernel module for the Amazon "Elastic Network Adapter"
119 echo 'if_ena_load="YES"' >> ${DESTDIR}/boot/loader.conf
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
125 # Disable KbdInteractiveAuthentication according to EC2 requirements.
127 's/^#KbdInteractiveAuthentication yes/KbdInteractiveAuthentication no/' \
128 ${DESTDIR}/etc/ssh/sshd_config
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
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
141 # Provide a map for accessing Elastic File System mounts
142 cat > ${DESTDIR}/etc/autofs/special_efs <<'EOF'
145 if [ $# -eq 0 ]; then
146 # No way to know which EFS filesystems exist and are
147 # accessible to this EC2 instance.
151 # Provide instructions on how to mount the requested filesystem.
153 REGION=`fetch -qo- http://169.254.169.254/latest/meta-data/placement/availability-zone | sed -e 's/[a-z]$//'`
154 echo "-nfsv4,minorversion=1,oneopenown ${FS}.efs.${REGION}.amazonaws.com:/"
156 chmod 755 ${DESTDIR}/etc/autofs/special_efs
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
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 ${DESTDIR}/var/db/ec2_ephemeral_diskseen
172 if ! [ -z "${QEMUSTATIC}" ]; then
173 rm -f ${DESTDIR}/${EMULATOR}
175 rm -f ${DESTDIR}/etc/resolv.conf