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="ec2-scripts firstboot-freebsd-update firstboot-pkgs dual-dhclient-daemon ebsnvme-id"
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.
15 if [ "${TARGET_ARCH}" = "amd64" ]; then
16 export VM_EXTRA_PACKAGES="${VM_EXTRA_PACKAGES} amazon-ssm-agent"
19 # Set to a list of third-party software to enable in rc.conf(5).
20 export VM_RC_LIST="ec2_configinit ec2_fetchkey ec2_loghostkey firstboot_freebsd_update firstboot_pkgs ntpd dev_aws_disk"
22 # Build with a 3.9 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
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
38 vm_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
47 rm ${DESTDIR}/var/db/pkg/repo-*.sqlite
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
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
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
61 # The AWS CLI tools are generally useful, and small enough that they
62 # will download quickly; but users will often override this setting
64 echo 'firstboot_pkgs_list="awscli"' >> ${DESTDIR}/etc/rc.conf
66 # Enable IPv6 on all interfaces, and use DHCP on both IPv4 and IPv6.
67 echo 'ipv6_activate_all_interfaces="YES"' >> ${DESTDIR}/etc/rc.conf
68 echo 'dhclient_program="/usr/local/sbin/dual-dhclient"' >> ${DESTDIR}/etc/rc.conf
70 # The EC2 console is output-only, so while printing a backtrace can
71 # be useful, there's no point dropping into a debugger or waiting
73 echo 'debug.trace_on_panic=1' >> ${DESTDIR}/boot/loader.conf
74 echo 'debug.debugger_on_panic=0' >> ${DESTDIR}/boot/loader.conf
75 echo 'kern.panic_reboot_wait_time=0' >> ${DESTDIR}/boot/loader.conf
77 # The console is not interactive, so we might as well boot quickly.
78 echo 'autoboot_delay="-1"' >> ${DESTDIR}/boot/loader.conf
79 echo 'beastie_disable="YES"' >> ${DESTDIR}/boot/loader.conf
81 # The emulated keyboard attached to EC2 instances is inaccessible to
82 # users, and there is no mouse attached at all; disable to keyboard
83 # and the keyboard controller (to which the mouse would attach, if
84 # one existed) in order to save time in device probing.
85 echo 'hint.atkbd.0.disabled=1' >> ${DESTDIR}/boot/loader.conf
86 echo 'hint.atkbdc.0.disabled=1' >> ${DESTDIR}/boot/loader.conf
88 # EC2 has two consoles: An emulated serial port ("system log"),
89 # which has been present since 2006; and a VGA console ("instance
90 # screenshot") which was introduced in 2016.
91 echo 'boot_multicons="YES"' >> ${DESTDIR}/boot/loader.conf
93 # Some older EC2 hardware used a version of Xen with a bug in its
94 # emulated serial port. It is not clear if EC2 still has any such
95 # nodes, but apply the workaround just in case.
96 echo 'hw.broken_txfifo="1"' >> ${DESTDIR}/boot/loader.conf
98 # Load the kernel module for the Amazon "Elastic Network Adapter"
99 echo 'if_ena_load="YES"' >> ${DESTDIR}/boot/loader.conf
101 # Use the "nda" driver for accessing NVMe disks rather than the
102 # historical "nvd" driver.
103 echo 'hw.nvme.use_nvd="0"' >> ${DESTDIR}/boot/loader.conf
105 # Disable ChallengeResponseAuthentication according to EC2
108 's/^#ChallengeResponseAuthentication yes/ChallengeResponseAuthentication no/' \
109 ${DESTDIR}/etc/ssh/sshd_config
111 # Use the NTP service provided by Amazon
112 sed -i '' -e 's/^pool/#pool/' \
113 -e '1,/^#server/s/^#server.*/server 169.254.169.123 iburst/' \
114 ${DESTDIR}/etc/ntp.conf
116 # Provide a map for accessing Elastic File System mounts
117 cat > ${DESTDIR}/etc/autofs/special_efs <<'EOF'
120 if [ $# -eq 0 ]; then
121 # No way to know which EFS filesystems exist and are
122 # accessible to this EC2 instance.
126 # Provide instructions on how to mount the requested filesystem.
128 REGION=`fetch -qo- http://169.254.169.254/latest/meta-data/placement/availability-zone | sed -e 's/[a-z]$//'`
129 echo "-nfsv4,minorversion=1,oneopenown ${FS}.efs.${REGION}.amazonaws.com:/"
131 chmod 755 ${DESTDIR}/etc/autofs/special_efs
133 # The first time the AMI boots, the installed "first boot" scripts
134 # should be allowed to run:
135 # * ec2_configinit (download and process EC2 user-data)
136 # * ec2_fetchkey (arrange for SSH using the EC2-provided public key)
137 # * growfs (expand the filesystem to fill the provided disk)
138 # * firstboot_freebsd_update (install critical updates)
139 # * firstboot_pkgs (install packages)
140 touch ${DESTDIR}/firstboot
142 if ! [ -z "${QEMUSTATIC}" ]; then
143 rm -f ${DESTDIR}/${EMULATOR}
145 rm -f ${DESTDIR}/etc/resolv.conf