1#!/bin/sh 2 3# Packages which should be installed onto all EC2 AMIs: 4# * ebsnvme-id, which is very minimal and provides important EBS-specific 5# functionality, 6# * amazon-ssm-agent (not enabled by default, but some users need to use 7# it on systems not connected to the internet). 8export VM_EXTRA_PACKAGES="${VM_EXTRA_PACKAGES} ebsnvme-id amazon-ssm-agent" 9 10# Services which should be enabled by default in rc.conf(5). 11export VM_RC_LIST="dev_aws_disk ntpd" 12 13# Build with a 7.9 GB partition; the growfs rc.d script will expand 14# the partition to fill the root disk after the EC2 instance is launched. 15# Note that if this is set to <N>G, we will end up with an <N+1> GB disk 16# image since VMSIZE is the size of the filesystem partition, not the disk 17# which it resides within. 18export VMSIZE=8000m 19 20# No swap space; it doesn't make sense to provision any as part of the disk 21# image when we could be launching onto a system with anywhere between 0.5 22# and 4096 GB of RAM. 23export NOSWAP=YES 24 25ec2_common() { 26 # Delete the pkg package and the repo database; they will likely be 27 # long out of date before the EC2 instance is launched. 28 mount -t devfs devfs ${DESTDIR}/dev 29 chroot ${DESTDIR} ${EMULATOR} env ASSUME_ALWAYS_YES=yes \ 30 /usr/sbin/pkg delete -f -y pkg 31 umount ${DESTDIR}/dev 32 rm ${DESTDIR}/var/db/pkg/repo-*.sqlite 33 34 # Turn off IPv6 Duplicate Address Detection; the EC2 networking 35 # configuration makes it unnecessary. 36 echo 'net.inet6.ip6.dad_count=0' >> ${DESTDIR}/etc/sysctl.conf 37 38 # Booting quickly is more important than giving users a chance to 39 # access the boot loader via the serial port. 40 echo 'autoboot_delay="-1"' >> ${DESTDIR}/boot/loader.conf 41 echo 'beastie_disable="YES"' >> ${DESTDIR}/boot/loader.conf 42 43 # Tell gptboot not to wait 3 seconds for a keypress which will 44 # never arrive. 45 printf -- "-n\n" > ${DESTDIR}/boot.config 46 47 # The emulated keyboard attached to EC2 instances is inaccessible to 48 # users, and there is no mouse attached at all; disable to keyboard 49 # and the keyboard controller (to which the mouse would attach, if 50 # one existed) in order to save time in device probing. 51 echo 'hint.atkbd.0.disabled=1' >> ${DESTDIR}/boot/loader.conf 52 echo 'hint.atkbdc.0.disabled=1' >> ${DESTDIR}/boot/loader.conf 53 54 # EC2 has two consoles: An emulated serial port ("system log"), 55 # which has been present since 2006; and a VGA console ("instance 56 # screenshot") which was introduced in 2016. 57 echo 'boot_multicons="YES"' >> ${DESTDIR}/boot/loader.conf 58 59 # Some older EC2 hardware used a version of Xen with a bug in its 60 # emulated serial port. It is not clear if EC2 still has any such 61 # nodes, but apply the workaround just in case. 62 echo 'hw.broken_txfifo="1"' >> ${DESTDIR}/boot/loader.conf 63 64 # Load the kernel module for the Amazon "Elastic Network Adapter" 65 echo 'if_ena_load="YES"' >> ${DESTDIR}/boot/loader.conf 66 67 # Use the "nda" driver for accessing NVMe disks rather than the 68 # historical "nvd" driver. 69 echo 'hw.nvme.use_nvd="0"' >> ${DESTDIR}/boot/loader.conf 70 71 # Disable KbdInteractiveAuthentication according to EC2 requirements. 72 sed -i '' -e \ 73 's/^#KbdInteractiveAuthentication yes/KbdInteractiveAuthentication no/' \ 74 ${DESTDIR}/etc/ssh/sshd_config 75 76 # Use FreeBSD Update mirrors hosted in AWS 77 sed -i '' -e 's/update.FreeBSD.org/aws.update.FreeBSD.org/' \ 78 ${DESTDIR}/etc/freebsd-update.conf 79 80 # Use the NTP service provided by Amazon 81 sed -i '' -e 's/^pool/#pool/' \ 82 -e '1,/^#server/s/^#server.*/server 169.254.169.123 iburst/' \ 83 ${DESTDIR}/etc/ntp.conf 84 85 # Provide a map for accessing Elastic File System mounts 86 cat > ${DESTDIR}/etc/autofs/special_efs <<'EOF' 87#!/bin/sh 88 89if [ $# -eq 0 ]; then 90 # No way to know which EFS filesystems exist and are 91 # accessible to this EC2 instance. 92 exit 0 93fi 94 95# Provide instructions on how to mount the requested filesystem. 96FS=$1 97REGION=`fetch -qo- http://169.254.169.254/latest/meta-data/placement/availability-zone | sed -e 's/[a-z]$//'` 98echo "-nfsv4,minorversion=1,oneopenown ${FS}.efs.${REGION}.amazonaws.com:/" 99EOF 100 chmod 755 ${DESTDIR}/etc/autofs/special_efs 101 102 # The first time the AMI boots, run "first boot" scripts. 103 touch ${DESTDIR}/firstboot 104 105 return 0 106} 107 108ec2_base_networking () { 109 # EC2 instances use DHCP to get their network configuration. IPv6 110 # requires accept_rtadv. 111 echo 'ifconfig_DEFAULT="SYNCDHCP accept_rtadv"' >> ${DESTDIR}/etc/rc.conf 112 113 # The EC2 DHCP server can be trusted to know whether an IP address is 114 # assigned to us; we don't need to ARP to check if anyone else is using 115 # the address before we start using it. 116 echo 'dhclient_arpwait="NO"' >> ${DESTDIR}/etc/rc.conf 117 118 # Enable IPv6 on all interfaces, and spawn DHCPv6 via rtsold 119 echo 'ipv6_activate_all_interfaces="YES"' >> ${DESTDIR}/etc/rc.conf 120 echo 'rtsold_enable="YES"' >> ${DESTDIR}/etc/rc.conf 121 echo 'rtsold_flags="-M /usr/local/libexec/rtsold-M -a"' >> ${DESTDIR}/etc/rc.conf 122 123 # Provide a script which rtsold can use to launch DHCPv6 124 mkdir -p ${DESTDIR}/usr/local/libexec 125 cat > ${DESTDIR}/usr/local/libexec/rtsold-M <<'EOF' 126#!/bin/sh 127 128/usr/local/sbin/dhclient -6 -nw -N -cf /dev/null $1 129EOF 130 chmod 755 ${DESTDIR}/usr/local/libexec/rtsold-M 131 132 return 0 133} 134