1#!/bin/sh 2 3# Package which should be installed onto all EC2 AMIs: 4# * ebsnvme-id, which is very minimal and provides important EBS-specific 5# functionality, 6export VM_EXTRA_PACKAGES="${VM_EXTRA_PACKAGES} ebsnvme-id" 7 8# Services which should be enabled by default in rc.conf(5). 9export VM_RC_LIST="dev_aws_disk ntpd" 10 11# Build with a 7.9 GB partition; the growfs rc.d script will expand 12# the partition to fill the root disk after the EC2 instance is launched. 13# Note that if this is set to <N>G, we will end up with an <N+1> GB disk 14# image since VMSIZE is the size of the filesystem partition, not the disk 15# which it resides within. 16export VMSIZE=8000m 17 18# No swap space; it doesn't make sense to provision any as part of the disk 19# image when we could be launching onto a system with anywhere between 0.5 20# and 4096 GB of RAM. 21export NOSWAP=YES 22 23ec2_common() { 24 # Delete the pkg package and the repo database; they will likely be 25 # long out of date before the EC2 instance is launched. 26 mount -t devfs devfs ${DESTDIR}/dev 27 chroot ${DESTDIR} ${EMULATOR} env ASSUME_ALWAYS_YES=yes \ 28 /usr/sbin/pkg delete -f -y pkg 29 umount ${DESTDIR}/dev 30 rm ${DESTDIR}/var/db/pkg/repo-*.sqlite 31 32 # Turn off IPv6 Duplicate Address Detection; the EC2 networking 33 # configuration makes it unnecessary. 34 echo 'net.inet6.ip6.dad_count=0' >> ${DESTDIR}/etc/sysctl.conf 35 36 # Booting quickly is more important than giving users a chance to 37 # access the boot loader via the serial port. 38 echo 'autoboot_delay="-1"' >> ${DESTDIR}/boot/loader.conf 39 echo 'beastie_disable="YES"' >> ${DESTDIR}/boot/loader.conf 40 41 # The EFI RNG on Graviton 2 is particularly slow if we ask for the 42 # default 2048 bytes of entropy; ask for 64 bytes instead. 43 echo 'entropy_efi_seed_size="64"' >> ${DESTDIR}/boot/loader.conf 44 45 # Tell gptboot not to wait 3 seconds for a keypress which will 46 # never arrive. 47 printf -- "-n\n" > ${DESTDIR}/boot.config 48 49 # The emulated keyboard attached to EC2 instances is inaccessible to 50 # users, and there is no mouse attached at all; disable to keyboard 51 # and the keyboard controller (to which the mouse would attach, if 52 # one existed) in order to save time in device probing. 53 echo 'hint.atkbd.0.disabled=1' >> ${DESTDIR}/boot/loader.conf 54 echo 'hint.atkbdc.0.disabled=1' >> ${DESTDIR}/boot/loader.conf 55 56 # EC2 has two consoles: An emulated serial port ("system log"), 57 # which has been present since 2006; and a VGA console ("instance 58 # screenshot") which was introduced in 2016. 59 echo 'boot_multicons="YES"' >> ${DESTDIR}/boot/loader.conf 60 61 # Some older EC2 hardware used a version of Xen with a bug in its 62 # emulated serial port. It is not clear if EC2 still has any such 63 # nodes, but apply the workaround just in case. 64 echo 'hw.broken_txfifo="1"' >> ${DESTDIR}/boot/loader.conf 65 66 # Load the kernel module for the Amazon "Elastic Network Adapter" 67 echo 'if_ena_load="YES"' >> ${DESTDIR}/boot/loader.conf 68 69 # Use the "nda" driver for accessing NVMe disks rather than the 70 # historical "nvd" driver. 71 echo 'hw.nvme.use_nvd="0"' >> ${DESTDIR}/boot/loader.conf 72 73 # Disable KbdInteractiveAuthentication according to EC2 requirements. 74 sed -i '' -e \ 75 's/^#KbdInteractiveAuthentication yes/KbdInteractiveAuthentication no/' \ 76 ${DESTDIR}/etc/ssh/sshd_config 77 78 # RSA host keys are obsolete and also very slow to generate 79 echo 'sshd_rsa_enable="NO"' >> ${DESTDIR}/etc/rc.conf 80 81 # Use FreeBSD Update mirrors hosted in AWS 82 sed -i '' -e 's/update.FreeBSD.org/aws.update.FreeBSD.org/' \ 83 ${DESTDIR}/etc/freebsd-update.conf 84 85 # Use the NTP service provided by Amazon 86 sed -i '' -e 's/^pool/#pool/' \ 87 -e '1,/^#server/s/^#server.*/server 169.254.169.123 iburst/' \ 88 ${DESTDIR}/etc/ntp.conf 89 90 # Provide a map for accessing Elastic File System mounts 91 cat > ${DESTDIR}/etc/autofs/special_efs <<'EOF' 92#!/bin/sh 93 94if [ $# -eq 0 ]; then 95 # No way to know which EFS filesystems exist and are 96 # accessible to this EC2 instance. 97 exit 0 98fi 99 100# Provide instructions on how to mount the requested filesystem. 101FS=$1 102REGION=`fetch -qo- http://169.254.169.254/latest/meta-data/placement/availability-zone | sed -e 's/[a-z]$//'` 103echo "-nfsv4,minorversion=1,oneopenown ${FS}.efs.${REGION}.amazonaws.com:/" 104EOF 105 chmod 755 ${DESTDIR}/etc/autofs/special_efs 106 107 # The first time the AMI boots, run "first boot" scripts. 108 touch ${DESTDIR}/firstboot 109 110 return 0 111} 112 113ec2_base_networking () { 114 # EC2 instances use DHCP to get their network configuration. IPv6 115 # requires accept_rtadv. 116 echo 'ifconfig_DEFAULT="SYNCDHCP accept_rtadv"' >> ${DESTDIR}/etc/rc.conf 117 118 # The EC2 DHCP server can be trusted to know whether an IP address is 119 # assigned to us; we don't need to ARP to check if anyone else is using 120 # the address before we start using it. 121 echo 'dhclient_arpwait="NO"' >> ${DESTDIR}/etc/rc.conf 122 123 # Enable IPv6 on all interfaces, and spawn DHCPv6 via rtsold 124 echo 'ipv6_activate_all_interfaces="YES"' >> ${DESTDIR}/etc/rc.conf 125 echo 'rtsold_enable="YES"' >> ${DESTDIR}/etc/rc.conf 126 echo 'rtsold_flags="-M /usr/local/libexec/rtsold-M -a"' >> ${DESTDIR}/etc/rc.conf 127 128 # Provide a script which rtsold can use to launch DHCPv6 129 mkdir -p ${DESTDIR}/usr/local/libexec 130 cat > ${DESTDIR}/usr/local/libexec/rtsold-M <<'EOF' 131#!/bin/sh 132 133/usr/local/sbin/dhclient -6 -nw -N -cf /dev/null $1 134EOF 135 chmod 755 ${DESTDIR}/usr/local/libexec/rtsold-M 136 137 return 0 138} 139