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NOSWAP=YES 22 23ec2_common() { 24 # Delete the pkg package and the repo database; they will likely be 25 # long out of date before the EC2 instance is launched. 26 mount -t devfs devfs ${DESTDIR}/dev 27 chroot ${DESTDIR} ${EMULATOR} env ASSUME_ALWAYS_YES=yes \ 28 /usr/sbin/pkg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 -r ${DESTDIR}/var/db/pkg/repos/FreeBSD 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 # There is no floppy drive on EC2 instances so disable the driver. 57 echo 'hint.fd.0.disabled=1' >> ${DESTDIR}/boot/loader.conf 58 echo 'hint.fdc.0.disabled=1' >> ${DESTDIR}/boot/loader.conf 59 60 # There is no parallel port on EC2 instances so disable driver. 61 echo 'hint.ppc.0.disabled=1' >> ${DESTDIR}/boot/loader.conf 62 63 # EC2 has two consoles: An emulated serial port ("system log"), 64 # which has been present since 2006; and a VGA console ("instance 65 # screenshot") which was introduced in 2016. 66 echo 'boot_multicons="YES"' >> ${DESTDIR}/boot/loader.conf 67 68 # Some older EC2 hardware used a version of Xen with a bug in its 69 # emulated serial port. It is not clear if EC2 still has any such 70 # nodes, but apply the workaround just in case. 71 echo 'hw.broken_txfifo="1"' >> ${DESTDIR}/boot/loader.conf 72 73 # Graviton 1 through Graviton 4 have a bug in their ACPI where they 74 # mark the PL061's pins as needing to be configured in PullUp mode 75 # (in fact the PL061 has no pullup/pulldown resistors). Graviton 1 76 # through Graviton 3 have non-functional PCI _EJ0 and need a value 77 # written to the PCI power status register in order to eject a 78 # device. 79 echo 'debug.acpi.quirks="24"' >> ${DESTDIR}/boot/loader.conf 80 81 # Load the kernel module for the Amazon "Elastic Network Adapter" 82 echo 'if_ena_load="YES"' >> ${DESTDIR}/boot/loader.conf 83 84 # Use the "nda" driver for accessing NVMe disks rather than the 85 # historical "nvd" driver. 86 echo 'hw.nvme.use_nvd="0"' >> ${DESTDIR}/boot/loader.conf 87 88 # Disable KbdInteractiveAuthentication according to EC2 requirements. 89 sed -i '' -e \ 90 's/^#KbdInteractiveAuthentication yes/KbdInteractiveAuthentication no/' \ 91 ${DESTDIR}/etc/ssh/sshd_config 92 93 # RSA host keys are obsolete and also very slow to generate 94 echo 'sshd_rsa_enable="NO"' >> ${DESTDIR}/etc/rc.conf 95 96 # Use FreeBSD Update mirrors hosted in AWS 97 sed -i '' -e 's/update.FreeBSD.org/aws.update.FreeBSD.org/' \ 98 ${DESTDIR}/etc/freebsd-update.conf 99 100 # Use the NTP service provided by Amazon 101 sed -i '' -e 's/^pool/#pool/' \ 102 -e '1,/^#server/s/^#server.*/server 169.254.169.123 iburst/' \ 103 ${DESTDIR}/etc/ntp.conf 104 105 # Provide a map for accessing Elastic File System mounts 106 cat > ${DESTDIR}/etc/autofs/special_efs <<'EOF' 107#!/bin/sh 108 109if [ $# -eq 0 ]; then 110 # No way to know which EFS filesystems exist and are 111 # accessible to this EC2 instance. 112 exit 0 113fi 114 115# Provide instructions on how to mount the requested filesystem. 116FS=$1 117REGION=`fetch -qo- http://169.254.169.254/latest/meta-data/placement/availability-zone | sed -e 's/[a-z]$//'` 118echo "-nfsv4,minorversion=1,oneopenown ${FS}.efs.${REGION}.amazonaws.com:/" 119EOF 120 chmod 755 ${DESTDIR}/etc/autofs/special_efs 121 122 # The first time the AMI boots, run "first boot" scripts. 123 touch ${DESTDIR}/firstboot 124 125 return 0 126} 127 128ec2_base_networking () { 129 # EC2 instances use DHCP to get their network configuration. IPv6 130 # requires accept_rtadv. 131 echo 'ifconfig_DEFAULT="SYNCDHCP accept_rtadv"' >> ${DESTDIR}/etc/rc.conf 132 133 # The EC2 DHCP server can be trusted to know whether an IP address is 134 # assigned to us; we don't need to ARP to check if anyone else is using 135 # the address before we start using it. 136 echo 'dhclient_arpwait="NO"' >> ${DESTDIR}/etc/rc.conf 137 138 # Enable IPv6 on all interfaces, and spawn DHCPv6 via rtsold 139 echo 'ipv6_activate_all_interfaces="YES"' >> ${DESTDIR}/etc/rc.conf 140 echo 'rtsold_enable="YES"' >> ${DESTDIR}/etc/rc.conf 141 echo 'rtsold_flags="-M /usr/local/libexec/rtsold-M -a"' >> ${DESTDIR}/etc/rc.conf 142 143 # Provide a script which rtsold can use to launch DHCPv6 144 mkdir -p ${DESTDIR}/usr/local/libexec 145 cat > ${DESTDIR}/usr/local/libexec/rtsold-M <<'EOF' 146#!/bin/sh 147 148/usr/local/sbin/dhclient -6 -nw -N -cf /dev/null $1 149EOF 150 chmod 755 ${DESTDIR}/usr/local/libexec/rtsold-M 151 152 return 0 153} 154