178 lines
7.3 KiB
Bash
178 lines
7.3 KiB
Bash
#!/bin/sh
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#
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#
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# Packages to install into the image we're creating. This is a deliberately
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# minimalist set, providing only the packages necessary to bootstrap further
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# package installation as specified via EC2 user-data.
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export VM_EXTRA_PACKAGES="${VM_EXTRA_PACKAGES} ec2-scripts \
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firstboot-freebsd-update firstboot-pkgs isc-dhcp44-client \
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ebsnvme-id"
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# Include the amazon-ssm-agent package in amd64 images, since some users want
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# to be able to use it on systems which are not connected to the Internet.
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# (It is not enabled by default, however.) This package does not exist for
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# aarch64, so we have to be selective about when we install it.
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if [ "${TARGET_ARCH}" = "amd64" ]; then
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export VM_EXTRA_PACKAGES="${VM_EXTRA_PACKAGES} amazon-ssm-agent"
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fi
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# Set to a list of third-party software to enable in rc.conf(5).
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export VM_RC_LIST="ec2_configinit ec2_fetchkey ec2_loghostkey firstboot_freebsd_update firstboot_pkgs ntpd dev_aws_disk ec2_ephemeral_swap"
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# Build with a 4.9 GB partition; the growfs rc.d script will expand
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# the partition to fill the root disk after the EC2 instance is launched.
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# Note that if this is set to <N>G, we will end up with an <N+1> GB disk
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# image since VMSIZE is the size of the filesystem partition, not the disk
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# which it resides within.
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export VMSIZE=5000m
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# No swap space; the ec2_ephemeralswap rc.d script will allocate swap
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# space on EC2 ephemeral disks. (If they exist -- the T2 low-cost instances
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# and the C4 compute-optimized instances don't have ephemeral disks. But
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# it would be silly to bloat the image and increase costs for every instance
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# just for those two families, especially since instances ranging in size
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# from 1 GB of RAM to 60 GB of RAM would need different sizes of swap space
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# anyway.)
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export NOSWAP=YES
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vm_extra_pre_umount() {
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# The firstboot_pkgs rc.d script will download the repository
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# catalogue and install or update pkg when the instance first
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# launches, so these files would just be replaced anyway; removing
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# them from the image allows it to boot faster.
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mount -t devfs devfs ${DESTDIR}/dev
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chroot ${DESTDIR} ${EMULATOR} env ASSUME_ALWAYS_YES=yes \
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/usr/sbin/pkg delete -f -y pkg
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umount ${DESTDIR}/dev
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rm ${DESTDIR}/var/db/pkg/repo-*.sqlite
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# The size of the EC2 root disk can be configured at instance launch
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# time; expand our filesystem to fill the disk.
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echo 'growfs_enable="YES"' >> ${DESTDIR}/etc/rc.conf
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# EC2 instances use DHCP to get their network configuration. IPv6
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# requires accept_rtadv.
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echo 'ifconfig_DEFAULT="SYNCDHCP accept_rtadv"' >> ${DESTDIR}/etc/rc.conf
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# Unless the system has been configured via EC2 user-data, the user
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# will need to SSH in to do anything.
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echo 'sshd_enable="YES"' >> ${DESTDIR}/etc/rc.conf
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# The AWS CLI tools are generally useful, and small enough that they
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# will download quickly; but users will often override this setting
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# via EC2 user-data.
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echo 'firstboot_pkgs_list="devel/py-awscli"' >> ${DESTDIR}/etc/rc.conf
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# Enable IPv6 on all interfaces, and spawn DHCPv6 via rtsold
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echo 'ipv6_activate_all_interfaces="YES"' >> ${DESTDIR}/etc/rc.conf
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echo 'rtsold_enable="YES"' >> ${DESTDIR}/etc/rc.conf
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echo 'rtsold_flags="-M /usr/local/libexec/rtsold-M -a"' >> ${DESTDIR}/etc/rc.conf
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# Turn off IPv6 Duplicate Address Detection; the EC2 networking
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# configuration makes it unnecessary.
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echo 'net.inet6.ip6.dad_count=0' >> ${DESTDIR}/etc/sysctl.conf
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# Provide a script which rtsold can use to launch DHCPv6
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mkdir -p ${DESTDIR}/usr/local/libexec
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cat > ${DESTDIR}/usr/local/libexec/rtsold-M <<'EOF'
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#!/bin/sh
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/usr/local/sbin/dhclient -6 -nw -N -cf /dev/null $1
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EOF
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chmod 755 ${DESTDIR}/usr/local/libexec/rtsold-M
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# The EC2 console is output-only, so while printing a backtrace can
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# be useful, there's no point dropping into a debugger or waiting
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# for a keypress.
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echo 'debug.trace_on_panic=1' >> ${DESTDIR}/boot/loader.conf
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echo 'debug.debugger_on_panic=0' >> ${DESTDIR}/boot/loader.conf
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echo 'kern.panic_reboot_wait_time=0' >> ${DESTDIR}/boot/loader.conf
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# The console is not interactive, so we might as well boot quickly.
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echo 'autoboot_delay="-1"' >> ${DESTDIR}/boot/loader.conf
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echo 'beastie_disable="YES"' >> ${DESTDIR}/boot/loader.conf
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# Tell gptboot not to wait 3 seconds for a keypress which won't
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# arrive either.
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printf -- "-n\n" > ${DESTDIR}/boot.config
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# The emulated keyboard attached to EC2 instances is inaccessible to
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# users, and there is no mouse attached at all; disable to keyboard
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# and the keyboard controller (to which the mouse would attach, if
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# one existed) in order to save time in device probing.
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echo 'hint.atkbd.0.disabled=1' >> ${DESTDIR}/boot/loader.conf
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echo 'hint.atkbdc.0.disabled=1' >> ${DESTDIR}/boot/loader.conf
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# EC2 has two consoles: An emulated serial port ("system log"),
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# which has been present since 2006; and a VGA console ("instance
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# screenshot") which was introduced in 2016.
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echo 'boot_multicons="YES"' >> ${DESTDIR}/boot/loader.conf
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# Some older EC2 hardware used a version of Xen with a bug in its
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# emulated serial port. It is not clear if EC2 still has any such
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# nodes, but apply the workaround just in case.
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echo 'hw.broken_txfifo="1"' >> ${DESTDIR}/boot/loader.conf
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# Load the kernel module for the Amazon "Elastic Network Adapter"
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echo 'if_ena_load="YES"' >> ${DESTDIR}/boot/loader.conf
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# Use the "nda" driver for accessing NVMe disks rather than the
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# historical "nvd" driver.
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echo 'hw.nvme.use_nvd="0"' >> ${DESTDIR}/boot/loader.conf
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# Disable KbdInteractiveAuthentication according to EC2 requirements.
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sed -i '' -e \
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's/^#KbdInteractiveAuthentication yes/KbdInteractiveAuthentication no/' \
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${DESTDIR}/etc/ssh/sshd_config
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# Use FreeBSD Update and Portsnap mirrors hosted in AWS
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sed -i '' -e 's/update.FreeBSD.org/aws.update.FreeBSD.org/' \
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${DESTDIR}/etc/freebsd-update.conf
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sed -i '' -e 's/portsnap.FreeBSD.org/aws.portsnap.FreeBSD.org/' \
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${DESTDIR}/etc/portsnap.conf
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# Use the NTP service provided by Amazon
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sed -i '' -e 's/^pool/#pool/' \
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-e '1,/^#server/s/^#server.*/server 169.254.169.123 iburst/' \
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${DESTDIR}/etc/ntp.conf
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# Provide a map for accessing Elastic File System mounts
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cat > ${DESTDIR}/etc/autofs/special_efs <<'EOF'
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#!/bin/sh
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if [ $# -eq 0 ]; then
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# No way to know which EFS filesystems exist and are
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# accessible to this EC2 instance.
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exit 0
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fi
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# Provide instructions on how to mount the requested filesystem.
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FS=$1
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REGION=`fetch -qo- http://169.254.169.254/latest/meta-data/placement/availability-zone | sed -e 's/[a-z]$//'`
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echo "-nfsv4,minorversion=1,oneopenown ${FS}.efs.${REGION}.amazonaws.com:/"
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EOF
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chmod 755 ${DESTDIR}/etc/autofs/special_efs
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# The first time the AMI boots, the installed "first boot" scripts
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# should be allowed to run:
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# * ec2_configinit (download and process EC2 user-data)
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# * ec2_fetchkey (arrange for SSH using the EC2-provided public key)
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# * growfs (expand the filesystem to fill the provided disk)
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# * firstboot_freebsd_update (install critical updates)
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# * firstboot_pkgs (install packages)
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touch ${DESTDIR}/firstboot
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# Any EC2 ephemeral disks seen when the system first boots will
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# be "new" disks; there is no "previous boot" when they might have
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# been seen and used already.
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touch ${DESTDIR}/var/db/ec2_ephemeral_diskseen
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if ! [ -z "${QEMUSTATIC}" ]; then
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rm -f ${DESTDIR}/${EMULATOR}
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fi
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rm -f ${DESTDIR}/etc/resolv.conf
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return 0
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}
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