211c3ab0c5
EC2 instances from sysctl.conf to loader.conf; these can all be set as loader tunables, and setting them in loader.conf gives us the right behaviour in the event of a kernel panic taking place prior to when sysctl.conf is processed. MFC after: 1 week
108 lines
4.6 KiB
Bash
108 lines
4.6 KiB
Bash
#!/bin/sh
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#
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# $FreeBSD$
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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="ec2-scripts firstboot-freebsd-update firstboot-pkgs dual-dhclient amazon-ssm-agent"
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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_ephemeralswap ec2_loghostkey firstboot_freebsd_update firstboot_pkgs ntpd"
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# Build with a 3 GB UFS 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 UFS partition, not the disk which
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# it resides within.
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export VMSIZE=3072M
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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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chroot ${DESTDIR} env ASSUME_ALWAYS_YES=yes \
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/usr/sbin/pkg delete -f -y pkg
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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="awscli"' >> ${DESTDIR}/etc/rc.conf
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# Enable IPv6 on all interfaces, and use DHCP on both IPv4 and IPv6.
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echo 'ipv6_activate_all_interfaces="YES"' >> ${DESTDIR}/etc/rc.conf
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echo 'dhclient_program="/usr/local/sbin/dual-dhclient"' >> ${DESTDIR}/etc/rc.conf
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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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# 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"' >> ${DESTDIR}/boot/loader.conf
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# Disable ChallengeResponseAuthentication according to EC2
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# requirements.
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sed -i '' -e \
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's/^#ChallengeResponseAuthentication yes/ChallengeResponseAuthentication no/' \
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${DESTDIR}/etc/ssh/sshd_config
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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 's/^#server.*/server 169.254.169.123 iburst/' \
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${DESTDIR}/etc/ntp.conf
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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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rm -f ${DESTDIR}/etc/resolv.conf
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return 0
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}
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