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4d1afa14d5
running on EC2. Due to improvements in EC2, the performance penalty which was present on some EC2 instances no longer exists, and enabling this feature now consistently yields ~20% higher throughput with equal or lower latency. Reverts: r286063 Approved by: re (gjb) MFC after: 2 weeks Relnotes: Improved disk throughput on EC2
91 lines
4.1 KiB
Bash
91 lines
4.1 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"
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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"
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# Build with a 1.5 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=1536M
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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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env ASSUME_ALWAYS_YES=yes pkg -c ${DESTDIR} 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.
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echo 'ifconfig_DEFAULT="SYNCDHCP"' >> ${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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# 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}/etc/sysctl.conf
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echo 'debug.debugger_on_panic=0' >> ${DESTDIR}/etc/sysctl.conf
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echo 'kern.panic_reboot_wait_time=0' >> ${DESTDIR}/etc/sysctl.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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# Some EC2 instances run on a version of Xen which has a bug relating
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# to the migration of MSI-X interrupts; this is visible as SR-IOV
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# networking (aka. "EC2 Enhanced Networking") not being able to pass
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# packets. Disable MSI-X interrupt migration to work around this bug.
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echo 'machdep.disable_msix_migration="1"' >> ${DESTDIR}/boot/loader.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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return 0
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}
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