timsutton

Mitigate issues with network interface configuration in EC2 Mac instances

One issue that EC2 Mac customers often run into with custom AMI creation, is that launching new instances with the AMI can fail reachability health checks. This can be especially common if multiple "layers" of AMI builds are done.

See the "Network interfaces cached in AMIs" slide near the end of this re:Invent 2024 presentation.

Make sure you do these two steps (mentioned on that slide) at the end of the build:

• sudo rm -f /Library/Preferences/SystemConfiguration/NetworkInterfaces.plist
• sudo shutdown -h now

timsutton

➜  proxygen git:(main) ✗ ./build.sh
+++ dirname ./build.sh
++ cd .
++ pwd
+ BASE_DIR=/Users/tim/git/proxygen/proxygen
+ COLOR_RED='\033[0;31m'
+ COLOR_GREEN='\033[0;32m'
+ COLOR_OFF='\033[0m'
+ JOBS=8
+ INSTALL_DEPENDENCIES=true

timsutton

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
    <dict>
        <key>downloadables</key>
        <array>
            <dict>
                <key>category</key>
                <string>simulator</string>
                <key>contentType</key>

timsutton

#!/bin/bash
#
# Example of using hyperfine to benchmark bazel-based builds of Envoy proxy:
# https://github.com/envoyproxy/envoy/

target="//source/exe:envoy_main_common_lib"

# Other examples of targets:
# main binary
# target="//source/exe:envoy-static"

timsutton

#!/bin/bash

set -eu -o pipefail

function machine_uptime_seconds() {
    boottime=$(sysctl -n kern.boottime | perl -n -e'/^.* sec = (\d+)?\,.*$/; print $1')
    now=$(date +%s)
    uptime=$((now - boottime))
    echo $uptime
}

timsutton

#!/usr/bin/env python3

# just a PyObjC example, this of course requires pyobjc also in your python (virtual)env

from Foundation import NSBundle, NSClassFromString

NSBundle.bundleWithPath_("/System/Library/PrivateFrameworks/SystemDesktopAppearance.framework").load()
sda_class = NSClassFromString('SystemDesktopAppearance')

print(sda_class.performSelector_('OSName'))

timsutton

owner=timsutton
repo=brigadier

curl -s "https://api.github.com/repos/${owner}/${repo}/releases \
  | jq . \
  | grep download_count \
  | cut -d : -f 2 \
  | tr -d ' ,' \
  | awk '{s+=$1} END {print s}'

timsutton

#!/bin/bash

# A cleaner alternative to this approach, but which requires a restart, is to populate TCC's SiteOverrides.plist inside
# the TCC app support directory with the following:
# <?xml version="1.0" encoding="UTF-8"?>
# <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
# <plist version="1.0">
# <dict>
# 	<key>Services</key>
# 		<dict>

timsutton

#!/usr/bin/perl
#
## Copyright © 2002-2014, 2018 Apple Inc. All Rights Reserved.
##
## IMPORTANT NOTE: This file is licensed only for use on Apple-branded
## computers and is subject to the terms and conditions of the Apple Software
## License Agreement accompanying the package this file is a part of.
## You may not port this file to another platform without Apple's written consent.
#

timsutton

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<array>
	<dict>
		<key>_SPCommandLineArguments</key>
		<array>
			<string>/usr/sbin/system_profiler</string>
			<string>-nospawn</string>
			<string>-xml</string>