Provide the task to provision LXC containers.

cookbooks/lxc/default.rb

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+# Install the necessary packages:
+include_recipe './packages.rb'
+include_recipe './eget.rb'
+
+# `unattended-upgrade` settings:
+include_recipe './unattended-upgrade.rb'
+
+# `ufw` configurations:
+include_recipe './ufw.rb'
+
+# timezone configurations:
+include_recipe './timezone.rb'
+
+execute 'ufw allow 22/tcp' do
+  notifies :run, 'execute[ufw reload-or-enable]'
+end

cookbooks/lxc/eget.rb

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+result = run_command('which eget',  error: false)
+if result.exit_status != 0
+  # Install eget
+  execute 'curl https://zyedidia.github.io/eget.sh | sh' do
+    cwd '/usr/local/bin/'
+  end
+
+  execute 'chown root:root /usr/local/bin/eget'
+  execute 'chmod 755 /usr/local/bin/eget'
+end
+
+%w( zyedidia/eget mgdm/htmlq ).each do |p|
+  execute "eget #{p} --to /usr/local/bin/ --upgrade-only"
+end

cookbooks/lxc/files/etc/apt/apt.conf.d/20auto-upgrades

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+APT::Periodic::Update-Package-Lists "1";
+APT::Periodic::Unattended-Upgrade "1";

cookbooks/lxc/files/etc/apt/apt.conf.d/50unattended-upgrades

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+// Automatically upgrade packages from these (origin:archive) pairs
+//
+// Note that in Ubuntu security updates may pull in new dependencies
+// from non-security sources (e.g. chromium). By allowing the release
+// pocket these get automatically pulled in.
+Unattended-Upgrade::Allowed-Origins {
+	"${distro_id}:${distro_codename}";
+	"${distro_id}:${distro_codename}-security";
+	// Extended Security Maintenance; doesn't necessarily exist for
+	// every release and this system may not have it installed, but if
+	// available, the policy for updates is such that unattended-upgrades
+	// should also install from here by default.
+	"${distro_id}ESMApps:${distro_codename}-apps-security";
+	"${distro_id}ESM:${distro_codename}-infra-security";
+//	"${distro_id}:${distro_codename}-updates";
+//	"${distro_id}:${distro_codename}-proposed";
+//	"${distro_id}:${distro_codename}-backports";
+};
+
+// Python regular expressions, matching packages to exclude from upgrading
+Unattended-Upgrade::Package-Blacklist {
+    // The following matches all packages starting with linux-
+//  "linux-";
+
+    // Use $ to explicitely define the end of a package name. Without
+    // the $, "libc6" would match all of them.
+//  "libc6$";
+//  "libc6-dev$";
+//  "libc6-i686$";
+
+    // Special characters need escaping
+//  "libstdc\+\+6$";
+
+    // The following matches packages like xen-system-amd64, xen-utils-4.1,
+    // xenstore-utils and libxenstore3.0
+//  "(lib)?xen(store)?";
+
+    // For more information about Python regular expressions, see
+    // https://docs.python.org/3/howto/regex.html
+};
+
+// This option controls whether the development release of Ubuntu will be
+// upgraded automatically. Valid values are "true", "false", and "auto".
+Unattended-Upgrade::DevRelease "auto";
+
+// This option allows you to control if on a unclean dpkg exit
+// unattended-upgrades will automatically run
+//   dpkg --force-confold --configure -a
+// The default is true, to ensure updates keep getting installed
+//Unattended-Upgrade::AutoFixInterruptedDpkg "true";
+
+// Split the upgrade into the smallest possible chunks so that
+// they can be interrupted with SIGTERM. This makes the upgrade
+// a bit slower but it has the benefit that shutdown while a upgrade
+// is running is possible (with a small delay)
+//Unattended-Upgrade::MinimalSteps "true";
+
+// Install all updates when the machine is shutting down
+// instead of doing it in the background while the machine is running.
+// This will (obviously) make shutdown slower.
+// Unattended-upgrades increases logind's InhibitDelayMaxSec to 30s.
+// This allows more time for unattended-upgrades to shut down gracefully
+// or even install a few packages in InstallOnShutdown mode, but is still a
+// big step back from the 30 minutes allowed for InstallOnShutdown previously.
+// Users enabling InstallOnShutdown mode are advised to increase
+// InhibitDelayMaxSec even further, possibly to 30 minutes.
+//Unattended-Upgrade::InstallOnShutdown "false";
+
+// Send email to this address for problems or packages upgrades
+// If empty or unset then no email is sent, make sure that you
+// have a working mail setup on your system. A package that provides
+// 'mailx' must be installed. E.g. "user@example.com"
+//Unattended-Upgrade::Mail "";
+
+// Set this value to one of:
+//    "always", "only-on-error" or "on-change"
+// If this is not set, then any legacy MailOnlyOnError (boolean) value
+// is used to chose between "only-on-error" and "on-change"
+//Unattended-Upgrade::MailReport "on-change";
+
+// Remove unused automatically installed kernel-related packages
+// (kernel images, kernel headers and kernel version locked tools).
+Unattended-Upgrade::Remove-Unused-Kernel-Packages "true";
+
+// Do automatic removal of newly unused dependencies after the upgrade
+Unattended-Upgrade::Remove-New-Unused-Dependencies "true";
+
+// Do automatic removal of unused packages after the upgrade
+// (equivalent to apt-get autoremove)
+Unattended-Upgrade::Remove-Unused-Dependencies "true";
+
+// Automatically reboot *WITHOUT CONFIRMATION* if
+//  the file /var/run/reboot-required is found after the upgrade
+Unattended-Upgrade::Automatic-Reboot "false";
+
+// Automatically reboot even if there are users currently logged in
+// when Unattended-Upgrade::Automatic-Reboot is set to true
+//Unattended-Upgrade::Automatic-Reboot-WithUsers "true";
+
+// If automatic reboot is enabled and needed, reboot at the specific
+// time instead of immediately
+//  Default: "now"
+//Unattended-Upgrade::Automatic-Reboot-Time "02:00";
+
+// Use apt bandwidth limit feature, this example limits the download
+// speed to 70kb/sec
+//Acquire::http::Dl-Limit "70";
+
+// Enable logging to syslog. Default is False
+// Unattended-Upgrade::SyslogEnable "false";
+
+// Specify syslog facility. Default is daemon
+// Unattended-Upgrade::SyslogFacility "daemon";
+
+// Download and install upgrades only on AC power
+// (i.e. skip or gracefully stop updates on battery)
+// Unattended-Upgrade::OnlyOnACPower "true";
+
+// Download and install upgrades only on non-metered connection
+// (i.e. skip or gracefully stop updates on a metered connection)
+// Unattended-Upgrade::Skip-Updates-On-Metered-Connections "true";
+
+// Verbose logging
+// Unattended-Upgrade::Verbose "false";
+
+// Print debugging information both in unattended-upgrades and
+// in unattended-upgrade-shutdown
+// Unattended-Upgrade::Debug "false";
+
+// Allow package downgrade if Pin-Priority exceeds 1000
+// Unattended-Upgrade::Allow-downgrade "false";
+
+// When APT fails to mark a package to be upgraded or installed try adjusting
+// candidates of related packages to help APT's resolver in finding a solution
+// where the package can be upgraded or installed.
+// This is a workaround until APT's resolver is fixed to always find a
+// solution if it exists. (See Debian bug #711128.)
+// The fallback is enabled by default, except on Debian's sid release because
+// uninstallable packages are frequent there.
+// Disabling the fallback speeds up unattended-upgrades when there are
+// uninstallable packages at the expense of rarely keeping back packages which
+// could be upgraded or installed.
+// Unattended-Upgrade::Allow-APT-Mark-Fallback "true";

cookbooks/lxc/files/etc/cron-apt/action.d/3-download

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+autoclean -y
+upgrade -y -o APT::Get::Show-Upgraded=true

cookbooks/lxc/files/etc/cron-apt/config

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+# Configuration for cron-apt. For further information about the possible
+# configuration settings see the README file.
+
+SYSLOGON="always"
+DEBUG="verbose"
+
+MAILON=""
+
+APTCOMMAND=/usr/bin/apt
+
+OPTIONS="-o quiet=1 -o Dir::Etc::SourceList=/etc/apt/security.sources.list"

cookbooks/lxc/packages.rb

@@ -0,0 +1,14 @@
+# Execute `apt update`:
+execute 'apt update'
+
+# Install the necessary packages:
+%w[build-essential zsh vim-nox debian-keyring curl direnv jq avahi-daemon wget gpg coreutils].each do |pkg|
+  package pkg
+end
+
+execute 'ufw allow 5353/udp' do
+  user 'root'
+
+  not_if 'LANG=c ufw status | grep 5353'
+  notifies :run, 'execute[ufw reload-or-enable]'
+end

cookbooks/lxc/templates/etc/apt/sources.list.d/git.list

@@ -0,0 +1 @@
+deb      "http://ppa.launchpad.net/git-core/ppa/ubuntu" <%= @distribution %> main

cookbooks/lxc/timezone.rb

@@ -0,0 +1,23 @@
+case node['platform_version']
+when "18.04", "20.04", "22.04", "24.04"
+  execute 'timedatectl set-timezone Asia/Tokyo' do
+    not_if 'timedatectl | grep Tokyo'
+  end
+else
+  remote_file '/etc/timezone' do
+    user 'root'
+    owner 'root'
+    group 'root'
+    mode '644'
+  end
+
+  [
+    'cp -f /usr/share/zoneinfo/Asia/Tokyo /etc/localtime'
+  ].each do |cmd|
+    execute cmd do
+      user 'root'
+
+      not_if 'diff /usr/share/zoneinfo/Asia/Tokyo /etc/localtime'
+    end
+  end
+end

cookbooks/lxc/ufw.rb

@@ -0,0 +1,6 @@
+execute 'ufw reload-or-enable' do
+  user 'root'
+  command 'LANG=C ufw reload | grep skipping && ufw --force enable || exit 0'
+
+  action :nothing
+end

cookbooks/lxc/unattended-upgrade.rb

@@ -0,0 +1,56 @@
+case run_command('grep VERSION_ID /etc/os-release | awk -F\" \'{print $2}\'').stdout.chomp
+when "18.04"
+  # Install `cron-apt`:
+  package 'cron-apt'
+
+  # From here, we are going to set up `cron-apt` to
+  # install the important security updates every day.
+  remote_file '/etc/cron-apt/config' do
+    user 'root'
+
+    owner 'root'
+    group 'root'
+    mode  '644'
+  end
+
+  remote_file '/etc/cron-apt/action.d/3-download' do
+    user 'root'
+
+    owner 'root'
+    group 'root'
+    mode '644'
+  end
+
+  execute 'grep security /etc/apt/sources.list > /etc/apt/security.sources.list' do
+    user 'root'
+
+    not_if 'test -e /etc/apt/security.sources.list'
+  end
+
+  file '/var/log/cron-apt/log' do
+    user 'root'
+
+    content 'foo\n'
+
+    owner 'root'
+    group 'root'
+    mode '666'
+
+    not_if 'test -e /var/log/cron-apt/log'
+  end
+
+  execute '/usr/sbin/logrotate -f /etc/logrotate.d/cron-apt' do
+    user 'root'
+
+    not_if 'test -e /var/log/cron-apt/log'
+  end
+
+when '20.04', '22.04', '24.04'
+  %w(20auto-upgrades 50unattended-upgrades).each do |conf|
+    remote_file "/etc/apt/apt.conf.d/#{conf}" do
+      owner 'root'
+      group 'root'
+      mode  '644'
+    end
+  end
+end

roles/lxc.rb

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+include_recipe "../cookbooks/lxc/default.rb"
+include_recipe "../cookbooks/vault/default.rb"
+include_recipe "../cookbooks/consul-template/default.rb"
+include_recipe "../cookbooks/consul/default.rb"
+include_recipe "../cookbooks/vector/default.rb"
+include_recipe "../cookbooks/prometheus-exporters/default.rb"

tasks/lxc.rake

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+#!/usr/bin/env rake
+
+desc 'Invoke itamae command for the lxc container'
+task :lxc do
+  node = `ls -1 nodes/*.json | xargs -I % basename % .json | fzf`
+  node.chomp!
+
+  sh "ITAMAE_PASSWORD=musashi bundle ex itamae ssh --host #{node} -j nodes/#{node}.json -u root entrypoint.rb"
+end