diff --git a/cookbooks/base/attributes.rb b/cookbooks/base/attributes.rb
new file mode 100644
index 0000000..18a755b
--- /dev/null
+++ b/cookbooks/base/attributes.rb
@@ -0,0 +1,15 @@
+# Check whether it is inside the LXC container:
+result = run_command('grep lxc /proc/1/environ', error: false).exit_status
+
+if result == 0
+  lxc = true
+else
+  lxc = false
+end
+
+node.reverse_merge!({
+  'base' => {
+    'LXC' => lxc
+  }
+})
+
diff --git a/cookbooks/lxc/default.rb b/cookbooks/lxc/default.rb
deleted file mode 100644
index f63eb27..0000000
--- a/cookbooks/lxc/default.rb
+++ /dev/null
@@ -1,16 +0,0 @@
-# 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
diff --git a/cookbooks/lxc/eget.rb b/cookbooks/lxc/eget.rb
deleted file mode 100644
index a70978a..0000000
--- a/cookbooks/lxc/eget.rb
+++ /dev/null
@@ -1,14 +0,0 @@
-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
diff --git a/cookbooks/lxc/files/etc/apt/apt.conf.d/20auto-upgrades b/cookbooks/lxc/files/etc/apt/apt.conf.d/20auto-upgrades
deleted file mode 100644
index 8d6d7c8..0000000
--- a/cookbooks/lxc/files/etc/apt/apt.conf.d/20auto-upgrades
+++ /dev/null
@@ -1,2 +0,0 @@
-APT::Periodic::Update-Package-Lists "1";
-APT::Periodic::Unattended-Upgrade "1";
diff --git a/cookbooks/lxc/files/etc/apt/apt.conf.d/50unattended-upgrades b/cookbooks/lxc/files/etc/apt/apt.conf.d/50unattended-upgrades
deleted file mode 100644
index 307996d..0000000
--- a/cookbooks/lxc/files/etc/apt/apt.conf.d/50unattended-upgrades
+++ /dev/null
@@ -1,143 +0,0 @@
-// 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";
diff --git a/cookbooks/lxc/files/etc/cron-apt/action.d/3-download b/cookbooks/lxc/files/etc/cron-apt/action.d/3-download
deleted file mode 100644
index 93d2631..0000000
--- a/cookbooks/lxc/files/etc/cron-apt/action.d/3-download
+++ /dev/null
@@ -1,2 +0,0 @@
-autoclean -y
-upgrade -y -o APT::Get::Show-Upgraded=true
diff --git a/cookbooks/lxc/files/etc/cron-apt/config b/cookbooks/lxc/files/etc/cron-apt/config
deleted file mode 100644
index 8c21dc6..0000000
--- a/cookbooks/lxc/files/etc/cron-apt/config
+++ /dev/null
@@ -1,11 +0,0 @@
-# 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"
diff --git a/cookbooks/lxc/packages.rb b/cookbooks/lxc/packages.rb
deleted file mode 100644
index d0d9856..0000000
--- a/cookbooks/lxc/packages.rb
+++ /dev/null
@@ -1,14 +0,0 @@
-# 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
diff --git a/cookbooks/lxc/templates/etc/apt/sources.list.d/git.list b/cookbooks/lxc/templates/etc/apt/sources.list.d/git.list
deleted file mode 100644
index dbb2a29..0000000
--- a/cookbooks/lxc/templates/etc/apt/sources.list.d/git.list
+++ /dev/null
@@ -1 +0,0 @@
-deb      "http://ppa.launchpad.net/git-core/ppa/ubuntu" <%= @distribution %> main
diff --git a/cookbooks/lxc/timezone.rb b/cookbooks/lxc/timezone.rb
deleted file mode 100644
index c5bf6ed..0000000
--- a/cookbooks/lxc/timezone.rb
+++ /dev/null
@@ -1,23 +0,0 @@
-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
diff --git a/cookbooks/lxc/ufw.rb b/cookbooks/lxc/ufw.rb
deleted file mode 100644
index d9ecd41..0000000
--- a/cookbooks/lxc/ufw.rb
+++ /dev/null
@@ -1,6 +0,0 @@
-execute 'ufw reload-or-enable' do
-  user 'root'
-  command 'LANG=C ufw reload | grep skipping && ufw --force enable || exit 0'
-
-  action :nothing
-end
diff --git a/cookbooks/lxc/unattended-upgrade.rb b/cookbooks/lxc/unattended-upgrade.rb
deleted file mode 100644
index 1a522aa..0000000
--- a/cookbooks/lxc/unattended-upgrade.rb
+++ /dev/null
@@ -1,56 +0,0 @@
-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