diff --git a/cloudinit/cmd/main.py b/cloudinit/cmd/main.py
index 54ba79e1bbc..2de9826bb83 100644
--- a/cloudinit/cmd/main.py
+++ b/cloudinit/cmd/main.py
@@ -24,6 +24,7 @@
 from cloudinit import netinfo
 from cloudinit import signal_handler
 from cloudinit import sources
+from cloudinit import socket
 from cloudinit import stages
 from cloudinit import url_helper
 from cloudinit import util
@@ -38,7 +39,12 @@
 from cloudinit.config.schema import validate_cloudconfig_schema
 from cloudinit import log
 from cloudinit.reporting import events
-from cloudinit.settings import PER_INSTANCE, PER_ALWAYS, PER_ONCE, CLOUD_CONFIG
+from cloudinit.settings import (
+    PER_INSTANCE,
+    PER_ALWAYS,
+    PER_ONCE,
+    CLOUD_CONFIG,
+)
 
 # Welcome message template
 WELCOME_MSG_TPL = (
@@ -362,8 +368,11 @@ def main_init(name, args):
     outfmt = None
     errfmt = None
     try:
-        close_stdin(lambda msg: early_logs.append((logging.DEBUG, msg)))
-        outfmt, errfmt = util.fixup_output(init.cfg, name)
+        if not args.skip_log_setup:
+            close_stdin(lambda msg: early_logs.append((logging.DEBUG, msg)))
+            outfmt, errfmt = util.fixup_output(init.cfg, name)
+        else:
+            outfmt, errfmt = util.get_output_cfg(init.cfg, name)
     except Exception:
         msg = "Failed to setup output redirection!"
         util.logexc(LOG, msg)
@@ -375,8 +384,9 @@ def main_init(name, args):
             "Logging being reset, this logger may no longer be active shortly"
         )
         log.reset_logging()
-    log.setup_logging(init.cfg)
-    apply_reporting_cfg(init.cfg)
+    if not args.skip_log_setup:
+        log.setup_logging(init.cfg)
+        apply_reporting_cfg(init.cfg)
 
     # Any log usage prior to setup_logging above did not have local user log
     # config applied.  We send the welcome message now, as stderr/out have
@@ -633,8 +643,9 @@ def main_modules(action_name, args):
     mods = Modules(init, extract_fns(args), reporter=args.reporter)
     # Stage 4
     try:
-        close_stdin()
-        util.fixup_output(mods.cfg, name)
+        if not args.skip_log_setup:
+            close_stdin()
+            util.fixup_output(mods.cfg, name)
     except Exception:
         util.logexc(LOG, "Failed to setup output redirection!")
     if args.debug:
@@ -643,8 +654,9 @@ def main_modules(action_name, args):
             "Logging being reset, this logger may no longer be active shortly"
         )
         log.reset_logging()
-    log.setup_logging(mods.cfg)
-    apply_reporting_cfg(init.cfg)
+    if not args.skip_log_setup:
+        log.setup_logging(mods.cfg)
+        apply_reporting_cfg(init.cfg)
 
     # now that logging is setup and stdout redirected, send welcome
     welcome(name, msg=w_msg)
@@ -804,9 +816,10 @@ def status_wrapper(name, args):
         )
 
     v1[mode]["start"] = float(util.uptime())
-    preexisting_recoverable_errors = next(
+    handler = next(
         filter(lambda h: isinstance(h, log.LogExporter), root_logger.handlers)
-    ).export_logs()
+    )
+    preexisting_recoverable_errors = handler.export_logs()
 
     # Write status.json prior to running init / module code
     atomic_helper.write_json(status_path, status)
@@ -847,11 +860,8 @@ def status_wrapper(name, args):
         v1["stage"] = None
 
         # merge new recoverable errors into existing recoverable error list
-        new_recoverable_errors = next(
-            filter(
-                lambda h: isinstance(h, log.LogExporter), root_logger.handlers
-            )
-        ).export_logs()
+        new_recoverable_errors = handler.export_logs()
+        handler.clean_logs()
         for key in new_recoverable_errors.keys():
             if key in preexisting_recoverable_errors:
                 v1[mode]["recoverable_errors"][key] = list(
@@ -953,9 +963,19 @@ def main(sysv_args=None):
         default=False,
     )
 
+    parser.add_argument(
+        "--all-stages",
+        dest="all_stages",
+        action="store_true",
+        help=(
+            "Run cloud-init's stages under a single process using a "
+            "syncronization protocol. This is not intended for CLI usage."
+        ),
+        default=False,
+    )
+
     parser.set_defaults(reporter=None)
     subparsers = parser.add_subparsers(title="Subcommands", dest="subcommand")
-    subparsers.required = True
 
     # Each action and its sub-options (if any)
     parser_init = subparsers.add_parser(
@@ -1143,8 +1163,76 @@ def main(sysv_args=None):
 
             status_parser(parser_status)
             parser_status.set_defaults(action=("status", handle_status_args))
+    else:
+        parser.error("a subcommand is required")
 
     args = parser.parse_args(args=sysv_args)
+    setattr(args, "skip_log_setup", False)
+    if not args.all_stages:
+        return sub_main(args)
+    return all_stages(parser)
+
+
+def all_stages(parser):
+    """Run all stages in a single process using an ordering protocol."""
+    LOG.info("Running cloud-init in single process mode.")
+
+    # this _must_ be called before sd_notify is called otherwise netcat may
+    # attempt to send "start" before a socket exists
+    sync = socket.SocketSync("local", "network", "config", "final")
+
+    # notify systemd that this stage has completed
+    socket.sd_notify("READY=1")
+    # wait for cloud-init-local.service to start
+    with sync("local"):
+        # set up logger
+        args = parser.parse_args(args=["init", "--local"])
+        args.skip_log_setup = False
+        # run local stage
+        sync.systemd_exit_code = sub_main(args)
+
+    # wait for cloud-init-network.service to start
+    with sync("network"):
+        # skip re-setting up logger
+        args = parser.parse_args(args=["init"])
+        args.skip_log_setup = True
+        # run init stage
+        sync.systemd_exit_code = sub_main(args)
+
+    # wait for cloud-config.service to start
+    with sync("config"):
+        # skip re-setting up logger
+        args = parser.parse_args(args=["modules", "--mode=config"])
+        args.skip_log_setup = True
+        # run config stage
+        sync.systemd_exit_code = sub_main(args)
+
+    # wait for cloud-final.service to start
+    with sync("final"):
+        # skip re-setting up logger
+        args = parser.parse_args(args=["modules", "--mode=final"])
+        args.skip_log_setup = True
+        # run final stage
+        sync.systemd_exit_code = sub_main(args)
+
+    # signal completion to cloud-init-main.service
+    if sync.experienced_any_error:
+        message = "a stage of cloud-init exited non-zero"
+        if sync.first_exception:
+            message = f"first exception received: {sync.first_exception}"
+        socket.sd_notify(
+            f"STATUS=Completed with failure, {message}. Run 'cloud-init status"
+            " --long' for more details."
+        )
+        socket.sd_notify("STOPPING=1")
+        # exit 1 for a fatal failure in any stage
+        return 1
+    else:
+        socket.sd_notify("STATUS=Completed")
+        socket.sd_notify("STOPPING=1")
+
+
+def sub_main(args):
 
     # Subparsers.required = True and each subparser sets action=(name, functor)
     (name, functor) = args.action
diff --git a/cloudinit/cmd/status.py b/cloudinit/cmd/status.py
index 39089802984..f027321ce22 100644
--- a/cloudinit/cmd/status.py
+++ b/cloudinit/cmd/status.py
@@ -318,8 +318,9 @@ def systemd_failed(wait: bool) -> bool:
     for service in [
         "cloud-final.service",
         "cloud-config.service",
-        "cloud-init.service",
+        "cloud-init-network.service",
         "cloud-init-local.service",
+        "cloud-init-main.service",
     ]:
         try:
             stdout = query_systemctl(
diff --git a/cloudinit/config/cc_mounts.py b/cloudinit/config/cc_mounts.py
index 5efcec946d8..1d9f821bbd0 100644
--- a/cloudinit/config/cc_mounts.py
+++ b/cloudinit/config/cc_mounts.py
@@ -524,7 +524,7 @@ def handle(name: str, cfg: Config, cloud: Cloud, args: list) -> None:
     # fs_spec, fs_file, fs_vfstype, fs_mntops, fs-freq, fs_passno
     uses_systemd = cloud.distro.uses_systemd()
     default_mount_options = (
-        "defaults,nofail,x-systemd.after=cloud-init.service,_netdev"
+        "defaults,nofail,x-systemd.after=cloud-init-network.service,_netdev"
         if uses_systemd
         else "defaults,nobootwait"
     )
diff --git a/cloudinit/config/schemas/schema-cloud-config-v1.json b/cloudinit/config/schemas/schema-cloud-config-v1.json
index c05bd994212..4ae8b4a8f70 100644
--- a/cloudinit/config/schemas/schema-cloud-config-v1.json
+++ b/cloudinit/config/schemas/schema-cloud-config-v1.json
@@ -2022,12 +2022,12 @@
         },
         "mount_default_fields": {
           "type": "array",
-          "description": "Default mount configuration for any mount entry with less than 6 options provided. When specified, 6 items are required and represent ``/etc/fstab`` entries. Default: ``defaults,nofail,x-systemd.after=cloud-init.service,_netdev``",
+          "description": "Default mount configuration for any mount entry with less than 6 options provided. When specified, 6 items are required and represent ``/etc/fstab`` entries. Default: ``defaults,nofail,x-systemd.after=cloud-init-network.service,_netdev``",
           "default": [
             null,
             null,
             "auto",
-            "defaults,nofail,x-systemd.after=cloud-init.service",
+            "defaults,nofail,x-systemd.after=cloud-init-network.service",
             "0",
             "2"
           ],
diff --git a/cloudinit/log.py b/cloudinit/log.py
index 61b96262aa1..983b426b7ce 100644
--- a/cloudinit/log.py
+++ b/cloudinit/log.py
@@ -152,6 +152,9 @@ def emit(self, record: logging.LogRecord):
     def export_logs(self):
         return copy.deepcopy(self.holder)
 
+    def clean_logs(self):
+        self.holder = defaultdict(list)
+
     def flush(self):
         pass
 
diff --git a/cloudinit/socket.py b/cloudinit/socket.py
new file mode 100644
index 00000000000..7ef19f43798
--- /dev/null
+++ b/cloudinit/socket.py
@@ -0,0 +1,174 @@
+# This file is part of cloud-init. See LICENSE file for license information.
+"""A module for common socket helpers."""
+import logging
+import os
+import socket
+import sys
+import time
+from contextlib import suppress
+
+from cloudinit.settings import DEFAULT_RUN_DIR
+
+LOG = logging.getLogger(__name__)
+
+
+def sd_notify(message: str):
+    """Send a sd_notify message.
+
+    :param message: sd-notify message (must be valid ascii)
+    """
+    socket_path = os.environ.get("NOTIFY_SOCKET", "")
+
+    if not socket_path:
+        # not running under systemd, no-op
+        return
+
+    elif socket_path[0] == "@":
+        # abstract
+        socket_path.replace("@", "\0", 1)
+
+    # unix domain
+    elif socket_path[0] != "/":
+        raise OSError("Unsupported socket type")
+
+    with socket.socket(
+        socket.AF_UNIX, socket.SOCK_DGRAM | socket.SOCK_CLOEXEC
+    ) as sock:
+        LOG.info("Sending sd_notify(%s)", str(message))
+        sock.connect(socket_path)
+        sock.sendall(message.encode("ascii"))
+
+
+class SocketSync:
+    """A two way synchronization protocol over Unix domain sockets."""
+
+    def __init__(self, *names: str):
+        """Initialize a synchronization context.
+
+        1) Ensure that the socket directory exists.
+        2) Bind a socket for each stage.
+
+        Binding the sockets on initialization allows receipt of stage
+        "start" notifications prior to the cloud-init stage being ready to
+        start.
+
+        :param names: stage names, used as a unique identifiers
+        """
+        self.stage = ""
+        self.remote = ""
+        self.first_exception = ""
+        self.systemd_exit_code = 0
+        self.experienced_any_error = False
+        self.sockets = {
+            name: socket.socket(
+                socket.AF_UNIX, socket.SOCK_DGRAM | socket.SOCK_CLOEXEC
+            )
+            for name in names
+        }
+        # ensure the directory exists
+        os.makedirs(f"{DEFAULT_RUN_DIR}/share", mode=0o700, exist_ok=True)
+        # removing stale sockets and bind
+        for name, sock in self.sockets.items():
+            socket_path = f"{DEFAULT_RUN_DIR}/share/{name}.sock"
+            with suppress(FileNotFoundError):
+                os.remove(socket_path)
+            sock.bind(socket_path)
+
+    def __call__(self, stage: str):
+        """Set the stage before entering context.
+
+        This enables the context manager to be initialized separately from
+        each stage synchronization.
+
+        :param stage: the name of a stage to synchronize
+
+        Example:
+            sync = SocketSync("stage 1", "stage 2"):
+            with sync("stage 1"):
+                pass
+            with sync("stage 2"):
+                pass
+        """
+        if stage not in self.sockets:
+            raise ValueError(f"Invalid stage name: {stage}")
+        self.stage = stage
+        return self
+
+    def __enter__(self):
+        """Wait until a message has been received on this stage's socket.
+
+        Once the message has been received, enter the context.
+        """
+        if os.isatty(sys.stdin.fileno()):
+            LOG.info(
+                "Stdin is a tty, so skipping stage synchronization protocol"
+            )
+            return
+        self.systemd_exit_code = 0
+        sd_notify(
+            "STATUS=Waiting on external services to "
+            f"complete before starting the {self.stage} stage."
+        )
+        start_time = time.monotonic()
+        # block until init system sends us data
+        # the first value returned contains a message from the init system
+        #     (should be "start")
+        # the second value contains the path to a unix socket on which to
+        #     reply, which is expected to be /path/to/{self.stage}-return.sock
+        sock = self.sockets[self.stage]
+        chunk, self.remote = sock.recvfrom(5)
+
+        if b"start" != chunk:
+            # The protocol expects to receive a command "start"
+            self.__exit__(None, None, None)
+            raise ValueError(f"Received invalid message: [{str(chunk)}]")
+        elif f"{DEFAULT_RUN_DIR}/share/{self.stage}-return.sock" != str(
+            self.remote
+        ):
+            # assert that the return path is in a directory with appropriate
+            # permissions
+            self.__exit__(None, None, None)
+            raise ValueError(f"Unexpected path to unix socket: {self.remote}")
+
+        total = time.monotonic() - start_time
+        time_msg = f"took {total: .3f}s to " if total > 0.01 else ""
+        sd_notify(f"STATUS=Running ({self.stage} stage)")
+        LOG.debug("sync(%s): synchronization %scomplete", self.stage, time_msg)
+        return self
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        """Notify the socket that this stage is complete."""
+        message = f"Completed socket interaction for boot stage {self.stage}"
+        if exc_type:
+            # handle exception thrown in context
+            self.systemd_exit_code = 1
+            self.experienced_any_error = True
+            status = f"{repr(exc_val)} in {exc_tb.tb_frame}"
+            message = (
+                'fatal error, run "systemctl status cloud-init-main.service" '
+                'and "cloud-init status --long" for more details'
+            )
+            if not self.first_exception:
+                self.first_exception = status
+            LOG.fatal(status)
+            sd_notify(f"STATUS={status}")
+
+        self.experienced_any_error = self.experienced_any_error or bool(
+            self.systemd_exit_code
+        )
+        sock = self.sockets[self.stage]
+        sock.connect(self.remote)
+
+        # the returned message will be executed in a subshell
+        # hardcode this message rather than sending a more informative message
+        # to avoid having to sanitize inputs (to prevent escaping the shell)
+        sock.sendall(
+            f"echo '{message}'; exit {self.systemd_exit_code};".encode()
+        )
+        sock.close()
+
+        # suppress exception - the exception was logged and the init system
+        # notified of stage completion (and the exception received as a status
+        # message). Raising an exception would block the rest of boot, so carry
+        # on in a degraded state.
+        return True
diff --git a/config/cloud.cfg.tmpl b/config/cloud.cfg.tmpl
index 4b1efdbcbf1..bc3e6067ec4 100644
--- a/config/cloud.cfg.tmpl
+++ b/config/cloud.cfg.tmpl
@@ -62,7 +62,7 @@ disable_root: true
                    "openmandriva", "photon", "TencentOS"] or is_rhel %}
 
 {% if is_rhel %}
-mount_default_fields: [~, ~, 'auto', 'defaults,nofail,x-systemd.after=cloud-init.service,_netdev', '0', '2']
+mount_default_fields: [~, ~, 'auto', 'defaults,nofail,x-systemd.after=cloud-init-network.service,_netdev', '0', '2']
 {% else %}
 mount_default_fields: [~, ~, 'auto', 'defaults,nofail', '0', '2']
 {% endif %}
diff --git a/doc/module-docs/cc_mounts/data.yaml b/doc/module-docs/cc_mounts/data.yaml
index 751b301d501..18193f062d3 100644
--- a/doc/module-docs/cc_mounts/data.yaml
+++ b/doc/module-docs/cc_mounts/data.yaml
@@ -18,7 +18,7 @@ cc_mounts:
     .. code-block:: yaml
 
        mounts:
-       - ["ephemeral0", "/mnt", "auto", "defaults,nofail,x-systemd.after=cloud-init.service", "0", "2"]
+       - ["ephemeral0", "/mnt", "auto", "defaults,nofail,x-systemd.after=cloud-init-network.service", "0", "2"]
        - ["swap", "none", "swap", "sw", "0", "0"]
 
     In order to remove a previously-listed mount, an entry can be added to the
@@ -32,7 +32,7 @@ cc_mounts:
 
     .. code-block:: yaml
 
-       mount_default_fields: [none, none, "auto", "defaults,nofail,x-systemd.after=cloud-init.service", "0", "2"]
+       mount_default_fields: [none, none, "auto", "defaults,nofail,x-systemd.after=cloud-init-network.service", "0", "2"]
 
     Non-systemd init systems will vary in ``mount_default_fields``.
 
diff --git a/doc/rtd/explanation/boot.rst b/doc/rtd/explanation/boot.rst
index a975ca7a093..ff3b65ebd28 100644
--- a/doc/rtd/explanation/boot.rst
+++ b/doc/rtd/explanation/boot.rst
@@ -108,7 +108,7 @@ Network
 =======
 
 +------------------+----------------------------------------------------------+
-| systemd service  | ``cloud-init.service``                                   |
+| systemd service  | ``cloud-init-network.service``                           |
 +---------+--------+----------------------------------------------------------+
 | runs             | after local stage and configured networking is up        |
 +---------+--------+----------------------------------------------------------+
diff --git a/doc/rtd/howto/debugging.rst b/doc/rtd/howto/debugging.rst
index c8b2a2634bc..546e8dd9f45 100644
--- a/doc/rtd/howto/debugging.rst
+++ b/doc/rtd/howto/debugging.rst
@@ -55,7 +55,7 @@ Cloud-init did not run
 
    .. code-block::
 
-      systemctl status cloud-init-local.service cloud-init.service\
+      systemctl status cloud-init-local.service cloud-init-network.service\
          cloud-config.service cloud-final.service
 
    Cloud-init may have started to run, but not completed. This shows how many,
diff --git a/packages/redhat/cloud-init.spec.in b/packages/redhat/cloud-init.spec.in
index bc57fe9aac9..672cd426673 100644
--- a/packages/redhat/cloud-init.spec.in
+++ b/packages/redhat/cloud-init.spec.in
@@ -124,7 +124,7 @@ if [ $1 -eq 1 ]
 then
     /bin/systemctl enable cloud-config.service     >/dev/null 2>&1 || :
     /bin/systemctl enable cloud-final.service      >/dev/null 2>&1 || :
-    /bin/systemctl enable cloud-init.service       >/dev/null 2>&1 || :
+    /bin/systemctl enable cloud-init-network.service       >/dev/null 2>&1 || :
     /bin/systemctl enable cloud-init-local.service >/dev/null 2>&1 || :
 fi
 %else
@@ -141,7 +141,7 @@ if [ $1 -eq 0 ]
 then
     /bin/systemctl --no-reload disable cloud-config.service >/dev/null 2>&1 || :
     /bin/systemctl --no-reload disable cloud-final.service  >/dev/null 2>&1 || :
-    /bin/systemctl --no-reload disable cloud-init.service   >/dev/null 2>&1 || :
+    /bin/systemctl --no-reload disable cloud-init-network.service   >/dev/null 2>&1 || :
     /bin/systemctl --no-reload disable cloud-init-local.service >/dev/null 2>&1 || :
 fi
 %else
diff --git a/systemd/cloud-config.service.tmpl b/systemd/cloud-config.service.tmpl
index 79c75c71ae6..9067d6e4bc0 100644
--- a/systemd/cloud-config.service.tmpl
+++ b/systemd/cloud-config.service.tmpl
@@ -10,7 +10,14 @@ ConditionEnvironment=!KERNEL_CMDLINE=cloud-init=disabled
 
 [Service]
 Type=oneshot
-ExecStart=/usr/bin/cloud-init modules --mode=config
+# This service is a shim which preserves systemd ordering while allowing a
+# single Python process to run cloud-init's logic. This works by communicating
+# with the cloud-init process over a unix socket to tell the process that this
+# stage can start, and then wait on a return socket until the cloud-init
+# process has completed this stage. The output from the return socket is piped
+# into a shell so that the process can send a completion message (defaults to
+# "done", otherwise includes an error message) and an exit code to systemd.
+ExecStart=sh -c 'echo "start" | nc.openbsd -Uu -W1 /run/cloud-init/share/config.sock -s /run/cloud-init/share/config-return.sock | sh'
 RemainAfterExit=yes
 TimeoutSec=0
 
diff --git a/systemd/cloud-config.target b/systemd/cloud-config.target
index 2d65e3433ce..be754bbd19d 100644
--- a/systemd/cloud-config.target
+++ b/systemd/cloud-config.target
@@ -14,5 +14,5 @@
 
 [Unit]
 Description=Cloud-config availability
-Wants=cloud-init-local.service cloud-init.service
-After=cloud-init-local.service cloud-init.service
+Wants=cloud-init-local.service cloud-init-network.service
+After=cloud-init-local.service cloud-init-network.service
diff --git a/systemd/cloud-final.service.tmpl b/systemd/cloud-final.service.tmpl
index b66533643d3..9fb2f681f73 100644
--- a/systemd/cloud-final.service.tmpl
+++ b/systemd/cloud-final.service.tmpl
@@ -15,10 +15,16 @@ ConditionEnvironment=!KERNEL_CMDLINE=cloud-init=disabled
 
 [Service]
 Type=oneshot
-ExecStart=/usr/bin/cloud-init modules --mode=final
+# This service is a shim which preserves systemd ordering while allowing a
+# single Python process to run cloud-init's logic. This works by communicating
+# with the cloud-init process over a unix socket to tell the process that this
+# stage can start, and then wait on a return socket until the cloud-init
+# process has completed this stage. The output from the return socket is piped
+# into a shell so that the process can send a completion message (defaults to
+# "done", otherwise includes an error message) and an exit code to systemd.
+ExecStart=sh -c 'echo "start" | nc.openbsd -Uu -W1 /run/cloud-init/share/final.sock -s /run/cloud-init/share/final-return.sock | sh'
 RemainAfterExit=yes
 TimeoutSec=0
-KillMode=process
 {% if variant in ["almalinux", "cloudlinux", "rhel"] %}
 # Restart NetworkManager if it is present and running.
 ExecStartPost=/bin/sh -c 'u=NetworkManager.service; \
diff --git a/systemd/cloud-init-local.service.tmpl b/systemd/cloud-init-local.service.tmpl
index 0da2d8337e9..b0a534b8f9a 100644
--- a/systemd/cloud-init-local.service.tmpl
+++ b/systemd/cloud-init-local.service.tmpl
@@ -7,7 +7,6 @@ DefaultDependencies=no
 {% endif %}
 Wants=network-pre.target
 After=hv_kvp_daemon.service
-After=systemd-remount-fs.service
 {% if variant in ["almalinux", "cloudlinux", "rhel"] %}
 Requires=dbus.socket
 After=dbus.socket
@@ -38,7 +37,14 @@ ExecStartPre=/bin/mkdir -p /run/cloud-init
 ExecStartPre=/sbin/restorecon /run/cloud-init
 ExecStartPre=/usr/bin/touch /run/cloud-init/enabled
 {% endif %}
-ExecStart=/usr/bin/cloud-init init --local
+# This service is a shim which preserves systemd ordering while allowing a
+# single Python process to run cloud-init's logic. This works by communicating
+# with the cloud-init process over a unix socket to tell the process that this
+# stage can start, and then wait on a return socket until the cloud-init
+# process has completed this stage. The output from the return socket is piped
+# into a shell so that the process can send a completion message (defaults to
+# "done", otherwise includes an error message) and an exit code to systemd.
+ExecStart=sh -c 'echo "start" | nc.openbsd -Uu -W1 /run/cloud-init/share/local.sock -s /run/cloud-init/share/local-return.sock | sh'
 RemainAfterExit=yes
 TimeoutSec=0
 
diff --git a/systemd/cloud-init-main.service.tmpl b/systemd/cloud-init-main.service.tmpl
new file mode 100644
index 00000000000..1ddfd62073e
--- /dev/null
+++ b/systemd/cloud-init-main.service.tmpl
@@ -0,0 +1,52 @@
+## template:jinja
+# systemd ordering resources
+# ==========================
+# https://systemd.io/NETWORK_ONLINE/
+# https://docs.cloud-init.io/en/latest/explanation/boot.html
+# https://www.freedesktop.org/wiki/Software/systemd/NetworkTarget/
+# https://www.freedesktop.org/software/systemd/man/latest/systemd.special.html
+# https://www.freedesktop.org/software/systemd/man/latest/systemd-remount-fs.service.html
+[Unit]
+Description=Cloud-init: Single Process
+Wants=network-pre.target
+{% if variant in ["almalinux", "cloudlinux", "ubuntu", "unknown", "debian", "rhel"] %}
+DefaultDependencies=no
+{% endif %}
+{% if variant in ["almalinux", "cloudlinux", "rhel"] %}
+Requires=dbus.socket
+After=dbus.socket
+Before=network.service
+Before=firewalld.target
+Conflicts=shutdown.target
+{% endif %}
+{% if variant in ["ubuntu", "unknown", "debian"] %}
+Before=sysinit.target
+Conflicts=shutdown.target
+{% endif %}
+
+After=systemd-remount-fs.service
+Before=sysinit.target
+Before=cloud-init-local.service
+Conflicts=shutdown.target
+RequiresMountsFor=/var/lib/cloud
+ConditionPathExists=!/etc/cloud/cloud-init.disabled
+ConditionKernelCommandLine=!cloud-init=disabled
+ConditionEnvironment=!KERNEL_CMDLINE=cloud-init=disabled
+
+[Service]
+Type=notify
+ExecStart=/usr/bin/cloud-init --all-stages
+KillMode=process
+TasksMax=infinity
+TimeoutStartSec=infinity
+{% if variant in ["almalinux", "cloudlinux", "rhel"] %}
+ExecStartPre=/bin/mkdir -p /run/cloud-init
+ExecStartPre=/sbin/restorecon /run/cloud-init
+ExecStartPre=/usr/bin/touch /run/cloud-init/enabled
+{% endif %}
+
+# Output needs to appear in instance console output
+StandardOutput=journal+console
+
+[Install]
+WantedBy=cloud-init.target
diff --git a/systemd/cloud-init.service.tmpl b/systemd/cloud-init-network.service.tmpl
similarity index 71%
rename from systemd/cloud-init.service.tmpl
rename to systemd/cloud-init-network.service.tmpl
index 58031cc4331..6957b39f1ee 100644
--- a/systemd/cloud-init.service.tmpl
+++ b/systemd/cloud-init-network.service.tmpl
@@ -46,7 +46,14 @@ ConditionEnvironment=!KERNEL_CMDLINE=cloud-init=disabled
 
 [Service]
 Type=oneshot
-ExecStart=/usr/bin/cloud-init init
+# This service is a shim which preserves systemd ordering while allowing a
+# single Python process to run cloud-init's logic. This works by communicating
+# with the cloud-init process over a unix socket to tell the process that this
+# stage can start, and then wait on a return socket until the cloud-init
+# process has completed this stage. The output from the return socket is piped
+# into a shell so that the process can send a completion message (defaults to
+# "done", otherwise includes an error message) and an exit code to systemd.
+ExecStart=sh -c 'echo "start" | nc.openbsd -Uu -W1 /run/cloud-init/share/network.sock -s /run/cloud-init/share/network-return.sock | sh'
 RemainAfterExit=yes
 TimeoutSec=0
 
diff --git a/tests/integration_tests/assets/enable_coverage.py b/tests/integration_tests/assets/enable_coverage.py
index ed71ceef8f5..1d18fcbef04 100644
--- a/tests/integration_tests/assets/enable_coverage.py
+++ b/tests/integration_tests/assets/enable_coverage.py
@@ -2,7 +2,7 @@
 
 services = [
     "cloud-init-local.service",
-    "cloud-init.service",
+    "cloud-init-network.service",
     "cloud-config.service",
     "cloud-final.service",
 ]
diff --git a/tests/integration_tests/assets/enable_profile.py b/tests/integration_tests/assets/enable_profile.py
index a6a0070c3c5..9b68e42ce05 100644
--- a/tests/integration_tests/assets/enable_profile.py
+++ b/tests/integration_tests/assets/enable_profile.py
@@ -2,7 +2,7 @@
 
 services = [
     "cloud-init-local.service",
-    "cloud-init.service",
+    "cloud-init-network.service",
     "cloud-config.service",
     "cloud-final.service",
 ]
diff --git a/tests/integration_tests/conftest.py b/tests/integration_tests/conftest.py
index c3b8531ae92..8ba5a81b2b5 100644
--- a/tests/integration_tests/conftest.py
+++ b/tests/integration_tests/conftest.py
@@ -191,7 +191,7 @@ def _collect_profile(instance: IntegrationInstance, log_dir: Path):
             log_dir / "profile" / "local.stats",
         )
         instance.pull_file(
-            "/var/log/cloud-init.service.stats",
+            "/var/log/cloud-init-network.service.stats",
             log_dir / "profile" / "network.stats",
         )
         instance.pull_file(
diff --git a/tests/integration_tests/datasources/test_nocloud.py b/tests/integration_tests/datasources/test_nocloud.py
index 24aecc0bd8d..c3462c433a3 100644
--- a/tests/integration_tests/datasources/test_nocloud.py
+++ b/tests/integration_tests/datasources/test_nocloud.py
@@ -162,7 +162,7 @@ def test_smbios_seed_network(self, client: IntegrationInstance):
                 """\
                 [Unit]
                 Description=Serve a local webserver
-                Before=cloud-init.service
+                Before=cloud-init-network.service
                 Wants=cloud-init-local.service
                 DefaultDependencies=no
                 After=systemd-networkd-wait-online.service
@@ -354,7 +354,7 @@ def _boot_with_cmdline(
                 # and NoCloud operates in network timeframe
                 After=systemd-networkd-wait-online.service
                 After=networking.service
-                Before=cloud-init.service
+                Before=cloud-init-network.service
 
                 [Service]
                 Type=exec
diff --git a/tests/unittests/cmd/test_main.py b/tests/unittests/cmd/test_main.py
index f9b3faab130..bad728f2a72 100644
--- a/tests/unittests/cmd/test_main.py
+++ b/tests/unittests/cmd/test_main.py
@@ -13,7 +13,9 @@
 from cloudinit.util import ensure_dir, load_text_file, write_file
 from tests.unittests.helpers import FilesystemMockingTestCase, wrap_and_call
 
-MyArgs = namedtuple("MyArgs", "debug files force local reporter subcommand")
+MyArgs = namedtuple(
+    "MyArgs", "debug files force local reporter subcommand skip_log_setup"
+)
 
 
 class TestMain(FilesystemMockingTestCase):
@@ -76,6 +78,7 @@ def test_main_init_run_net_runs_modules(self):
             local=False,
             reporter=None,
             subcommand="init",
+            skip_log_setup=False,
         )
         (_item1, item2) = wrap_and_call(
             "cloudinit.cmd.main",
@@ -122,6 +125,7 @@ def test_main_init_run_net_calls_set_hostname_when_metadata_present(self):
             local=False,
             reporter=None,
             subcommand="init",
+            skip_log_setup=False,
         )
 
         def set_hostname(name, cfg, cloud, args):
diff --git a/tests/unittests/config/test_cc_mounts.py b/tests/unittests/config/test_cc_mounts.py
index 9982b6741c6..7e85987b744 100644
--- a/tests/unittests/config/test_cc_mounts.py
+++ b/tests/unittests/config/test_cc_mounts.py
@@ -565,9 +565,9 @@ def test_fstab_mounts_combinations(self):
             LABEL=keepme	none	ext4	defaults	0	0
             LABEL=UEFI
             /dev/sda4	/mnt2	auto	nofail,comment=cloudconfig	1	2
-            /dev/sda5	/mnt3	auto	defaults,nofail,x-systemd.after=cloud-init.service,_netdev,comment=cloudconfig	0	2
+            /dev/sda5	/mnt3	auto	defaults,nofail,x-systemd.after=cloud-init-network.service,_netdev,comment=cloudconfig	0	2
             /dev/sda1	/mnt	xfs	auto,comment=cloudconfig	0	2
-            /dev/sda3	/mnt4	btrfs	defaults,nofail,x-systemd.after=cloud-init.service,_netdev,comment=cloudconfig	0	2
+            /dev/sda3	/mnt4	btrfs	defaults,nofail,x-systemd.after=cloud-init-network.service,_netdev,comment=cloudconfig	0	2
             /dev/sdb1	none	swap	sw,comment=cloudconfig	0	0
             """  # noqa: E501
             ).strip()
diff --git a/tests/unittests/test_all_stages.py b/tests/unittests/test_all_stages.py
new file mode 100644
index 00000000000..90bde5e1add
--- /dev/null
+++ b/tests/unittests/test_all_stages.py
@@ -0,0 +1,208 @@
+import random
+import signal
+import socket
+import time
+from threading import Thread
+from unittest import mock
+
+from cloudinit import socket as ci_socket
+
+
+class Sync:
+    """A device to send and receive synchronization messages
+
+    Creating an instance of the device sends a b"start"
+    """
+
+    def __init__(self, name: str, path: str):
+        self.sock = socket.socket(socket.AF_UNIX, socket.SOCK_DGRAM)
+        self.sock.connect(f"{path}/share/{name}.sock")
+        self.sock.bind(f"{path}/share/{name}-return.sock")
+        self.sock.sendall(b"start")
+
+    def receive(self):
+        """receive 5 bytes from the socket"""
+        received = self.sock.recv(4096)
+        self.sock.close()
+        return received
+
+
+class Timeout:
+    """A utility which may be used to verify that a timeout occurs
+
+    TimeoutError is raised on successful timeout.
+
+    Create a signal handler and use signal.alarm to verify that the
+    timeout occured.
+    """
+
+    def handle_timeout(self, *_):
+        raise TimeoutError()
+
+    def __enter__(self):
+        signal.signal(signal.SIGALRM, self.handle_timeout)
+        # 1 second is, unfortunately, the minimum
+        signal.alarm(1)
+
+    def __exit__(self, *_):
+        signal.alarm(0)
+
+
+def test_all_stages_times_out(tmp_path):
+    """Verify that no "start" makes the protocol block"""
+    with mock.patch.object(
+        ci_socket, "DEFAULT_RUN_DIR", tmp_path
+    ), mock.patch.object(ci_socket, "sd_notify"), mock.patch.object(
+        ci_socket.os, "isatty", return_value=False
+    ), mock.patch.object(
+        ci_socket.sys.stdin, "fileno"
+    ):
+        sync = ci_socket.SocketSync("first")
+
+        try:
+            with Timeout():
+                # this should block for 1 second
+                with sync("first"):
+                    pass
+        except TimeoutError:
+            # success is a timeout
+            pass
+        else:
+            raise AssertionError("Expected the thing to timeout!")
+
+
+def test_all_stages(tmp_path):
+    """Verify that a socket can store "start" messages
+
+    After a socket has been been bound but before it has started listening
+    """
+    expected = "echo 'Completed socket interaction for boot stage {}'; exit 0;"
+    with mock.patch.object(
+        ci_socket, "DEFAULT_RUN_DIR", tmp_path
+    ), mock.patch.object(ci_socket, "sd_notify"), mock.patch.object(
+        ci_socket.os, "isatty", return_value=False
+    ), mock.patch.object(
+        ci_socket.sys.stdin, "fileno"
+    ):
+        sync = ci_socket.SocketSync("first", "second", "third")
+
+        # send all three syncs to the sockets
+        first = Sync("first", tmp_path)
+        second = Sync("second", tmp_path)
+        third = Sync("third", tmp_path)
+
+        # "wait" on the first sync event
+        with sync("first"):
+            pass
+
+        # check that the first sync returned
+        assert expected.format("first").encode() == first.receive()
+        # "wait" on the second sync event
+        with sync("second"):
+            pass
+        # check that the second sync returned
+        assert expected.format("second").encode() == second.receive()
+        # "wait" on the third sync event
+        with sync("third"):
+            pass
+        # check that the third sync returned
+        assert expected.format("third").encode() == third.receive()
+
+
+def test_all_stages_threaded(tmp_path):
+    """Verify that arbitrary "start" order works"""
+
+    # in milliseconds
+    max_sleep = 100
+    # initialize random number generator
+    random.seed(time.time())
+    expected = "echo 'Completed socket interaction for boot stage {}'; exit 0;"
+    sync_storage = {}
+
+    def syncer(index: int, name: str):
+        """sleep for 0-100ms then send a sync notification
+
+        this allows sync order to be arbitrary
+        """
+        time.sleep(0.001 * random.randint(0, max_sleep))
+        sync_storage[index] = Sync(name, tmp_path)
+
+    with mock.patch.object(
+        ci_socket, "DEFAULT_RUN_DIR", tmp_path
+    ), mock.patch.object(ci_socket, "sd_notify"), mock.patch.object(
+        ci_socket.os, "isatty", return_value=False
+    ), mock.patch.object(
+        ci_socket.sys.stdin, "fileno"
+    ):
+
+        sync = ci_socket.SocketSync(
+            "first", "second", "third", "fourth", "fifth"
+        )
+
+        for i, name in {
+            1: "first",
+            2: "second",
+            3: "third",
+            4: "fourth",
+            5: "fifth",
+        }.items():
+            t = Thread(target=syncer, args=(i, name))
+            t.run()
+
+        # wait on the first sync event
+        with sync("first"):
+            pass
+
+        # check that the first sync returned
+        assert expected.format("first").encode() == sync_storage[1].receive()
+
+        # wait on the second sync event
+        with sync("second"):
+            pass
+
+        # check that the second sync returned
+        assert expected.format("second").encode() == sync_storage[2].receive()
+
+        # wait on the third sync event
+        with sync("third"):
+            pass
+
+        # check that the third sync returned
+        assert expected.format("third").encode() == sync_storage[3].receive()
+        with sync("fourth"):
+            pass
+
+        # check that the fourth sync returned
+        assert expected.format("fourth").encode() == sync_storage[4].receive()
+
+        with sync("fifth"):
+            pass
+
+        # check that the fifth sync returned
+        assert expected.format("fifth").encode() == sync_storage[5].receive()
+
+
+def test_all_stages_exception(tmp_path):
+    """Verify that exceptions log messages produce a valid warning message"""
+    with mock.patch.object(
+        ci_socket, "DEFAULT_RUN_DIR", tmp_path
+    ), mock.patch.object(ci_socket, "sd_notify"), mock.patch.object(
+        ci_socket.os, "isatty", return_value=False
+    ), mock.patch.object(
+        ci_socket.sys.stdin, "fileno"
+    ):
+        sync = ci_socket.SocketSync("first", "second", "third")
+
+        # send all three syncs to the sockets
+        first = Sync("first", tmp_path)
+
+        # "wait" on the first sync event
+        with sync("first"):
+            # verify that an exception in context doesn't raise
+            1 / 0  # pylint: disable=W0104
+
+        assert (
+            b"echo 'fatal error, run \"systemctl status cloud-init-main."
+            b'service" and "cloud-init status --long" for '
+            b"more details'; exit 1;" == first.receive()
+        )
diff --git a/tests/unittests/test_cli.py b/tests/unittests/test_cli.py
index 6ab6d496b16..a7c3b1ba38b 100644
--- a/tests/unittests/test_cli.py
+++ b/tests/unittests/test_cli.py
@@ -160,9 +160,7 @@ def test_no_arguments_shows_usage(self, capsys):
 
     def test_no_arguments_shows_error_message(self, capsys):
         exit_code = self._call_main()
-        missing_subcommand_message = (
-            "the following arguments are required: subcommand"
-        )
+        missing_subcommand_message = "a subcommand is required"
         _out, err = capsys.readouterr()
         assert (
             missing_subcommand_message in err