init/upstart/journald.conf

# Copyright 2018 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

description      "systemd-journald"
author           "chromium-os-dev@chromium.org"

start on starting boot-services
stop on stopping boot-services

expect fork
respawn

pre-start script
  # File mode includes group write permission to allow rsyslogd to create its
  # socket. The directory group is root; syslog starts as root, and only after
  # initialization switches to the syslog user.
  mkdir -m 0775 -p /run/systemd/journal
  mkdir -p /run/systemd/journal/pids

  chown -R syslog /run/systemd/journal

  mkdir -p /run/log
  chown syslog /run/log

  ln -sf /run/systemd/journal/dev-log /dev/log
end script

# Upstart has limitation on how it can track daemon readiness.  See this report
# for more details: https://crbug.com/702794#27. net_poll_tool allows us to
# emit the started event only after the socket is ready.
# /run/systemd/journal/socket is the last socket created by journald.
#
# We don't use a pid namespace because it breaks journald's ability to log the
# remote pid. We don't use a network namespace because journald needs to read
# from the audit netlink socket.
#
# CAP_SYS_PTRACE is required to read /proc/<PID>/exe.
# We aren't going to give that capability to journald due to security concerns.
exec minijail0 -T static --ambient \
               -u syslog -g syslog -c 'cap_syslog,cap_audit_read+e' \
               -i -l --uts -f /run/systemd-journald.pid \
               -v -P /mnt/empty -b / -b /proc -t -r --mount-dev \
               -b /dev/kmsg,,1 \
               -k 'run,/run,tmpfs,MS_NOSUID|MS_NODEV|MS_NOEXEC' \
               -b /run/systemd,,1 \
               -b /run/log,,1 \
               -k 'var,/var,tmpfs,MS_NOSUID|MS_NODEV|MS_NOEXEC' \
               -b /var/log,,1 \
                /usr/lib/systemd/systemd-journald

post-start script
  # The timeout is high, but it should never be hit unless there's a serious
  # problem, in which case we want to fall over anyways.  We can't set it too
  # low because we also run in slow environments like VMs.
  net_poll_tool --timeout=60 --unix_socket=/run/systemd/journal/socket

  # This is needed to flush the journal to persistent storage
  pkill -SIGUSR1 --pidfile /run/systemd-journald.pid
end script

post-stop script
  rm /dev/log || true
  rm /run/systemd-journald.pid || true
end script