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[Hayjumper <1301015@xxxxxxxxxxxxxxxxxx>]

The command in comment #8 *should* do this in a single exec resource:

sudo ifdown --exclude=lo -a && sudo ifup --exclude=lo -a

However, I have found this does not actually work either for any
significant config change (e.g. IP address change, gateway change).  In
fact, the command above frequently causes networking to stop working in
such cases.

The only way I've found that works is to reboot the server;
NetworkManager is not an option when doing text-based network config.
Other distros using upstart do not seem to have this problem.  It's a
shame that Canonical hasn't seen fit to address this, and its cost them
my employer's (albeit meager) support budget.

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https://bugs.launchpad.net/bugs/1301015

Title:
  Networking does not restart

Status in ifupdown package in Ubuntu:
  Confirmed

Bug description:
  In Ubuntu Server 14.04 it appears it is not possible to restart
  networking. This is fresh install from ISO.

  wirehive@ubuntu:~$ sudo /etc/init.d/networking restart
  wirehive@ubuntu:~$ echo $?
  1
  wirehive@ubuntu:~$ sudo service networking restart
  stop: Job failed while stopping
  start: Job is already running: networking
  wirehive@ubuntu:~$ sudo bash -x /etc/init.d/networking restart
  + PATH=/sbin:/bin
  + RUN_DIR=/run/network
  + IFSTATE=/run/network/ifstate
  + STATEDIR=/run/network/state
  + '[' -x /sbin/ifup ']'
  + '[' -x /sbin/ifdown ']'
  + . /lib/lsb/init-functions
  +++ run-parts --lsbsysinit --list /lib/lsb/init-functions.d
  ++ for hook in '$(run-parts --lsbsysinit --list /lib/lsb/init-functions.d 2>/dev/null)'
  ++ '[' -r /lib/lsb/init-functions.d/20-left-info-blocks ']'
  ++ . /lib/lsb/init-functions.d/20-left-info-blocks
  ++ for hook in '$(run-parts --lsbsysinit --list /lib/lsb/init-functions.d 2>/dev/null)'
  ++ '[' -r /lib/lsb/init-functions.d/50-ubuntu-logging ']'
  ++ . /lib/lsb/init-functions.d/50-ubuntu-logging
  +++ LOG_DAEMON_MSG=
  ++ FANCYTTY=
  ++ '[' -e /etc/lsb-base-logging.sh ']'
  ++ true
  + CONFIGURE_INTERFACES=yes
  + EXCLUDE_INTERFACES=
  + VERBOSE=no
  + '[' -f /etc/default/networking ']'
  + verbose=
  + '[' no = yes ']'
  + case "$1" in
  + init_is_upstart
  + '[' -x /sbin/initctl ']'
  + /bin/grep -q upstart
  + /sbin/initctl version
  + return 0
  + exit 1
  wirehive@ubuntu:~$ sudo bash -x service networking restart
  ++ basename service
  + VERSION='service ver. 0.91-ubuntu1'
  ++ basename service
  + USAGE='Usage: service < option > | --status-all | [ service_name [ command | --full-restart ] ]'
  + SERVICE=
  + ACTION=
  + SERVICEDIR=/etc/init.d
  + OPTIONS=
  + '[' 2 -eq 0 ']'
  + cd /
  + '[' 2 -gt 0 ']'
  + case "${1}" in
  + '[' -z '' -a 2 -eq 1 -a networking = --status-all ']'
  + '[' 2 -eq 2 -a restart = --full-restart ']'
  + '[' -z '' ']'
  + SERVICE=networking
  + shift
  + '[' 1 -gt 0 ']'
  + case "${1}" in
  + '[' -z networking -a 1 -eq 1 -a restart = --status-all ']'
  + '[' 1 -eq 2 -a '' = --full-restart ']'
  + '[' -z networking ']'
  + '[' -z '' ']'
  + ACTION=restart
  + shift
  + '[' 0 -gt 0 ']'
  + '[' -r /etc/init/networking.conf ']'
  + which initctl
  + grep -q upstart
  + initctl version
  + case "${ACTION}" in
  + stop networking
  stop: Job failed while stopping
  + :
  + exec start networking
  start: Job is already running: networking
  wirehive@ubuntu:~$

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