Re: [Bug 925511] Re: lxc init script should fail when it ... failed

2012-02-08 Thread Ritesh Raj Sarraf
On Wednesday 08 February 2012 03:54 AM, Serge Hallyn wrote:
 @Ritesh,

 Unfortunately I don't know that that many people would read the README :)
 It is worth adding though, thanks for the suggestion.

 In addition, I will add an LXC section to the ubuntu server guide soon,
 and this should be mentioned there.

 I'm also marking this (and the equivalent libvirt) bugs as affecting
 dnsmasq.  Perhaps we can do something to its default configuration to be
 less belligerant.  Maybe even just an explicit
 '--except-interface=virbr0,lxcbr0', though hard-coding that seems a bit
 ugly.

Serge,

IMO the better option would be to just ship a binder in /etc/dnsmasq.d/

dnsmasq is a personal dns caching service. I doubt if anyone is using it
as a bind replacement.

By shipping a dnsmasq sub conf file (and making it bind to loopback
only), you eliminate the need to track the list of virtual bridges.
Then, you also don't need to spawn off your own dnsmasq proc from the
lxc init script.

-- 
Ritesh Raj Sarraf | http://people.debian.org/~rrs
Debian - The Universal Operating System

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Title:
  lxc init script should fail when it ... failed

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Re: [Bug 925511] Re: lxc init script should fail when it ... failed

2012-02-08 Thread Simon Kelley
On 08/02/12 08:33, Ritesh Raj Sarraf wrote:
 On Wednesday 08 February 2012 03:54 AM, Serge Hallyn wrote:
 @Ritesh,

 Unfortunately I don't know that that many people would read the README :)
 It is worth adding though, thanks for the suggestion.

 In addition, I will add an LXC section to the ubuntu server guide soon,
 and this should be mentioned there.

 I'm also marking this (and the equivalent libvirt) bugs as affecting
 dnsmasq.  Perhaps we can do something to its default configuration to be
 less belligerant.  Maybe even just an explicit
 '--except-interface=virbr0,lxcbr0', though hard-coding that seems a bit
 ugly.

 Serge,

 IMO the better option would be to just ship a binder in /etc/dnsmasq.d/

 dnsmasq is a personal dns caching service. I doubt if anyone is using it
 as a bind replacement.

 By shipping a dnsmasq sub conf file (and making it bind to loopback
 only), you eliminate the need to track the list of virtual bridges.
 Then, you also don't need to spawn off your own dnsmasq proc from the
 lxc init script.


There is special provision in dnsmasq to do exactly this, but it's never 
made it into libvirt upstream. Please feel free to push there!

from man dnsmasq NOTES section:

--
dhcp-range  may  have  an  interface  name supplied as 
interface:interface-name. The semantics if this are as follows: For 
DHCP, if any other dhcp-range exists _without_ an interface name, then 
the interface name is ignored and and  dnsmasq  behaves as  if  the 
interface parts did not exist, otherwise DHCP is only provided to 
interfaces mentioned in dhcp-range declarations. For DNS, if there are 
no --interface or --listen-address flags, behaviour is unchanged by the 
interface  part.  If  either  of these flags are present, the interfaces 
mentioned in dhcp-ranges are added to the set which get DNS service.

Similarly, enable-tftp may take an interface name, which enables TFTP 
only for a particular interface, ignoring --interface or 
--listen-address flags. In addition --tftp-secure and --tftp-unique-root 
and --tftp-no-blocksize are ignored for requests from such interfaces. 
(A --tftp-root directive giving a root path and an interface should be 
provided too.)

These   rules   may   seem   odd   at   first   sight,  but   they 
allow  a  single  line   of  the  form
dhcp-range=interface:virt0,192.168.0.4,192.168.0.200 to be added to 
dnsmasq configuration which then supplies DHCP and DNS services  to 
that interface,  without  affecting  what  services  are  supplied to 
other interfaces and irrespective of the existance or lack of 
interface=interface lines elsewhere in the dnsmasq configuration. 
enable-tftp=virt0 and tftp-root=root,virt0 do the same job for TFTP.

The  idea is that such a line can be added automatically by libvirt or 
equivalent systems, without disturbing any manual configuration.
---


Cheers,

Simon.

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Title:
  lxc init script should fail when it ... failed

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[Bug 925511] Re: lxc init script should fail when it ... failed

2012-02-08 Thread Serge Hallyn
Thanks Ritesh and Simon, sounds like a great idea.

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Re: [Bug 925511] Re: lxc init script should fail when it ... failed

2012-02-08 Thread Ritesh Raj Sarraf
On Wednesday 08 February 2012 03:54 AM, Serge Hallyn wrote:
 @Ritesh,

 Unfortunately I don't know that that many people would read the README :)
 It is worth adding though, thanks for the suggestion.

 In addition, I will add an LXC section to the ubuntu server guide soon,
 and this should be mentioned there.

 I'm also marking this (and the equivalent libvirt) bugs as affecting
 dnsmasq.  Perhaps we can do something to its default configuration to be
 less belligerant.  Maybe even just an explicit
 '--except-interface=virbr0,lxcbr0', though hard-coding that seems a bit
 ugly.

Serge,

IMO the better option would be to just ship a binder in /etc/dnsmasq.d/

dnsmasq is a personal dns caching service. I doubt if anyone is using it
as a bind replacement.

By shipping a dnsmasq sub conf file (and making it bind to loopback
only), you eliminate the need to track the list of virtual bridges.
Then, you also don't need to spawn off your own dnsmasq proc from the
lxc init script.

-- 
Ritesh Raj Sarraf | http://people.debian.org/~rrs
Debian - The Universal Operating System

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Title:
  lxc init script should fail when it ... failed

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Re: [Bug 925511] Re: lxc init script should fail when it ... failed

2012-02-08 Thread Simon Kelley
On 08/02/12 08:33, Ritesh Raj Sarraf wrote:
 On Wednesday 08 February 2012 03:54 AM, Serge Hallyn wrote:
 @Ritesh,

 Unfortunately I don't know that that many people would read the README :)
 It is worth adding though, thanks for the suggestion.

 In addition, I will add an LXC section to the ubuntu server guide soon,
 and this should be mentioned there.

 I'm also marking this (and the equivalent libvirt) bugs as affecting
 dnsmasq.  Perhaps we can do something to its default configuration to be
 less belligerant.  Maybe even just an explicit
 '--except-interface=virbr0,lxcbr0', though hard-coding that seems a bit
 ugly.

 Serge,

 IMO the better option would be to just ship a binder in /etc/dnsmasq.d/

 dnsmasq is a personal dns caching service. I doubt if anyone is using it
 as a bind replacement.

 By shipping a dnsmasq sub conf file (and making it bind to loopback
 only), you eliminate the need to track the list of virtual bridges.
 Then, you also don't need to spawn off your own dnsmasq proc from the
 lxc init script.


There is special provision in dnsmasq to do exactly this, but it's never 
made it into libvirt upstream. Please feel free to push there!

from man dnsmasq NOTES section:

--
dhcp-range  may  have  an  interface  name supplied as 
interface:interface-name. The semantics if this are as follows: For 
DHCP, if any other dhcp-range exists _without_ an interface name, then 
the interface name is ignored and and  dnsmasq  behaves as  if  the 
interface parts did not exist, otherwise DHCP is only provided to 
interfaces mentioned in dhcp-range declarations. For DNS, if there are 
no --interface or --listen-address flags, behaviour is unchanged by the 
interface  part.  If  either  of these flags are present, the interfaces 
mentioned in dhcp-ranges are added to the set which get DNS service.

Similarly, enable-tftp may take an interface name, which enables TFTP 
only for a particular interface, ignoring --interface or 
--listen-address flags. In addition --tftp-secure and --tftp-unique-root 
and --tftp-no-blocksize are ignored for requests from such interfaces. 
(A --tftp-root directive giving a root path and an interface should be 
provided too.)

These   rules   may   seem   odd   at   first   sight,  but   they 
allow  a  single  line   of  the  form
dhcp-range=interface:virt0,192.168.0.4,192.168.0.200 to be added to 
dnsmasq configuration which then supplies DHCP and DNS services  to 
that interface,  without  affecting  what  services  are  supplied to 
other interfaces and irrespective of the existance or lack of 
interface=interface lines elsewhere in the dnsmasq configuration. 
enable-tftp=virt0 and tftp-root=root,virt0 do the same job for TFTP.

The  idea is that such a line can be added automatically by libvirt or 
equivalent systems, without disturbing any manual configuration.
---


Cheers,

Simon.

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Title:
  lxc init script should fail when it ... failed

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[Bug 925511] Re: lxc init script should fail when it ... failed

2012-02-08 Thread Serge Hallyn
Thanks Ritesh and Simon, sounds like a great idea.

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  lxc init script should fail when it ... failed

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[Bug 925511] Re: lxc init script should fail when it ... failed

2012-02-07 Thread Serge Hallyn
@Ritesh,

the dnsmasq for the lxc bridge explicitly binds only lxcbr0.  So if that
fails, then your other dnsmasq has already bound all interfaces.

If /etc/init.d/lxc fails to start now, then lxcbr0 never had dhcp
before.  If you're not using lxcbr0 for your containers, then you can
simply set USE_LXC_BRIDGE=false in /etc/default/lxc.

If do want to use lxcbr0, then you should change your other dnsmasq to
not bind all interfaces.

A third alternative, I suppose, would be that you want to use lxcbr0 but
your statically assign addresses to your containers.  We could add a
USE_LXC_BRIDGE_DNSMASQ variable to /etc/default/lxc to support that use
case.  If that is what you want, please open a new bug against lxc and
I'll add it.

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Title:
  lxc init script should fail when it ... failed

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Re: [Bug 925511] Re: lxc init script should fail when it ... failed

2012-02-07 Thread Ritesh Raj Sarraf
On Tuesday 07 February 2012 09:19 PM, Serge Hallyn wrote:
 @Ritesh,

 the dnsmasq for the lxc bridge explicitly binds only lxcbr0.  So if that
 fails, then your other dnsmasq has already bound all interfaces.

Yes. Because I had dnsmasq installed by default. From the dnsmasq.conf
file's documentation, it says:

# On systems which support it, dnsmasq binds the wildcard address,
# even when it is listening on only some interfaces. It then discards
# requests that it shouldn't reply to. This has the advantage of
# working even when interfaces come and go and change address. If you
# want dnsmasq to really bind only the interfaces it is listening on,
# uncomment this option. About the only time you may need this is when
# running another nameserver on the same machine.
#bind-interfaces


So any machine, where dnsmasq is installed, will bind to all the
interfaces. This is the _default_ behavior, as installed.

libvirt was doing something similar.
http://anonscm.debian.org/gitweb/?p=pkg-libvirt/libvirt.git;a=blob;f=debian/README.Debian;h=6248662c56111c4ec4a5b2c0887059ddfb5fdda6;hb=HEAD

They bind dnsmasq to the loopback interface. Since LXC's bridge also has
similar purpose, it could try to do similar things.


 If /etc/init.d/lxc fails to start now, then lxcbr0 never had dhcp
 before.  If you're not using lxcbr0 for your containers, then you can
 simply set USE_LXC_BRIDGE=false in /etc/default/lxc.
I haven't started using it yet. So I'm not sure how it has been behaving
up till now.

 If do want to use lxcbr0, then you should change your other dnsmasq to
 not bind all interfaces.
Yes. But would you want this to be a default?

Or actually, just adding a similar documentation into LXC's
README.Debian will also suffice. No?

 A third alternative, I suppose, would be that you want to use lxcbr0 but
 your statically assign addresses to your containers.  We could add a
 USE_LXC_BRIDGE_DNSMASQ variable to /etc/default/lxc to support that use
 case.  If that is what you want, please open a new bug against lxc and
 I'll add it.


-- 
Ritesh Raj Sarraf | http://people.debian.org/~rrs
Debian - The Universal Operating System

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Title:
  lxc init script should fail when it ... failed

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[Bug 925511] Re: lxc init script should fail when it ... failed

2012-02-07 Thread Serge Hallyn
@Ritesh,

Unfortunately I don't know that that many people would read the README :)
It is worth adding though, thanks for the suggestion.

In addition, I will add an LXC section to the ubuntu server guide soon,
and this should be mentioned there.

I'm also marking this (and the equivalent libvirt) bugs as affecting
dnsmasq.  Perhaps we can do something to its default configuration to be
less belligerant.  Maybe even just an explicit
'--except-interface=virbr0,lxcbr0', though hard-coding that seems a bit
ugly.


** Also affects: dnsmasq (Ubuntu)
   Importance: Undecided
   Status: New

** Changed in: dnsmasq (Ubuntu)
   Status: New = Invalid

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  lxc init script should fail when it ... failed

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[Bug 925511] Re: lxc init script should fail when it ... failed

2012-02-07 Thread Serge Hallyn
Actually - to affect dnsmasq this should be a new bug.  Opened bug
928524 to track it.

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  lxc init script should fail when it ... failed

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[Bug 925511] Re: lxc init script should fail when it ... failed

2012-02-07 Thread Serge Hallyn
@Ritesh,

the dnsmasq for the lxc bridge explicitly binds only lxcbr0.  So if that
fails, then your other dnsmasq has already bound all interfaces.

If /etc/init.d/lxc fails to start now, then lxcbr0 never had dhcp
before.  If you're not using lxcbr0 for your containers, then you can
simply set USE_LXC_BRIDGE=false in /etc/default/lxc.

If do want to use lxcbr0, then you should change your other dnsmasq to
not bind all interfaces.

A third alternative, I suppose, would be that you want to use lxcbr0 but
your statically assign addresses to your containers.  We could add a
USE_LXC_BRIDGE_DNSMASQ variable to /etc/default/lxc to support that use
case.  If that is what you want, please open a new bug against lxc and
I'll add it.

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Title:
  lxc init script should fail when it ... failed

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Re: [Bug 925511] Re: lxc init script should fail when it ... failed

2012-02-07 Thread Ritesh Raj Sarraf
On Tuesday 07 February 2012 09:19 PM, Serge Hallyn wrote:
 @Ritesh,

 the dnsmasq for the lxc bridge explicitly binds only lxcbr0.  So if that
 fails, then your other dnsmasq has already bound all interfaces.

Yes. Because I had dnsmasq installed by default. From the dnsmasq.conf
file's documentation, it says:

# On systems which support it, dnsmasq binds the wildcard address,
# even when it is listening on only some interfaces. It then discards
# requests that it shouldn't reply to. This has the advantage of
# working even when interfaces come and go and change address. If you
# want dnsmasq to really bind only the interfaces it is listening on,
# uncomment this option. About the only time you may need this is when
# running another nameserver on the same machine.
#bind-interfaces


So any machine, where dnsmasq is installed, will bind to all the
interfaces. This is the _default_ behavior, as installed.

libvirt was doing something similar.
http://anonscm.debian.org/gitweb/?p=pkg-libvirt/libvirt.git;a=blob;f=debian/README.Debian;h=6248662c56111c4ec4a5b2c0887059ddfb5fdda6;hb=HEAD

They bind dnsmasq to the loopback interface. Since LXC's bridge also has
similar purpose, it could try to do similar things.


 If /etc/init.d/lxc fails to start now, then lxcbr0 never had dhcp
 before.  If you're not using lxcbr0 for your containers, then you can
 simply set USE_LXC_BRIDGE=false in /etc/default/lxc.
I haven't started using it yet. So I'm not sure how it has been behaving
up till now.

 If do want to use lxcbr0, then you should change your other dnsmasq to
 not bind all interfaces.
Yes. But would you want this to be a default?

Or actually, just adding a similar documentation into LXC's
README.Debian will also suffice. No?

 A third alternative, I suppose, would be that you want to use lxcbr0 but
 your statically assign addresses to your containers.  We could add a
 USE_LXC_BRIDGE_DNSMASQ variable to /etc/default/lxc to support that use
 case.  If that is what you want, please open a new bug against lxc and
 I'll add it.


-- 
Ritesh Raj Sarraf | http://people.debian.org/~rrs
Debian - The Universal Operating System

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Title:
  lxc init script should fail when it ... failed

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[Bug 925511] Re: lxc init script should fail when it ... failed

2012-02-07 Thread Serge Hallyn
@Ritesh,

Unfortunately I don't know that that many people would read the README :)
It is worth adding though, thanks for the suggestion.

In addition, I will add an LXC section to the ubuntu server guide soon,
and this should be mentioned there.

I'm also marking this (and the equivalent libvirt) bugs as affecting
dnsmasq.  Perhaps we can do something to its default configuration to be
less belligerant.  Maybe even just an explicit
'--except-interface=virbr0,lxcbr0', though hard-coding that seems a bit
ugly.


** Also affects: dnsmasq (Ubuntu)
   Importance: Undecided
   Status: New

** Changed in: dnsmasq (Ubuntu)
   Status: New = Invalid

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  lxc init script should fail when it ... failed

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[Bug 925511] Re: lxc init script should fail when it ... failed

2012-02-07 Thread Serge Hallyn
Actually - to affect dnsmasq this should be a new bug.  Opened bug
928524 to track it.

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  lxc init script should fail when it ... failed

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[Bug 925511] Re: lxc init script should fail when it ... failed

2012-02-06 Thread Ritesh Raj Sarraf
So how is it supposed to behave now?

I just did the upgrade and:


Setting up lxc (0.7.5-3ubuntu18) ...
Installing new version of config file /etc/init.d/lxc ...
 * Starting Linux Containers
   
dnsmasq: failed to create listening socket for 172.16.3.1: Address already in 
use
 * Failed to set up LXC network
invoke-rc.d: initscript lxc, action start failed.
dpkg: error processing lxc (--configure):
 subprocess installed post-installation script returned error exit status 2
Setting up ssh-askpass-gnome (1:5.9p1-2ubuntu2) ...
Setting up libcgroup1 (0.37.1-1ubuntu10) ...
Setting up cgroup-bin (0.37.1-1ubuntu10) ...
cgconfig start/running
Setting up libqtgui4 (4:4.8.0-1ubuntu5) ...


Shutting down dnsmasq allowed for the installation to complete. But now, I 
cannot start my dnsmasq service.


12:16:19 rrs@champaran:~$ sudo /etc/init.d/dnsmasq restart
[sudo] password for rrs: 
 * Restarting DNS forwarder and DHCP server dnsmasq 
   
dnsmasq: failed to create listening socket for port 53: Address already in use

[fail]

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[Bug 925511] Re: lxc init script should fail when it ... failed

2012-02-06 Thread Ritesh Raj Sarraf
So how is it supposed to behave now?

I just did the upgrade and:


Setting up lxc (0.7.5-3ubuntu18) ...
Installing new version of config file /etc/init.d/lxc ...
 * Starting Linux Containers
   
dnsmasq: failed to create listening socket for 172.16.3.1: Address already in 
use
 * Failed to set up LXC network
invoke-rc.d: initscript lxc, action start failed.
dpkg: error processing lxc (--configure):
 subprocess installed post-installation script returned error exit status 2
Setting up ssh-askpass-gnome (1:5.9p1-2ubuntu2) ...
Setting up libcgroup1 (0.37.1-1ubuntu10) ...
Setting up cgroup-bin (0.37.1-1ubuntu10) ...
cgconfig start/running
Setting up libqtgui4 (4:4.8.0-1ubuntu5) ...


Shutting down dnsmasq allowed for the installation to complete. But now, I 
cannot start my dnsmasq service.


12:16:19 rrs@champaran:~$ sudo /etc/init.d/dnsmasq restart
[sudo] password for rrs: 
 * Restarting DNS forwarder and DHCP server dnsmasq 
   
dnsmasq: failed to create listening socket for port 53: Address already in use

[fail]

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[Bug 925511] Re: lxc init script should fail when it ... failed

2012-02-02 Thread Launchpad Bug Tracker
** Branch linked: lp:~serge-hallyn/ubuntu/precise/lxc/lxc-start-
checkperms

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https://bugs.launchpad.net/bugs/925511

Title:
  lxc init script should fail when it ... failed

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[Bug 925511] Re: lxc init script should fail when it ... failed

2012-02-02 Thread Launchpad Bug Tracker
This bug was fixed in the package lxc - 0.7.5-3ubuntu17

---
lxc (0.7.5-3ubuntu17) precise; urgency=low

  [ Serge Hallyn ]
  * 0032-start-check-caps.patch: exit early and with a clear error message
if lxc-start is run with insufficient permissions.  (LP: #925520)
  * debian/lxc.init: if there is a failure during lxc network setup, clean
up and exit. (LP: #925511)

  [ Stéphane Graber ]
  * 0033-ubuntu-template-multiarch.patch: Add support for building
containers using qemu-user-static, using multi-arch to install some
packages of the host architecture so the container boots and works.
  * Add qemu-user-static as a Suggest of lxc.
 -- Stephane Graber stgra...@ubuntu.com   Thu, 02 Feb 2012 19:06:19 -0500

** Changed in: lxc (Ubuntu)
   Status: Confirmed = Fix Released

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https://bugs.launchpad.net/bugs/925511

Title:
  lxc init script should fail when it ... failed

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[Bug 925511] Re: lxc init script should fail when it ... failed

2012-02-02 Thread Launchpad Bug Tracker
** Branch linked: lp:~serge-hallyn/ubuntu/precise/lxc/lxc-start-
checkperms

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You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/925511

Title:
  lxc init script should fail when it ... failed

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/925511/+subscriptions

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[Bug 925511] Re: lxc init script should fail when it ... failed

2012-02-02 Thread Launchpad Bug Tracker
This bug was fixed in the package lxc - 0.7.5-3ubuntu17

---
lxc (0.7.5-3ubuntu17) precise; urgency=low

  [ Serge Hallyn ]
  * 0032-start-check-caps.patch: exit early and with a clear error message
if lxc-start is run with insufficient permissions.  (LP: #925520)
  * debian/lxc.init: if there is a failure during lxc network setup, clean
up and exit. (LP: #925511)

  [ Stéphane Graber ]
  * 0033-ubuntu-template-multiarch.patch: Add support for building
containers using qemu-user-static, using multi-arch to install some
packages of the host architecture so the container boots and works.
  * Add qemu-user-static as a Suggest of lxc.
 -- Stephane Graber stgra...@ubuntu.com   Thu, 02 Feb 2012 19:06:19 -0500

** Changed in: lxc (Ubuntu)
   Status: Confirmed = Fix Released

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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/925511

Title:
  lxc init script should fail when it ... failed

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/925511/+subscriptions

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