[lxc-users] The dark side of LXC

[Fajar A. Nugraha]

Distros often change things to make it more suitable with their
environment, or to fix bugs faster than upstream. For example,
Ubuntu's version of mysql uses only upstart, which only tracks the pid
of the msyqld process it started.

I've also looked at Mariadb's[1] startup script, and it should handle
service startup/shutdown correctly since it uses pid file. So you can
do one of:
- file a bug to oracle, and hope they fix it.
- switch to mariadb
- switch to a distro that properly fix the bug
- fix the bug yourself (e.g. modify the startup script, based on one
that works correctly)

-- 
Fajar

[1] https://mariadb.org/

On Sat, Jul 12, 2014 at 11:50 PM, CDR <venefax at gmail.com> wrote:
> I think it is a bug from Oracle, not my distro. They act like if the
> owned the server.
>
> On Sat, Jul 12, 2014 at 12:42 PM, Stéphane Graber <stgraber at ubuntu.com> wrote:
>> On Sat, Jul 12, 2014 at 11:35:06AM -0400, CDR wrote:
>>> There is an unresolved issue that really goes to the core of the
>>> container model.
>>> Yesterday I installed Mysql latest on the host, and had to remove it
>>> one hour later. It turns out that since I have 20 containers each with
>>> a running version if mysql, the instance running on the host kills the
>>> other instances when you try to stop mysql, an similarly, the host
>>> version never starts because it thinks, wrongly, that it is already
>>> running.
>>>
>>> We need to make the host ignore the processes running on the
>>> containers, much like a real virtual machine, or else the host cannot
>>> really run any application whatsoever.
>>
>> That's the sign of a broken init script, init scripts should be tracking
>> the pid of the spawned process and only kill that. Please file a bug
>> against your distro, that's nothing to do with LXC.
>>
>>>
>>>
>>> Philip Orleans
>>> _______________________________________________
>>> lxc-users mailing list
>>> lxc-users at lists.linuxcontainers.org
>>> http://lists.linuxcontainers.org/listinfo/lxc-users
>>
>> --
>> Stéphane Graber
>> Ubuntu developer
>> http://www.ubuntu.com
>>
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