Workaround of race condition between systemd and nginx.

[Jim Popovitch]

On Wed, Dec 30, 2015 at 11:50 AM, Gena Makhomed <gmm at csdoc.com> wrote:
> On 30.12.2015 18:09, Jim Popovitch wrote:
>
>>> nginx now requires configured and up network, before starting daemon.
>
>
>> Specifically it's your configuration.
>> You are hardcoding an IP address to bind to
>> thereby telling nginx to not start until that IP is active.
>
>
> Do you know how nginx and systemd work right now?
> You understand race condition between nginx and systemd?

I understand nginx, systemd, and race conditions.  I understand why
*you* have a race condition, and I understand why I do not have a race
condition.

>> That will prevent nginx from staring in situations where systemd
>> determines that the external network is not yet active (dhcp, etc.,
>> etc), yet nginx may still run perfectly fine with split interfaces,
>> localhost, etc.
>
>
> You say, what nginx should work fine if no network available,

Yes, or even if only localhost (lo) exists.

BTW, you can read about how openvpn handled this very issue
https://community.openvpn.net/openvpn/ticket/462

> I say what nginx *must* work fine if network *IS* available.

It does, it currently works if the network IS or ISNT available, and
all possibilities in-between.

>
> So, I need create my own fork, for example, nginx-fixed,
> which I can use with OpenVZ and CentOS 7.2 templates?

No, you can simply modify your local /etc/systemd/system/nginx.service
file to specify a local startup policy.


-Jim P.