Zero-downtime restarts while updating the environment?

Zero-downtime restarts while updating the environment?

[Jonathan del Strother]

Hi there,
I recently ran into a problem where I had to update bundler from 1.3
to 1.5 so that it recognised the "platforms:[ruby_21]" option in my
Gemfile.  However, Unicorn continued to use Bundler 1.3 when I
re-exec'd it via USR2 (perhaps unsurprisingly), and so couldn't load
my new gemfile until I completely restarted it.

I ended up tweaking our balancers to funnel all our traffic to half
our backend machines, restarted unicorn on the other half, then
flipped the traffic to the first half and repeat.  Is that the
standard way of doing it, or is there a better way?
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Re: Zero-downtime restarts while updating the environment?

[Sam Saffron]

cycling in and out of the load balancer is standard, you can also do
this: http://samsaffron.com/archive/2013/11/13/live-restarts-of-a-supervised-unicorn-process

On Sat, Jan 4, 2014 at 6:15 AM, Jonathan del Strother
<maillist@steelskies.com> wrote:
> Hi there,
> I recently ran into a problem where I had to update bundler from 1.3
> to 1.5 so that it recognised the "platforms:[ruby_21]" option in my
> Gemfile.  However, Unicorn continued to use Bundler 1.3 when I
> re-exec'd it via USR2 (perhaps unsurprisingly), and so couldn't load
> my new gemfile until I completely restarted it.
>
> I ended up tweaking our balancers to funnel all our traffic to half
> our backend machines, restarted unicorn on the other half, then
> flipped the traffic to the first half and repeat.  Is that the
> standard way of doing it, or is there a better way?
> _______________________________________________
> Unicorn mailing list - mongrel-unicorn@rubyforge.org
> http://rubyforge.org/mailman/listinfo/mongrel-unicorn
> Do not quote signatures (like this one) or top post when replying
_______________________________________________
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Do not quote signatures (like this one) or top post when replying

Re: Zero-downtime restarts while updating the environment?

[Eric Wong]

Jonathan del Strother <maillist@steelskies.com> wrote:
> Hi there,
> I recently ran into a problem where I had to update bundler from 1.3
> to 1.5 so that it recognised the "platforms:[ruby_21]" option in my
> Gemfile.  However, Unicorn continued to use Bundler 1.3 when I
> re-exec'd it via USR2 (perhaps unsurprisingly), and so couldn't load
> my new gemfile until I completely restarted it.

You can poke around in the ENV hash with the before_exec hook to
remove/change any environment variables Bundler uses.
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