Shutdown hooks in OpenResty?

rwag · 2015-08-31T22:43:46+00:00

It depends on your use case. Each call to ngx.update_time() requires a syscall, which can be detrimental to performance.If you just want to profile how much...

Shutdown hooks in OpenResty?

rwag

I was wondering if there is a shutdown-hook in OpenResty.

I would like to have something that cleans up resources on shutdown.

doujiang24

hi,

There is no shutdown-hook in OpenResty, but you can try like this:

init_worker_by_lua_file worker.lua

worker.lua

-----------------

local handler

local delay = 5

handle = function (premature)

if ngx.worker.exiting() then

--- cleanup()

return

end

local ok, err = ngx.timer.at(delay, handle)

if not ok then

ngx.log(ngx.ERR, "failed to create timer: ", err)

end

if not ok then

ngx.log(ngx.ERR, "failed to create timer: ", err)

end

2015-08-31 22:43 GMT+08:00 Rollin Crittendon <r...@rwag.net>:

I was wondering if there is a shutdown-hook in OpenResty.

I would like to have something that cleans up resources on shutdown.

.

rwag

Thanks DeJiang,

I have a question about this one.

I put in a timer just like that, see it log, but it never shows that the ngx.worker.exiting() is true, always displays as false, UNLESS I reload instead of stop.

Does it actually shutdown on "nginx -s stop" but just not display it?

On Monday, August 31, 2015 at 11:12:23 AM UTC-4, DeJiang Zhu wrote:

hi,

There is no shutdown-hook in OpenResty, but you can try like this:

init_worker_by_lua_file worker.lua

worker.lua
-----------------
local handler
local delay = 5

handle = function (premature)
if ngx.worker.exiting() then
--- cleanup()
return
end
local ok, err = ngx.timer.at(delay, handle)
if not ok then
ngx.log(ngx.ERR, "failed to create timer: ", err)
end
end

if not ok then
ngx.log(ngx.ERR, "failed to create timer: ", err)
end

2015-08-31 22:43 GMT+08:00 Rollin Crittendon <rw...@rwag.net>:
I was wondering if there is a shutdown-hook in OpenResty.

I would like to have something that cleans up resources on shutdown.

.

doujiang24

hi, Rollin

This works only nginx graceful shutdown. `nginx -s quit` shoud works fine.

http://nginx.org/en/docs/beginners_guide.html

2015-09-01 0:43 GMT+08:00 Rollin Crittendon <r...@rwag.net>:

Thanks DeJiang,

I have a question about this one.
I put in a timer just like that, see it log, but it never shows that the ngx.worker.exiting() is true, always displays as false, UNLESS I reload instead of stop.

Does it actually shutdown on "nginx -s stop" but just not display it?

On Monday, August 31, 2015 at 11:12:23 AM UTC-4, DeJiang Zhu wrote:
hi,

There is no shutdown-hook in OpenResty, but you can try like this:

init_worker_by_lua_file worker.lua

worker.lua
-----------------
local handler
local delay = 5

handle = function (premature)
if ngx.worker.exiting() then
--- cleanup()
return
end
local ok, err = ngx.timer.at(delay, handle)
if not ok then
ngx.log(ngx.ERR, "failed to create timer: ", err)
end
end

if not ok then
ngx.log(ngx.ERR, "failed to create timer: ", err)
end

2015-08-31 22:43 GMT+08:00 Rollin Crittendon <rw...@rwag.net>:
I was wondering if there is a shutdown-hook in OpenResty.

I would like to have something that cleans up resources on shutdown.

.

rwag

Excellent, thank you Dejiang, this is working great for me.

On Monday, August 31, 2015 at 10:00:48 PM UTC-4, DeJiang Zhu wrote:

hi, Rollin

This works only nginx graceful shutdown. `nginx -s quit` shoud works fine.

http://nginx.org/en/docs/beginners_guide.html

2015-09-01 0:43 GMT+08:00 Rollin Crittendon <rw...@rwag.net>:
Thanks DeJiang,

I have a question about this one.
I put in a timer just like that, see it log, but it never shows that the ngx.worker.exiting() is true, always displays as false, UNLESS I reload instead of stop.

Does it actually shutdown on "nginx -s stop" but just not display it?

On Monday, August 31, 2015 at 11:12:23 AM UTC-4, DeJiang Zhu wrote:
hi,

There is no shutdown-hook in OpenResty, but you can try like this:

init_worker_by_lua_file worker.lua

worker.lua
-----------------
local handler
local delay = 5

handle = function (premature)
if ngx.worker.exiting() then
--- cleanup()
return
end
local ok, err = ngx.timer.at(delay, handle)
if not ok then
ngx.log(ngx.ERR, "failed to create timer: ", err)
end
end

if not ok then
ngx.log(ngx.ERR, "failed to create timer: ", err)
end

2015-08-31 22:43 GMT+08:00 Rollin Crittendon <rw...@rwag.net>:
I was wondering if there is a shutdown-hook in OpenResty.

I would like to have something that cleans up resources on shutdown.

.