Re: Accessing to nginx access_log
- From: Antti Kantee <pooka@xxxxxx>
- To: rumpkernel-users@xxxxxxxxxxxxx
- Date: Thu, 21 Apr 2016 11:01:07 +0000
On 19/04/16 23:32, Ruben Rubio Rey wrote:
Hi Everyone,
I just started to learn about unikernels. I am really enjoying learning
about rump unikernels.
I started reading documentation and with the tutorial to deliver a nginx
static server
<https://github.com/rumpkernel/wiki/wiki/Tutorial%3A-Serve-a-static-website-as-a-Unikernel>
which worked very well. But I have two questions related to the rump
unikernels:
1 - This example sets the access_log to /dev/null, and the error_log is
redirected to stderr which is displayed in the qemu terminal. How can I
have access to the access_log ? (you can also view this question in
stackoverflow
<http://stackoverflow.com/questions/36706926/rump-unikernel-nginx-logs>)
I guess it depends on your use case. For example, you can configure a
block device with a file system, and log to that. Or, you can configure
access_log to appear on the console and read it from there.
The usability interface for logging is really more of a question for the
Orchestrating System (OS) built on top of the Rumprun unikernel.
2 - Many applications generates information that requires persistence. How
could I enable persistence in a rump unikernel ?
I assume that by persistence you mean persistence of data across
instances. Again, it depends on your use case. For example, you can
use cloud storage, or a "local" file system (where "local" might mean on
the cloud -- the cloud is recursively confusing).
The remaining issue is how to get the application to sync its data to a
clean state. Some applications support an "in-band" method for
signalling a sync, e.g. rumprun-nethack will save the game when the user
presses "S". For applications which don't support that, normally a
signal is used. With rump kernels and therefore Rumprun taking heed of
the "signals are evil" tautology, the signal approach won't work
out-of-the-box. Some code remains to be conjured up to address the
general case.
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