SSL session cache lifetime vs session ticket lifetime

[kyprizel]

something like this?


On Tue, Mar 18, 2014 at 8:00 PM, Maxim Dounin <mdounin at mdounin.ru> wrote:

> Hello!
>
> On Tue, Mar 18, 2014 at 03:42:33PM +0400, kyprizel wrote:
>
> > What will be the best way to do it?
>
> Probably a flag in ngx_slab_pool_t will be good enough.
>
> >
> >
> > On Tue, Mar 18, 2014 at 3:33 PM, Maxim Dounin <mdounin at mdounin.ru>
> wrote:
> >
> > > Hello!
> > >
> > > On Tue, Mar 18, 2014 at 03:26:10PM +0400, kyprizel wrote:
> > >
> > > > Hi,
> > > > currently SSL session lifetime and SSL ticket lifetime are equal in
> > > nginx.
> > > >
> > > > If we use session tickets with big enough lifetime (12hrs), we get a
> lot
> > > of
> > > > error log messages while allocating new sessions in shared memory:
> > > >
> > > > 2014/03/18 13:36:08 [crit] 18730#0: ngx_slab_alloc() failed: no
> memory in
> > > > SSL session shared cache "SSL"
> > > >
> > > > We don't want to increase session cache size b/c working with it is a
> > > > blocking operation and I believe it doesn't work good enought in our
> > > > network scheme.
> > >
> > > Just a side note: I don't think that size matters from performance
> > > point of view.  The only real downside is memory used.
> > >
> > > > As I can see - those messages are generated by ngx_slab_alloc_pages()
> > > even
> > > > if session was added to the cache after expiration of some old ones.
> > > >
> > > > So, what do you think if we add one more config parameter to split
> > > session
> > > > cache and session ticket lifetimes?
> > >
> > > May be better approach will be to just avoid such messages?
> > >
> > > --
> > > Maxim Dounin
> > > http://nginx.org/
> > >
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> > >
>
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>
> --
> Maxim Dounin
> http://nginx.org/
>
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