> On 24 Feb 2016, at 01:02, Willy Tarreau <w...@1wt.eu> wrote: > > Hi Dmitry, > > On Fri, Feb 19, 2016 at 05:58:47PM +0300, Dmitry Sivachenko wrote: >> Hello, >> >> I want to define ACL which will evaluate to true if a current number of >> connections to a particular backend is greater than a number of usable >> servers in that backend multiplied on some constant: >> >> be_conn(BACK) > nbsrv(BACK) * N >> >> So far I came up with the following solution: >> >> frontend FRONT >> mode http # can be either http or tcp here >> tcp-request content set-var(sess.nb) nbsrv(BACK) # I use tcp-request >> here (not http-request) so it works for both http and tcp mode backends >> acl my_acl be_conn(BACK),div(sess.nb) gt 10 # "N" in 10 here >> >> >> So I must use set-var here because div() accepts either a number or a >> variable. >> >> Is this a good sulution for my problem or it can be done better? > > It currently is the only available solution, and I'm glad that you spotted > it because support for variables in arithmetic operators was added in great > part to permit such things. > > I do have one comment regarding your comment about tcp-request vs > http-request. What you say is valid only if you don't have "mode http" > in your frontend, but I assume that you simplified the config so that > it's easy to understand here. >
I do have "mode http" (I intentionally put it here with a comment). Will it work only for tcp-mode frontend? Or should I use tcp-request for tcp frontend and http-request for http frontend?
