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From Vasanth Mathivanan <>
Subject RE: How to use lua plugin and Scripts in Traffic server ?
Date Wed, 03 Oct 2018 05:48:48 GMT
Hi Chan,

1.We had ATS 6.2 in Centos 6

2.Remap rules looks like below :

    # DO NOT EDIT - Generated for edge1 by Traffic Ops (https://x.x.x.x) on Wed May 30 09:22:41
EDT 2018

map       http://x.x.x.x:8082/     http://x.x.x.x/ @pparam=dscp/set_dscp_32.config @pparam=hdr_rw_live.config @pparam=bg_fetch.config @@pparam=lua_test.lua

map       http://x.x.x.x:8082/     http://x.x.x.x/ @pparam=dscp/set_dscp_0.config @pparam=bg_fetch.config

note: I tried to given entire path in @@pparm syntax like @@pparam=/opt/trafficserver/libexec/trafficserver/test_lua.lua

3.Lua Script looks like :

   function cache_lookup()

    local cache_status = ts.http.get_cache_lookup_status()

    if cache_status == TS_LUA_CACHE_LOOKUP_HIT_FRESH then



        print('not hit')




function do_remap()

    ts.hook(TS_LUA_HOOK_CACHE_LOOKUP_COMPLETE, cache_lookup)

    return 0


4.yes I did curl method only .

[root@wow-den-stremer174 ~]# curl -I x.x.x.x:8082

TTP/1.1 404 Not Found on Accelerator

Date: Wed, 03 Oct 2018 05:13:23 GMT

Connection: keep-alive

Via: http/1.1 x.x.x.x. (ApacheTrafficServer/6.2.3 [uSc s f p eS:tNc  i p s ])

Server: ATS/6.2.3

Cache-Control: no-store

Content-Type: text/html

Content-Language: en

Content-Length: 297

5.Diags log:

[Oct  2 22:38:33.537] Server {0x2b25ed7fd240} ERROR: [ReverseProxy] failed to add remap rule
at /opt/trafficserver/etc/trafficserver/remap.config line 2: Failed to create instance for
plugin "/opt/trafficserver/libexec/trafficserver/": [TSRemapNewInstance] - lua script
file or string is required !!

Note : traffic.out and error.log nothing to do .


Sent from Mail<> for Windows 10

From: Shu Kit Chan<>
Sent: Tuesday, October 2, 2018 1:55 AM
Subject: Re: How to use lua plugin and Scripts in Traffic server ?

A few things

1) What version of ATS are you on? 5.3.x ?
2) Can you show how your remap rules looks like?
3) you use the example lua script? if not, what is written in your script?
4) how do you test that? curl a url that goes against your machine?
5) Any messages in traffic.out / error.log / diags.log that is of interest ?


On Mon, Oct 1, 2018 at 6:08 AM Vasanth Mathivanan
<> wrote:
> Hi,
> As per document I saw lot of examples in this
  I did the  remap config changes  ( plugin and parameters ) then make a script file in some
path and  pointed on remap  Config .There is no response on it .
> How I could use in traffic server  and also test them  ?
> -Vasanth
> Sent from Mail for Windows 10

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