[SOLVED] Logstash memcached does not work as expected

[pastechecker (Charlie)]

Hello.
I am attempting to set a value in a memcached using logstash 7.0.1

input { stdin { } }

filter {
grok {
match => ["message", "%{GREEDYDATA:uri_fqdn}$" ]
}
fingerprint {
method => "MD5"
enable_metric => true
concatenate_sources => false
source => ["uri_fqdn"]
target => ["memcache_key"]
}
memcached {
hosts => [ "localhost:11212" ]
ttl => 3600
set => {
"%{uri_fqdn}" => "%{memcache_key}"
}
}
}

I do not see in the tcpdump that the logstash is pushing the data to the memcached instance. I only see that the session is being established when the config loads, but later it does nothing.

Anyone got it working?
My final goal is to read a file or get data from elasticsearch and load it to the memcached. Later that memcached will be used to enrich loglines.

Thanks for the help!
Regards

[Badger]

If you run with log.level trace do you see a TRACE message as it sets each item?

[pastechecker (Charlie)]

curl -XPUT '127.0.0.1:9600/_node/logging?pretty' -H 'Content-Type: application/json' -d'

{
"logger.logstash.filters.memcached" : "TRACE"
}
'
{
"host" : "logstash",
"version" : "7.0.1",
"http_address" : "127.0.0.1:9600",
"id" : "ef4c5e2a-e313-4ba1-918d-614d73ae3913",
"name" : "logstash",
"acknowledged" : true
}

I will try.

[pastechecker (Charlie)]

I am running now:
/usr/share/logstash/bin/logstash -f memcache_load.conf --log.level=trace

My config:
input { stdin { } }

filter {
grok {
match => ["message", "%{GREEDYDATA:uri_fqdn}$" ]
}
fingerprint {
id => "domains_set_fingerprint"
method => "MD5"
enable_metric => true
concatenate_sources => false
source => ["uri_fqdn"]
target => ["memcache_key"]
}
memcached {
id => "domains_set_memcached"
hosts => [ "localhost:11212" ]
ttl => 3600
set => {
"%{uri_fqdn}" => "%{memcache_key}"
}
}
}

output { stdout { codec => rubydebug } }

When typing in the stdin I do not see anything related to the memcached.

 org.logstash.config.ir.compiler.ComputeStepSyntaxElement@28522e30
[DEBUG] 2019-05-14 18:09:07.526 [[main]>worker14] CompiledPipeline - Compiled output
 P[output-stdout{"codec"=>"rubydebug"}|[str]pipeline:25:10:```
stdout { codec => rubydebug }
```] 
 into 
 org.logstash.config.ir.compiler.ComputeStepSyntaxElement@11d949cc
[DEBUG] 2019-05-14 18:09:07.534 [[main]>worker8] CompiledPipeline - Compiled output
 P[output-stdout{"codec"=>"rubydebug"}|[str]pipeline:25:10:```
stdout { codec => rubydebug }
```] 
 into 
 org.logstash.config.ir.compiler.ComputeStepSyntaxElement@11d949cc
[DEBUG] 2019-05-14 18:09:10.588 [pool-3-thread-3] jvm - collector name {:name=>"ParNew"}
[DEBUG] 2019-05-14 18:09:10.588 [pool-3-thread-3] jvm - collector name {:name=>"ConcurrentMarkSweep"}
[DEBUG] 2019-05-14 18:09:10.828 [logstash-pipeline-flush] PeriodicFlush - Pushing flush onto pipeline.
[DEBUG] 2019-05-14 18:09:15.594 [pool-3-thread-3] jvm - collector name {:name=>"ParNew"}
[DEBUG] 2019-05-14 18:09:15.594 [pool-3-thread-3] jvm - collector name {:name=>"ConcurrentMarkSweep"}
[DEBUG] 2019-05-14 18:09:15.828 [logstash-pipeline-flush] PeriodicFlush - Pushing flush onto pipeline.
www.google.pl[DEBUG] 2019-05-14 18:09:20.600 [pool-3-thread-1] jvm - collector name {:name=>"ParNew"}
[DEBUG] 2019-05-14 18:09:20.600 [pool-3-thread-1] jvm - collector name {:name=>"ConcurrentMarkSweep"}

[DEBUG] 2019-05-14 18:09:20.828 [logstash-pipeline-flush] PeriodicFlush - Pushing flush onto pipeline.
[DEBUG] 2019-05-14 18:09:20.828 [[main]>worker2] grok - Running grok filter {:event=>#<LogStash::Event:0x4951e5bb>}
[DEBUG] 2019-05-14 18:09:20.852 [[main]>worker2] grok - Event now:  {:event=>#<LogStash::Event:0x4951e5bb>}
/usr/share/logstash/vendor/bundle/jruby/2.5.0/gems/awesome_print-1.7.0/lib/awesome_print/formatters/base_formatter.rb:31: warning: constant ::Fixnum is deprecated
{
      "@timestamp" => 2019-05-14T16:09:20.711Z,
    "memcache_key" => "c1bbd73460750d57574bf1e274462ede",
        "@version" => "1",
            "host" => "logstash",
        "uri_fqdn" => "www.google.pl",
         "message" => "www.google.pl"
}
[DEBUG] 2019-05-14 18:09:25.618 [pool-3-thread-3] jvm - collector name {:name=>"ParNew"}
[DEBUG] 2019-05-14 18:09:25.619 [pool-3-thread-3] jvm - collector name {:name=>"ConcurrentMarkSweep"}
[DEBUG] 2019-05-14 18:09:25.828 [logstash-pipeline-flush] PeriodicFlush - Pushing flush onto pipeline.

[Badger]

@pastechecker

set => {
"%{uri_fqdn}" => "%{memcache_key}"
}

Having the key as a sprintf reference is fine. The value should not be.

set => { "[uri_fqdn]" => "%{memcache_key}" }

[pastechecker (Charlie)]

That does the job done. The memcached I am running was VERSION 1.4.33 on 4.9.0-3-amd64 #1 SMP Debian 4.9.30-2+deb9u5 (2017-09-19) x86_64 GNU/Linux

Thanks for the assist!