jolokia plugin - do not overwrite host tag

[pckeyan]

Hi,

I am using telegraf to publish jolokia metrics to influxdb within Docker Container. As we are employing Microservice, It would be great if we capture the Application Name to publish the data like in [[inputs.jolokia.servers]]. There is name which we use for EC2 IP, host and port for jolokia. If we have application name would gives us more flexibility in getting the data collectively.
Please advice.

Thanks and Regards
Karthik

[sparrc]

I don't quite understand, can you give an example?

[pckeyan]

Hi,

I would like to configure,

[[inputs.jolokia.servers]]
name = "HOST_IP"
host = "localhost"
port = "8080"
appName = "customer-app"

appName is a sample. I can query based on customer-app metrics across different IPs to aggregate the results.

Regards
Karthik

[sparrc]

why don't you use "name" as the tag?

[pckeyan]

I need to capture the IP Address of the host as we may have upto 6 docker containers in an instance. So I am using name for that case.

[sparrc]

I see, so the problem is actually that the jolokia plugin is overwriting the regular host tag, that is what needs to be changed

[pckeyan]

Please correct me if I am wrong, jolokia needs the host and port to connect; so I am leaving it localhost and 8080.

[sparrc]

yes, you're not doing anything wrong, normally telegraf has a host tag, which you are setting to HOST_IP. The jolokia plugin incorrectly overwrites it.

[subhachandrachandra]

There is a scenario where the plugin might have to add the host tag. For example, since jolokia allows remote access, telegraf can run on one host/container and query stats from multiple hosts/containers using the "servers" config. In this case telegraf will report host as the machine on which it is running. What we really want is stats from each machine being queried report host as the machine that is being queried.

So, in the cassandra plugin (based on jolokia) there is code like

func addServerTags(host string, tags map[string]string) {
        if host != "" && host != "localhost" && host != "127.0.0.1" {
                tags["host"] = host
        }
}

If "localhost" is being used, we let telegraf add the "host" tag otherwise the one from the "server" config overrides it.

[sparrc]

I don't agree with that, if that's the case then just ignore the host tag. For Telegraf, host is and should always be the host of the system it is running on.

if you really can't stand the host tag being there, then you can use the new tagexclude option to strip it from your measurements.

[pckeyan]

Hi, I see that I am populating the name attribute in telegraf and is stored as server in InfluxDb. Are you referring this above? if I have name and server, I can easily map the app name to name and HOST_IP to server.