protocol request info

[AlBoPo]

Hello,

When we use JSON protocol, we have to give a request information such as "proxy data", "sender data", "agent data".

I don't understand why Zabbix has to know what kind of remote process sent the data.

Could you please enlight me please? What is the consequence on Zabbix server side?

[kloczek]

JSON it is not protocol but format/notation of the data + desrition.
https://en.wikipedia.org/wiki/JSON

[AlBoPo]

Ok thanks for this precision but my question was more about the meaning given by request info to better understand how it works.

[kloczek]

How it works .. what exactly?
You question have still missing few bits and by this is not possible to figure out about what exactly you are asking.

[AlBoPo]

Because I tried to send data from a simple custom zabbix agent, and it fails so I suppose I don't understand what these request info exactly mean.

For a precise example,, I declared a host and an item like this in Zabbix: https://i.imgur.com/qgucGxj.png

Then my custom agent sends the follwing JSON request which seems to be correct according to the doc:

AVB[12547]: Send JSON string {"request":"agent data","data":[{"host":"LL709601401410","key":"heartbeat","val ue" :1,"clock":1534953473,"ns":564379000}]}

And I receive:

AVB[12547]: Received JSON string {"response":"success","info":"processed: 0; failed: 1; total: 1; seconds spent: 0.000026"}


And I really cannot figure out what's wrong.

Do I have to use 'agent data', 'sender data', 'proxy data'?

How can I explore more precisely what failed? I cannot see anything in zabbix_server.log

[kloczek]

You said that you are trying to send some "simple custom zabbix agent" (whatever it means) then you showing some screenshot from web frontend.
If it is some problem on agent side you should check agent logs.

Then you've mention again about your "custom agent".
I have no idea about what kind of "custom agent" you are trying to tell and what exactly you are trying to do or archive (zero details about this so far).

And I really cannot figure out what's wrong.

And probably no one is able to figure out what exactly you are doing.

[DmitryL]

I guess he is simply trying to push JSON to server without actual agent installed on the machine.
If that is true, then everything is correct - except a typo in "val ue" :1

[AlBoPo]

The screenshot shows what I've configured on Zabbix server.

Then because I cannot find any ready made zabbix agent for my target, I wrote a C program supposed to mimic a zabbix agent based on the info found here (https://www.zabbix.com/documentation.../activepassive)

This C program sends the following request:

{"request":"agent data","data":[{"host":"LL709601401410","key":"heartbeat","val ue" :1,"clock":1534953473,"ns":564379000}]}

As Zabbix answered {"response":"success","info":"processed: 0; failed: 1; total: 1; seconds spent: 0.000026"}, I can suppose it well receive the request but that something is anyway not well formatted or I don't use the right request .... etc

The screenshot about my zabbix configuration may help to guess what's wrong for some experienced zabbix user....

[AlBoPo]

DmitryL it's exactly this
and 'val ue' is a typo in the post, not in the program.

And strangely, I cannot fix it....

[kloczek]

If you able to read/understand/write C code you can always have look on current agent implementation (despite this typo in json str)

[DmitryL]

[root@localhost ~]# telnet 192.168.56.101 10051
Trying 192.168.56.101...
Connected to 192.168.56.101.
Escape character is '^]'.
{"request":"agent data","data":[{"host":"test","key":"test","value" :1,"clock":1534953473,"ns":564379000}]}
ZBXDZ{"response":"success","info":"processed: 1; failed: 0; total: 1; seconds spent: 0.000033"}Connection closed by foreign host.

Try to increase debug level on Zabbix server for trapper and check the logs.
Or try to send it simply through telnet without C script.
Such errors usually appear when hostname/key don't match the one configured in frontend.

[AlBoPo]

hmm yes didn't think about that , I download the sources

[AlBoPo]

I get the same error by telnet also

[DmitryL]

From screenshot it looks like your host is monitored via Zabbix proxy.
To which process you try to send data? Proxy or Server?

[AlBoPo]

I tried to set debug to level 4, and then send my request with telnet:

Here is what I can see in the log:

2731:20180823:131255.544 trapper got '{"request":"agent data","data":[{"host":"LL709601401410","key":"heartbeat","value" :1,"clock":1534953473,"ns":564379000}]}'
2731:20180823:131255.544 In recv_agenthistory()
2731:20180823:131255.544 In process_client_history_data()
2731:20180823:131255.544 In parse_history_data()
2731:20180823:131255.544 End of parse_history_data():SUCCEED processed:1/1
2731:20180823:131255.544 In process_history_data()
2731:20180823:131255.544 End of process_history_data() processed:0
2731:20180823:131255.544 End of process_client_history_data():SUCCEED
2731:20180823:131255.544 In zbx_send_response()
2731:20180823:131255.544 zbx_send_response() '{"response":"success","info":"processed: 0; failed: 1; total: 1; seconds spent: 0.000221"}'
2731:20180823:131255.544 End of zbx_send_response():SUCCEED

And so? Does it tell you something?