With node exporter, whether we can obtain the info of virtual IP?
On Wednesday, September 8, 2021 at 5:00:42 PM UTC+8 nina guo wrote:
> I'm using node exporter to get the metrics. I dont have the virtual IP
> infos, I want to get the value first and display it on Grafana.
> You kindly provided 2 ways, we don't want to install too much exporter on
> target systems, so we prefer to use a cronjob to get the virtual IP data.
> May I know if there is an example for how to write this cronjob?
>
> On Wednesday, September 8, 2021 at 4:45:58 PM UTC+8 Brian Candler wrote:
>
>> You haven't shown the actual metric which returns the virtual IP state.
>> It may already have the info you need in labels. Which exporter are you
>> using, and can you give an example of a metric? If you're not already
>> collecting it, then obviously that's your first step. e.g. if your virtual
>> IP is managed by keepalived then you can enable its SNMP function and talk
>> to it using snmp_exporter; or you can run your virtualip list query from a
>> cronjob which writes out data in prometheus metric format into a file which
>> is picked up by node_exporter's textfile collector.
>>
>> The normal way to add info from node_uname_info onto some other metric is
>> to do a join on a common label, most commonly "instance".
>>
>> To do this, you need to ensure that the labels are identical, and this
>> means removing the port number from the label, using relabelling. That is,
>> instead of
>> node_uname_info{job="node",instance="*foo.bar:9100*
>> ",nodename="hostname",...}
>> you want
>> node_uname_info{job="node",instance="*foo.bar*",nodename="hostname",...}
>>
>> Ditto for whichever metric shows your VIP state, i.e. it also needs
>> instance="foo.bar" not "foo.bar:<someport>"
>>
>> For more info see:
>> https://www.robustperception.io/controlling-the-instance-label
>> https://groups.google.com/forum/#!topic/prometheus-users/I4dVtwI5YrM
>>
>> https://groups.google.com/forum/#!msg/prometheus-users/PPwF-2CQiSc/FsSvfCm3AwAJ
>>
>> Once you've done that, you can use a many-to-one join in PromQL to pick
>> up additional labels from node_uname_info. For example:
>> node_arp_entries * *on(instance) group_left(hostname,domainname)*
>> node_uname_info
>>
>> For more info see:
>> https://www.robustperception.io/how-to-have-labels-for-machine-roles
>>
>> https://www.robustperception.io/exposing-the-software-version-to-prometheus
>> https://www.robustperception.io/left-joins-in-promql
>>
>> https://prometheus.io/docs/prometheus/latest/querying/operators/#many-to-one-and-one-to-many-vector-matches
>>
>> On Wednesday, 8 September 2021 at 09:19:29 UTC+1 ninag...@gmail.com
>> wrote:
>>
>>> A correction:
>>>
>>> (function_name) usrname@hostname:~> virtualip list
>>> Configured Virtual IPs:
>>> -----------------------
>>> function_name on eth0
>>>
>>> Virtual IPs State:
>>> ------------------
>>> function_name: (info) Virtual IP xxxx is up and active on hostname
>>> On Wednesday, September 8, 2021 at 4:11:47 PM UTC+8 nina guo wrote:
>>>
>>>> Hi,
>>>>
>>>> Is there a way to show DNS name for a server on Grafana Dashboard?
>>>>
>>>> For example:
>>>> (function_name) usrname@hostname:~> virtualip list
>>>> Configured Virtual IPs:
>>>> -----------------------
>>>> function_name
>>>>
>>>> Virtual IPs State:
>>>> ------------------
>>>> function_name: (info) Virtual IP xxxx is up and active on hostname
>>>>
>>>> I want function_name can be shown on Grafana.
>>>>
>>>> But with node exporter, no related info shows. So what should I do to
>>>> get function_name be shown on Grafana?
>>>> node_uname_info{domainname="(none)", instance="xxx", job="xxx",
>>>> machine="x86_64", nodename="hostname", release="4default",
>>>> sysname="Linux",
>>>> version="#1 }
>>>>
>>>
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