create systemd unit example

[joewilliams]

I am interested in running this under systemd rather than inside kube. This PR includes an example systemd unit file and environment config file.

joe@dev:~$ sudo systemctl status netobserv-ebpf-agent
● netobserv-ebpf-agent.service - Netobserv eBPF Agent
     Loaded: loaded (/lib/systemd/system/netobserv-ebpf-agent.service; disabled; preset: enabled)
     Active: active (running) since Wed 2022-10-05 18:26:05 UTC; 1s ago
   Main PID: 20013 (netobserv-ebpf-)
      Tasks: 8 (limit: 2173)
     Memory: 20.8M
        CPU: 17ms
     CGroup: /system.slice/netobserv-ebpf-agent.service
             └─20013 /opt/netobserv-ebpf-agent/bin/netobserv-ebpf-agent

Oct 05 18:26:05 dev systemd[1]: Started Netobserv eBPF Agent.
Oct 05 18:26:05 dev netobserv-ebpf-agent[20013]: time="2022-10-05T18:26:05Z" level=info msg="starting NetObserv eBPF Agent"
Oct 05 18:26:05 dev netobserv-ebpf-agent[20013]: time="2022-10-05T18:26:05Z" level=info msg="initializing Flows agent" component=agent.Flows
Oct 05 18:26:05 dev netobserv-ebpf-agent[20013]: time="2022-10-05T18:26:05Z" level=info msg="push CTRL+C or send SIGTERM to interrupt execution"
Oct 05 18:26:05 dev netobserv-ebpf-agent[20013]: time="2022-10-05T18:26:05Z" level=info msg="starting Flows agent" component=agent.Flows
Oct 05 18:26:05 dev netobserv-ebpf-agent[20013]: time="2022-10-05T18:26:05Z" level=info msg="Flows agent successfully started" component=agent.Flows
Oct 05 18:26:05 dev netobserv-ebpf-agent[20013]: time="2022-10-05T18:26:05Z" level=info msg="interface detected. Registering flow tracer" component=agent.Flows interface="{enp0s3 2}"
Oct 05 18:26:05 dev netobserv-ebpf-agent[20013]: time="2022-10-05T18:26:05Z" level=warning msg="qdisc clsact already existed. Deleted it" component=ebpf.FlowTracer iface="{enp0s3 2}"
Oct 05 18:26:05 dev netobserv-ebpf-agent[20013]: time="2022-10-05T18:26:05Z" level=info msg="interface detected. Registering flow tracer" component=agent.Flows interface="{docker0 3}"
Oct 05 18:26:05 dev netobserv-ebpf-agent[20013]: time="2022-10-05T18:26:05Z" level=warning msg="qdisc clsact already existed. Deleted it" component=ebpf.FlowTracer iface="{docker0 3}"

[jotak]

lgtm and I don't have any objection for that. Thanks @joewilliams !

cc @mariomac

[mariomac]

No objections! Thank you for the contribution!

[codecov-commenter]

Codecov Report

Merging #59 (70ca405) into main (24af5a5) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #59   +/-   ##
=======================================
  Coverage   34.76%   34.76%           
=======================================
  Files          19       19           
  Lines        1300     1300           
=======================================
  Hits          452      452           
  Misses        829      829           
  Partials       19       19           

Flag	Coverage Δ
unittests	34.76% <ø> (ø)

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