TCPProbe is a modern TCP tool and service for network performance observability.

Hi mehrdadrad:

1. we can simplify image build script, as the docker documentation says: If the WORKDIR doesn’t exist, it will be created, so we can just use WORKDIR /go/src/github.com/mehrdadrad/tcpprobe replace multiple lines, and then copy current dir to the container

2. I test this on my laptop, it works fine

docker build -t  mehrdadrad/tcpprobe:v0.2  .
...........                                                                                                                                                  
 ---> b870df39c040
Step 6/9 : FROM alpine
 ---> d6e46aa2470d
Step 7/9 : COPY --from=builder /go/src/github.com/mehrdadrad/tcpprobe/tcpprobe /usr/bin/
 ---> Using cache
 ---> c33729cb2037
Step 8/9 : EXPOSE 8081
 ---> Using cache
 ---> 2658e857863b
Step 9/9 : ENTRYPOINT ["tcpprobe"]
 ---> Using cache
 ---> 2440e7304aff
Successfully built 2440e7304aff
Successfully tagged mehrdadrad/tcpprobe:v0.2

docker container run --rm mehrdadrad/tcpprobe:v0.2 https://cn.bing.com                                                                                                                                                                     
Target:https://cn.bing.com IP:202.89.233.100 Timestamp:1607011996
State:1 CaState:0 Retransmits:0 Probes:0 Backoff:0 Options:6 Rto:230000 Ato:40000 SndMss:1412 RcvMss:1412 Unacked:0 Sacked:0 Lost:0 Retrans:0 Fackets:0 LastDataSent:130 LastAckSent:0 LastDataRecv:0 LastAckRecv:4 Pmtu:1500 RcvSsthresh:64076 Rtt:27506 Rttvar:6368 SndSsthresh:2147483647 SndCwnd:10 Advmss:1460 Reordering:3 RcvRtt:0 RcvSpace:14600 TotalRetrans:0 HTTPStatusCode:200 HTTPRcvdBytes:112920 HTTPRequest:229663 HTTPResponse:32820 DNSResolve:27775 TCPConnect:27406 TLSHandshake:131382 TCPConnectError:0 DNSResolveError:0 

Looks like a number of values are not available when running docker on ARM or maybe rasberrypi specifically?

• RTO
• RcvMss
• SndMss
• pmtu
• RTT
• Congestion window size

Is this a platform limitation? I used the default docker-compose file when I cloned the repo on both x86 and arm, and the arm one doesn't display these values.

The tcpprobe seems to work well in the k3s cluster. It probes some sites continuously and I can see tcp-related metrics in the Prometheus and Grafana. I follow the config file described in https://github.com/mehrdadrad/tcpprobe/wiki/helm , where i set a nginx deployment and annotate it to tell tcpprobe to "probe" it.
But after that I deployed the Nginx server. I found several things confusing.

• the annotation tcpprobe/targets: "http://PODIP:80" didn't get rewritten , which means that PODIP is literally PODIP and so i know the Nginx won't be "probed"
• even if i fill the right ip address of the nginx server using another pod's annotation, the Nginx server still didn't get probed. I see no data in the metrics it expose.

Env: OS X + k3d cluster (k3s in docker)

I would appreciate all the help, thanks!

apiVersion: apps/v1 
kind: Deployment
metadata:
  name: nginx-deployment
spec:
  selector:
    matchLabels:
      app: nginx
  replicas: 1
  template:
    metadata:
      labels:
        app: nginx
      annotations:
        tcpprobe/targets: "http://PODIP:80"
        tcpprobe/interval: "10s"
        tcpprobe/labels: '{"app": "nginx"}'
    spec:
      containers:
        - name: nginx
          image: nginx:latest
          ports:
            - containerPort: 80