bz_1835371

Create cluster
Create test data: https://github.com/openshift/origin/blob/master/test/extended/testdata/router/router-metrics.yaml
Create execpod (needs curl with --haproxy-protocol):

cat <<EOF | kubectl apply -f -
apiVersion: v1
kind: Pod
metadata:
  name: execpod
spec:
  containers:
  - name: test
    image: pstauffer/curl:latest
    args:
    - sleep
    - "1000000"
EOF

Exec into the execpod:

$kubectl exec -it execpod -- /bin/sh

Generate traffic to the testdata endpoint:

set -e
STOP=$(($(date '+%s') + 10))
while [ $(date '+%s') -lt $STOP ]; do
    rc=0
    code=$( curl --haproxy-protocol -s -m 5 -o /dev/null -w '%{http_code}\n' --header 'Host: weighted.metrics.example.com' "http://10.128.2.6" ) || rc=$?
    if [[ "${rc:-0}" -eq 0 ]]; then
        echo $code
        if [[ $code -ne 200 ]]; then
            exit 1
        fi        
    else
        echo "error ${rc}" 1>&2
    fi
done
'
Run a continuous curl to the testdata route:

Note: "10.128.2.6" is the pod IP of one of my routers:

$ oc get po -n openshift-ingress -o wide
NAME                              READY   STATUS    RESTARTS   AGE   IP           NODE                                         NOMINATED NODE   READINESS GATES
router-default-669657d88c-2x5bf   1/1     Running   0          9h    10.131.0.5   ip-10-0-134-252.us-west-2.compute.internal   <none>           <none>
router-default-669657d88c-tg9bd   1/1     Running   0          9h    10.128.2.6   ip-10-0-169-251.us-west-2.compute.internal   <none>           <none>

Check the haproxy_server_max_sessions router metric:

$ oc exec router-default-669657d88c-2x5bf -n openshift-ingress -- curl -s -k -H "Authorization: Bearer ${TOKEN}" http://10.131.0.5:1936/metrics | grep haproxy_server_max_sessions
# HELP haproxy_server_max_sessions Maximum observed number of active sessions.
# TYPE haproxy_server_max_sessions gauge
haproxy_server_max_sessions{namespace="",pod="",route="",server="fe_no_sni",service=""} 1
haproxy_server_max_sessions{namespace="",pod="",route="",server="fe_sni",service=""} 9
haproxy_server_max_sessions{namespace="default",pod="endpoint-1",route="weightedroute",server="10.129.2.11:8080",service="weightedendpoints1"} 1
haproxy_server_max_sessions{namespace="default",pod="endpoint-1",route="zeroweightroute",server="10.129.2.11:8080",service="weightedendpoints1"} 0
haproxy_server_max_sessions{namespace="default",pod="endpoint-2",route="weightedroute",server="10.128.2.10:8080",service="weightedendpoints2"} 1
haproxy_server_max_sessions{namespace="default",pod="endpoint-2",route="zeroweightroute",server="10.128.2.10:8080",service="weightedendpoints2"} 0
haproxy_server_max_sessions{namespace="openshift-authentication",pod="oauth-openshift-5bd578dc64-44mr8",route="oauth-openshift",server="10.128.0.37:6443",service="oauth-openshift"} 14
haproxy_server_max_sessions{namespace="openshift-authentication",pod="oauth-openshift-5bd578dc64-c755t",route="oauth-openshift",server="10.129.0.43:6443",service="oauth-openshift"} 0
haproxy_server_max_sessions{namespace="openshift-console",pod="console-78db4656b8-chqjz",route="console",server="10.129.0.44:8443",service="console"} 1
haproxy_server_max_sessions{namespace="openshift-console",pod="console-78db4656b8-qzxj6",route="console",server="10.128.0.39:8443",service="console"} 8
haproxy_server_max_sessions{namespace="openshift-console",pod="downloads-7b9c66496c-7cprb",route="downloads",server="10.129.0.13:8080",service="downloads"} 0
haproxy_server_max_sessions{namespace="openshift-console",pod="downloads-7b9c66496c-rcj4k",route="downloads",server="10.129.0.24:8080",service="downloads"} 0
haproxy_server_max_sessions{namespace="openshift-monitoring",pod="alertmanager-main-0",route="alertmanager-main",server="10.129.2.5:9095",service="alertmanager-main"} 0
haproxy_server_max_sessions{namespace="openshift-monitoring",pod="alertmanager-main-1",route="alertmanager-main",server="10.128.2.8:9095",service="alertmanager-main"} 0
haproxy_server_max_sessions{namespace="openshift-monitoring",pod="alertmanager-main-2",route="alertmanager-main",server="10.131.0.16:9095",service="alertmanager-main"} 0
haproxy_server_max_sessions{namespace="openshift-monitoring",pod="grafana-77f7fc6f6f-wlklz",route="grafana",server="10.129.2.7:3000",service="grafana"} 0
haproxy_server_max_sessions{namespace="openshift-monitoring",pod="prometheus-k8s-0",route="prometheus-k8s",server="10.129.2.8:9091",service="prometheus-k8s"} 0
haproxy_server_max_sessions{namespace="openshift-monitoring",pod="prometheus-k8s-1",route="prometheus-k8s",server="10.128.2.9:9091",service="prometheus-k8s"} 0
haproxy_server_max_sessions{namespace="openshift-monitoring",pod="thanos-querier-8b87bc5f8-p22wq",route="thanos-querier",server="10.128.2.7:9091",service="thanos-querier"} 0
haproxy_server_max_sessions{namespace="openshift-monitoring",pod="thanos-querier-8b87bc5f8-zmnkg",route="thanos-querier",server="10.129.2.6:9091",service="thanos-querier"} 0

Note that haproxy_server_max_sessions shows 1 for each tesdata endpoint. This differs from 0 in the BZ.

danehans/01_curl_cmd.md