Em/fixup build add injectable config entrypoint, + sample k8s deployment

Dockerfile

@@ -1,12 +1,10 @@
-FROM golang:1.9  AS builder
+FROM golang:1.9-alpine
 
 RUN mkdir /app
 ADD . /app/
 WORKDIR /app
+RUN apk add git bash
 RUN go get github.com/go-sql-driver/mysql
 RUN go build -o main .
 
-FROM alpine:3.10
-
-COPY --from=builder /app/main /usr/bin/mysql-load-generator
-CMD ["/usr/bin/mysql-load-generator"]
+CMD ["/app/entrypoint.sh"]

config-template.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+set -x
+
+. vars.sh
+
+cat << EOF > config.json
+{
+    "connectionString": "${USER}:${PASSWORD}@tcp(${HOST}:${PORT})/${DB}",
+    "requestsPerSecond": ${RPS},
+    "printLogs": true,
+    "timeToRunInSeconds": ${TTR},
+    "queries" : [
+	"${QUERY}"
+    ]
+}
+EOF

entrypoint.sh

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+./config-template.sh
+
+/app/main "$@"
+

load-gen.deployment.yaml

@@ -0,0 +1,50 @@
+---
+apiVersion: apps/v1 # for versions before 1.9.0 use apps/v1beta2
+kind: Deployment
+metadata:
+  name: loadgen
+  labels:
+    app: loadgen
+spec:
+  strategy:
+    type: RollingUpdate
+    rollingUpdate:
+      maxUnavailable: 0%
+      maxSurge: 66%
+  revisionHistoryLimit: 5
+  replicas: 1
+  selector:
+    matchLabels:
+      app: loadgen
+  template:
+    metadata:
+      labels:
+        app: loadgen
+    spec:
+      containers:
+      - image: lvejm/mysql-load-generator
+        name: loadgen
+        imagePullPolicy: Always
+        resources:
+          limits:
+            cpu: 200m
+            memory: 200Mi
+          requests:
+            cpu: 100m
+            memory: 75Mi
+        env:
+          - name: lg_USER
+            value: maxscale1
+          - name: lg_PASSWORD
+            value: maxscaledemo1
+          - name: lg_HOST
+            value: maxscale.maxscale.svc.cluster.local
+          - name: lg_DB
+            value: employees
+          - name: lg_RPS
+            value: "2"
+          - name: lg_TTR
+            value: "90"
+          - name: lg_QUERY
+            value: "select emp.emp_no, emp.first_name, emp.last_name, sal.salary, sal.from_date from employees emp inner join (select emp_no, MAX(salary) as salary, from_date from salaries group by emp_no) sal on (emp.emp_no = sal.emp_no) LIMIT 50;"
+

vars.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+# setup for overrides in container environment prefixed by "lg_"
+
+export USER=${lg_USER:-maxscale1}
+export PASSWORD=${lg_PASSWORD:-maxscaledemo}
+export HOST=${lg_HOST:-maxscale.maxscale.svc.cluster.local}
+export PORT=${lg_PORT:-3306}
+export DB=${lg_DB:-employees}
+
+export RPS=${lg_RPS:-2}
+export TTR=${lg_TTR:-90}
+export QUERY=${lg_QUERY:-"select emp.emp_no, emp.first_name, emp.last_name, sal.salary, sal.from_date from employees emp inner join (select emp_no, MAX(salary) as salary, from_date from salaries group by emp_no) sal on (emp.emp_no = sal.emp_no) LIMIT 50;"}
+
+