diff --git a/Dockerfile.alpine b/Dockerfile.alpine
index d06daa5dd..39b2ce382 100755
--- a/Dockerfile.alpine
+++ b/Dockerfile.alpine
@@ -4,6 +4,7 @@ RUN apk add --quiet --no-cache \
     apache2 \
     php-apache2 \
     php-ctype \
+    php-phar \
     php-gd \
     php-openssl \
     php-pdo \
diff --git a/docker/test/README.md b/docker/test/README.md
new file mode 100644
index 000000000..cafd486ee
--- /dev/null
+++ b/docker/test/README.md
@@ -0,0 +1,4 @@
+The files in this folder represent a simple end to end test.
+At the moment it is interactive, so you need to run `docker compose up` in the folder and watch the output for errors.
+Sometimes the mysql container needs more than 15 seconds, so the test_script fails.
+Just try it again.
\ No newline at end of file
diff --git a/docker/test/docker-compose.yml b/docker/test/docker-compose.yml
index b04e18f18..4040485ac 100644
--- a/docker/test/docker-compose.yml
+++ b/docker/test/docker-compose.yml
@@ -1,5 +1,14 @@
 ## this is a docker compose file used to test all scenarios
 ## do not use it in production
+x-shared:
+  speedtest-service: &speedtest-service
+    environment:
+      - PASSWORD=gimmeTheStats1337
+      - EMAIL=test@example.com
+      - ENABLE_ID_OBFUSCATION=true
+      - MODE=standalone
+      - REDACT_IP_ADDRESSES=true
+      - TELEMETRY=true
 
 services:
 ###################### POSTGRESQL ################################
@@ -104,9 +113,27 @@ services:
     ports:
       - 9128:8080
 
+  speedtest-alpine-sqlite-dual:
+    <<: *speedtest-service
+    build:
+      context: ../..
+      dockerfile: Dockerfile.alpine
+    environment:
+      - MODE=dual
+
+    volumes:
+      - ./servers.json:/servers.json:ro
+    ports:
+      - 9129:8080
+
 ##############  TEST CONTAINER  ###############################################################
   test-container:
     image: alpine
+    depends_on:
+      - pg
+      - mysql
+      - speedtest-alpine-mysql
+      - speedtest-alpine-pg
     volumes:
       - ./test-script.sh:/test-script.sh
     command:
diff --git a/docker/test/servers.json b/docker/test/servers.json
new file mode 100644
index 000000000..f067463a0
--- /dev/null
+++ b/docker/test/servers.json
@@ -0,0 +1,409 @@
+[
+  {
+    "name": "Amsterdam, Netherlands (Clouvider)",
+    "server": "//ams.speedtest.clouvider.net/backend",
+    "id": 51,
+    "dlURL": "garbage.php",
+    "ulURL": "empty.php",
+    "pingURL": "empty.php",
+    "getIpURL": "getIP.php",
+    "sponsorName": "Clouvider",
+    "sponsorURL": "https://www.clouvider.co.uk/"
+  },
+  {
+    "name": "Amsterdam, Netherlands (Sharktech)",
+    "server": "https://amsspeed.sharktech.net",
+    "id": 94,
+    "dlURL": "backend/garbage.php",
+    "ulURL": "backend/empty.php",
+    "pingURL": "backend/empty.php",
+    "getIpURL": "backend/getIP.php",
+    "sponsorName": "Sharktech",
+    "sponsorURL": "https://sharktech.net"
+  },
+  {
+    "name": "Atlanta, United States (Clouvider)",
+    "server": "//atl.speedtest.clouvider.net/backend",
+    "id": 53,
+    "dlURL": "garbage.php",
+    "ulURL": "empty.php",
+    "pingURL": "empty.php",
+    "getIpURL": "getIP.php",
+    "sponsorName": "Clouvider",
+    "sponsorURL": "https://www.clouvider.co.uk/"
+  },
+  {
+    "name": "Bangalore, India (DigitalOcean)",
+    "server": "//in1.backend.librespeed.org/",
+    "id": 75,
+    "dlURL": "garbage.php",
+    "ulURL": "empty.php",
+    "pingURL": "empty.php",
+    "getIpURL": "getIP.php",
+    "sponsorName": "DigitalOcean",
+    "sponsorURL": "https://www.digitalocean.com"
+  },
+  {
+    "name": "Bari, Italy (GARR)",
+    "server": "https://st-be-ba1.infra.garr.it",
+    "id": 33,
+    "dlURL": "garbage.php",
+    "ulURL": "empty.php",
+    "pingURL": "empty.php",
+    "getIpURL": "getIP.php",
+    "sponsorName": "Consortium GARR",
+    "sponsorURL": "//garr.it"
+  },
+  {
+    "name": "Bologna, Italy (GARR)",
+    "server": "https://st-be-bo1.infra.garr.it",
+    "id": 34,
+    "dlURL": "garbage.php",
+    "ulURL": "empty.php",
+    "pingURL": "empty.php",
+    "getIpURL": "getIP.php",
+    "sponsorName": "Consortium GARR",
+    "sponsorURL": "//garr.it"
+  },
+  {
+    "name": "Chicago, USA (Sharktech)",
+    "server": "https://chispeed.sharktech.net",
+    "id": 93,
+    "dlURL": "backend/garbage.php",
+    "ulURL": "backend/empty.php",
+    "pingURL": "backend/empty.php",
+    "getIpURL": "backend/getIP.php",
+    "sponsorName": "Sharktech",
+    "sponsorURL": "https://sharktech.net"
+  },
+  {
+    "name": "Denver, USA (Sharktech)",
+    "server": "https://denspeed.sharktech.net",
+    "id": 92,
+    "dlURL": "backend/garbage.php",
+    "ulURL": "backend/empty.php",
+    "pingURL": "backend/empty.php",
+    "getIpURL": "backend/getIP.php",
+    "sponsorName": "Sharktech",
+    "sponsorURL": "https://sharktech.net"
+  },
+  {
+    "name": "Frankfurt, Germany (Clouvider)",
+    "server": "//fra.speedtest.clouvider.net/backend",
+    "id": 50,
+    "dlURL": "garbage.php",
+    "ulURL": "empty.php",
+    "pingURL": "empty.php",
+    "getIpURL": "getIP.php",
+    "sponsorName": "Clouvider",
+    "sponsorURL": "https://www.clouvider.co.uk/"
+  },
+  {
+    "name": "Frankfurt, Germany (FRA01)",
+    "server": "https://speedtest.lumischvps.cloud/",
+    "id": 86,
+    "dlURL": "backend/garbage.php",
+    "ulURL": "backend/empty.php",
+    "pingURL": "backend/empty.php",
+    "getIpURL": "backend/getIP.php",
+    "sponsorName": "LumischVPS",
+    "sponsorURL": "https://discord.gg/GxYzPwJmA2"
+  },
+  {
+    "name": "Ghom, Iran (Amin IDC)",
+    "server": "https://fastme.ir/",
+    "id": 77,
+    "dlURL": "backend/garbage.php",
+    "ulURL": "backend/empty.php",
+    "pingURL": "backend/empty.php",
+    "getIpURL": "backend/getIP.php",
+    "sponsorName": "Bardia Moshiri",
+    "sponsorURL": "https://bardia.tech/"
+  },
+  {
+    "name": "Helsinki, Finland (3) (Hetzner)",
+    "server": "//finew.openspeed.org/",
+    "id": 22,
+    "dlURL": "backend437/garbage.php",
+    "ulURL": "backend437/empty.php",
+    "pingURL": "backend437/empty.php",
+    "getIpURL": "backend437/getIP.php",
+    "sponsorName": "Daily Health Insurance Group",
+    "sponsorURL": "//dhig.net/"
+  },
+  {
+    "name": "Helsinki, Finland (5) (Hetzner)",
+    "server": "//fast.kabi.tk/",
+    "id": 24,
+    "dlURL": "garbage.php",
+    "ulURL": "empty.php",
+    "pingURL": "empty.php",
+    "getIpURL": "getIP.php",
+    "sponsorName": "KABI.tk",
+    "sponsorURL": "//kabi.tk"
+  },
+  {
+    "name": "Johannesburg, South Africa (Host Africa)",
+    "server": "//za1.backend.librespeed.org/",
+    "id": 70,
+    "dlURL": "garbage.php",
+    "ulURL": "empty.php",
+    "pingURL": "empty.php",
+    "getIpURL": "getIP.php",
+    "sponsorName": "HOSTAFRICA",
+    "sponsorURL": "https://www.hostafrica.co.za"
+  },
+  {
+    "name": "Las Vegas, USA (Sharktech)",
+    "server": "https://lasspeed.sharktech.net",
+    "id": 90,
+    "dlURL": "backend/garbage.php",
+    "ulURL": "backend/empty.php",
+    "pingURL": "backend/empty.php",
+    "getIpURL": "backend/getIP.php",
+    "sponsorName": "Sharktech",
+    "sponsorURL": "https://sharktech.net"
+  },
+  {
+    "name": "London, England (Clouvider)",
+    "server": "//lon.speedtest.clouvider.net/backend",
+    "id": 49,
+    "dlURL": "garbage.php",
+    "ulURL": "empty.php",
+    "pingURL": "empty.php",
+    "getIpURL": "getIP.php",
+    "sponsorName": "Clouvider",
+    "sponsorURL": "https://www.clouvider.co.uk/"
+  },
+  {
+    "name": "Los Angeles, United States (1) (Clouvider)",
+    "server": "//la.speedtest.clouvider.net/backend",
+    "id": 54,
+    "dlURL": "garbage.php",
+    "ulURL": "empty.php",
+    "pingURL": "empty.php",
+    "getIpURL": "getIP.php",
+    "sponsorName": "Clouvider",
+    "sponsorURL": "https://www.clouvider.co.uk/"
+  },
+  {
+    "name": "Los Angeles, USA (Sharktech)",
+    "server": "https://laxspeed.sharktech.net",
+    "id": 91,
+    "dlURL": "backend/garbage.php",
+    "ulURL": "backend/empty.php",
+    "pingURL": "backend/empty.php",
+    "getIpURL": "backend/getIP.php",
+    "sponsorName": "Sharktech",
+    "sponsorURL": "https://sharktech.net"
+  },
+  {
+    "name": "New York, United States (2) (Clouvider)",
+    "server": "//nyc.speedtest.clouvider.net/backend",
+    "id": 52,
+    "dlURL": "garbage.php",
+    "ulURL": "empty.php",
+    "pingURL": "empty.php",
+    "getIpURL": "getIP.php",
+    "sponsorName": "Clouvider",
+    "sponsorURL": "https://www.clouvider.co.uk/"
+  },
+  {
+    "name": "Nottingham, England (LayerIP)",
+    "server": "https://uk1.backend.librespeed.org",
+    "id": 43,
+    "dlURL": "garbage.php",
+    "ulURL": "empty.php",
+    "pingURL": "empty.php",
+    "getIpURL": "getIP.php",
+    "sponsorName": "fosshost.org",
+    "sponsorURL": "https://fosshost.org"
+  },
+  {
+    "name": "Nuremberg, Germany (1) (Hetzner)",
+    "server": "//de1.backend.librespeed.org",
+    "id": 28,
+    "dlURL": "garbage.php",
+    "ulURL": "empty.php",
+    "pingURL": "empty.php",
+    "getIpURL": "getIP.php",
+    "sponsorName": "Snopyta",
+    "sponsorURL": "https://snopyta.org"
+  },
+  {
+    "name": "Nuremberg, Germany (2) (Hetzner)",
+    "server": "//de4.backend.librespeed.org",
+    "id": 27,
+    "dlURL": "garbage.php",
+    "ulURL": "empty.php",
+    "pingURL": "empty.php",
+    "getIpURL": "getIP.php",
+    "sponsorName": "LibreSpeed",
+    "sponsorURL": "https://librespeed.org"
+  },
+  {
+    "name": "Nuremberg, Germany (3) (Hetzner)",
+    "server": "//de3.backend.librespeed.org",
+    "id": 30,
+    "dlURL": "garbage.php",
+    "ulURL": "empty.php",
+    "pingURL": "empty.php",
+    "getIpURL": "getIP.php",
+    "sponsorName": "LibreSpeed",
+    "sponsorURL": "https://librespeed.org"
+  },
+  {
+    "name": "Nuremberg, Germany (4) (Hetzner)",
+    "server": "//de5.backend.librespeed.org",
+    "id": 31,
+    "dlURL": "garbage.php",
+    "ulURL": "empty.php",
+    "pingURL": "empty.php",
+    "getIpURL": "getIP.php",
+    "sponsorName": "LibreSpeed",
+    "sponsorURL": "https://librespeed.org"
+  },
+  {
+    "name": "Nuremberg, Germany (6) (Hetzner)",
+    "server": "//librespeed.lukas-heinrich.com/",
+    "id": 46,
+    "dlURL": "garbage.php",
+    "ulURL": "empty.php",
+    "pingURL": "empty.php",
+    "getIpURL": "getIP.php",
+    "sponsorName": "luki9100",
+    "sponsorURL": "https://lukas-heinrich.com/"
+  },
+  {
+    "name": "Ohio, USA (Rust backend)",
+    "server": "https://librespeed-rs.ir/",
+    "id": 95,
+    "dlURL": "backend/garbage",
+    "ulURL": "backend/empty",
+    "pingURL": "backend/empty",
+    "getIpURL": "backend/getIP",
+    "sponsorName": "Sudo Dios",
+    "sponsorURL": "https://github.com/SudoDios"
+  },
+  {
+    "name": "Poznan, Poland (INEA)",
+    "server": "https://speedtest.kamilszczepanski.com",
+    "id": 74,
+    "dlURL": "garbage.php",
+    "ulURL": "empty.php",
+    "pingURL": "empty.php",
+    "getIpURL": "getIP.php",
+    "sponsorName": "Kamil Szczepański",
+    "sponsorURL": "https://kamilszczepanski.com"
+  },
+  {
+    "name": "Prague, Czech Republic (CESNET)",
+    "server": "//speedtest.cesnet.cz",
+    "id": 79,
+    "dlURL": "backend/garbage.php",
+    "ulURL": "backend/empty.php",
+    "pingURL": "backend/empty.php",
+    "getIpURL": "backend/getIP.php",
+    "sponsorName": "CESNET",
+    "sponsorURL": "https://www.cesnet.cz"
+  },
+  {
+    "name": "Prague, Czech Republic (Turris)",
+    "server": "//librespeed.turris.cz",
+    "id": 85,
+    "dlURL": "backend/garbage.php",
+    "ulURL": "backend/empty.php",
+    "pingURL": "backend/empty.php",
+    "getIpURL": "backend/getIP.php",
+    "sponsorName": "Turris",
+    "sponsorURL": "https://www.turris.com"
+  },
+  {
+    "name": "Roma, Italy (GARR)",
+    "server": "https://st-be-rm2.infra.garr.it",
+    "id": 35,
+    "dlURL": "garbage.php",
+    "ulURL": "empty.php",
+    "pingURL": "empty.php",
+    "getIpURL": "getIP.php",
+    "sponsorName": "Consortium GARR",
+    "sponsorURL": "//garr.it"
+  },
+  {
+    "name": "Serbia (SOX)",
+    "server": "https://speedtest2.sox.rs",
+    "id": 87,
+    "dlURL": "libre/backend/garbage.php",
+    "ulURL": "libre/backend/empty.php",
+    "pingURL": "libre/backend/empty.php",
+    "getIpURL": "libre/backend/getIP.php",
+    "sponsorName": "Serbian Open eXchange (SOX)",
+    "sponsorURL": "https://sox.rs"
+  },
+  {
+    "name": "Singapore (Salvatore Cahyo)",
+    "server": "https://speedtest.dsgroupmedia.com",
+    "id": 68,
+    "dlURL": "backend/garbage.php",
+    "ulURL": "backend/empty.php",
+    "pingURL": "backend/empty.php",
+    "getIpURL": "backend/getIP.php",
+    "sponsorName": "Salvatore Cahyo",
+    "sponsorURL": "https://salvatorecahyo.my.id"
+  },
+  {
+    "name": "Tehran, Iran (Fanava)",
+    "server": "https://speedme.ir/",
+    "id": 76,
+    "dlURL": "backend/garbage.php",
+    "ulURL": "backend/empty.php",
+    "pingURL": "backend/empty.php",
+    "getIpURL": "backend/getIP.php",
+    "sponsorName": "Bardia Moshiri",
+    "sponsorURL": "https://bardia.tech"
+  },
+  {
+    "name": "Tehran, Iran (Faraso)",
+    "server": "https://st.bardia.tech",
+    "id": 80,
+    "dlURL": "backend/garbage.php",
+    "ulURL": "backend/empty.php",
+    "pingURL": "backend/empty.php",
+    "getIpURL": "backend/getIP.php",
+    "sponsorName": "Bardia Moshiri",
+    "sponsorURL": "https://bardia.tech/"
+  },
+  {
+    "name": "Tokyo, Japan (A573)",
+    "server": "https://librespeed.a573.net/",
+    "id": 82,
+    "dlURL": "backend/garbage.php",
+    "ulURL": "backend/empty.php",
+    "pingURL": "backend/empty.php",
+    "getIpURL": "backend/getIP.php",
+    "sponsorName": "A573",
+    "sponsorURL": "https://mirror.a573.net/"
+  },
+  {
+    "name": "Vilnius, Lithuania (RackRay)",
+    "server": "//lt1.backend.librespeed.org/",
+    "id": 69,
+    "dlURL": "garbage.php",
+    "ulURL": "empty.php",
+    "pingURL": "empty.php",
+    "getIpURL": "getIP.php",
+    "sponsorName": "Time4VPS",
+    "sponsorURL": "https://www.time4vps.com"
+  },
+  {
+    "name": "Virginia, United States, OVH",
+    "server": "https://speed.riverside.rocks/",
+    "id": 78,
+    "dlURL": "garbage.php",
+    "ulURL": "empty.php",
+    "pingURL": "empty.php",
+    "getIpURL": "getIP.php",
+    "sponsorName": "Riverside Rocks",
+    "sponsorURL": "https://riverside.rocks"
+  }
+]
diff --git a/docker/test/test-script.sh b/docker/test/test-script.sh
index 27d236014..1e8661bd6 100644
--- a/docker/test/test-script.sh
+++ b/docker/test/test-script.sh
@@ -1,9 +1,16 @@
+#!/bin/sh
+
+## simple script to call sanitycheck on all containers
+
 PORT=8080
 
-apk add w3m
+if ! apk add w3m; then
+    echo "Failed to install w3m package"
+    exit 1
+fi
 
 echo sleeping a little to get things setteled...
-sleep 10
+sleep 15
 
 for db in sqlite pg mysql; do
   for distro in alpine debian; do
diff --git a/docker/ui.php b/docker/ui.php
index 2d0723540..4f2d6972d 100755
--- a/docker/ui.php
+++ b/docker/ui.php
@@ -11,12 +11,24 @@ function I(i){return document.getElementById(i);}
 //LIST OF TEST SERVERS. See documentation for details if needed
 <?php
 $mode=getenv("MODE");
-if($mode=="standalone" || $mode=="dual"){ ?>
+if($mode=="standalone" || $mode=="backend"){ ?>
 var SPEEDTEST_SERVERS=[];
 <?php } else { ?>
 var SPEEDTEST_SERVERS= <?= file_get_contents('/servers.json') ?: '[]' ?>;
+<?php } 
+if ($mode=="dual"){ ?>
+// add own server in dual mode
+SPEEDTEST_SERVERS.unshift({
+	"name":"This Server",
+	"server":document.location.href+"backend/",
+	"id":1,
+	"dlURL":"garbage.php",
+	"ulURL":"empty.php",
+	"pingURL":"empty.php",
+	"getIpURL":"getIP.php",
+	"pingT":-1
+})
 <?php } ?>
-
 //INITIALIZE SPEED TEST
 var s=new Speedtest(); //create speed test object
 <?php if(getenv("TELEMETRY")=="true"){ ?>