diff --git a/Dockerfile b/Dockerfile
index 84716077..8652931d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,22 +5,38 @@ WORKDIR "$APP_DIR"
 COPY package*.json "$APP_DIR/"
 RUN npm install
 COPY . "$APP_DIR"
-RUN npm run server-build
-RUN npm run client-build
+RUN npm run server-build && npm run client-build
 
 # production image
 FROM node:buster-slim
 ENV APP_DIR=/app
 WORKDIR "$APP_DIR"
-# Install sane
-RUN apt-get update && apt-get install -yq sane sane-utils imagemagick tesseract-ocr
-RUN sed -i 's/policy domain="coder" rights="none" pattern="PDF"/policy domain="coder" rights="read | write" pattern="PDF"'/ /etc/ImageMagick-6/policy.xml
 COPY --from=builder "$APP_DIR/dist" "$APP_DIR/"
 
-# Install dependencies
+RUN apt-get update && \
+  apt-get install -yq curl gpg && \
+  echo 'deb http://download.opensuse.org/repositories/home:/pzz/Debian_10/ /' | tee /etc/apt/sources.list.d/home:pzz.list && \
+  curl -fsSL https://download.opensuse.org/repositories/home:pzz/Debian_10/Release.key | gpg --dearmor | tee /etc/apt/trusted.gpg.d/home:pzz.gpg > /dev/null && \
+  apt-get update && \
+  apt-get install -yq sane sane-utils imagemagick tesseract-ocr sane-airscan && \
+  sed -i 's/policy domain="coder" rights="none" pattern="PDF"/policy domain="coder" rights="read | write" pattern="PDF"'/ /etc/ImageMagick-6/policy.xml
+
 RUN npm install --production
 
-ENV NET_HOST=""
+# This goes into /etc/sane.d/net.conf
+ENV SANED_NET_HOSTS=""
+
+# This gets added to /etc/sane.d/airscan.conf
+ENV AIRSCAN_DEVICES=""
+
+# This directs scanserv not to bother querying `scanimage -L`
+ENV SCANIMAGE_LIST_IGNORE=""
+
+# This gets added to scanservjs/config/config.js:devices
+ENV DEVICES=""
+
+# Override OCR language
+ENV OCR_LANG=""
 
 # Copy entry point
 COPY run.sh /run.sh
diff --git a/client/components/Scanserv.vue b/client/components/Scanserv.vue
index 7cd6ff24..8ac80c81 100644
--- a/client/components/Scanserv.vue
+++ b/client/components/Scanserv.vue
@@ -381,13 +381,21 @@ export default {
 
       return this._fetch(url).then(context => {
         this.context = context;
-        this.device = context.devices[0];
-        this.$refs.toastr.i(`Found device ${this.device.id}`);
-        this.request = this.readRequest();
-        for (let test of context.diagnostics) {
-          const toast = test.success ? this.$refs.toastr.s : this.$refs.toastr.e;
-          toast(test.message);
+
+        if (context.devices.length > 0) {
+          for (let device of context.devices) {
+            this.$refs.toastr.i(`Found device ${device.id}`);
+          }
+          this.device = context.devices[0];
+          this.request = this.readRequest();
+          for (let test of context.diagnostics) {
+            const toast = test.success ? this.$refs.toastr.s : this.$refs.toastr.e;
+            toast(test.message);
+          }
+        } else {
+          this.$refs.toastr.e('Found no devices');
         }
+
         if (force) {
           this.clear();
           this.readPreview();
diff --git a/config/config.js b/config/config.js
index 7d438a6d..ea5f01af 100644
--- a/config/config.js
+++ b/config/config.js
@@ -5,9 +5,6 @@ const Config = {};
 // Things to change
 Config.port = 8080;
 
-// scanservjs will attempt to find scanners locally using `scanimage -L` but you
-// will need to manually add network devices here which will be appended. e.g.
-// Config.devices = ['net:192.168.0.10:airscan:e0:Canon TR8500 series'];
 Config.devices = [];
 Config.ocrLanguage = 'eng';
 Config.log = {};
@@ -177,4 +174,27 @@ if (Config.tesseract) {
   ]);
 }
 
+// Process environment variables
+
+// scanservjs will attempt to find scanners locally using `scanimage -L` but
+// sometimes you may need to manually add network devices here if they're not
+// found e.g.
+// Config.devices = ['net:192.168.0.10:airscan:e0:Canon TR8500 series'];
+// This is done with an environment variable. Multiple entries are separated by
+// semicolons
+if (process.env.DEVICES !== undefined && process.env.DEVICES.length > 0) {
+  Config.devices = process.env.DEVICES.split(';');
+}
+
+// scanservjs will attempt to find scanners locally using `scanimage -L` but
+// sometimes it will return nothing. If you are specifying devices manually you
+// may also with to turn off the find.
+Config.devicesFind = process.env.SCANIMAGE_LIST_IGNORE === undefined
+  || process.env.SCANIMAGE_LIST_IGNORE.length === 0;
+
+// Override the OCR language here
+if (process.env.OCR_LANG !== undefined && process.env.OCR_LANG.length > 0) {
+  Config.ocrLanguage = process.env.OCR_LANG;
+}
+
 module.exports = Config;
diff --git a/docs/development.md b/docs/development.md
index a7e49d91..32e3ff26 100644
--- a/docs/development.md
+++ b/docs/development.md
@@ -54,6 +54,10 @@ gulp release
 Install docker
 ```
 sudo apt install docker.io
+sudo systemctl unmask docker
+sudo systemctl start docker
+
+# Hack to make docker accessible.
 sudo chmod 666 /var/run/docker.sock
 ```
 
diff --git a/run.sh b/run.sh
index cef28ccd..8e973bd9 100644
--- a/run.sh
+++ b/run.sh
@@ -1,5 +1,31 @@
 #!/bin/sh
 set -xve
-[ ! -z "$NET_HOST" ] && echo $NET_HOST > /etc/sane.d/net.conf
+
+# turn off globbing
+set -f
+
+# split at newlines only (airscan devices can have spaces in)
+IFS='
+'
+
+# Insert a list of net hosts
+if [ ! -z "$SANED_NET_HOSTS" ]; then
+  hosts=$(echo $SANED_NET_HOSTS | sed "s/;/\n/")
+  for host in $hosts; do
+    echo $host >> /etc/sane.d/net.conf
+  done
+fi
+
+# Insert airscan devices
+if [ ! -z "$AIRSCAN_DEVICES" ]; then
+  devices=$(echo $AIRSCAN_DEVICES | sed "s/;/\n/")
+  for device in $devices; do
+    sed -i "/^\[devices\]/a $device" /etc/sane.d/airscan.conf
+  done
+fi
+
+unset IFS
+set +f
+
 node ./server/server.js
 
diff --git a/server/devices.js b/server/devices.js
index 34ea5ded..1b9a2858 100644
--- a/server/devices.js
+++ b/server/devices.js
@@ -56,14 +56,17 @@ class Devices {
     }
 
     if (devices === null) {
-      let data = await Process.execute(Scanimage.devices());
-      log.debug('Device list: ', data);
-      const localDevices = Devices._parseDevices(data);
-      const deviceIds = localDevices.concat(Config.devices);
+      let deviceIds = Config.devices;
+      if (Config.devicesFind) {
+        const data = await Process.execute(Scanimage.devices());
+        log.debug('Device list: ', data);
+        const localDevices = Devices._parseDevices(data);
+        deviceIds = deviceIds.concat(localDevices);
+      }
 
       devices = [];
       for (let deviceId of deviceIds) {
-        data = await Process.execute(Scanimage.features(deviceId));
+        const data = await Process.execute(Scanimage.features(deviceId));
         log.debug('Device features: ', data);
         devices.push(Device.from(data));
       }