Enhance DPI settings for Linux VM display (#4206)

Linux VM VDI image is blurred.
Fixes #4200

Co-authored-by: Tim Allen <tim.allen@cloudkubed.com>

CHANGELOG.md

@@ -25,6 +25,7 @@ ENHANCEMENTS:
 * Add option to configure auto shutdown for Linux VM  ([#4186](https://github.com/microsoft/AzureTRE/issues/4186))
 * Add ability to download VSCode Extensions ([[#4187](https://github.com/microsoft/AzureTRE/issues/4187)])
 * Update Windows VM Images ([#4198](https://github.com/microsoft/AzureTRE/pull/4198))
+* Enhance DPI of Linux display ([[#4200](https://github.com/microsoft/AzureTRE/issues/4200)])
 
 BUG FIXES:
 * Update KeyVault references in API to use the version so Terraform cascades the update ([#4112](https://github.com/microsoft/AzureTRE/pull/4112))

docs/tre-templates/user-resources/guacamole-linux-vm.md

@@ -15,5 +15,11 @@ It blocks all inbound and outbound traffic to the internet and allows only RDP c
 - In production we recommend using VM images to avoid transient issues downloading and installing packages. The included user resource templates for VMs with bootstrap scripts should only be used for trial/demonstration purposes. More info can be found [here](./custom.md).
 - Snap (app store for linux via [snapcraft.io](https://snapcraft.io)) hasn't been configured to work via the nexus proxy
 
+## Modifying the DPI of the Linux VM display
+
+Depending on the display resolution and your personal preference, you may want to adjust the DPI (Dots Per Inch) setting of your Linux VM to make text and UI elements appear larger or smaller, and hence clearer. This can be done by modifying the Xft.dpi value in `.Xresources` file.
+
+After running this command, you may need to run `reboot` to restart the VM so that the changes to take effect.
+
 ## Using Custom Images
 For custom image usage, visit this [page](./custom.md).

templates/workspace_services/guacamole/guacamole-server/docker/Dockerfile

@@ -53,7 +53,7 @@ COPY ./docker/services /etc/services.d/
 COPY --from=client_build /target/lib/* "${GUACAMOLE_LIB}"
 COPY --from=client_build "/target/guacamole-auth-tre-${GUACAMOLE_AZURE_VERSION}.jar" "${GUACAMOLE_HOME}/extensions/"
 
-RUN wget -O "${GUACAMOLE_HOME}/guacamole.war" "http://apache.org/dyn/closer.cgi?action=download&filename=guacamole/1.5.3/binary/guacamole-1.5.3.war" --progress=dot:giga
+RUN wget -O "${GUACAMOLE_HOME}/guacamole.war" "http://apache.org/dyn/closer.cgi?action=download&filename=guacamole/1.5.5/binary/guacamole-1.5.5.war" --progress=dot:giga
 
 ENV OAUTH2_PROXY_HOME=/etc/oauth2-proxy
 RUN OAUTH2_PROXY_ARCHIVE=oauth2-proxy.tar.gz && \

templates/workspace_services/guacamole/guacamole-server/docker/version.txt

@@ -1 +1 @@
-__version__ = "0.9.1"
+__version__ = "0.9.2"

templates/workspace_services/guacamole/porter.yaml

@@ -1,7 +1,7 @@
 ---
 schemaVersion: 1.0.0
 name: tre-service-guacamole
-version: 0.12.1
+version: 0.12.2
 description: "An Azure TRE service for Guacamole"
 dockerfile: Dockerfile.tmpl
 registry: azuretre

templates/workspace_services/guacamole/user_resources/guacamole-azure-linuxvm/terraform/vm_config.sh

@@ -152,6 +152,7 @@ sudo apt-get install -y ca-certificates curl gnupg lsb-release
 sudo apt-get install -y docker-compose-plugin docker-ce-cli containerd.io jq
 sudo apt-get install -y docker-ce
 jq -n --arg proxy "${NEXUS_PROXY_URL}:8083" '{"registry-mirrors": [$proxy]}' > /etc/docker/daemon.json
+sudo usermod -aG docker "${VM_USER}"
 sudo systemctl daemon-reload
 sudo systemctl restart docker
 
@@ -185,6 +186,7 @@ sudo adduser xrdp ssl-cert
 sudo -u "${VM_USER}" -i bash -c 'echo xfce4-session > ~/.xsession'
 sudo -u "${VM_USER}" -i bash -c 'echo xset s off >> ~/.xsession'
 sudo -u "${VM_USER}" -i bash -c 'echo xset -dpms >> ~/.xsession'
+sudo -u "${VM_USER}" -i bash -c 'echo Xft.dpi: 192 >> ~/.Xresources'
 
 # Fix for blank screen on DSVM (/sh -> /bash due to conflict with profile.d scripts)
 sudo sed -i 's|!/bin/sh|!/bin/bash|g' /etc/xrdp/startwm.sh