Attempt to fix problem with Nexus getting stuck while running with too little memory

CHANGELOG.md

@@ -27,6 +27,7 @@ BUG FIXES:
 - Fix Dockerfile 'as' casting ([#4170](https://github.com/microsoft/AzureTRE/pull/4170))
 - Create policy to allow all user to configure color profiles to remove auth dialog. ([#4184](https://github.com/microsoft/AzureTRE/pull/4184))
 - Pre configure VS code option to prevent script failure ([#4185](https://github.com/microsoft/AzureTRE/pull/4185))
+- Increase size of Nexus VM, and derive Java VM memory limits from machine size ([#4074](https://github.com/microsoft/AzureTRE/issues/4074))
 
 COMPONENTS:
 

templates/shared_services/sonatype-nexus-vm/porter.yaml

@@ -1,7 +1,7 @@
 ---
 schemaVersion: 1.0.0
 name: tre-shared-service-sonatype-nexus
-version: 3.1.1
+version: 3.1.2
 description: "A Sonatype Nexus shared service"
 dockerfile: Dockerfile.tmpl
 registry: azuretre

templates/shared_services/sonatype-nexus-vm/scripts/deploy_nexus_container.sh

@@ -20,7 +20,18 @@ while true; do
   ((docker_pull_timeout--));
 done
 
+# Deduce memory available to Java. Either 3/4 of the system RAM, or a set minimum
+# shellcheck disable=SC2002
+mem_total_mb=$(( $(cat /proc/meminfo | head -1 | awk '{ print $2 }') / 1024 ))
+java_mem=2703
+if [ $mem_total_mb -gt 4096 ]; then
+  java_mem=$(( mem_total_mb * 3 / 4 ))
+fi
+
+echo "System memory: ${mem_total_mb} MB. Java memory: ${java_mem} MB"
+
 docker run -d -p 80:8081 -p 443:8443 -p 8083:8083 -v /etc/nexus-data:/nexus-data \
+    -e INSTALL4J_ADD_VM_PARAMS="-Xmx${java_mem}m -Xms${java_mem}m" \
     --restart always \
     --name nexus \
     --log-driver local \

templates/shared_services/sonatype-nexus-vm/terraform/vm.tf

@@ -98,7 +98,7 @@ resource "azurerm_linux_virtual_machine" "nexus" {
   resource_group_name             = local.core_resource_group_name
   location                        = data.azurerm_resource_group.rg.location
   network_interface_ids           = [azurerm_network_interface.nexus.id]
-  size                            = "Standard_B2s"
+  size                            = "Standard_B8ms"
   disable_password_authentication = false
   admin_username                  = "adminuser"
   admin_password                  = random_password.nexus_vm_password.result