From 73ffc37abbcede36ebe00c74ab9bba1c1fef76eb Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Thu, 8 Jan 2026 20:07:10 +0000
Subject: [PATCH 1/4] Initial plan


From c0c1e8d47410b3ba29427fd85a47d4680fe53078 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Thu, 8 Jan 2026 20:09:39 +0000
Subject: [PATCH 2/4] Update arm64 builds from Mariner 2 to Azure Linux 3

Co-authored-by: lbussell <36081148+lbussell@users.noreply.github.com>
---
 eng/docker-tools/templates/stages/dotnet/build-and-test.yml | 3 ++-
 eng/docker-tools/templates/variables/dotnet/common.yml      | 6 ++++--
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/eng/docker-tools/templates/stages/dotnet/build-and-test.yml b/eng/docker-tools/templates/stages/dotnet/build-and-test.yml
index 311b16133..4e3059ab5 100644
--- a/eng/docker-tools/templates/stages/dotnet/build-and-test.yml
+++ b/eng/docker-tools/templates/stages/dotnet/build-and-test.yml
@@ -80,11 +80,12 @@ stages:
     linuxArm64Pool:
       os: linux
       hostArchitecture: Arm64
-      image: $(linuxArm64PoolImage)
       ${{ if eq(variables['System.TeamProject'], parameters.publicProjectName) }}:
         name: $(linuxArm64PublicPoolName)
+        image: $(linuxArm64PublicPoolImage)
       ${{ if eq(variables['System.TeamProject'], parameters.internalProjectName) }}:
         name: $(linuxArm64InternalPoolName)
+        image: $(linuxArm64InternalPoolImage)
 
     # Linux Arm32
     linuxArm32Pool:
diff --git a/eng/docker-tools/templates/variables/dotnet/common.yml b/eng/docker-tools/templates/variables/dotnet/common.yml
index 8f98c0921..3d313a3c6 100644
--- a/eng/docker-tools/templates/variables/dotnet/common.yml
+++ b/eng/docker-tools/templates/variables/dotnet/common.yml
@@ -18,8 +18,10 @@ variables:
 - name: linuxAmd64InternalPoolName
   value: NetCore1ESPool-Internal
 
-- name: linuxArm64PoolImage
-  value: Mariner-2-Docker-ARM64
+- name: linuxArm64PublicPoolImage
+  value: azure-linux-3-arm64-public
+- name: linuxArm64InternalPoolImage
+  value: azure-linux-3-arm64
 - name: linuxArm64PublicPoolName
   value: Docker-Linux-Arm-Public
 - name: linuxArm64InternalPoolName

From 75c3f4c15c31e6ed488ad94d9fc8b97c2e578890 Mon Sep 17 00:00:00 2001
From: Logan Bussell <loganbussell@microsoft.com>
Date: Thu, 8 Jan 2026 12:59:39 -0800
Subject: [PATCH 3/4] Update
 eng/docker-tools/templates/stages/dotnet/build-and-test.yml

---
 eng/docker-tools/templates/stages/dotnet/build-and-test.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/eng/docker-tools/templates/stages/dotnet/build-and-test.yml b/eng/docker-tools/templates/stages/dotnet/build-and-test.yml
index 4e3059ab5..f9e26f242 100644
--- a/eng/docker-tools/templates/stages/dotnet/build-and-test.yml
+++ b/eng/docker-tools/templates/stages/dotnet/build-and-test.yml
@@ -82,7 +82,7 @@ stages:
       hostArchitecture: Arm64
       ${{ if eq(variables['System.TeamProject'], parameters.publicProjectName) }}:
         name: $(linuxArm64PublicPoolName)
-        image: $(linuxArm64PublicPoolImage)
+        demands: ImageOverride -equals $(linuxArm64PublicPoolImage)
       ${{ if eq(variables['System.TeamProject'], parameters.internalProjectName) }}:
         name: $(linuxArm64InternalPoolName)
         image: $(linuxArm64InternalPoolImage)

From c15ec457d71c1fcfa1dd1b2faf9cacf6e3347030 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Thu, 8 Jan 2026 23:05:16 +0000
Subject: [PATCH 4/4] Update Arm32 build legs to use Azure Linux 3 images

Co-authored-by: lbussell <36081148+lbussell@users.noreply.github.com>
---
 eng/docker-tools/templates/stages/dotnet/build-and-test.yml | 3 ++-
 eng/docker-tools/templates/variables/dotnet/common.yml      | 6 ++++--
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/eng/docker-tools/templates/stages/dotnet/build-and-test.yml b/eng/docker-tools/templates/stages/dotnet/build-and-test.yml
index f9e26f242..30ec5240e 100644
--- a/eng/docker-tools/templates/stages/dotnet/build-and-test.yml
+++ b/eng/docker-tools/templates/stages/dotnet/build-and-test.yml
@@ -91,11 +91,12 @@ stages:
     linuxArm32Pool:
       os: linux
       hostArchitecture: Arm64
-      image: $(linuxArm32PoolImage)
       ${{ if eq(variables['System.TeamProject'], parameters.publicProjectName) }}:
         name: $(linuxArm32PublicPoolName)
+        demands: ImageOverride -equals $(linuxArm32PublicPoolImage)
       ${{ if eq(variables['System.TeamProject'], parameters.internalProjectName) }}:
         name: $(linuxArm32InternalPoolName)
+        image: $(linuxArm32InternalPoolImage)
 
     # Windows Server 2016
     windows2016Pool:
diff --git a/eng/docker-tools/templates/variables/dotnet/common.yml b/eng/docker-tools/templates/variables/dotnet/common.yml
index 3d313a3c6..31659f3d9 100644
--- a/eng/docker-tools/templates/variables/dotnet/common.yml
+++ b/eng/docker-tools/templates/variables/dotnet/common.yml
@@ -27,8 +27,10 @@ variables:
 - name: linuxArm64InternalPoolName
   value: Docker-Linux-Arm-Internal
 
-- name: linuxArm32PoolImage
-  value: Mariner-2-Docker-ARM64
+- name: linuxArm32PublicPoolImage
+  value: azure-linux-3-arm64-public
+- name: linuxArm32InternalPoolImage
+  value: azure-linux-3-arm64
 - name: linuxArm32PublicPoolName
   value: Docker-Linux-Arm-Public
 - name: linuxArm32InternalPoolName