diff --git a/.pipelines/Dockerfile b/.pipelines/Dockerfile
index 3814f8a5e0..de6ea4ac25 100644
--- a/.pipelines/Dockerfile
+++ b/.pipelines/Dockerfile
@@ -1,4 +1,4 @@
-FROM docker.io/ubuntu:16.04
+FROM mcr.microsoft.com/oss/mirror/docker.io/library/ubuntu:18.04
 RUN apt-get update && apt-get install -y software-properties-common sudo wget apt-utils apt-transport-https curl lsb-release gnupg jq
 RUN wget -q https://packages.microsoft.com/config/ubuntu/20.04/packages-microsoft-prod.deb -O packages-microsoft-prod.deb
 RUN dpkg -i packages-microsoft-prod.deb
diff --git a/Dockerfile.build b/Dockerfile.build
deleted file mode 100644
index 7f3af09a7b..0000000000
--- a/Dockerfile.build
+++ /dev/null
@@ -1,9 +0,0 @@
-FROM docker.io/golang:1.18
-
-RUN apt-get update \
-    && apt-get install -y zip \
-    && apt-get install -y sudo libltdl-dev
-
-COPY . /go/src/github.com/Azure/azure-container-networking
-
-WORKDIR /go/src/github.com/Azure/azure-container-networking
diff --git a/Dockerfile.cnm b/Dockerfile.cnm
index 4a24eaf4b6..98e978be29 100644
--- a/Dockerfile.cnm
+++ b/Dockerfile.cnm
@@ -1,4 +1,4 @@
-FROM docker.io/ubuntu:16.04
+FROM mcr.microsoft.com/oss/mirror/docker.io/library/ubuntu:18.04
 ARG CNM_BUILD_DIR
 
 # Install dependencies.
diff --git a/cni/telemetry/Dockerfile b/cni/telemetry/Dockerfile
index 5076857c65..6bc205eaed 100644
--- a/cni/telemetry/Dockerfile
+++ b/cni/telemetry/Dockerfile
@@ -1,5 +1,4 @@
-# Use a minimal image as a parent image
-FROM docker.io/ubuntu:19.10
+FROM mcr.microsoft.com/oss/mirror/docker.io/library/ubuntu:20.04
 ARG TELEMETRY_BUILD_DIR
 ARG TELEMETRY_CONF_DIR
 
diff --git a/cns/Dockerfile b/cns/Dockerfile
index 89cb369d82..d4f73e5013 100644
--- a/cns/Dockerfile
+++ b/cns/Dockerfile
@@ -1,7 +1,7 @@
-FROM docker.io/alpine:latest as certs
-RUN apk --update add ca-certificates
+FROM mcr.microsoft.com/cbl-mariner/base/core:1.0 as certs
+RUN tdnf upgrade -y && tdnf install -y ca-certificates
 
-FROM docker.io/golang:1.18 AS builder
+FROM mcr.microsoft.com/oss/go/microsoft/golang:1.18 AS builder
 ARG VERSION
 ARG CNS_AI_PATH
 ARG CNS_AI_ID
diff --git a/cns/windows.Dockerfile b/cns/windows.Dockerfile
index 7dcbc1d224..47ae1c7ad9 100644
--- a/cns/windows.Dockerfile
+++ b/cns/windows.Dockerfile
@@ -1,5 +1,5 @@
 # Build cns
-FROM docker.io/golang:1.18 AS builder
+FROM mcr.microsoft.com/oss/go/microsoft/golang:1.18 AS builder
 # Build args
 ARG VERSION
 ARG CNS_AI_PATH
diff --git a/hack/toolbox/Dockerfile.windows b/hack/toolbox/Dockerfile.windows
index afdc87f2de..58a36490bc 100644
--- a/hack/toolbox/Dockerfile.windows
+++ b/hack/toolbox/Dockerfile.windows
@@ -1,5 +1,5 @@
 # Build cns
-FROM docker.io/golang:1.18 AS builder
+FROM mcr.microsoft.com/oss/go/microsoft/golang:1.18 AS builder
 # Build args
 ARG VERSION
 ARG CNS_AI_PATH
diff --git a/hack/toolbox/manifests/Dockerfile.heavy b/hack/toolbox/manifests/Dockerfile.heavy
index 443f62fcc7..4facd58202 100644
--- a/hack/toolbox/manifests/Dockerfile.heavy
+++ b/hack/toolbox/manifests/Dockerfile.heavy
@@ -1,4 +1,4 @@
-FROM docker.io/ubuntu:20.04
+FROM mcr.microsoft.com/oss/mirror/docker.io/library/ubuntu:20.04
 RUN apt-get update
 RUN apt-get install -y \
     python3 \
diff --git a/hack/toolbox/server/Dockerfile.heavy b/hack/toolbox/server/Dockerfile.heavy
index 62be6ffc6d..40084e22f7 100644
--- a/hack/toolbox/server/Dockerfile.heavy
+++ b/hack/toolbox/server/Dockerfile.heavy
@@ -1,4 +1,4 @@
-FROM docker.io/golang:alpine as build
+FROM mcr.microsoft.com/oss/go/microsoft/golang:1.18 as build
 ADD ./ /
 WORKDIR /
 RUN CGO_ENABLED=0 GOOS=linux go build -o server .
diff --git a/hack/toolbox/server/Dockerfile.lite b/hack/toolbox/server/Dockerfile.lite
index f42883f990..e4f3724f38 100644
--- a/hack/toolbox/server/Dockerfile.lite
+++ b/hack/toolbox/server/Dockerfile.lite
@@ -1,4 +1,4 @@
-FROM docker.io/golang as build
+FROM mcr.microsoft.com/oss/go/microsoft/golang:1.18 as build
 ADD ./server/server.go /
 WORKDIR /
 RUN CGO_ENABLED=0 GOOS=linux go build -o server .
diff --git a/npm/Dockerfile b/npm/Dockerfile
index 1df3c12e22..87679182c8 100644
--- a/npm/Dockerfile
+++ b/npm/Dockerfile
@@ -1,5 +1,5 @@
 # Build npm
-FROM docker.io/golang:1.18 AS builder
+FROM mcr.microsoft.com/oss/go/microsoft/golang:1.18 AS builder
 # Build args
 ARG VERSION
 ARG NPM_AI_PATH
@@ -14,7 +14,7 @@ COPY . .
 RUN CGO_ENABLED=1 go build -v -o /usr/local/bin/azure-npm -ldflags "-X main.version="$VERSION" -X "$NPM_AI_PATH"="$NPM_AI_ID"" -gcflags="-dwarflocationlists=true" npm/cmd/*.go
 
 # Use a minimal image as a final image base
-FROM docker.io/ubuntu:focal
+FROM mcr.microsoft.com/oss/mirror/docker.io/library/ubuntu:20.04
 
 # Copy into final image
 COPY --from=builder /usr/local/bin/azure-npm \
diff --git a/npm/Dockerfile.windows b/npm/Dockerfile.windows
index c526548233..c63b029e4c 100644
--- a/npm/Dockerfile.windows
+++ b/npm/Dockerfile.windows
@@ -1,4 +1,4 @@
-FROM docker.io/golang:windowsservercore-ltsc2022 AS builder
+FROM mcr.microsoft.com/oss/go/microsoft/golang:1.18-windowsservercore-ltsc2022 AS builder
 # Build args
 ARG VERSION
 ARG NPM_AI_PATH
diff --git a/tools/acncli/Dockerfile b/tools/acncli/Dockerfile
index 9b2f30f3fe..e9f9b9156e 100644
--- a/tools/acncli/Dockerfile
+++ b/tools/acncli/Dockerfile
@@ -1,4 +1,4 @@
-FROM docker.io/golang:1.18 as build
+FROM mcr.microsoft.com/oss/go/microsoft/golang:1.18 as build
 WORKDIR /go/src/github.com/Azure/azure-container-networking/
 ARG VERSION
 ARG PLATFORM