build: reduce the image size by introducing multi stage build

longhorn/longhorn 5911

Signed-off-by: Jack Lin <jack.lin@suse.com>

package/Dockerfile

@@ -1,40 +1,58 @@
-FROM registry.suse.com/bci/bci-base:15.5
+FROM registry.suse.com/bci/bci-base:15.5 AS builder
 
 ARG ARCH=amd64
 
 RUN zypper -n addrepo --refresh https://download.opensuse.org/repositories/system:/snappy/SLE_15/system:snappy.repo && \
     zypper -n addrepo --refresh https://download.opensuse.org/repositories/network:/utilities/SLE_15_SP5/network:utilities.repo && \
     zypper --gpg-auto-import-keys ref
 
-RUN if [ ${ARCH} == "amd64" ]; then \
-        zypper -n install autoconf libtool libunwind-devel gcc-c++; \
-    fi
-
-RUN zypper -n install cmake kmod curl nfs-client nfs4-acl-tools fuse git gcc \
-    libibverbs librdmacm1 rdma-core-devel perl-Config-General libaio1 sg3_utils \
-    iputils telnet iperf qemu-tools wget iproute2 xsltproc docbook-xsl-stylesheets e2fsprogs cifs-utils && \
+RUN zypper -n install cmake curl git gcc wget xsltproc docbook-xsl-stylesheets && \
     rm -rf /var/cache/zypp/*
 
-# Install grpc_health_probe
-RUN wget https://github.com/grpc-ecosystem/grpc-health-probe/releases/download/v0.4.21/grpc_health_probe-linux-${ARCH} -O /usr/local/bin/grpc_health_probe && \
-    chmod +x /usr/local/bin/grpc_health_probe
-
 # Build liblonghorn
+ENV LIBLONGHORN_COMMIT_ID 53d1c063b95efc8d949b095bd4bf04637230265f
 RUN cd /usr/src && \
     git clone https://github.com/rancher/liblonghorn.git && \
     cd liblonghorn && \
-    git checkout 53d1c063b95efc8d949b095bd4bf04637230265f && \
+    git checkout ${LIBLONGHORN_COMMIT_ID} && \
     make; \
     make install
 
 # Build TGT
+ENV TGT_COMMIT_ID 3a8bc4823b5390e046f7aa8231ed262c0365c42c
 RUN cd /usr/src && \
     git clone https://github.com/rancher/tgt.git && \
     cd tgt && \
-    git checkout 3a8bc4823b5390e046f7aa8231ed262c0365c42c && \
+    git checkout ${TGT_COMMIT_ID} && \
     make; \
     make install
 
+# Install grpc_health_probe
+RUN wget https://github.com/grpc-ecosystem/grpc-health-probe/releases/download/v0.4.21/grpc_health_probe-linux-${ARCH} -O /usr/local/bin/grpc_health_probe && \
+    chmod +x /usr/local/bin/grpc_health_probe
+
+FROM registry.suse.com/bci/bci-base:15.5 AS release
+
+ARG ARCH=amd64
+
+RUN zypper -n addrepo --refresh https://download.opensuse.org/repositories/system:/snappy/SLE_15/system:snappy.repo && \
+    zypper -n addrepo --refresh https://download.opensuse.org/repositories/network:/utilities/SLE_15_SP5/network:utilities.repo && \
+    zypper --gpg-auto-import-keys ref
+
+RUN zypper -n install nfs-client nfs4-acl-tools cifs-utils libaio1 sg3_utils \
+    iputils iproute2 qemu-tools e2fsprogs && \
+    rm -rf /var/cache/zypp/*
+
+# Copy pre-built binaries from builder
+COPY --from=builder \
+    /usr/local/bin/grpc_health_probe \
+    /usr/sbin/tgt-admin \
+    /usr/sbin/tgt-setup-lun \
+    /usr/sbin/tgtadm \
+    /usr/sbin/tgtd \
+    /usr/sbin/tgtimg \
+    /usr/local/bin/
+
 COPY bin/longhorn bin/longhorn-instance-manager /usr/local/bin/
 
 COPY package/launch-simple-longhorn package/engine-manager package/launch-simple-file /usr/local/bin/

scripts/package

@@ -33,8 +33,10 @@ fi
 cp /usr/local/bin/longhorn-instance-manager ./bin/
 
 # update base image to get latest changes
-BASE_IMAGE=`grep FROM package/Dockerfile  | awk '{print $2}'`
-docker pull ${BASE_IMAGE}
+grep FROM package/Dockerfile | awk '{print $2}' | while read -r BASE_IMAGE
+do
+    docker pull "$BASE_IMAGE"
+done
 
 docker build --build-arg ARCH=${ARCH} -t ${IMAGE} -f package/Dockerfile .