fix: modified container healthcheck to support custom port via -port/--port flag

deploy/Dockerfile

@@ -58,14 +58,23 @@ RUN apk --no-cache add libc6-compat device-mapper findutils ndctl thin-provision
 
 # Grab cadvisor,libpfm4 and libipmctl from "build" container if they exist (libipmctl only works on amd64/x86_64).
 COPY --from=build /usr/local/lib/libpfm.so* /usr/local/lib/
-COPY --from=build /usr/local/lib/libipmctl.so* /usr/local/lib/
+# Disable libipmctl due to https://github.com/google/cadvisor/issues/3482
+#COPY --from=build /usr/local/lib/libipmctl.so* /usr/local/lib/
 COPY --from=build /go/src/github.com/google/cadvisor/_output/cadvisor /usr/bin/cadvisor
 
+COPY deploy/entrypoint.sh /usr/bin/entrypoint.sh
+RUN chmod +x /usr/bin/entrypoint.sh
+
+COPY deploy/healthcheck.sh /usr/bin/healthcheck.sh
+RUN chmod +x /usr/bin/healthcheck.sh
+
+# Default port is 8080, but can be changed with -port flag
+# Users should expose their custom port with: docker run -p <custom>:<custom>
 EXPOSE 8080
 
-ENV CADVISOR_HEALTHCHECK_URL=http://localhost:8080/healthz
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s \
+  CMD /usr/bin/healthcheck.sh
 
-HEALTHCHECK --interval=30s --timeout=3s \
-  CMD wget --quiet --tries=1 --spider $CADVISOR_HEALTHCHECK_URL || exit 1
+# Use entrypoint wrapper
+ENTRYPOINT ["/usr/bin/entrypoint.sh"]
 
-ENTRYPOINT ["/usr/bin/cadvisor", "-logtostderr"]

deploy/entrypoint.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+# Copyright 2025 Google Inc. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -e
+
+# Execute cadvisor with all provided arguments
+exec /usr/bin/cadvisor -logtostderr "$@"

deploy/healthcheck.sh

@@ -0,0 +1,37 @@
+#!/bin/bash
+
+# Copyright 2025 Google Inc. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Default port
+PORT=8080
+
+# Extract port from the cadvisor process command line
+if [ -f /proc/1/cmdline ]; then
+    CMDLINE=$(tr '\0' ' ' < /proc/1/cmdline)
+
+    # Look for -port=XXXX or --port=XXXX
+    for arg in $CMDLINE; do
+        case "$arg" in
+            -port=*)
+                PORT="${arg#-port=}"
+                ;;
+            --port=*)
+                PORT="${arg#--port=}"
+                ;;
+        esac
+    done
+fi
+
+wget --quiet --tries=1 --spider "http://localhost:${PORT}/healthz" || exit 1