Github user MikeThomsen commented on a diff in the pull request:
https://github.com/apache/nifi/pull/2921#discussion_r206105937
--- Diff: nifi-docker/dockerhub/Dockerfile ---
@@ -23,11 +23,15 @@ LABEL site="https://nifi.apache.org";
ARG UID=1000
ARG GID=1000
ARG NIFI_VERSION=1.8.0
-ARG MIRROR=https://archive.apache.org/dist
+ARG MIRROR_BASE_URL=https://archive.apache.org/dist
+ARG ARCHIVE_BASE_URL=https://archive.apache.org/dist
+
+ENV NIFI_BASE_DIR=/opt/nifi
+ENV NIFI_HOME=${NIFI_BASE_DIR}/nifi-${NIFI_VERSION}
+
+ENV
NIFI_BINARY_PATH=${NIFI_BINARY_PATH:-/nifi/${NIFI_VERSION}/nifi-${NIFI_VERSION}-bin.zip}
--- End diff --
Did you forget to add `/opt` here to this? `PATH:-/nifi/${NIFI_VERSION}`?
From the diff, it doesn't look like `/nifi` would be a valid starting path.
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