added documentation

Author: janvda

influxdb/Dockerfile

@@ -1,11 +1,11 @@
 FROM arm32v7/influxdb:latest
 
-# The following instruction defines the mount location where the influxdb data should be stored.
-# In this case it is referring to an USB memory stick with label "influxdb" that is formatted in "ext4" format.
-# If there is no such USB drive connected to the device then the named volume specified in the
-# docker compose will be used.
+# If the following instruction refers to an existing USB drive (e.g. memory stick) connected to the device
+# then it will use that drive for storing in the influxdb otherwise it will use the named volume
+# that is specified in the docker compose yaml file.
 #
-RUN echo "LABEL=influxdb2 /mnt/influxdb ext4 rw,relatime,discard,data=ordered 0 2"  >> /etc/fstab
+# So the instruction below refers to a connected USB drive with label "influxdb" which should be in "ext4" format.
+RUN echo "LABEL=influxdb /mnt/influxdb ext4 rw,relatime,discard,data=ordered 0 2"  >> /etc/fstab
 
 # The script "my_entrypoint.sh" is an extension of the existing script with extra instructions to mount the usb memory stick.
 COPY my_entrypoint.sh /entrypoint.sh