Use best practices for Dockerfiles (#180)

db/Dockerfile

@@ -1,18 +1,29 @@
 FROM postgres:9.4
 
+# Install some packages to use WAL
 RUN apt-get update \
-    && apt-get install -y python-dev libffi-dev libssl-dev lzop pv daemontools curl build-essential \
+    && apt-get install -y \
+      build-essential \
+      curl \
+      daemontools \
+      libffi-dev \
+      libssl-dev \
+      lzop \
+      pv \
+      python-dev \
     && curl --silent --show-error --retry 5 https://bootstrap.pypa.io/get-pip.py | python \
     && pip install 'wal-e<1.0.0' \
-    && apt-get remove -y build-essential python-dev \
+    && apt-get remove -y \
+      build-essential \
+      python-dev \
     && apt-get autoremove -y \
     && apt-get clean \
-    && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+    && rm -rf /var/lib/apt/lists/* /var/cache/apt/archives/*.deb /var/cache/apt/archives/partial/*.deb /var/cache/apt/*.bin /tmp/* /var/tmp/*
 
+# Add wale script
 COPY setup-wale.sh /docker-entrypoint-initdb.d/
-COPY docker-entrypoint1.sh /
-RUN chmod +x /docker-entrypoint1.sh
-
-ENTRYPOINT ["/docker-entrypoint1.sh"]
 
+# Add and configure entrypoint and command
+COPY entrypoint.sh /
+ENTRYPOINT ["/entrypoint.sh"]
 CMD ["postgres"]

db/entrypoint.sh

@@ -30,6 +30,7 @@ if [ "$1" = 'postgres'  ]; then
         if [ "${!v}" = "" ]; then
             echo "$v is required for Wal-E but not set. Skipping Wal-E setup."
             update_conf
+            # Run the postgresql entrypoint
             . /docker-entrypoint.sh
             exit
         fi
@@ -47,5 +48,6 @@ if [ "$1" = 'postgres'  ]; then
     ARCHIVE_MODE=on
 
     update_conf
+    # Run the postgresql entrypoint
     . /docker-entrypoint.sh
 fi

db/setup-wale.sh

@@ -5,7 +5,3 @@ echo "wal_level = $WAL_LEVEL" >> $PGDATA/postgresql.conf
 echo "archive_mode = $ARCHIVE_MODE" >> $PGDATA/postgresql.conf
 echo "archive_command = 'envdir /etc/wal-e.d/env /usr/local/bin/wal-e wal-push %p'" >> $PGDATA/postgresql.conf
 echo "archive_timeout = $ARCHIVE_TIMEOUT" >> $PGDATA/postgresql.conf
-
-# no cron in the image, use systemd timer on host instead
-#su - postgres -c "crontab -l | { cat; echo \"0 3 * * * /usr/bin/envdir /etc/wal-e.d/env /usr/local/bin/wal-e backup-push /var/lib/postgresql/data\"; } | crontab -"
-#su - postgres -c "crontab -l | { cat; echo \"0 4 * * * /usr/bin/envdir /etc/wal-e.d/env /usr/local/bin/wal-e delete --confirm retain 7\"; } | crontab -"