Images Postgres Alpine, optimization (#207)

db/Dockerfile

@@ -1,24 +1,19 @@
-FROM postgres:9.4
+FROM postgres:9.4-alpine
+
+ENV DEFAULT_TIMEZONE UTC
 
 # Install some packages to use WAL
-RUN apt-get update \
+RUN apk add --no-cache \
-    && apt-get install -y \
+      build-base \
-      build-essential \
       curl \
-      daemontools \
+      libc6-compat \
       libffi-dev \
-      libssl-dev \
+      linux-headers \
-      lzop \
-      pv \
       python-dev \
+      py-cryptography \
     && curl --silent --show-error --retry 5 https://bootstrap.pypa.io/get-pip.py | python \
-    && pip install 'wal-e<1.0.0' \
+    && pip --no-cache-dir install 'wal-e<1.0.0' envdir \
-    && apt-get remove -y \
+    && rm -rf /var/cache/apk/* /tmp/* /var/tmp/*
-      build-essential \
-      python-dev \
-    && apt-get autoremove -y \
-    && apt-get clean \
-    && 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/

db/entrypoint.sh

@@ -1,22 +1,33 @@
 #!/bin/bash
 
-# if wal backup is not enabled, use minimal wal logging to reduce disk space
+# if wal-e backup is not enabled, use minimal wal-e logging to reduce disk space
-: ${WAL_LEVEL:=minimal}
+export WAL_LEVEL=${WAL_LEVEL:-minimal}
-: ${ARCHIVE_MODE:=off}
+export ARCHIVE_MODE=${ARCHIVE_MODE:-off}
-: ${ARCHIVE_TIMEOUT:=60}
+export ARCHIVE_TIMEOUT=${ARCHIVE_TIMEOUT:-60}
-
-export WAL_LEVEL
-export ARCHIVE_MODE
-export ARCHIVE_TIMEOUT
-
-# PGDATA is defined in upstream postgres dockerfile
 
 function update_conf () {
-    if [ -f $PGDATA/postgresql.conf ]; then
+  wal=$1
-        sed -i "s/wal_level =.*$/wal_level = $WAL_LEVEL/g" $PGDATA/postgresql.conf
+  # PGDATA is defined in upstream postgres dockerfile
-        sed -i "s/archive_mode =.*$/archive_mode = $ARCHIVE_MODE/g" $PGDATA/postgresql.conf
+  config_file=$PGDATA/postgresql.conf
-        sed -i "s/archive_timeout =.*$/archive_timeout = $ARCHIVE_TIMEOUT/g" $PGDATA/postgresql.conf
+
+  # Check if configuration file exists. If not, it probably means that database is not initialized yet
+  if [ ! -f $config_file ]; then
+    return
   fi
+  # Reinitialize config
+  sed -i "s/log_timezone =.*$//g" $PGDATA/postgresql.conf
+  sed -i "s/timezone =.*$//g" $PGDATA/postgresql.conf
+  sed -i "s/wal_level =.*$//g" $config_file
+  sed -i "s/archive_mode =.*$//g" $config_file
+  sed -i "s/archive_timeout =.*$//g" $config_file
+  sed -i "s/archive_command =.*$//g" $config_file
+
+  # Configure wal-e
+  if [ "$wal" = true ] ; then
+    /docker-entrypoint-initdb.d/setup-wale.sh
+  fi
+  echo "log_timezone = $DEFAULT_TIMEZONE" >> $config_file
+  echo "timezone = $DEFAULT_TIMEZONE" >> $config_file
 }
 
 if [ "${1:0:1}" = '-' ]; then
@@ -24,30 +35,28 @@ if [ "${1:0:1}" = '-'  ]; then
 fi
 
 if [ "$1" = 'postgres' ]; then
+  # Check wal-e variables
+  wal_enable=true
   VARS=(AWS_ACCESS_KEY_ID AWS_SECRET_ACCESS_KEY WALE_S3_PREFIX AWS_REGION)
-
   for v in ${VARS[@]}; do
     if [ "${!v}" = "" ]; then
       echo "$v is required for Wal-E but not set. Skipping Wal-E setup."
-            update_conf
+      wal_enable=false
-            # Run the postgresql entrypoint
-            . /docker-entrypoint.sh
-            exit
     fi
   done
 
-    umask u=rwx,g=rx,o=
+  # Setup wal-e env variables
-    mkdir -p /etc/wal-e.d/env
+  if [ "$wal_enable" = true ] ; then
-
     for v in ${VARS[@]}; do
-        echo "${!v}" > /etc/wal-e.d/env/$v
+      export $v="${!v}"
     done
-    chown -R root:postgres /etc/wal-e.d
-
     WAL_LEVEL=archive
     ARCHIVE_MODE=on
+  fi
+
+  # Update postgresql configuration
+  update_conf $wal_enable
 
-    update_conf
   # Run the postgresql entrypoint
   . /docker-entrypoint.sh
 fi

db/setup-wale.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
-# wal-e specific
+# wal-e specific configuration
 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_command = '/usr/bin/wal-e wal-push %p'" >> $PGDATA/postgresql.conf
 echo "archive_timeout = $ARCHIVE_TIMEOUT" >> $PGDATA/postgresql.conf