compose

compose/production/mattermost/db/Dockerfile

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+FROM postgres:9.4-alpine
+
+ENV DEFAULT_TIMEZONE UTC
+
+# Install some packages to use WAL
+RUN echo "azure<5.0.0" > pip-constraints.txt
+RUN apk add --no-cache \
+      build-base \
+      curl \
+      libc6-compat \
+      libffi-dev \
+      linux-headers \
+      python-dev \
+      py-pip \
+      py-cryptography \
+      pv \
+      libressl-dev \
+    && pip install --upgrade pip \
+    && pip --no-cache-dir install -c pip-constraints.txt 'wal-e<1.0.0' envdir \
+    && rm -rf /var/cache/apk/* /tmp/* /var/tmp/*
+
+# Add wale script
+COPY setup-wale.sh /docker-entrypoint-initdb.d/
+
+#Healthcheck to make sure container is ready
+HEALTHCHECK CMD pg_isready -U $POSTGRES_USER -d $POSTGRES_DB || exit 1
+
+# Add and configure entrypoint and command
+COPY entrypoint.sh /
+ENTRYPOINT ["/entrypoint.sh"]
+CMD ["postgres"]
+
+VOLUME ["/var/run/postgresql", "/usr/share/postgresql/", "/var/lib/postgresql/data", "/tmp", "/etc/wal-e.d/env"]

compose/production/mattermost/db/entrypoint.sh

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+#!/bin/bash
+
+# if wal-e backup is not enabled, use minimal wal-e logging to reduce disk space
+export WAL_LEVEL=${WAL_LEVEL:-minimal}
+export ARCHIVE_MODE=${ARCHIVE_MODE:-off}
+export ARCHIVE_TIMEOUT=${ARCHIVE_TIMEOUT:-60}
+
+function update_conf () {
+  wal=$1
+  # PGDATA is defined in upstream postgres dockerfile
+  config_file=$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
+  set -- postgres "$@"
+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 "$v is required for Wal-E but not set. Skipping Wal-E setup."
+      wal_enable=false
+    fi
+  done
+
+  # Setup wal-e env variables
+  if [ "$wal_enable" = true ] ; then
+    for v in ${VARS[@]}; do
+      export $v="${!v}"
+    done
+    WAL_LEVEL=archive
+    ARCHIVE_MODE=on
+  fi
+
+  # Update postgresql configuration
+  update_conf $wal_enable
+
+  # Run the postgresql entrypoint
+  docker-entrypoint.sh postgres
+fi

compose/production/mattermost/db/setup-wale.sh

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+#!/bin/bash
+
+# wal-e specific configuration
+echo "wal_level = $WAL_LEVEL" >> $PGDATA/postgresql.conf
+echo "archive_mode = $ARCHIVE_MODE" >> $PGDATA/postgresql.conf
+echo "archive_command = '/usr/bin/wal-e wal-push %p'" >> $PGDATA/postgresql.conf
+echo "archive_timeout = $ARCHIVE_TIMEOUT" >> $PGDATA/postgresql.conf