init

Dockerfile

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+FROM postgres:9.6
+
+COPY ./backup/pg_backup.config /etc/pg_backup.config
+
+COPY ./backup/pg_backup_rotated.sh /usr/local/bin/pg_backup_rotated.sh
+
+COPY ./backup/pg_backup_rotated.cron.sh /etc/cron.daily/pg_backup_rotated.cron.sh
+
+COPY ./run.sh /run.sh
+
+VOLUME "/var/lib/postgresql/backup"
+
+ENTRYPOINT ["/run.sh"]
+
+CMD ["postgres"]

backup/pg_backup.config

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+##############################
+## POSTGRESQL BACKUP CONFIG ##
+##############################
+ 
+# Optional system user to run backups as.  If the user the script is running as doesn't match this
+# the script terminates.  Leave blank to skip check.
+BACKUP_USER=
+ 
+# Optional hostname to adhere to pg_hba policies.  Will default to "localhost" if none specified.
+HOSTNAME=
+ 
+# Optional username to connect to database as.  Will default to "postgres" if none specified.
+USERNAME=
+ 
+# This dir will be created if it doesn't exist.  This must be writable by the user the script is
+# running as.
+BACKUP_DIR=/var/lib/postgresql/backup/
+ 
+# List of strings to match against in database name, separated by space or comma, for which we only
+# wish to keep a backup of the schema, not the data. Any database names which contain any of these
+# values will be considered candidates. (e.g. "system_log" will match "dev_system_log_2010-01")
+SCHEMA_ONLY_LIST=""
+ 
+# Will produce a custom-format backup if set to "yes"
+ENABLE_CUSTOM_BACKUPS=yes
+ 
+# Will produce a gzipped plain-format backup if set to "yes"
+ENABLE_PLAIN_BACKUPS=yes
+ 
+# Will produce gzipped sql file containing the cluster globals, like users and passwords, if set to "yes"
+ENABLE_GLOBALS_BACKUPS=yes
+ 
+ 
+#### SETTINGS FOR ROTATED BACKUPS ####
+ 
+# Which day to take the weekly backup from (1-7 = Monday-Sunday)
+DAY_OF_WEEK_TO_KEEP=1-7
+ 
+# Number of days to keep daily backups
+DAYS_TO_KEEP=7
+ 
+# How many weeks to keep weekly backups
+WEEKS_TO_KEEP=10
+ 
+######################################

backup/pg_backup_rotated.cron.sh

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+#! /usr/bin/env bash
+
+pg_backup_rotated.sh -c /etc/pg_backup.config

backup/pg_backup_rotated.sh

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+#!/bin/bash
+ 
+###########################
+####### LOAD CONFIG #######
+###########################
+ 
+while [ $# -gt 0 ]; do
+        case $1 in
+                -c)
+                        CONFIG_FILE_PATH="$2"
+                        shift 2
+                        ;;
+                *)
+                        ${ECHO} "Unknown Option \"$1\"" 1>&2
+                        exit 2
+                        ;;
+        esac
+done
+ 
+if [ -z $CONFIG_FILE_PATH ] ; then
+        SCRIPTPATH=$(cd ${0%/*} && pwd -P)
+        CONFIG_FILE_PATH="${SCRIPTPATH}/pg_backup.config"
+fi
+ 
+if [ ! -r ${CONFIG_FILE_PATH} ] ; then
+        echo "Could not load config file from ${CONFIG_FILE_PATH}" 1>&2
+        exit 1
+fi
+ 
+source "${CONFIG_FILE_PATH}"
+ 
+###########################
+#### PRE-BACKUP CHECKS ####
+###########################
+ 
+# Make sure we're running as the required backup user
+if [ "$BACKUP_USER" != "" -a "$(id -un)" != "$BACKUP_USER" ] ; then
+  echo "This script must be run as $BACKUP_USER. Exiting." 1>&2
+  exit 1
+fi
+ 
+ 
+###########################
+### INITIALISE DEFAULTS ###
+###########################
+ 
+if [ ! $HOSTNAME ]; then
+  HOSTNAME="localhost"
+fi;
+ 
+if [ ! $USERNAME ]; then
+  USERNAME="postgres"
+fi;
+ 
+ 
+###########################
+#### START THE BACKUPS ####
+###########################
+ 
+function perform_backups()
+{
+  SUFFIX=$1
+  FINAL_BACKUP_DIR=$BACKUP_DIR"`date +\%Y-\%m-\%d`$SUFFIX/"
+ 
+  echo "Making backup directory in $FINAL_BACKUP_DIR"
+ 
+  if ! mkdir -p $FINAL_BACKUP_DIR; then
+    echo "Cannot create backup directory in $FINAL_BACKUP_DIR. Go and fix it!" 1>&2
+    exit 1;
+  fi;
+ 
+  #######################
+  ### GLOBALS BACKUPS ###
+  #######################
+ 
+  echo -e "\n\nPerforming globals backup"
+  echo -e "--------------------------------------------\n"
+ 
+  if [ $ENABLE_GLOBALS_BACKUPS = "yes" ]
+  then
+        echo "Globals backup"
+ 
+        if ! pg_dumpall -g -h "$HOSTNAME" -U "$USERNAME" | gzip > $FINAL_BACKUP_DIR"globals".sql.gz.in_progress; then
+                echo "[!!ERROR!!] Failed to produce globals backup" 1>&2
+        else
+                mv $FINAL_BACKUP_DIR"globals".sql.gz.in_progress $FINAL_BACKUP_DIR"globals".sql.gz
+        fi
+  else
+    echo "None"
+  fi
+ 
+ 
+  ###########################
+  ### SCHEMA-ONLY BACKUPS ###
+  ###########################
+ 
+  for SCHEMA_ONLY_DB in ${SCHEMA_ONLY_LIST//,/ }
+  do
+          SCHEMA_ONLY_CLAUSE="$SCHEMA_ONLY_CLAUSE or datname ~ '$SCHEMA_ONLY_DB'"
+  done
+ 
+  SCHEMA_ONLY_QUERY="select datname from pg_database where false $SCHEMA_ONLY_CLAUSE order by datname;"
+ 
+  echo -e "\n\nPerforming schema-only backups"
+  echo -e "--------------------------------------------\n"
+ 
+  SCHEMA_ONLY_DB_LIST=`psql -h "$HOSTNAME" -U "$USERNAME" -At -c "$SCHEMA_ONLY_QUERY" postgres`
+ 
+  echo -e "The following databases were matched for schema-only backup:\n${SCHEMA_ONLY_DB_LIST}\n"
+ 
+  for DATABASE in $SCHEMA_ONLY_DB_LIST
+  do
+          echo "Schema-only backup of $DATABASE"
+ 
+          if ! pg_dump -Fp -s -h "$HOSTNAME" -U "$USERNAME" "$DATABASE" | gzip > $FINAL_BACKUP_DIR"$DATABASE"_SCHEMA.sql.gz.in_progress; then
+                  echo "[!!ERROR!!] Failed to backup database schema of $DATABASE" 1>&2
+          else
+                  mv $FINAL_BACKUP_DIR"$DATABASE"_SCHEMA.sql.gz.in_progress $FINAL_BACKUP_DIR"$DATABASE"_SCHEMA.sql.gz
+          fi
+  done
+ 
+ 
+  ###########################
+  ###### FULL BACKUPS #######
+  ###########################
+ 
+  for SCHEMA_ONLY_DB in ${SCHEMA_ONLY_LIST//,/ }
+  do
+    EXCLUDE_SCHEMA_ONLY_CLAUSE="$EXCLUDE_SCHEMA_ONLY_CLAUSE and datname !~ '$SCHEMA_ONLY_DB'"
+  done
+ 
+  FULL_BACKUP_QUERY="select datname from pg_database where not datistemplate and datallowconn $EXCLUDE_SCHEMA_ONLY_CLAUSE order by datname;"
+ 
+  echo -e "\n\nPerforming full backups"
+  echo -e "--------------------------------------------\n"
+ 
+  for DATABASE in `psql -h "$HOSTNAME" -U "$USERNAME" -At -c "$FULL_BACKUP_QUERY" postgres`
+  do
+    if [ $ENABLE_PLAIN_BACKUPS = "yes" ]
+    then
+      echo "Plain backup of $DATABASE"
+ 
+      if ! pg_dump -Fp -h "$HOSTNAME" -U "$USERNAME" "$DATABASE" | gzip > $FINAL_BACKUP_DIR"$DATABASE".sql.gz.in_progress; then
+        echo "[!!ERROR!!] Failed to produce plain backup database $DATABASE" 1>&2
+      else
+        mv $FINAL_BACKUP_DIR"$DATABASE".sql.gz.in_progress $FINAL_BACKUP_DIR"$DATABASE".sql.gz
+      fi
+    fi
+ 
+    if [ $ENABLE_CUSTOM_BACKUPS = "yes" ]
+    then
+      echo "Custom backup of $DATABASE"
+ 
+      if ! pg_dump -Fc -h "$HOSTNAME" -U "$USERNAME" "$DATABASE" -f $FINAL_BACKUP_DIR"$DATABASE".custom.in_progress; then
+        echo "[!!ERROR!!] Failed to produce custom backup database $DATABASE"
+      else
+        mv $FINAL_BACKUP_DIR"$DATABASE".custom.in_progress $FINAL_BACKUP_DIR"$DATABASE".custom
+      fi
+    fi
+ 
+  done
+ 
+  date > $FINAL_BACKUP_DIR/complete
+  echo -e "\nAll database backups complete!"
+}
+ 
+# MONTHLY BACKUPS
+ 
+DAY_OF_MONTH=`date +%d`
+ 
+if [ $DAY_OF_MONTH -eq 1 ];
+then
+  # Delete all expired monthly directories
+  find $BACKUP_DIR -maxdepth 1 -name "*-monthly" -exec rm -rf '{}' ';'
+ 
+  perform_backups "-monthly"
+ 
+  exit 0;
+fi
+ 
+# WEEKLY BACKUPS
+ 
+DAY_OF_WEEK=`date +%u` #1-7 (Monday-Sunday)
+EXPIRED_DAYS=`expr $((($WEEKS_TO_KEEP * 7) + 1))`
+ 
+if [ $DAY_OF_WEEK = $DAY_OF_WEEK_TO_KEEP ];
+then
+  # Delete all expired weekly directories
+  find $BACKUP_DIR -maxdepth 1 -mtime +$EXPIRED_DAYS -name "*-weekly" -exec rm -rf '{}' ';'
+ 
+  perform_backups "-weekly"
+ 
+  exit 0;
+fi
+ 
+# DAILY BACKUPS
+ 
+# Delete daily backups 7 days old or more
+find $BACKUP_DIR -maxdepth 1 -mtime +$DAYS_TO_KEEP -name "*-daily" -exec rm -rf '{}' ';'
+ 
+perform_backups "-daily"
+

run.sh

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+#! /usr/bin/env bash
+
+cron -f &
+
+/docker-entrypoint.sh $*