added slave backend

docker-compose.yml

@@ -52,6 +52,23 @@ services:
         env_file:
             - env
 
+    postgresql-slave1:
+        build: ./postgresql-slave
+        container_name: pdns-postgresql-slave1
+        networks:
+            pdns.internal.docker:
+                aliases:
+                    - postgresql-slave1.pdns.internal.docker
+        volumes:
+            - ./data/postgresql-slave1/data:/var/lib/postgresql/data
+            - ./data/postgresql-slave1/backup:/var/lib/postgresql/backup
+        ports:
+            - "127.0.0.1:34023:5432"
+        env_file:
+            - env
+        environment:
+            - POSTGRES_SLAVE_INDEX=1
+
 
 networks:
     pdns.internal.docker:

env

@@ -18,3 +18,13 @@ DNS_HOSTMASTER=hostmaster.rthoni.com
 DNS_NS1=ns1.rthoni.com
 DNS_NS2=ns2.rthoni.com
 DNS_TTL=600
+
+POSTGRES_SLAVE_ENABLED_1=0
+POSTGRES_SLAVE_REP_HOST_1=master.example.com
+POSTGRES_SLAVE_REP_USER_1=replicator
+POSTGRES_SLAVE_REP_PASSWORD_1=pg_password
+POSTGRES_SLAVE_REP_PORT_1=34020
+POSTGRES_SLAVE_HOST_1=postgresql-slave1.pdns.internal.docker
+POSTGRES_SLAVE_USER_1=poweradmin
+POSTGRES_SLAVE_PASSWORD_1=pg_password
+POSTGRES_SLAVE_DB_1=poweradmin

pdns-recursor/vars-vars

@@ -18,3 +18,12 @@ DNS_HOSTMASTER
 DNS_NS1
 DNS_NS2
 DNS_TTL
+
+POSTGRES_SLAVE_ENABLED_1
+POSTGRES_SLAVE_MASTER_1
+POSTGRES_SLAVE_REP_USER_1
+POSTGRES_SLAVE_REP_PASSWORD_1
+POSTGRES_SLAVE_PORT_1
+POSTGRES_SLAVE_USER_1
+POSTGRES_SLAVE_PASSWORD_1
+POSTGRES_SLAVE_DB_1

pdns/config/pdns.conf

@@ -243,7 +243,7 @@ guardian=yes
 #################################
 # launch  Which backends to launch and order to query them in
 #
-# launch=
+launch=
 
 #################################
 # load-modules  Load this module - supply absolute or relative path
@@ -579,18 +579,17 @@ webserver-print-arguments=yes
 # PostgreSQL Configuration
 #
 # Launch gpgsql backend
-launch=gpgsql
-
+launch+=gpgsql:main
 # gpgsql parameters
-gpgsql-host=POSTGRES_HOST
-gpgsql-port=
-gpgsql-dbname=POSTGRES_DB
-gpgsql-user=POSTGRES_USER
-gpgsql-password=POSTGRES_PASSWORD
-gpgsql-dnssec=yes
-
-
-#loglevel=9
-#log-dns-details=yes
-#log-dns-queries=yes
-#query-logging=yes
+gpgsql-main-host=POSTGRES_HOST
+gpgsql-main-port=
+gpgsql-main-dbname=POSTGRES_DB
+gpgsql-main-user=POSTGRES_USER
+gpgsql-main-password=POSTGRES_PASSWORD
+gpgsql-main-dnssec=yes
+
+
+loglevel=9
+log-dns-details=yes
+log-dns-queries=yes
+query-logging=yes

pdns/run.sh

@@ -8,4 +8,27 @@ export PDNS_RECURSOR_HOST="$(getent hosts ${PDNS_RECURSOR_HOST} | cut -d' ' -f1)
 
 replace_files
 
+for index in {0..1}
+do
+  var_name=POSTGRES_SLAVE_ENABLED_"${index}"
+
+  if [ "${!var_name}" == 1 ]
+  then
+    echo "Found slave ${index}"
+    pg_host=POSTGRES_SLAVE_HOST_"${index}"
+    pg_db=POSTGRES_SLAVE_DB_"${index}"
+    pg_user=POSTGRES_SLAVE_USER_"${index}"
+    pg_pwd=POSTGRES_SLAVE_PASSWORD_"${index}"
+    cat << EOF >> /etc/powerdns/pdns.conf
+launch+=gpgsql:slave${index}
+gpgsql-slave${index}-host=${!pg_host}
+gpgsql-slave${index}-port=
+gpgsql-slave${index}-dbname=${!pg_db}
+gpgsql-slave${index}-user=${!pg_user}
+gpgsql-slave${index}-password=${!pg_pwd}
+gpgsql-slave${index}-dnssec=yes
+EOF
+  fi
+done
+
 pdns_server --daemon=no

pdns/vars-vars

@@ -18,3 +18,12 @@ DNS_HOSTMASTER
 DNS_NS1
 DNS_NS2
 DNS_TTL
+
+POSTGRES_SLAVE_ENABLED_1
+POSTGRES_SLAVE_MASTER_1
+POSTGRES_SLAVE_REP_USER_1
+POSTGRES_SLAVE_REP_PASSWORD_1
+POSTGRES_SLAVE_PORT_1
+POSTGRES_SLAVE_USER_1
+POSTGRES_SLAVE_PASSWORD_1
+POSTGRES_SLAVE_DB_1

postgresql-slave/Dockerfile

@@ -0,0 +1,23 @@
+FROM robinthoni/postgres-backup-multiarch:9.6
+
+ARG CONFIG_DIR=/etc/default/config-files/
+
+RUN rm -rf /var/log/*
+
+COPY ./vars-vars /etc/vars-vars
+
+COPY ./vars-files /etc/vars-files
+
+COPY ./common.sh /common.sh
+
+COPY ./run.sh /run.sh
+
+RUN mkdir "${CONFIG_DIR}"
+
+COPY ./config/postgresql.conf "${CONFIG_DIR}"/postgresql.conf
+
+COPY ./config/recovery.conf "${CONFIG_DIR}"/recovery.conf
+
+ENTRYPOINT ["/bin/sh", "-c"]
+
+CMD ["/run.sh"]

postgresql-slave/common.sh

@@ -0,0 +1,41 @@
+export CONFIG_DIR="/etc/default/config-files/"
+
+resolv_host()
+{
+  hostname="${1}"
+  ip=$(getent hosts "${hostname}" | cut -d' ' -f1)
+  echo "${ip}"
+}
+
+replace_var()
+{
+  file="${1}"
+  var="${2}"
+  sed -e "s?${var}?${!var}?g" -i "${file}"
+}
+
+replace_vars()
+{
+  file="${1}"
+  for var in $(cat /etc/vars-vars)
+  do
+    replace_var "${file}" "${var}"
+  done
+}
+
+replace_files()
+{
+  cat /etc/vars-files | while read line
+  do
+    filesrc="${CONFIG_DIR}$(echo "${line}" | awk '{print $1}')"
+    filedst=$(echo "${line}" | awk '{print $2}')
+    if [ -f "${filesrc}" ]
+    then
+      echo "Expanding file ${filesrc} to ${filedst}"
+      cp "${filesrc}" "${filedst}"
+      replace_vars "${filedst}"
+    else
+      echo "File ${filesrc} does not exist. Skipping."
+    fi
+  done
+}

postgresql-slave/config/postgresql.conf

@@ -0,0 +1,641 @@
+# -----------------------------
+# PostgreSQL configuration file
+# -----------------------------
+#
+# This file consists of lines of the form:
+#
+#   name = value
+#
+# (The "=" is optional.)  Whitespace may be used.  Comments are introduced with
+# "#" anywhere on a line.  The complete list of parameter names and allowed
+# values can be found in the PostgreSQL documentation.
+#
+# The commented-out settings shown in this file represent the default values.
+# Re-commenting a setting is NOT sufficient to revert it to the default value;
+# you need to reload the server.
+#
+# This file is read on server startup and when the server receives a SIGHUP
+# signal.  If you edit the file on a running system, you have to SIGHUP the
+# server for the changes to take effect, or use "pg_ctl reload".  Some
+# parameters, which are marked below, require a server shutdown and restart to
+# take effect.
+#
+# Any parameter can also be given as a command-line option to the server, e.g.,
+# "postgres -c log_connections=on".  Some parameters can be changed at run time
+# with the "SET" SQL command.
+#
+# Memory units:  kB = kilobytes        Time units:  ms  = milliseconds
+#                MB = megabytes                     s   = seconds
+#                GB = gigabytes                     min = minutes
+#                TB = terabytes                     h   = hours
+#                                                   d   = days
+
+
+#------------------------------------------------------------------------------
+# FILE LOCATIONS
+#------------------------------------------------------------------------------
+
+# The default values of these variables are driven from the -D command-line
+# option or PGDATA environment variable, represented here as ConfigDir.
+
+#data_directory = 'ConfigDir'		# use data in another directory
+					# (change requires restart)
+#hba_file = 'ConfigDir/pg_hba.conf'	# host-based authentication file
+					# (change requires restart)
+#ident_file = 'ConfigDir/pg_ident.conf'	# ident configuration file
+					# (change requires restart)
+
+# If external_pid_file is not explicitly set, no extra PID file is written.
+#external_pid_file = ''			# write an extra PID file
+					# (change requires restart)
+
+
+#------------------------------------------------------------------------------
+# CONNECTIONS AND AUTHENTICATION
+#------------------------------------------------------------------------------
+
+# - Connection Settings -
+
+listen_addresses = '*'
+					# comma-separated list of addresses;
+					# defaults to 'localhost'; use '*' for all
+					# (change requires restart)
+#port = 5432				# (change requires restart)
+max_connections = 100			# (change requires restart)
+#superuser_reserved_connections = 3	# (change requires restart)
+#unix_socket_directories = '/var/run/postgresql'	# comma-separated list of directories
+					# (change requires restart)
+#unix_socket_group = ''			# (change requires restart)
+#unix_socket_permissions = 0777		# begin with 0 to use octal notation
+					# (change requires restart)
+#bonjour = off				# advertise server via Bonjour
+					# (change requires restart)
+#bonjour_name = ''			# defaults to the computer name
+					# (change requires restart)
+
+# - Security and Authentication -
+
+#authentication_timeout = 1min		# 1s-600s
+#ssl = off				# (change requires restart)
+#ssl_ciphers = 'HIGH:MEDIUM:+3DES:!aNULL' # allowed SSL ciphers
+					# (change requires restart)
+#ssl_prefer_server_ciphers = on		# (change requires restart)
+#ssl_ecdh_curve = 'prime256v1'		# (change requires restart)
+#ssl_cert_file = 'server.crt'		# (change requires restart)
+#ssl_key_file = 'server.key'		# (change requires restart)
+#ssl_ca_file = ''			# (change requires restart)
+#ssl_crl_file = ''			# (change requires restart)
+#password_encryption = on
+#db_user_namespace = off
+#row_security = on
+
+# GSSAPI using Kerberos
+#krb_server_keyfile = ''
+#krb_caseins_users = off
+
+# - TCP Keepalives -
+# see "man 7 tcp" for details
+
+#tcp_keepalives_idle = 0		# TCP_KEEPIDLE, in seconds;
+					# 0 selects the system default
+#tcp_keepalives_interval = 0		# TCP_KEEPINTVL, in seconds;
+					# 0 selects the system default
+#tcp_keepalives_count = 0		# TCP_KEEPCNT;
+					# 0 selects the system default
+
+
+#------------------------------------------------------------------------------
+# RESOURCE USAGE (except WAL)
+#------------------------------------------------------------------------------
+
+# - Memory -
+
+shared_buffers = 128MB			# min 128kB
+					# (change requires restart)
+#huge_pages = try			# on, off, or try
+					# (change requires restart)
+#temp_buffers = 8MB			# min 800kB
+#max_prepared_transactions = 0		# zero disables the feature
+					# (change requires restart)
+# Caution: it is not advisable to set max_prepared_transactions nonzero unless
+# you actively intend to use prepared transactions.
+#work_mem = 4MB				# min 64kB
+#maintenance_work_mem = 64MB		# min 1MB
+#replacement_sort_tuples = 150000	# limits use of replacement selection sort
+#autovacuum_work_mem = -1		# min 1MB, or -1 to use maintenance_work_mem
+#max_stack_depth = 2MB			# min 100kB
+dynamic_shared_memory_type = posix	# the default is the first option
+					# supported by the operating system:
+					#   posix
+					#   sysv
+					#   windows
+					#   mmap
+					# use none to disable dynamic shared memory
+
+# - Disk -
+
+#temp_file_limit = -1			# limits per-process temp file space
+					# in kB, or -1 for no limit
+
+# - Kernel Resource Usage -
+
+#max_files_per_process = 1000		# min 25
+					# (change requires restart)
+#shared_preload_libraries = ''		# (change requires restart)
+
+# - Cost-Based Vacuum Delay -
+
+#vacuum_cost_delay = 0			# 0-100 milliseconds
+#vacuum_cost_page_hit = 1		# 0-10000 credits
+#vacuum_cost_page_miss = 10		# 0-10000 credits
+#vacuum_cost_page_dirty = 20		# 0-10000 credits
+#vacuum_cost_limit = 200		# 1-10000 credits
+
+# - Background Writer -
+
+#bgwriter_delay = 200ms			# 10-10000ms between rounds
+#bgwriter_lru_maxpages = 100		# 0-1000 max buffers written/round
+#bgwriter_lru_multiplier = 2.0		# 0-10.0 multiplier on buffers scanned/round
+#bgwriter_flush_after = 512kB		# measured in pages, 0 disables
+
+# - Asynchronous Behavior -
+
+#effective_io_concurrency = 1		# 1-1000; 0 disables prefetching
+#max_worker_processes = 8		# (change requires restart)
+#max_parallel_workers_per_gather = 0	# taken from max_worker_processes
+#old_snapshot_threshold = -1		# 1min-60d; -1 disables; 0 is immediate
+					# (change requires restart)
+#backend_flush_after = 0		# measured in pages, 0 disables
+
+
+#------------------------------------------------------------------------------
+# WRITE AHEAD LOG
+#------------------------------------------------------------------------------
+
+# - Settings -
+
+wal_level = replica			# minimal, replica, or logical
+					# (change requires restart)
+#fsync = on				# flush data to disk for crash safety
+						# (turning this off can cause
+						# unrecoverable data corruption)
+#synchronous_commit = on		# synchronization level;
+					# off, local, remote_write, remote_apply, or on
+#wal_sync_method = fsync		# the default is the first option
+					# supported by the operating system:
+					#   open_datasync
+					#   fdatasync (default on Linux)
+					#   fsync
+					#   fsync_writethrough
+					#   open_sync
+#full_page_writes = on			# recover from partial page writes
+#wal_compression = off			# enable compression of full-page writes
+#wal_log_hints = off			# also do full page writes of non-critical updates
+					# (change requires restart)
+#wal_buffers = -1			# min 32kB, -1 sets based on shared_buffers
+					# (change requires restart)
+#wal_writer_delay = 200ms		# 1-10000 milliseconds
+#wal_writer_flush_after = 1MB		# measured in pages, 0 disables
+
+#commit_delay = 0			# range 0-100000, in microseconds
+#commit_siblings = 5			# range 1-1000
+
+# - Checkpoints -
+
+#checkpoint_timeout = 5min		# range 30s-1d
+#max_wal_size = 1GB
+#min_wal_size = 80MB
+#checkpoint_completion_target = 0.5	# checkpoint target duration, 0.0 - 1.0
+#checkpoint_flush_after = 256kB		# measured in pages, 0 disables
+#checkpoint_warning = 30s		# 0 disables
+
+# - Archiving -
+
+#archive_mode = off		# enables archiving; off, on, or always
+				# (change requires restart)
+#archive_command = ''		# command to use to archive a logfile segment
+				# placeholders: %p = path of file to archive
+				#               %f = file name only
+				# e.g. 'test ! -f /mnt/server/archivedir/%f && cp %p /mnt/server/archivedir/%f'
+#archive_timeout = 0		# force a logfile segment switch after this
+				# number of seconds; 0 disables
+
+
+#------------------------------------------------------------------------------
+# REPLICATION
+#------------------------------------------------------------------------------
+
+# - Sending Server(s) -
+
+# Set these on the master and on any standby that will send replication data.
+
+max_wal_senders = 3		# max number of walsender processes
+				# (change requires restart)
+wal_keep_segments = 8		# in logfile segments, 16MB each; 0 disables
+#wal_sender_timeout = 60s	# in milliseconds; 0 disables
+
+#max_replication_slots = 0	# max number of replication slots
+				# (change requires restart)
+#track_commit_timestamp = off	# collect timestamp of transaction commit
+				# (change requires restart)
+
+# - Master Server -
+
+# These settings are ignored on a standby server.
+
+#synchronous_standby_names = ''	# standby servers that provide sync rep
+				# number of sync standbys and comma-separated list of application_name
+				# from standby(s); '*' = all
+#vacuum_defer_cleanup_age = 0	# number of xacts by which cleanup is delayed
+
+# - Standby Servers -
+
+# These settings are ignored on a master server.
+
+hot_standby = on			# "on" allows queries during recovery
+					# (change requires restart)
+#max_standby_archive_delay = 30s	# max delay before canceling queries
+					# when reading WAL from archive;
+					# -1 allows indefinite delay
+#max_standby_streaming_delay = 30s	# max delay before canceling queries
+					# when reading streaming WAL;
+					# -1 allows indefinite delay
+#wal_receiver_status_interval = 10s	# send replies at least this often
+					# 0 disables
+#hot_standby_feedback = off		# send info from standby to prevent
+					# query conflicts
+#wal_receiver_timeout = 60s		# time that receiver waits for
+					# communication from master
+					# in milliseconds; 0 disables
+#wal_retrieve_retry_interval = 5s	# time to wait before retrying to
+					# retrieve WAL after a failed attempt
+
+
+#------------------------------------------------------------------------------
+# QUERY TUNING
+#------------------------------------------------------------------------------
+
+# - Planner Method Configuration -
+
+#enable_bitmapscan = on
+#enable_hashagg = on
+#enable_hashjoin = on
+#enable_indexscan = on
+#enable_indexonlyscan = on
+#enable_material = on
+#enable_mergejoin = on
+#enable_nestloop = on
+#enable_seqscan = on
+#enable_sort = on
+#enable_tidscan = on
+
+# - Planner Cost Constants -
+
+#seq_page_cost = 1.0			# measured on an arbitrary scale
+#random_page_cost = 4.0			# same scale as above
+#cpu_tuple_cost = 0.01			# same scale as above
+#cpu_index_tuple_cost = 0.005		# same scale as above
+#cpu_operator_cost = 0.0025		# same scale as above
+#parallel_tuple_cost = 0.1		# same scale as above
+#parallel_setup_cost = 1000.0	# same scale as above
+#min_parallel_relation_size = 8MB
+#effective_cache_size = 4GB
+
+# - Genetic Query Optimizer -
+
+#geqo = on
+#geqo_threshold = 12
+#geqo_effort = 5			# range 1-10
+#geqo_pool_size = 0			# selects default based on effort
+#geqo_generations = 0			# selects default based on effort
+#geqo_selection_bias = 2.0		# range 1.5-2.0
+#geqo_seed = 0.0			# range 0.0-1.0
+
+# - Other Planner Options -
+
+#default_statistics_target = 100	# range 1-10000
+#constraint_exclusion = partition	# on, off, or partition
+#cursor_tuple_fraction = 0.1		# range 0.0-1.0
+#from_collapse_limit = 8
+#join_collapse_limit = 8		# 1 disables collapsing of explicit
+					# JOIN clauses
+#force_parallel_mode = off
+
+
+#------------------------------------------------------------------------------
+# ERROR REPORTING AND LOGGING
+#------------------------------------------------------------------------------
+
+# - Where to Log -
+
+#log_destination = 'stderr'		# Valid values are combinations of
+					# stderr, csvlog, syslog, and eventlog,
+					# depending on platform.  csvlog
+					# requires logging_collector to be on.
+
+# This is used when logging to stderr:
+#logging_collector = off		# Enable capturing of stderr and csvlog
+					# into log files. Required to be on for
+					# csvlogs.
+					# (change requires restart)
+
+# These are only used if logging_collector is on:
+#log_directory = 'pg_log'		# directory where log files are written,
+					# can be absolute or relative to PGDATA
+#log_filename = 'postgresql-%Y-%m-%d_%H%M%S.log'	# log file name pattern,
+					# can include strftime() escapes
+#log_file_mode = 0600			# creation mode for log files,
+					# begin with 0 to use octal notation
+#log_truncate_on_rotation = off		# If on, an existing log file with the
+					# same name as the new log file will be
+					# truncated rather than appended to.
+					# But such truncation only occurs on
+					# time-driven rotation, not on restarts
+					# or size-driven rotation.  Default is
+					# off, meaning append to existing files
+					# in all cases.
+#log_rotation_age = 1d			# Automatic rotation of logfiles will
+					# happen after that time.  0 disables.
+#log_rotation_size = 10MB		# Automatic rotation of logfiles will
+					# happen after that much log output.
+					# 0 disables.
+
+# These are relevant when logging to syslog:
+#syslog_facility = 'LOCAL0'
+#syslog_ident = 'postgres'
+#syslog_sequence_numbers = on
+#syslog_split_messages = on
+
+# This is only relevant when logging to eventlog (win32):
+#event_source = 'PostgreSQL'
+
+# - When to Log -
+
+#client_min_messages = notice		# values in order of decreasing detail:
+					#   debug5
+					#   debug4
+					#   debug3
+					#   debug2
+					#   debug1
+					#   log
+					#   notice
+					#   warning
+					#   error
+
+#log_min_messages = warning		# values in order of decreasing detail:
+					#   debug5
+					#   debug4
+					#   debug3
+					#   debug2
+					#   debug1
+					#   info
+					#   notice
+					#   warning
+					#   error
+					#   log
+					#   fatal
+					#   panic
+
+#log_min_error_statement = error	# values in order of decreasing detail:
+					#   debug5
+					#   debug4
+					#   debug3
+					#   debug2
+					#   debug1
+					#   info
+					#   notice
+					#   warning
+					#   error
+					#   log
+					#   fatal
+					#   panic (effectively off)
+
+#log_min_duration_statement = -1	# -1 is disabled, 0 logs all statements
+					# and their durations, > 0 logs only
+					# statements running at least this number
+					# of milliseconds
+
+
+# - What to Log -
+
+#debug_print_parse = off
+#debug_print_rewritten = off
+#debug_print_plan = off
+#debug_pretty_print = on
+#log_checkpoints = off
+#log_connections = off
+#log_disconnections = off
+#log_duration = off
+#log_error_verbosity = default		# terse, default, or verbose messages
+#log_hostname = off
+#log_line_prefix = ''			# special values:
+					#   %a = application name
+					#   %u = user name
+					#   %d = database name
+					#   %r = remote host and port
+					#   %h = remote host
+					#   %p = process ID
+					#   %t = timestamp without milliseconds
+					#   %m = timestamp with milliseconds
+					#   %n = timestamp with milliseconds (as a Unix epoch)
+					#   %i = command tag
+					#   %e = SQL state
+					#   %c = session ID
+					#   %l = session line number
+					#   %s = session start timestamp
+					#   %v = virtual transaction ID
+					#   %x = transaction ID (0 if none)
+					#   %q = stop here in non-session
+					#        processes
+					#   %% = '%'
+					# e.g. '<%u%%%d> '
+#log_lock_waits = off			# log lock waits >= deadlock_timeout
+#log_statement = 'none'			# none, ddl, mod, all
+#log_replication_commands = off
+#log_temp_files = -1			# log temporary files equal or larger
+					# than the specified size in kilobytes;
+					# -1 disables, 0 logs all temp files
+log_timezone = 'UTC'
+
+
+# - Process Title -
+
+#cluster_name = ''			# added to process titles if nonempty
+					# (change requires restart)
+#update_process_title = on
+
+
+#------------------------------------------------------------------------------
+# RUNTIME STATISTICS
+#------------------------------------------------------------------------------
+
+# - Query/Index Statistics Collector -
+
+#track_activities = on
+#track_counts = on
+#track_io_timing = off
+#track_functions = none			# none, pl, all
+#track_activity_query_size = 1024	# (change requires restart)
+#stats_temp_directory = 'pg_stat_tmp'
+
+
+# - Statistics Monitoring -
+
+#log_parser_stats = off
+#log_planner_stats = off
+#log_executor_stats = off
+#log_statement_stats = off
+
+
+#------------------------------------------------------------------------------
+# AUTOVACUUM PARAMETERS
+#------------------------------------------------------------------------------
+
+#autovacuum = on			# Enable autovacuum subprocess?  'on'
+					# requires track_counts to also be on.
+#log_autovacuum_min_duration = -1	# -1 disables, 0 logs all actions and
+					# their durations, > 0 logs only
+					# actions running at least this number
+					# of milliseconds.
+#autovacuum_max_workers = 3		# max number of autovacuum subprocesses
+					# (change requires restart)
+#autovacuum_naptime = 1min		# time between autovacuum runs
+#autovacuum_vacuum_threshold = 50	# min number of row updates before
+					# vacuum
+#autovacuum_analyze_threshold = 50	# min number of row updates before
+					# analyze
+#autovacuum_vacuum_scale_factor = 0.2	# fraction of table size before vacuum
+#autovacuum_analyze_scale_factor = 0.1	# fraction of table size before analyze
+#autovacuum_freeze_max_age = 200000000	# maximum XID age before forced vacuum
+					# (change requires restart)
+#autovacuum_multixact_freeze_max_age = 400000000	# maximum multixact age
+					# before forced vacuum
+					# (change requires restart)
+#autovacuum_vacuum_cost_delay = 20ms	# default vacuum cost delay for
+					# autovacuum, in milliseconds;
+					# -1 means use vacuum_cost_delay
+#autovacuum_vacuum_cost_limit = -1	# default vacuum cost limit for
+					# autovacuum, -1 means use
+					# vacuum_cost_limit
+
+
+#------------------------------------------------------------------------------
+# CLIENT CONNECTION DEFAULTS
+#------------------------------------------------------------------------------
+
+# - Statement Behavior -
+
+#search_path = '"$user", public'	# schema names
+#default_tablespace = ''		# a tablespace name, '' uses the default
+#temp_tablespaces = ''			# a list of tablespace names, '' uses
+					# only default tablespace
+#check_function_bodies = on
+#default_transaction_isolation = 'read committed'
+#default_transaction_read_only = off
+#default_transaction_deferrable = off
+#session_replication_role = 'origin'
+#statement_timeout = 0			# in milliseconds, 0 is disabled
+#lock_timeout = 0			# in milliseconds, 0 is disabled
+#idle_in_transaction_session_timeout = 0		# in milliseconds, 0 is disabled
+#vacuum_freeze_min_age = 50000000
+#vacuum_freeze_table_age = 150000000
+#vacuum_multixact_freeze_min_age = 5000000
+#vacuum_multixact_freeze_table_age = 150000000
+#bytea_output = 'hex'			# hex, escape
+#xmlbinary = 'base64'
+#xmloption = 'content'
+#gin_fuzzy_search_limit = 0
+#gin_pending_list_limit = 4MB
+
+# - Locale and Formatting -
+
+datestyle = 'iso, mdy'
+#intervalstyle = 'postgres'
+timezone = 'UTC'
+#timezone_abbreviations = 'Default'     # Select the set of available time zone
+					# abbreviations.  Currently, there are
+					#   Default
+					#   Australia (historical usage)
+					#   India
+					# You can create your own file in
+					# share/timezonesets/.
+#extra_float_digits = 0			# min -15, max 3
+#client_encoding = sql_ascii		# actually, defaults to database
+					# encoding
+
+# These settings are initialized by initdb, but they can be changed.
+lc_messages = 'en_US.utf8'			# locale for system error message
+					# strings
+lc_monetary = 'en_US.utf8'			# locale for monetary formatting
+lc_numeric = 'en_US.utf8'			# locale for number formatting
+lc_time = 'en_US.utf8'				# locale for time formatting
+
+# default configuration for text search
+default_text_search_config = 'pg_catalog.english'
+
+# - Other Defaults -
+
+#dynamic_library_path = '$libdir'
+#local_preload_libraries = ''
+#session_preload_libraries = ''
+
+
+#------------------------------------------------------------------------------
+# LOCK MANAGEMENT
+#------------------------------------------------------------------------------
+
+#deadlock_timeout = 1s
+#max_locks_per_transaction = 64		# min 10
+					# (change requires restart)
+#max_pred_locks_per_transaction = 64	# min 10
+					# (change requires restart)
+
+
+#------------------------------------------------------------------------------
+# VERSION/PLATFORM COMPATIBILITY
+#------------------------------------------------------------------------------
+
+# - Previous PostgreSQL Versions -
+
+#array_nulls = on
+#backslash_quote = safe_encoding	# on, off, or safe_encoding
+#default_with_oids = off
+#escape_string_warning = on
+#lo_compat_privileges = off
+#operator_precedence_warning = off
+#quote_all_identifiers = off
+#sql_inheritance = on
+#standard_conforming_strings = on
+#synchronize_seqscans = on
+
+# - Other Platforms and Clients -
+
+#transform_null_equals = off
+
+
+#------------------------------------------------------------------------------
+# ERROR HANDLING
+#------------------------------------------------------------------------------
+
+#exit_on_error = off			# terminate session on any error?
+#restart_after_crash = on		# reinitialize after backend crash?
+
+
+#------------------------------------------------------------------------------
+# CONFIG FILE INCLUDES
+#------------------------------------------------------------------------------
+
+# These options allow settings to be loaded from files other than the
+# default postgresql.conf.
+
+#include_dir = 'conf.d'			# include files ending in '.conf' from
+					# directory 'conf.d'
+#include_if_exists = 'exists.conf'	# include file only if it exists
+#include = 'special.conf'		# include file
+
+
+#------------------------------------------------------------------------------
+# CUSTOMIZED OPTIONS
+#------------------------------------------------------------------------------
+
+# Add settings for extensions here

postgresql-slave/config/recovery.conf

@@ -0,0 +1,3 @@
+standby_mode = 'on'
+primary_conninfo = 'host=POSTGRES_SLAVE_REP_HOST port=POSTGRES_SLAVE_REP_PORT user=POSTGRES_SLAVE_REP_USER password=POSTGRES_SLAVE_REP_PASSWORD'
+trigger_file = '/tmp/postgresql.trigger'

postgresql-slave/run.sh

@@ -0,0 +1,47 @@
+#! /usr/bin/env bash
+
+if [ "${POSTGRES_SLAVE_INDEX}" == "" ]
+then
+  echo "No POSTGRES_SLAVE_INDEX defined. Exiting."
+  exit 0
+fi
+
+set_var_value()
+{
+  var_name="${1}"_"${POSTGRES_SLAVE_INDEX}"
+  export "${1}"="${!var_name}"
+}
+
+set_var_value POSTGRES_SLAVE_ENABLED
+
+if [ "${POSTGRES_SLAVE_ENABLED}" -ne 1 ]
+then
+  echo "Slave is disabled. Exiting."
+  exit 0
+fi
+
+set_var_value POSTGRES_SLAVE_REP_HOST
+set_var_value POSTGRES_SLAVE_REP_USER
+set_var_value POSTGRES_SLAVE_REP_PASSWORD
+set_var_value POSTGRES_SLAVE_REP_PORT
+
+. /common.sh
+
+replace_files
+
+replace_var /var/lib/postgresql/data/recovery.conf POSTGRES_SLAVE_REP_HOST
+replace_var /var/lib/postgresql/data/recovery.conf POSTGRES_SLAVE_REP_USER
+replace_var /var/lib/postgresql/data/recovery.conf POSTGRES_SLAVE_REP_PASSWORD
+replace_var /var/lib/postgresql/data/recovery.conf POSTGRES_SLAVE_REP_PORT
+
+rm -rf /tmp/*
+
+mv /var/lib/postgresql/data/*.conf /tmp
+
+rm -rf /var/lib/postgresql/data/*
+
+PGPASSWORD="${POSTGRES_SLAVE_REP_PASSWORD}" pg_basebackup -h "${POSTGRES_SLAVE_REP_HOST}" -p "${POSTGRES_SLAVE_REP_PORT}" -D /var/lib/postgresql/data -U "${POSTGRES_SLAVE_REP_USER}" -v
+
+mv /tmp/*.conf /var/lib/postgresql/data/
+
+docker-entrypoint.sh postgres

postgresql-slave/vars-files

@@ -0,0 +1,2 @@
+postgresql.conf /var/lib/postgresql/data/postgresql.conf
+recovery.conf /var/lib/postgresql/data/recovery.conf

postgresql-slave/vars-vars

@@ -0,0 +1,29 @@
+POSTGRES_HOST
+POSTGRES_USER
+POSTGRES_PASSWORD
+POSTGRES_DB
+
+PDNS_RECURSOR_HOST
+PDNS_API_KEY
+PDNS_WEBSERVER_PASSWORD
+PDNS_ALLOW_AXFR_IPS
+PDNS_ALLOW_RECURSION
+PDNS_ALSO_NOTIFY
+PDNS_ALLOW_NOTIFY_FROM
+PDNS_ALLOW_DNSUPDATE_FROM
+
+SESSION_KEY
+
+DNS_HOSTMASTER
+DNS_NS1
+DNS_NS2
+DNS_TTL
+
+POSTGRES_SLAVE_ENABLED_1
+POSTGRES_SLAVE_MASTER_1
+POSTGRES_SLAVE_REP_USER_1
+POSTGRES_SLAVE_REP_PASSWORD_1
+POSTGRES_SLAVE_PORT_1
+POSTGRES_SLAVE_USER_1
+POSTGRES_SLAVE_PASSWORD_1
+POSTGRES_SLAVE_DB_1

poweradmin/vars-vars

@@ -18,3 +18,12 @@ DNS_HOSTMASTER
 DNS_NS1
 DNS_NS2
 DNS_TTL
+
+POSTGRES_SLAVE_ENABLED_1
+POSTGRES_SLAVE_MASTER_1
+POSTGRES_SLAVE_REP_USER_1
+POSTGRES_SLAVE_REP_PASSWORD_1
+POSTGRES_SLAVE_PORT_1
+POSTGRES_SLAVE_USER_1
+POSTGRES_SLAVE_PASSWORD_1
+POSTGRES_SLAVE_DB_1

update_vars.sh

@@ -1,7 +1,7 @@
 #! /usr/bin/env sh
 
 vars=$(cat env | cut -d= -f1)
-for docker in pdns pdns-recursor poweradmin
+for docker in pdns pdns-recursor poweradmin postgresql-slave
 do
   echo "${vars}" > "./${docker}/vars-vars"
 done