enh

master_side/init-replication.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+set -e
+
+echo "Creating replication role..."
+
+psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" <<-EOSQL
+DO \$\$
+BEGIN
+   IF NOT EXISTS (
+      SELECT 1 FROM pg_roles WHERE rolname = 'replicator'
+   ) THEN
+      CREATE ROLE replicator
+        WITH REPLICATION
+        LOGIN
+        PASSWORD 'replicator_password';
+   END IF;
+END
+\$\$;
+EOSQL
+
+echo "Replication role ready."
+

master_side/pg_hba.conf

@@ -0,0 +1,17 @@
+# TYPE  DATABASE        USER            ADDRESS                 METHOD
+
+# Local connections
+local   all             all                                     trust
+
+# IPv4 local connections
+host    all             all             127.0.0.1/32            trust
+
+# IPv6 local connections
+host    all             all             ::1/128                 trust
+
+# Allow replication user from primary
+host    replication     replicator      0.0.0.0/0               md5
+
+host    mytestdb        postgres        0.0.0.0/0               md5
+
+

master_side/postgresql.conf

@@ -0,0 +1,35 @@
+# -----------------------------
+# BASIC
+# -----------------------------
+listen_addresses = '*'
+port = 5432
+max_connections = 100
+
+# -----------------------------
+# REPLICATION
+# -----------------------------
+wal_level = replica
+hot_standby = on
+max_wal_senders = 10
+max_replication_slots = 10
+wal_keep_size = 256MB
+
+# -----------------------------
+# REPLICA READ SAFETY
+# -----------------------------
+hot_standby_feedback = on
+
+# -----------------------------
+# LOGGING (optional but useful)
+# -----------------------------
+logging_collector = on
+log_destination = 'stderr'
+log_directory = 'log'
+log_filename = 'postgresql-%Y-%m-%d.log'
+log_statement = 'none'
+
+# -----------------------------
+# FILE LOCATIONS (IMPORTANT)
+# -----------------------------
+hba_file = '/etc/postgresql/pg_hba.conf'
+