first commit

replicator-side/docker-compose.yml

@@ -0,0 +1,19 @@
+services:
+  postgres-replica:
+    image: postgres:17
+    container_name: postgres-replica
+    restart: unless-stopped
+    ports:
+      - "7447:5432"
+    environment:
+      PRIMARY_HOST: 57.128.212.174
+      PRIMARY_PORT: 7447
+      REPLICATION_USER: replicator
+      REPLICATION_PASSWORD: replicator_password
+    volumes:
+      - ./data:/var/lib/postgresql/data
+      - ./postgresql.conf:/etc/postgresql/postgresql.conf:ro
+      - ./pg_hba.conf:/etc/postgresql/pg_hba.conf:ro
+      - ./replica-entrypoint.sh:/replica-entrypoint.sh:ro
+    command: ["/bin/bash", "/replica-entrypoint.sh"]
+

replicator-side/init-replica.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+set -e
+
+DATA_DIR="/var/lib/postgresql/data"
+
+if [ -f "$DATA_DIR/PG_VERSION" ]; then
+  echo "Data directory already initialized, skipping base backup"
+  exit 0
+fi
+
+echo "Initializing replica from primary..."
+
+rm -rf "$DATA_DIR"/*
+export PGPASSWORD="$REPLICATION_PASSWORD"
+
+pg_basebackup \
+  -h "$PRIMARY_HOST" \
+  -p "$PRIMARY_PORT" \
+  -U "$REPLICATION_USER" \
+  -D "$DATA_DIR" \
+  -Fp \
+  -Xs \
+  -R \
+  -P
+
+echo "Replica base backup completed."
+

replicator-side/pg_hba.conf

@@ -0,0 +1,4 @@
+local   all             all                                     trust
+host    all             all             127.0.0.1/32            trust
+host    all             all             ::1/128                 trust
+

replicator-side/postgresql.conf

@@ -0,0 +1,15 @@
+listen_addresses = '*'
+port = 5432
+
+wal_level = replica
+hot_standby = on
+max_connections = 100
+
+hot_standby_feedback = on
+wal_keep_size = 256MB
+
+logging_collector = on
+log_destination = 'stderr'
+
+hba_file = '/etc/postgresql/pg_hba.conf'
+

replicator-side/replica-entrypoint.sh

@@ -0,0 +1,34 @@
+#!/bin/bash
+set -e
+
+DATA_DIR="/var/lib/postgresql/data"
+
+if [ ! -f "$DATA_DIR/PG_VERSION" ]; then
+  echo "Running pg_basebackup from primary..."
+
+  rm -rf "$DATA_DIR"/*
+  export PGPASSWORD="$REPLICATION_PASSWORD"
+
+  pg_basebackup \
+    -h "$PRIMARY_HOST" \
+    -p "$PRIMARY_PORT" \
+    -U "$REPLICATION_USER" \
+    -D "$DATA_DIR" \
+    -Fp \
+    -Xs \
+    -R \
+    -P
+
+  echo "Fixing ownership and permissions..."
+  chown -R postgres:postgres "$DATA_DIR"
+  chmod 0700 "$DATA_DIR"
+else
+  echo "Replica already initialized"
+fi
+
+echo "Starting postgres as postgres user..."
+
+exec gosu postgres postgres \
+  -c config_file=/etc/postgresql/postgresql.conf \
+  -c hba_file=/etc/postgresql/pg_hba.conf
+