example of database

Author: amiller

dstack-database/Dockerfile

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+FROM ubuntu:22.04
+
+# Create postgres user first
+RUN groupadd -r postgres --gid=999 && \
+    useradd -r -g postgres --uid=999 postgres
+
+# Install dependencies
+RUN apt-get update
+RUN DEBIAN_FRONTEND=noninteractive TZ=Etc/UTC apt-get -y install tzdata
+RUN apt-get install -y \
+    gosu \
+    python3-pip \
+    postgresql-14 \
+    postgresql-client-14 \
+    openjdk-11-jre-headless \
+    curl \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install ZooKeeper
+RUN curl -L https://dlcdn.apache.org/zookeeper/zookeeper-3.8.4/apache-zookeeper-3.8.4-bin.tar.gz | tar xz -C /opt \
+    && mv /opt/apache-zookeeper-3.8.4-bin /opt/zookeeper
+
+# Install Patroni
+RUN pip3 install patroni[zookeeper] psycopg2-binary
+
+# Create necessary directories with proper permissions
+RUN mkdir -p /data/zookeeper /data/postgres /etc/patroni && \
+    chown -R postgres:postgres /data/postgres && \
+    chmod 700 /data/postgres && \
+    chown -R postgres:postgres /etc/patroni
+
+# Create necessary directories
+RUN mkdir -p /data/zookeeper /data/postgres /etc/patroni
+
+# ZooKeeper configuration
+COPY zoo.cfg /opt/zookeeper/conf/
+
+# Patroni configuration
+COPY patroni.yml /etc/patroni/
+
+# Startup script
+COPY start.sh /
+RUN chmod +x /start.sh
+
+EXPOSE 2181 5432 8008
+
+CMD ["/start.sh"]

dstack-database/README.md

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+# Distributed Database using Dstack
+
+Based on Patroni configuration of postgres, with Zookeeper for leader management.
+
+Needs 4 nodes to tolerate 1 failure.

dstack-database/docker-compose.yml

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+version: '3'
+
+services:
+  node1:
+    build: .
+    hostname: node1
+    environment:
+      - NODE_NAME=node1
+      - NODE_IP=node1
+    volumes:
+      - node1-zk:/data/zookeeper
+      - node1-pg:/data/postgres
+    ports:
+      - "5432:5432"
+      - "2181:2181"
+      - "8008:8008"
+
+  node2:
+    build: .
+    hostname: node2
+    environment:
+      - NODE_NAME=node2
+      - NODE_IP=node2
+    volumes:
+      - node2-zk:/data/zookeeper
+      - node2-pg:/data/postgres
+
+  node3:
+    build: .
+    hostname: node3
+    environment:
+      - NODE_NAME=node3
+      - NODE_IP=node3
+    volumes:
+      - node3-zk:/data/zookeeper
+      - node3-pg:/data/postgres
+
+  node4:
+    build: .
+    hostname: node4
+    environment:
+      - NODE_NAME=node4
+      - NODE_IP=node4
+    volumes:
+      - node4-zk:/data/zookeeper
+      - node4-pg:/data/postgres
+
+volumes:
+  node1-zk:
+  node1-pg:
+  node2-zk:
+  node2-pg:
+  node3-zk:
+  node3-pg:
+  node4-zk:
+  node4-pg:

dstack-database/patroni.yml

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+scope: postgres-cluster
+namespace: /db/
+name: #{NODE_NAME}
+
+restapi:
+  listen: 0.0.0.0:8008
+  connect_address: #{NODE_IP}:8008
+
+zookeeper:
+  hosts: node1:2181,node2:2181,node3:2181,node4:2181
+  session_timeout: 30
+  reconnect_timeout: 10
+
+bootstrap:
+  dcs:
+    ttl: 30
+    loop_wait: 10
+    retry_timeout: 10
+    maximum_lag_on_failover: 1048576
+    postgresql:
+      use_pg_rewind: true
+      parameters:
+        max_connections: 100
+        shared_buffers: 256MB
+        wal_level: replica
+        hot_standby: "on"
+        max_wal_senders: 10
+        max_replication_slots: 10
+        wal_keep_segments: 8
+
+postgresql:
+  listen: 0.0.0.0:5432
+  connect_address: #{NODE_IP}:5432
+  data_dir: /data/postgres
+  bin_dir: /usr/lib/postgresql/14/bin
+  pgpass: /tmp/pgpass
+  authentication:
+    replication:
+      username: replicator
+      password: replpass
+    superuser:
+      username: postgres
+      password: secretpassword
+  parameters:
+    unix_socket_directories: '/var/run/postgresql'
+    
+  pg_hba:
+    - host replication replicator all md5
+    - host all all all md5

dstack-database/start.sh

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+#!/bin/bash
+set -e
+
+# Fix permissions on runtime
+mkdir -p /var/run/postgresql
+chown postgres:postgres /var/run/postgresql
+chmod 2777 /var/run/postgresql
+
+# Start ZooKeeper
+echo ${NODE_NAME} | sed 's/^node//' > /data/zookeeper/myid
+/opt/zookeeper/bin/zkServer.sh start
+
+# Replace template variables
+sed -i "s/#{NODE_NAME}/$NODE_NAME/g" /etc/patroni/patroni.yml
+sed -i "s/#{NODE_IP}/$NODE_IP/g" /etc/patroni/patroni.yml
+
+# Start Patroni as postgres user
+exec gosu postgres patroni /etc/patroni/patroni.yml
+
+# Start Patroni
+exec patroni /etc/patroni/patroni.yml

dstack-database/zoo.cfg

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+tickTime=2000
+initLimit=10
+syncLimit=5
+dataDir=/data/zookeeper
+clientPort=2181
+maxClientCnxns=60
+autopurge.snapRetainCount=3
+autopurge.purgeInterval=1
+server.1=node1:2888:3888
+server.2=node2:2888:3888
+server.3=node3:2888:3888
+server.4=node4:2888:3888