chore(deploy): add replication deployment assets

mysql/.my.cnf.example

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+[client]
+host=mysql
+port=3306
+user=root
+password=CHANGE_ME_TO_MYSQL_ROOT_PASSWORD

mysql/configure-replica.sh

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+#!/bin/sh
+set -eu
+
+: "${MYSQL_ROOT_PASSWORD:?MYSQL_ROOT_PASSWORD is required}"
+: "${MASTER_MYSQL_HOST:?MASTER_MYSQL_HOST is required}"
+: "${MYSQL_REPLICATION_USER:?MYSQL_REPLICATION_USER is required}"
+: "${MYSQL_REPLICATION_PASSWORD:?MYSQL_REPLICATION_PASSWORD is required}"
+
+MASTER_MYSQL_PORT="${MASTER_MYSQL_PORT:-3306}"
+REPLICA_MYSQL_HOST="${REPLICA_MYSQL_HOST:-mysql-replica}"
+REPLICA_MYSQL_PORT="${REPLICA_MYSQL_PORT:-3306}"
+
+echo "Waiting for MySQL source ${MASTER_MYSQL_HOST}:${MASTER_MYSQL_PORT}..."
+until mysqladmin ping -h"${MASTER_MYSQL_HOST}" -P"${MASTER_MYSQL_PORT}" -u"${MYSQL_REPLICATION_USER}" -p"${MYSQL_REPLICATION_PASSWORD}" --silent; do
+  sleep 2
+done
+
+echo "Waiting for local replica ${REPLICA_MYSQL_HOST}:${REPLICA_MYSQL_PORT}..."
+until mysqladmin ping -h"${REPLICA_MYSQL_HOST}" -P"${REPLICA_MYSQL_PORT}" -uroot -p"${MYSQL_ROOT_PASSWORD}" --silent; do
+  sleep 2
+done
+
+echo "Configuring GTID replication..."
+mysql -h"${REPLICA_MYSQL_HOST}" -P"${REPLICA_MYSQL_PORT}" -uroot -p"${MYSQL_ROOT_PASSWORD}" <<SQL
+STOP REPLICA;
+RESET REPLICA ALL;
+SET GLOBAL super_read_only = OFF;
+SET GLOBAL read_only = OFF;
+CHANGE REPLICATION SOURCE TO
+  SOURCE_HOST='${MASTER_MYSQL_HOST}',
+  SOURCE_PORT=${MASTER_MYSQL_PORT},
+  SOURCE_USER='${MYSQL_REPLICATION_USER}',
+  SOURCE_PASSWORD='${MYSQL_REPLICATION_PASSWORD}',
+  SOURCE_AUTO_POSITION=1,
+  GET_SOURCE_PUBLIC_KEY=1;
+START REPLICA;
+SET GLOBAL read_only = ON;
+SET GLOBAL super_read_only = ON;
+SQL
+
+mysql -h"${REPLICA_MYSQL_HOST}" -P"${REPLICA_MYSQL_PORT}" -uroot -p"${MYSQL_ROOT_PASSWORD}" -e "SHOW REPLICA STATUS\\G"

mysql/init-master.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+set -eu
+
+: "${MYSQL_ROOT_PASSWORD:?MYSQL_ROOT_PASSWORD is required}"
+: "${MYSQL_REPLICATION_USER:?MYSQL_REPLICATION_USER is required}"
+: "${MYSQL_REPLICATION_PASSWORD:?MYSQL_REPLICATION_PASSWORD is required}"
+
+mysql_note "Creating MySQL replication user '${MYSQL_REPLICATION_USER}'"
+
+mysql --protocol=socket -uroot -p"${MYSQL_ROOT_PASSWORD}" <<SQL
+CREATE USER IF NOT EXISTS '${MYSQL_REPLICATION_USER}'@'%' IDENTIFIED WITH mysql_native_password BY '${MYSQL_REPLICATION_PASSWORD}';
+GRANT REPLICATION SLAVE, REPLICATION CLIENT ON *.* TO '${MYSQL_REPLICATION_USER}'@'%';
+FLUSH PRIVILEGES;
+SQL

mysql/master.cnf

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+[mysqld]
+server-id=1
+log-bin=mysql-bin
+binlog-format=ROW
+gtid-mode=ON
+enforce-gtid-consistency=ON
+log-replica-updates=ON
+binlog-expire-logs-seconds=604800
+relay-log-recovery=ON

mysql/replica.cnf

@@ -0,0 +1,10 @@
+[mysqld]
+server-id=2
+relay-log=mysql-relay-bin
+read-only=ON
+super-read-only=ON
+gtid-mode=ON
+enforce-gtid-consistency=ON
+log-replica-updates=ON
+relay-log-recovery=ON
+skip-replica-start=ON