resource sakuracloud_server "serverA"{
    # (省略)
}
resource sakuracloud_server "serverB"{
    # (省略)
}

resource "null_resource" "db_replication" {
    triggers{
        # 依存を定義
        server_ids = "${sakuracloud_server.serverA.id},${sakuracloud_server.serverB.id}"
    }

    # MySQLレプリケーション開始
    provisioner "remote-exec" {
       connection {
         user = "root"
         host = "${var.server01_ip}"
         private_key = "${file("${path.root}/${var.ssh_keyfile}")}"
       }
       inline = [
          "cat << EOF | mysql -u root --password='${var.mysql_root_password}'\n${template_file.start_replication_sql01.rendered}\nEOF\n"
        ]
    }
}