Jul 8, 2024 · Logical replication is available in Amazon RDS for PostgreSQL version 10. This read replica DB instance is an asynchronously created physical replica of the source DB instance. Logical replication is required for replication from the blue environment to the green environment. So I set up an RDS replica and set rds. enable_pgactive parameter to 1 and then create the extension in the database. group_replication_enabled: 1 如果您将 rds. The default values of 10 are sufficient for this tutorial. max_wal_senders – The number of tasks that can run in parallel. e. You can also set up replication between an RDS for MySQL DB instance and a MariaDB or MySQL instance that is external to Amazon RDS. There is a proposal to allow a logical replication slots WAL retention to be limited. Create a new parameter group (non-default group). Changes are sent out in streams identified by logical replication slots. The upgrade process using logical replication involves the following high-level steps: Promote a replica to a standalone, if available, or restore a standalone DB instance from a snapshot. Streaming replication can be logical replication. This was unexpected, as I thought I might need to recreate Doing this allows Amazon RDS to fully copy the parameter group before it is used by the new DB cluster. logical_replication parameter to 1 by following these steps: i. Connecting to a DB instance running the PostgreSQL database engine. DB snapshot copy charges apply to the data transfer. on publisher: CREATE PUBLICATION mypublication FOR TABLE &lt;mytable&gt;; on subscriber: CREATE SUBSCRIPTION Aug 10, 2018 · Especially in Amazon Web Services RDS, this is a problem because RDS won't give you SUPERUSER role so you could connect and turn off the slots. Based on its setup, It also copies available writer/reader DB instances and applies the same configuration to the Staging/Green cluster. Working with PostgreSQL features supported by Amazon RDS for PostgreSQL. logical” in the Parameters search field to locate the parameter named rds. This means that sometimes the replica can't keep up with the primary DB instance. For Actions, choose Create read replica. The transaction on the primary is not committed until it has been successfully 49. logical_replication parameter. Connect to the DB instance and call the mysql. This can be done by configuring the following settings in your postgresql. Mar 4, 2020 · 5. Logical replication sends data to the replica in a logical format. Nov 18, 2022 · rds_replication role — to grant permissions to manage logical slots and to stream data using logical slots. An Oracle replica database is a physical copy of your primary database. logical_replication=1 is set. In the case of a walsender, they are encapsulated inside replication protocol WAL messages as described in Section 55. If the source is an RDS for PostgreSQL or Aurora PostgreSQL instance, you need to enable rds. Oct 11, 2021 · Next, go to the AWS RDS Console and find your instance. Enter “rds. To enable logical replication, set the parameter rds. Dec 4, 2023 · つい最近だがzero-etlがRDSのpostgresをサポートしやがったのでこの際取り組む。 経緯. In the Parameters search field, type rds to find the rds. As a next step, I check from the server side the parameters with this query : SELECT name,setting FROM pg_settings WHERE name IN ('wal_level','rds. Reboot the RDS for PostgreSQL DB instance so that your changes take effect. You must have superuser access to grant the rds_replication role Feb 25, 2022 · I know it is not a relevant example but AWS DMS (which used Postgres native logical replication) gives you an option to stop/resume the replication. The workaround is to use a 10. logical_replication to 1. Jul 10, 2023 · Enable logical replication. Step #3: Create a Provider node (on the source database). The following diagram illustrates the architecture of logical replication. logical_replication parameter serves the same purpose as a standalone PostgreSQL server's wal_level parameter and other parameters that control the write-ahead log file management. logical_replication static parameter and set its value to 1. logical_replication parameter, but when i run SHOW rds. Limitations. rds_rds_start_replication_until_gtid procedure, GTID-based replication must be enabled. Create a parameter group for your RDS database. The DB cluster volume is made up of multiple copies of the data for Jan 10, 2018 · 5. Oct 4, 2021 · Use cases for PostgreSQL native logical replication. You can create one or more replicas of a given source DB Instance and serve high-volume application Choose the DB instance that you want to use as the source for a read replica. For more information, see Working with parameter groups. Jul 25, 2021 · rds. rds. The rds. We discuss two replication capabilities in Amazon RDS and Amazon Aurora: multi-source replication and replication filtering. AWS DMS supports change data capture (CDC) using logical replication. After the read replica is created, you can see it on the Databases page in the RDS console. Multi-source replication is supported Find the rds. They are also used for replicating tables from databases to data lakes, business intelligence tools, and other targets. The lagging size of the replica lagging the most in terms of WAL data received. May 25, 2022 · Set the rds. Mar 28, 2019 · To enable logical replication with Aurora PostgreSQL, set up logical replication slots on your instance and stream changes from the database through these slots. For a summary of the differences between Oracle replicas and other DB engines, see Differences among read When backup replication is configured for a DB instance, RDS initiates a cross-Region copy of all snapshots and transaction logs as soon as they are ready on the DB instance. rds_start_replication procedures to start replication with your replication source. The architecture has the following Mar 16, 2024 · Logical replication in AWS RDS PostgreSQL is a mechanism that allows data to be replicated from one database to another by replicating the changes made to the data. This enables logical replication. logical_replication パラメータは静的パラメータなので、有効にするには DB インスタンスの再起動が必要です。 May 23, 2023 · The primary and standby servers must be running the same PostgreSQL major version for successful replication. Set the rds. Logical replication, as the name implies, operates at a logical level, replicating specific tables, databases, or even individual rows based on defined replication rules. Apr 29, 2020 · Logical replication with pg_recvlogical does currently not work correctly on RDS. To turn on logical replication in RDS Dec 17, 2019 · Alternatively, enable RDS Storage autoscaling to mitigate any unforeseen space issues. Configure the streams pool with the initialization parameter STREAMS_POOL_SIZE. Amazon RDS Read Replicas provide enhanced performance and durability for Amazon RDS database (DB) instances. RDS supports both physical and logical replication. . Apr 9, 2021 · Modify the following parameters at the source and reboot the instance to apply changes. Oracle Database doesn't permit writes in a replica, but you can promote a replica to make it writable. logical_replication parameter to 1 in order to get wal_level to logical. I'm working with AWS RDS Postgres v13 in a multi-AZ setup, using a logical replication slot for replicating to another RDS instance. logical_replication. Feb 29, 2024 · In this post, we show you how to use advanced replication features between MySQL-compatible databases such as Amazon Aurora MySQL-Compatible Edition clusters or Amazon Relational Database Service (Amazon RDS) for MySQL instances. Apply the parameter group to the database instance. Since the 'data_directory_mode' parameter was introduced with 11. 10. Complete the following prerequisites on the source database to prepare for a logical migration. Open the custom DB cluster parameter group associated with your RDS for PostgreSQL Multi-AZ DB cluster. Postgres. By default, logical replication is turned off in AWS-managed PostgreSQL DB instances. Use physical replication if you are asking this question. 6, 9. Set max_replication_slots and max_wal_sender to the number of concurrent Data Replication assets you want to run. To enable a user account other than the master account to initiate logical replication, you must grant the account the rds_replication role. logical_replication parameter and set it to 1, to turn on logical replication. May 23, 2022 · 1. logical_replication parameter in your DB CLUSTER parameter group to 1. iv. Dec 30, 2022 · I need to change the rds. It shows Replica in the Role column. Two-phase Commit Support for Logical Decoding. 4 (Postgres), providing much faster replication than Slony, Bucardo or Londiste, as well as cross-version upgrades. logical_replication to 1; you can set this parameter in just a few clicks in the Amazon RDS Management Console. They make it easy to elastically scale out beyond the capacity constraints of a single DB instance for read-heavy database workloads. For more details, see Migrating PostgreSQL from on-premises or Amazon EC2 to Amazon RDS using logical replication. Staging/Green cluster stays in sync with Production cluster using logical replication. For MySQL, MariaDb, Aurora MySql Blue Green Deployments RDS uses logical binlog replication. 5, 9. This way, the same information is logged as with replica, plus information needed to allow extracting logical change sets from the WAL. iii. Amazon Aurora PostgreSQL-compatible edition and Amazon RDS for PostgreSQL version 11 and later support logical replication using pglogical. Logical replication: Only selected tables and data changes are replicated to the secondary database. Nov 27, 2022 · To use a Blue/Green Deployment in your Aurora MySQL DB cluster, you should turn on binary logging, changing the value for the binlog_format parameter from OFF to ROW in the DB cluster parameter group. Save the changes. If it is, we recommend that you drop the self-managed replication slots and subscriptions across all databases in the blue environment, proceed with switchover, then recreate them to resume replication. Before upgrading, be sure that you know the purpose of logical replication slots that are in use and confirm that they can be Jan 24, 2024 · In the following sections, we discuss three replication options to perform an out-of-place upgrade. Make sure this group has rds. max_replication_slots – Set this parameter to the total number of subscriptions that you plan to create. To enable logical replication of a self-managed PostgreSQL source database, set the following parameters and values in the postgresql. To create a read replica from a source DB instance, use the AWS CLI command create-db-instance-read-replica. Inspired by insights from RDS and David’s blog, we explored how this approach applies to on-premises databases. Choose Edit parameters to access the property values, and then choose 1 from the selector to turn on the feature. logical_replication = 1 and restart the Postgres Service. I think that that is just what you need, but it is not clear when/if it will become available. Wanted to check if there is a similar option available in pglogical. When 若要在 RDS for PostgreSQL 中開啟邏輯複寫，請修改自訂參數群組以將 rds. logical_replication 参数。 Mar 15, 2024 · 1. This static parameter requires the reboot of the writer instance of the Aurora PostgreSQL DB cluster to Logical replication slots are typically used for AWS Database Migration Service (AMS DMS) migration. We chose logical replication because it allows us to: Port over a subset of tables, so we can start with a much smaller storage footprint in the destination database (reduced storage hardware footprint can increase These messages are either returned by the replication slot SQL interface or are sent by a walsender. Associate the instance with a custom DB parameter group with logical replication (rds. After the mysql. Oct 26, 2023 · Logical replication uses a publish and subscribe model with one or more subscribers subscribing to one or more publications on a publisher node. Using a custom DNS server for outbound network access. Offline and Online Migrations Require: The character set on the source database must be the same as the target database. After initiating a reboot with failover for testing, I noticed the replication continued seamlessly despite the switch in primary and standby roles. Logical replication first performs the initial load of data already present in the source tables and then continues to replicate ongoing changes. group_replication_enabled parameter. For example, grant rds_replication to <my_user>. Using pglogical extension that provides logical streaming replication and more capabilities such as copying the initial schema of the database, support for TRUNCATE, ability to replicate DDL, etc. An Oracle replica in mounted mode is called a mounted replica. To enable logical replication for an Amazon RDS PostgreSQL database instance: Create a new parameter group with the following configuration: Set the rds. logical_replication parameter to 0. I tried to run this in the database. A method of logically replicating data changes from one node ("publisher") to another node ("subscriber"). logical_replication 設定為 1。 MySQL. ALTER SYSTEM SET rds. Securing connections to RDS for PostgreSQL with SSL/TLS. PostgreSQL provides infrastructure to stream the modifications performed via SQL to external consumers. Mar 22, 2020 · I started replication like this: On source: CREATE ROLE replrds; ALTER ROLE replrds WITH NOSUPERUSER INHERIT NOCREATEROLE NOCREATEDB LOGIN REPLICATION NOBYPASSRLS CONNECT PASSWORD 'xxxxx'; GRANT ALL PRIVILEGES ON DATABASE db_name to replrds; GRANT ALL PRIVILEGES ON ALL TABLES IN SCHEMA public TO replrds; CREATE PUBLICATION rds_pub FOR ALL TABLES; May 24, 2020 · While checking for roles, you don't see that you belong to rds_superuser(or not). Engine log + Binlog -> byte encoded -> binlog stream -> binlog apply. RDS also copies all of the DB instances in the DB cluster. We are considering enabling logical (streaming) replication on our existing Aurora PG 13 cluster for CDC? We want to keep our aurora read replicas as is, but I haven't found good resource that ex To turn on logical replication for a newly created RDS for PostgreSQL DB instance – Create a new DB custom parameter group and set the static parameter rds. 2. If you’re using logical replication you might consider setting up some monitoring around this metric as it could indicate that your logical replication slot on RDS has switched to inactive - meaning it is no longer consuming the Apr 4, 2023 · The “logical” choice. The process starts with taking a snapshot of the data on the Accepted Answer. Sep 22, 2016 · A new rds_replication role, assigned to the master user by default, can be used to grant permissions to manipulate and stream data through logical slots. For Availability and durability, choose Multi-AZ DB cluster. v. Best way to ensure that this works how intended is to create a new role right away in role rds_superuser. To configure replication between Oracle DB instances, you can create replica databases. As part of applying this parameter, also set the parameters wal_level , max_wal_senders , max_replication_slots , and max_connections . Edit your postgresql. Begin #. CREATE / ALTER / DROP a database object (TABLE An Aurora Replica is an independent endpoint in an Aurora DB cluster, best used for scaling read operations and increasing availability. Using logical replication. Already tried applying the DB Cluster Parameter Group to the regional cluster and only to the writer instance. You also need to set the rds. An Aurora DB cluster can include up to 15 Aurora Replicas located throughout the Availability Zones of the Aurora DB cluster's AWS Region. DNS resolution must be enabled when group replication is enabled with the rds. Modify Database options to use the new DB parameter group: RDS > Databases > Modify. Sep 14, 2016 · In order to implement logical replication to a non-RDS database, you will need to ensure that the user account for the PostgreSQL database has the rds_superuser and rds_replication roles. It is a static parameter that requires a reboot to take effect. Logical replication in PostgreSQL is done on a per-database basis, which means there will be at minimum one publication and subscription per database. PDF RSS. 6 と互換) 以降 サブスクライバー: Aurora PostgreSQL データベースバージョン 2. May 26, 2020 · It is a complete cluster- and instance-level replication. conf configuration file: Set wal_level = logical. Open the RDS console, in the navigation pane select Databases, select your The rds. Daniel Bentes. Logical Replication extension for PostgreSQL 15, 14, 13, 12, 11, 10, 9. logical_replication=1 shared_preload_libraries = 'pglogical' Reboot your Amazon RDS instance for these parameters to take effect. 会社でぽちぽちetlプロセス構築をおこなっている関係上、zero-etlには注目していたのだが、生憎Aurora, Redshiftのpostgresは対応されていなかったことから試したことがなかった。 To migrate from Amazon RDS for PostgreSQL to Aurora PostgreSQL, use one of the following methods depending on your use case: Using a snapshot. logical_replication) turned on. rds_start_replication_until procedure stops replication, you can promote the read replica to be the new primary DB instance by using the instructions in Promoting a read replica to be a standalone DB instance. When the upgrade is complete, upgrade the pg_statistics table by running ANALYZE on all user databases. By default, its value is set to 0, indicating that the feature is deactivated by default. See PostgreSQL CREATE PUBLICATION / SUBSCRIPTION. Aug 23, 2021 · For this post, we set rds. For DB instance identifier, enter a name for the read replica. Open the RDS console, in the navigation pane select Databases, select your Aug 18, 2023 · Synchronous using RDS SQL Server, which utilises a feature called 'Always On' or 'Mirroring' where the replication to the secondary site is a logical synchronous apply under the covers. For the remaining sections, specify your DB cluster settings. The default value for this parameter is 0, meaning that it's turned off by default. The logical setting also adds information necessary to support logical decoding. Logical Replication. Using a pg_dump utility. 0 (PostgreSQL 10. Turn on logical decoding. When you choose Create Blue/Green Deployment, it creates a new staging environment and runs automated tasks to prepare the database for production. Synchronous replication: Changes made to the primary database are replicated to the secondaries immediately. You need to set rds. For instructions, see the Amazon RDS documentation. The following are typical use cases for logical replication: Data migration from on-premises or self-managed PostgreSQL environments to Aurora PostgreSQL. 6 と互換) 以降。Amazon RDS for PostgreSQL データベース Apr 27, 2024 · Logical replication allows fine-grained control over the data replication, including table-level data replication. Click on the Configuration tab and find the parameter group for this database. To migrate a database from an Amazon RDS source cluster for PostgreSQL to a Managed Service for PostgreSQL target cluster: Configure Amazon RDS. To initialize the pgactive extension capability on your RDS for PostgreSQL DB instance, set the value of the rds. If you don't want to go the route of taking snapshot, encrypting it and then restoring it, the only option left is to do replication to an encrypted RDS, either using DMS or by setting up binlog replication (in case of MySQL) or WAL replication (using pglogical) in case of PostgreSQL. Use logical replication if data migration using Yandex Data Transfer is not possible for any reason. logical_replication set to 1 (true) and that max_replication_slots, max_logical_replication_workers and max_worker_processes are set to values > 0. For any of these replication options, you can use Aug 7, 2023 · In the following screenshot, rds. Stop any DMS tasks that are dependent on the RDS instance you are upgrading by setting the rds. After the DB snapshot is copied, standard charges apply to storage in the destination Region. But it seems that RDS replica doesn't react to that - SHOW ALL says wal_level = hot_standby while it should be logical. logical_replication=1 to achieve wal_level=logical. Mar 8, 2023 · Binary replication is a form of physical replication. In one RDS cluster, you can create multiple databases. Synchronous using Oracle RDS Custom, where we are able to access the underlying operating system and also make certain customisations that are not possible Jan 11, 2024 · To set up logical replication following the primary-standby pattern, start by configuring your primary database. Note: shared_preload_libraries may have multiple comma-separated values. logical_replication 参数值设置为 1，则 AWS RDS 设置 wal_level、max_wal_senders、max_replication_slots 和 max_connections 参数。更改这些参数可能会增加 WAL 生成。最好的做法是仅当您使用逻辑槽时设置 rds. DBA: Create the pglogical extension on the source and target databases. In Postgres, there are two ways to replicate data: streaming replication or logical replication. logical_replication on my writer instance still off. It's all a bit complicated. Jul 9, 2018 · The rds_replication role grants permissions to manage logical slots and to stream data using logical slots. logical_replication parameter to 1. This is enabled by setting the parameter rds. g. logical_replication to 1 in the custom parameter group associated with source Aurora PostgreSQL DB cluster. logical_replication'); Choose Create read replica. It will only use GTID if your source database is configured with GTID. In the Amazon RDS DB parameter group, set the rds. Add pglogical to the shared_preload_libraries parameter. Applies to PostgreSQL. Apply immediately or a reboot is required to reflect the configuration change into wal_level. Overview of RDS for Oracle replicas. Set max_replication_slots and max_wal_sender to the number of concurrent Data Replication assets that you want to run. Option A: Logical replication with pglogical. Jun 17, 2021 · Upgrading an Amazon RDS for Oracle DB instance with logical replication. custom_dns_resolution: 1: This parameter specifies whether to allow DNS resolution from the Amazon DNS server in your VPC. As a one step, I change the parameter of database B rds. conf file to enable logical replication by setting the wal_level to logical, and adjust max_replication_slots and max_wal_senders to accommodate the number of replicas you need. it is very important to also stop walsender to recover server memory with the following command: select pg_terminate_backend(pid) from pg_stat_replication; this will free up your server storage memory. Using an Aurora read replica. logical_replication パラメータを有効にすると、DB クラスターのパフォーマンスに影響します。 パブリッシャー: Aurora PostgreSQL バージョン 2. Using Kerberos authentication with Amazon RDS for PostgreSQL. This functionality can be used for a variety of purposes, including replication solutions and auditing. By default, only the master user account on AWS has the rds_replication role on Amazon RDS. logical_replication parameter in the database parameter group to 1. Cross-engine Events are append to the binlog (unless skipped sql_log_bin) Slaves filter using do%. In the meantime, all you can do is monitor the situation, then then drop the slot if it starts to fall behind too far. 4 and higher. Depending on your expected usage, you might also need to Oct 5, 2019 · On AWS RDS PostgreSQL 10. DDL--Data Definition Language. Adjust the value to 1 using the selector to activate the feature. We recommend that you consider the following limitations of using logical replication before starting your migration: Set rds. In the resolution provided, two source tables are replicated to two target tables using logical replication in RDS for PostgreSQL. logical_replication static parameter to 1. An Oracle replica in read-only mode is called a read replica. logical_replication 連接至資料庫執行個體。如果自訂參數群組已連接至資料庫執行個體，請更新參數群組以將 rds. 4, and generally obey the same message flow as physical replication. In both physical and logical replication, you don't have the automatic failover option that you have in Amazon RDS and Amazon Aurora. Then, associate this DB parameter group with the Source DB instance and its physical read replica. Use the binary log file name and location from the previous step. Apply the parameter group to the database. In the Parameters search field, locate the rds. Set max_replication_slots to a value greater than 1. You can use the Parameter groups page in the Amazon RDS console or the describe-db-cluster-parameters command to verify that your DB cluster parameter group is created. Jan 12, 2024 · Set rds. Additionally, logical replication can send data for a single table, database, or specific columns in a table. Logical replication slots are used to keep track of the changes that need to be replicated. Enable logical replication by setting the rds. Mar 9, 2023 · Once installed, you'll need to configure PostgreSQL to load the extension and use logical replication. WAL -> Logical Decoding/output_plugin -> logical log -> sender -> receiver & apply. I already changed the rds. logical_replication to apply these changes. So if something like this happens one might grant rds_superuser (again) to be sure that this one is resolved. The rds_replication role Jun 20, 2024 · RDS Blue/Green Deployment feature offered by AWS creates a new Staging/Green cluster from the current Production/Blue cluster. You could set up a new set of instances Nov 17, 2023 · This is a pre-requisite for Group Replication to function. rds_set_external_master (Aurora MySQL version 2) or mysql. For instructions, see Modifying parameters in a DB parameter group. And it will use the binlog_format that is specified for the source database. Subset of SQL, used for defining and managing the structure of a database. Thanks Nov 10, 2022 · Set rds. Apply the changes. answered Nov 10, 2022 at 15:04. Note that in PostgreSQL 12 (current at time of update) logical replication is stable and reliable, but quite limited. - 2ndQuadrant/pglogical RDS copies the blue environment's topology to a staging area, along with its configured features. logical_replication parameter to 1 (true) in the parameter group. These logical slots also enable the RDS for PostgreSQL to be used as a source for AWS Database Migration Service Mar 1, 2016 · Logical replication is better for some tasks, physical replication for others. May 16, 2023 · I am trying to enable logical replication from B ---> C. To use the mysql. ii. Logical Replication: Fine-Grained Control. Doing so automatically turns on the parameters rds. Using a data import from Amazon S3. Enable the logical_replication flag in that group by setting the value to 1. For an overview of Amazon RDS read replicas, see Overview of Amazon RDS read replicas. Row_format: Replicates the change or the complete statement. When the instance is available, you can use psql (or pgAdmin) to connect to the RDS for PostgreSQL DB instance. As part of applying this parameter, set the wal_level, max_wal_senders, max_replication_slots, and max_connections parameters RDS for PostgreSQL uses PostgreSQL native streaming replication to create a read-only copy of a source DB instance. x, a 10. For information about configuring replication with an external source, see Configuring binary log file position replication with an external source instance. Turn on logical replication. wal_level = logical wal_sender_timeout = 0 max_replication_slots = 10 #number of subscriptions Jun 2, 2023 · Terms. Dec 5, 2023 · Logical replication combined with Point-In-Time Recovery (PITR) in PostgreSQL offers a powerful strategy for version upgrades without significant downtime. Publication for PostgreSQL Logical Replication External replication – For RDS for PostgreSQL, makes sure that the blue environment isn't a self-managed logical source (publisher) or replica (subscriber). As a result, replication lag can occur. DB インスタンスにアタッチ済みのカスタムパラメータグループの場合は、rds. rds_set_external_source (Aurora MySQL version 3) and mysql. To set up logical replication for an RDS for PostgreSQL Multi-AZ DB cluster. 528 4 10. logical_replication parameter to 1 in the database options group for your database instance and then reboot the instance. The DB cluster is copied to the green environment, and RDS configures replication from the DB cluster in the blue environment to the DB cluster in the green environment. Working with read replicas for Amazon RDS for Oracle. This approach will empower database managers to evolve their systems with To turn on the logical replication in the target database, set the following parameters in the database parameter group. This parameter change can increase WAL generation, so Jan 17, 2022 · Perform the following steps to configure the pglogical extension for Amazon RDS for PostgreSQL and Aurora PostgreSQL: Edit the parameter group associated with your instance. logical_replication に 1 を設定して、そのパラメータグループを更新します。rds. logical_replication 設定為 1，然後將 rds. After the parameter settings in the parameter group are modified, you need to reboot the cluster for the changes to take effect, which causes an outage. Set wal_sender_timeout to 0. logical_replication TO 1; The rds_replication role to grant permissions to manage logical slots and to stream data using logical slots Set the rds. x pg_recvlogical client. 7, I turned on logical replication for a one specific table . x client will not send the command and hence work fine. This post demonstrates by promoting a read replica. logical_replication and track_commit_timestamp and sets the value of wal_level to logical. However, you can use Patroni and etcd for automatic failover management. conf: wal_level = logical shared_preload_libraries = 'pglogical'. ov tx kt an sr yk od lq gg yc