Product Description Cloud Databases
Cloud databases — a service for deploying and managing high-performance and fault-tolerant clusters supported databases in the cloud.
You can work with cloud databases in control panel through Cloud Database API or Terraform.
The product supports user types and roles, projects and project limits and quotas.
Supported cloud databases
How cloud databases work
Cloud databases are deployed in a cluster. A cluster is one or more database servers (nodes) between which replication is configured. The nodes in the cluster are based on cloud platform resources.
Cloud databases support monitoring, backup and scaling cluster. It is possible to increase fault tolerance cluster and configure replication between nodes.
Database settings when creating the cluster are selected by default and depend on the cluster configuration and database version. You can change them if necessary.
Customization networks cloud database depends on the specifics of the infrastructure in which the cloud database is embedded.
Monitoring
In cloud databases, you can monitor the status of the cluster in the dashboard:
- View information about cluster node utilization and database load in the form of graphs in the control panel;
- watch the status of the cluster;
- receive notifications when the disk is full.
Cluster and database node metrics can also be exported in Prometheus format.
Read more about monitoring in the instructions for PostgreSQL, PostgreSQL for 1C, PostgreSQL TimescaleDB, MySQL sync, MySQL semi-sync, Redis and Kafka.
Backup
In cloud databases, the cluster is backed up automatically using WAL-G. All databases except Redis are restored to Point-in-Time Recovery. The frequency of backups depends on the selected database.
Backups are stored In Selectel object storage isolated from other users' backups. Backups cannot be unloaded. Automatic backups cannot be disabled.
For more information on backups, see the instructions for PostgreSQL, PostgreSQL for 1C, PostgreSQL TimescaleDB, MySQL sync, MySQL semi-sync, Redis.
Scaling
A cloud database cluster can be scaled — for example, increase vCPU and RAM to improve cluster performance. You can also change a fixed node configuration to an arbitrary configuration or an arbitrary configuration to a fixed configuration, but only with more disk space.
The configuration change process depends on the availability of replicas. The configuration change time depends on the amount of data in the cluster.
More information about scaling in the instructions for PostgreSQL, PostgreSQL for 1C, PostgreSQL TimescaleDB, MySQL sync, MySQL semi-sync, Redis and Kafka.
Fault tolerance and replication
By default, the cluster consists of one main node — the master node. When connected to the master node, all operations are available: read (SELECT) and write (INSERT, UPDATE, DELETE and others). To provide cluster fault tolerance, add replicas — full copies of the master node. They are available for read-only data (SELECT). If the master node is unavailable, the replicas will take over its role and the cluster will operate normally. They can also be used to reduce the load on the master node during active reads.
Read more about fault tolerance in the instructions for PostgreSQL, PostgreSQL for 1C, PostgreSQL TimescaleDB, MySQL sync, MySQL semi-sync, Redis.
Cloud database settings
Database settings affect the performance of the database cluster. When you create a database cluster, the values for all settings are set automatically. The values are selected to ensure high cluster performance and vary depending on the cluster configuration and database version.
If the automatic values are not suitable for your tasks, for all cloud databases except Redis, you can set your values when creating a cluster or change the settings in an already created cluster.
For more information on setting up cloud databases, see the instructions for PostgreSQL, PostgreSQL for 1C, PostgreSQL TimescaleDB, MySQL sync, MySQL semi-sync and Kafka.
Networks
When creating a cloud database cluster, it is necessary to consider the specifics of the infrastructure in which the cloud database is embedded — whether the cluster nodes need to be accessed from the Internet and whether network connectivity with other Selectel services is required.
The cluster can be connected:
- to a private subnet — a subnet with no access from the Internet;
- public subnet — all addresses on the public subnet are accessible from the Internet.
Once a cluster is created, the subnet cannot be changed.
For more information on establishing network connectivity between a Selectel dedicated server and a cloud database cluster, see the instructions to PostgreSQL, PostgreSQL for 1C, PostgreSQL TimescaleDB, MySQL sync, MySQL semi-sync, Redis and Kafka.
Areas of responsibility
Selectel provides
- hardware selection for high DBMS performance;
- installing an operating system;
- installation and optimal configuration of the DBMS;
- updating and maintenance of the operating system and service software;
- Cluster reliability and fault tolerance — when you build a fault-tolerant cluster, we provide failover in the event of a failure;
- Configuring and maintaining the service network for cluster replicas;
- Backup — automatic creation and storage of copies;
- cluster status monitoring system in the control panel;
- secure data storage and protection against theft and leakage;
- compliance with the requirements of 152-FZ;
- Availability of resources to scale the cluster if you initiate scaling;
- technical support.
The user provides
- correct connection to the database;
- optimality of writing database queries;
- the schema and structure of the data in the database;
- initiating cluster scaling.
If you need help with database administration, order service administration services.