Coredns postgres

CoreDNS can be configured to use a PostgreSQL database as a backend for DNS records through the pdsql plugin. This plugin leverages PowerDNS's generic SQL backend capabilities, allowing CoreDNS to retrieve DNS records from a PostgreSQL database. 
Here's an example of how to configure CoreDNS to use PostgreSQL with the pdsql plugin: 
1. Corefile Configuration: 
The Corefile is the main configuration file for CoreDNS. To use PostgreSQL, you would include the pdsql plugin in your Corefile as follows: 
. {
    pdsql pgsql postgres://user:password@host:port/database_name
    # Other plugins can be added here, e.g., forward, cache, etc.
}

• .: This specifies that the server block applies to the root zone, meaning it will handle all DNS queries that are not explicitly handled by other server blocks. 
• pdsql: This enables the PowerDNS SQL backend plugin. 
• pgsql: This indicates that the database dialect is PostgreSQL. 
• postgres://user:password@host:port/database_name: This is the connection string for your PostgreSQL database. 
    • Replace user with your PostgreSQL username. 
    • Replace password with your PostgreSQL password. 
    • Replace host with the hostname or IP address of your PostgreSQL server. 
    • Replace port with the port your PostgreSQL server is listening on (default is 5432). 
    • Replace database_name with the name of your PostgreSQL database. 

2. PostgreSQL Database Schema: 
The pdsql plugin expects a specific database schema that is compatible with PowerDNS's generic SQL backend. You would need to create tables in your PostgreSQL database to store DNS records, such as domains, records, and potentially supermasters and comments. 
Example Table Structure (simplified): 
CREATE TABLE domains (
    id SERIAL PRIMARY KEY,
    name VARCHAR(255) NOT NULL UNIQUE,
    master VARCHAR(128) DEFAULT NULL,
    last_check INT DEFAULT NULL,
    type VARCHAR(6) NOT NULL,
    notified_serial INT DEFAULT NULL,
    account VARCHAR(40) DEFAULT NULL
);

CREATE TABLE records (
    id SERIAL PRIMARY KEY,
    domain_id INT NOT NULL REFERENCES domains(id) ON DELETE CASCADE,
    name VARCHAR(255) DEFAULT NULL,
    type VARCHAR(10) DEFAULT NULL,
    content VARCHAR(64000) DEFAULT NULL,
    ttl INT DEFAULT NULL,
    prio INT DEFAULT NULL,
    change_date INT DEFAULT NULL,
    disabled BOOLEAN DEFAULT FALSE,
    ordername VARCHAR(255) DEFAULT NULL,
    auth BOOLEAN DEFAULT TRUE
);

3. Populating the Database: 
You would then populate these tables with your DNS records. For example, to add an A record for www.example.com pointing to 192.168.1.100: 
INSERT INTO domains (name, type) VALUES ('example.com', 'NATIVE');
INSERT INTO records (domain_id, name, type, content, ttl)
VALUES ((SELECT id FROM domains WHERE name = 'example.com'), 'www.example.com', 'A', '192.168.1.100', 3600);

Note: This is a basic example. For a production environment, you would need to consider aspects like database security, replication, and more comprehensive schema design. You might also need to compile CoreDNS with the pdsql plugin if it's not included in your default CoreDNS build. 

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