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pdsql on CoreDNS: DNS and Service Discovery

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pdsql
2017-12-09 · via pdsql on CoreDNS: DNS and Service Discovery

Description

pdsql uses PowerDNS generic sql as backend.

Use jinzhu/gorm database drivers, supports as many databases as Gorm does.

Syntax

pdsql <dialect> <arg> {
    // enable debug mode
    debug [db]
    // create table for test
    auto-migrate
}

Install Driver

pdsql needs db drivers for dialect, to install a driver you need to add an import in plugin.cfg, like

pdsql_mysql:github.com/jinzhu/gorm/dialects/mysql
pdsql_sqlite:github.com/jinzhu/gorm/dialects/sqlite

pdsql_mysql and pdsql_sqlite are meaningless, specified to prevent duplicates.

Examples

Start a server on port 1053, use test.db as backend.

test.:1053 {
    pdsql sqlite3 ./test.db {
        debug db
        auto-migrate
    }
}

Prepare data for test.

# Insert records for wener.test
sqlite3 ./test.db 'insert into records(name,type,content,ttl,disabled)values("wener.test","A","192.168.1.1",3600,0)'
sqlite3 ./test.db 'insert into records(name,type,content,ttl,disabled)values("wener.test","TXT","TXT Here",3600,0)'

When queried for “wener.test. A”, CoreDNS will respond with:

;; QUESTION SECTION:
;wener.test.			IN	A

;; ANSWER SECTION:
wener.test.		3600	IN	A	192.168.1.1

When queried for “wener.test. ANY”, CoreDNS will respond with:

;; QUESTION SECTION:
;wener.test.			IN	ANY

;; ANSWER SECTION:
wener.test.		3600	IN	A	192.168.1.1
wener.test.		3600	IN	TXT	"TXT Here"

Wildcard

# domain id 1
sqlite3 ./test.db 'insert into domains(name,type)values("example.test","NATIVE")'
sqlite3 ./test.db 'insert into records(domain_id,name,type,content,ttl,disabled)values(1,"*.example.test","A","192.168.1.1",3600,0)'

When queried for “first.example.test. A”, CoreDNS will respond with:

;; QUESTION SECTION:
;first.example.test.		IN	A

;; ANSWER SECTION:
first.example.test.	3600	IN	A	192.168.1.1