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Support for ETCD SRV name suffix (#2029)

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Add support for ETCD SRV name suffix as per description in ETCD dosc:

> The -discovery-srv-name flag additionally configures a suffix to the SRV name that is queried during discovery. Use this flag to differentiate between multiple etcd clusters under the same domain. For example, if discovery-srv=example.com and -discovery-srv-name=foo are set, the following DNS SRV queries are made:
> 
> _etcd-server-ssl-foo._tcp.example.com
> _etcd-server-foo._tcp.example.com

All test passes, but not been tested on the live ETCD system yet... Please, take a look and send feedback. 

Resolves #2028
This commit is contained in:
DavidPavlicek
2021-08-13 15:49:01 +02:00
committed by GitHub
parent ccfe30729e
commit 195b8bf049
6 changed files with 13 additions and 7 deletions
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docs/ENVIRONMENT.rst
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@@ -59,7 +59,8 @@ Etcd
- **PATRONI\_ETCD\_USE\_PROXIES**: If this parameter is set to true, Patroni will consider **hosts** as a list of proxies and will not perform a topology discovery of etcd cluster but stick to a fixed list of **hosts**.
- **PATRONI\_ETCD\_PROTOCOL**: http or https, if not specified http is used. If the **url** or **proxy** is specified - will take protocol from them.
- **PATRONI\_ETCD\_HOST**: the host:port for the etcd endpoint.
- **PATRONI\_ETCD\_SRV**: Domain to search the SRV record(s) for cluster autodiscovery.
- **PATRONI\_ETCD\_SRV**: Domain to search the SRV record(s) for cluster autodiscovery. Patroni will try to query these SRV service names for specified domain (in that order until first success): ``_etcd-client-ssl``, ``_etcd-client``, ``_etcd-ssl``, ``_etcd``, ``_etcd-server-ssl``, ``_etcd-server``. If SRV records for ``_etcd-server-ssl`` or ``_etcd-server`` are retrieved then ETCD peer protocol is used do query ETCD for available members. Otherwise hosts from SRV records will be used.
- **PATRONI\_ETCD\_SRV\_SUFFIX**: Configures a suffix to the SRV name that is queried during discovery. Use this flag to differentiate between multiple etcd clusters under the same domain. Works only with conjunction with **PATRONI\_ETCD\_SRV**. For example, if ``PATRONI_ETCD_SRV_SUFFIX=foo`` and ``PATRONI_ETCD_SRV=example.org`` are set, the following DNS SRV query is made:``_etcd-client-ssl-foo._tcp.example.com`` (and so on for every possible ETCD SRV service name).
- **PATRONI\_ETCD\_USERNAME**: username for etcd authentication.
- **PATRONI\_ETCD\_PASSWORD**: password for etcd authentication.
- **PATRONI\_ETCD\_CACERT**: The ca certificate. If present it will enable validation.
docs/SETTINGS.rst
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@@ -156,7 +156,8 @@ Most of the parameters are optional, but you have to specify one of the **host**
- **use\_proxies**: If this parameter is set to true, Patroni will consider **hosts** as a list of proxies and will not perform a topology discovery of etcd cluster.
- **url**: url for the etcd.
- **proxy**: proxy url for the etcd. If you are connecting to the etcd using proxy, use this parameter instead of **url**.
- **srv**: Domain to search the SRV record(s) for cluster autodiscovery.
- **srv**: Domain to search the SRV record(s) for cluster autodiscovery. Patroni will try to query these SRV service names for specified domain (in that order until first success): ``_etcd-client-ssl``, ``_etcd-client``, ``_etcd-ssl``, ``_etcd``, ``_etcd-server-ssl``, ``_etcd-server``. If SRV records for ``_etcd-server-ssl`` or ``_etcd-server`` are retrieved then ETCD peer protocol is used do query ETCD for available members. Otherwise hosts from SRV records will be used.
- **srv\_suffix**: Configures a suffix to the SRV name that is queried during discovery. Use this flag to differentiate between multiple etcd clusters under the same domain. Works only with conjunction with **srv**. For example, if ``srv_suffix: foo`` and ``srv: example.org`` are set, the following DNS SRV query is made:``_etcd-client-ssl-foo._tcp.example.com`` (and so on for every possible ETCD SRV service name).
- **protocol**: (optional) http or https, if not specified http is used. If the **url** or **proxy** is specified - will take protocol from them.
- **username**: (optional) username for etcd authentication.
- **password**: (optional) password for etcd authentication.