The controller will retrieve all the endpoints at the beginning of its
loop. When changes need to be applied, the provider may need to query
the endpoints again. Allow the provider to skip the queries if its data was
cached.
This commit adds ability to use TLS transport for etcd.
New logic is applied when the etcd URL has https:// scheme.
TLS parameters are passed in the environment variables:
ETCD_CA_FILE - path to CA certificate. If not specified, then
system-provided certificates are used.
ETCD_CERT_FILE - client certificate
ETCD_KEY_FILE - client key file
- either both of none of this two must be specified
ETCD_TLS_SERVER_NAME - expected CN of the certificate. Useful when
URL points to a different domain from that in server certificate
ETCD_TLS_INSECURE - if set to "1" (or "true" or "yes") makes client
bypass server certificate validation.
Also for unification with other providers and rest of connection
settings, etcd URL is no longer specified in the command line, but
rather in ETCD_URLS environment variable (defaults to
http://localhost:2379). More than one comma-separated URL can be
specified. All of the URLs must start with either http:// or https://
Also, now it possible to communicate with etcd through proxy specified
in standard environment variables
This commit adds ability to have several endpoints for single domain
name with CoreDNS by adding random to the DNS name and setting
TargetStrip to 1 so that it will be stripped upon read. When TXT
record is encountered, it is merged with the first available A
record, if any available. Otherwise dedicated record is created.
This commit adds support for CoreDNS through its etcd middleware.
Because the middleware is backward compatible with SkyDNS this
commit adds support for SkyDNS as well. In fact, new provider
is available under two names in CLI (coredns and skydns).
All interactions with middleware happen through etcd cluster,
whose location (URIs) is specified via --etcd CLI parameter
by default http://localhost:2379).
The provider translates CoreDNS/DkyDNS SRV records to
A/CNAME + optional TXT endpoints, when reading from etcd and
combines A/CNAME with TXT endpoints back into single SRV record
when writing it back.
Also adds github.com/coreos/etcd package to glide.yaml and vendor folder
because it is used by the provider
