### Description
Running kamailio in kubernetes (steps
[here](https://github.com/CyCoreSystems/astricon-2016/issues/1)) but getting an
"invalid host or interface name" error when parsing the alias in kamailio.cfg
As per
https://github.com/kamailio/kamailio/blob/9df27ff7afbf1cf8ee7b3afd1741355e9f6f866e/src/core/cfg.y#L2263
DOTS and MINUS are not allowed?
GCE FQDN of server nodes currently have a format like this:
```gke-foo-cluster-default-pool-4b9e42c9-50mh.c.foo-project-0.internal```
### Troubleshooting
Doesn't exist. node names in the cloud are not customizable.
#### Reproduction
set the alias in kamailio.cfg to ```my-server.my-domain.internal```
#### Debugging Data
N/A
#### Log Messages
```
2017-08-31T03:34:27Z gke-foo-cluster-default-pool-4b9e42c9-50mh confd[15]: INFO
Backend set to env
2017-08-31T03:34:27Z gke-foo-cluster-default-pool-4b9e42c9-50mh confd[15]: INFO
Starting confd
2017-08-31T03:34:27Z gke-foo-cluster-default-pool-4b9e42c9-50mh confd[15]: INFO
Backend nodes set to
2017-08-31T03:34:27Z gke-foo-cluster-default-pool-4b9e42c9-50mh confd[15]: INFO
/etc/kamailio/kamailio.cfg has md5sum 17481ad2235ef9698da57c6e90d5ac2b should
be fb5d75c2654ab2264b11fab5802bd4b7
2017-08-31T03:34:27Z gke-foo-cluster-default-pool-4b9e42c9-50mh confd[15]: INFO
Target config /etc/kamailio/kamailio.cfg out of sync
2017-08-31T03:34:27Z gke-foo-cluster-default-pool-4b9e42c9-50mh confd[15]: INFO
Target config /etc/kamailio/kamailio.cfg has been updated
0(1) CRITICAL: <core> [cfg.y:3372]: yyerror_at(): parse error in config file
/etc/kamailio/kamailio.cfg, line 35, column 30-36: syntax error
0(1) CRITICAL: <core> [cfg.y:3372]: yyerror_at(): parse error in config file
/etc/kamailio/kamailio.cfg, line 35, column 30-36: invalid host or interface
name
0(1) CRITICAL: <core> [cfg.y:3375]: yyerror_at(): parse error in config file
/etc/kamailio/kamailio.cfg, line 35, column 37:
ERROR: bad config file (3 errors)
```
#### SIP Traffic
N/A
### Possible Solutions
Let the parser accept server and domain names with "-"
### Additional Information
Kamailio version: upstream? as per the Dockerfile the image is coming from:
```
FROM debian:jessie
# Debian Linux
RUN apt-get update && apt-get install -y curl && apt-get clean
# Install kamailio
RUN curl -qO http://deb.kamailio.org/kamailiodebkey.gpg && \
apt-key add kamailiodebkey.gpg && \
echo "deb http://deb.kamailio.org/kamailio jessie main\ndeb-src
http://deb.kamailio.org/kamailio jessie main" >
/etc/apt/sources.list.d/kamailio.list
RUN apt-get update && apt-get install -y kamailio kamailio-json-modules
kamailio-postgres-modules kamailio-redis-modules kamailio-utils-modules &&
apt-get clean
# Install confd (we need at least 0.7.0 for the "exists" function
RUN curl -o /usr/sbin/confd -O -J -L
"https://github.com/kelseyhightower/confd/releases/download/v0.11.0/confd-0.11.0-linux-amd64";
RUN chmod +x /usr/sbin/confd
```
* **Operating System**:
Debian Jessie
```
Linux gke-foo-cluster-default-pool-4b9e42c9-50mh 4.4.52+ #1 SMP Thu Jun 15
15:23:01 PDT 2017 x86_64 GNU/Linux
```
Please confirm if this docker image is built from the Kamailio's upstream
version in order to fix it if not.
tks.
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