[SR-Users] Kamailio in cloud environments

Mon Nov 11 08:31:14 CET 2019

Nice idea Alex.

I use import_file and include_file and fill this with my settings from
Puppet.

Many ways to get your config strings.

There is also some ENV stuff for Kamailio to feature config strings into
startup for container environments AFAIK.

Cheers
Karsten

Alex Balashov <abalashov at evaristesys.com> schrieb am Mo., 11. Nov. 2019,
06:45:

> I prefer more flexibility, and so use a slightly more ornate approach
> involving the Jinja2 template engine (inspired by Jango)[1] and Python
> 3. I'll spread it in the network in the hope that it helps someone.
>
> --- kamailio-settings.yaml ---
> listeners:
>   - proto: udp
>     addr: 127.0.0.1
>     port: 5060
>
>   - proto: tcp
>     addr: 172.30.105.10
>     port: 5060
>
> db_conn:
>   driver: mysql
>   user: kamailio_ro
>   password: abc123
>   host: 172.30.106.11
>   name: kamailio
> ------------------------------
>
> And the Kamailio config:
>
> --- kamailio.cfg.tpl ----
> #!define DB_URL "{{ db_conn['driver'] }}://{{ db_conn['user'] }}:{{
> db_conn['password'] }}@{{ db_c
> onn['host'] }}/{{ db_conn['name'] }}"
>
> ...
>
> {% for l in listeners -%}
> listen={{ l['proto'] }}:{{ l['addr'] }}:{{ l['port'] }}
> {% endfor %}
> -------------------------
>
> And:
>
> --- apply.py ---
> #!/usr/bin/python3
>
> import sys, os, re, yaml
> from jinja2 import Template, Environment
>
> env = Environment()
> cfg_buf = None
> settings = None
>
>
> with open('/usr/local/etc/kamailio/kamailio.cfg.tpl', 'r') as f:
>   cfg_buf = f.read()
>
> tpl_instance = env.from_string(cfg_buf)
>
> with open('kamailio-settings.yaml', 'r') as f:
>   settings = yaml.load(f.read(), Loader=yaml.FullLoader)
>
> finished = tpl_instance.render(settings)
>
> with open('/usr/local/etc/kamailio/kamailio.cfg', 'w') as f:
>   f.write(finished)
> ----------------
>
> Then, this goes in the systemd unit:
>
>    ExecStartPre=/usr/bin/python3 /opt/evariste/scripts/apply.py
>
> Result:
>
> ---
> #!define DB_URL "mysql://kamailio_ro:abc123@172.30.106.11/kamailio"
>
> ...
>
> listen=udp:127.0.0.1:5060
> listen=tcp:172.30.105.10:5060
> ---
>
> -- Alex
>
> [1] https://jinja.palletsprojects.com/en/2.10.x/
>
> On Mon, Nov 11, 2019 at 08:00:46AM +0300, Sergey Safarov wrote:
>
> > You can also update kamailio.cfg to include listeners.cfg
> > Example. Need add to kamailio.cfg
> >
> > ####### Listeners ##########
> > include_file "/var/run/kamailio/listeners-eth0.cfg"
> >
> > Before kamailio started you will generate listeners.cfg file.
> > This may by done by drop-in file.
> > Need create
> "/etc/systemd/system/kamailio.service.d/10-listners-eth0.conf"
> > with content
> > [Service]
> > ExecStartPre=/bin/curl -s -S --output
> /var/run/kamailio/listeners-eth0.cfg
> > http://169.254.169.254/latest/meta-data/public-ipv4
> > ExecStartPre=/bin/sed --in-place --regexp-extended -e
> > 's/(.*)/listen=udp:\1:5060\nlisten=tcp:\1:5060\n/'
> > /var/run/kamailio/listeners-eth0.cfg
> >
> >
> >
> > On Mon, Nov 11, 2019 at 2:50 AM David Villasmil <
> > david.villasmil.work at gmail.com> wrote:
> >
> > > That's the one, thanks @Karsten!
> > >
> > >
> > > More info, i changed my systemd unit to execute a script when starting
> up,
> > > like so:
> > >
> > > # cat /etc/systemd/system/multi-user.target.wants/kamailio.service
> > > [Unit]
> > > Description=Kamailio (OpenSER) - the Open Source SIP Server
> > > After=network.target
> > >
> > > [Service]
> > > Type=forking
> > > Environment='CFGFILE=/etc/kamailio/kamailio.cfg'
> > > Environment='SHM_MEMORY=64'
> > > Environment='PKG_MEMORY=8'
> > > Environment='USER=kamailio'
> > > Environment='GROUP=kamailio'
> > > EnvironmentFile=-/etc/default/kamailio
> > > EnvironmentFile=-/etc/default/kamailio.d/*
> > > # PIDFile requires a full absolute path
> > > PIDFile=/var/run/kamailio/kamailio.pid
> > > ExecStart=/etc/kamailio/startkam.sh
> > > Restart=on-abort
> > >
> > > [Install]
> > > WantedBy=multi-user.target
> > >
> > > And /etc/kamailio/startkam.sh is like:
> > >
> > > #!/bin/bash
> > >
> > > MYSQL=$(/etc/kamailio/aws-getpass.sh dev us-east-1 dburl)
> > > SHM_MEMORY=64
> > > PKG_MEMORY=8
> > > USER=kamailio
> > > GROUP=kamailio
> > > CFGFILE=/etc/kamailio/kamailio.cfg
> > > /usr/sbin/kamailio -P /var/run/kamailio/kamailio.pid -f $CFGFILE -m
> > > $SHM_MEMORY -M $PKG_MEMORY -u $USER -g $GROUP -A "DBURL=\"$MYSQL\"" -A
> > > "CBDBURL=\"cb=>$MYSQL\"" -A "ASGDBURL=\"asg=>$MYSQL\""
> > >
> > > which in turn calls /etc/kamailio/aws-getpass.sh, which is the actual
> > > script talking to AWS via BOTO3 to get the data i need.
> > >
> > > You can just change the params and use them in your kam script normally
> > > like:
> > >
> > > modparam("acc", "db_url", DBURL )
> > >
> > > Hope that helps.
> > >
> > > Regards,
> > >
> > > David Villasmil
> > > email: david.villasmil.work at gmail.com
> > > phone: +34669448337
> > >
> > >
> > > On Sun, Nov 10, 2019 at 9:22 PM Alex Balashov <
> abalashov at evaristesys.com>
> > > wrote:
> > >
> > >> -A ... oh wow. That's savvy! Cheers.
> > >>
> > >> On Sun, Nov 10, 2019 at 08:51:59PM +0100, Karsten Horsmann wrote:
> > >>
> > >> > Hi David,
> > >> >
> > >> > You mean this thread from may 2019.
> > >> > https://lists.kamailio.org/pipermail/sr-users/2019-May/105599.html
> > >> >
> > >> > Pro Tipp, search on lists.kamailio.org/pipermail/ to get your link.
> > >> Great
> > >> > help the mailing list archive btw.
> > >> >
> > >> > Cheers
> > >> > Karsten
> > >> >
> > >> > David Villasmil <david.villasmil.work at gmail.com> schrieb am So.,
> 10.
> > >> Nov.
> > >> > 2019, 19:03:
> > >> >
> > >> > > I needed to discover the user/pass for the dB when kamailio
> starts so
> > >> as
> > >> > > not to store it locally. I get the data via an AWS script, then
> start
> > >> > > kamailio passing the parameters, then use of those in the script.
> You
> > >> can
> > >> > > do exactly this to get and set the current ip address.
> > >> > >
> > >> > > I don’t know how to share a thread from this mailing list, but
> search
> > >> for
> > >> > > the subject “ define a DBURL with SLQOPS fails” and you will find
> all
> > >> info
> > >> > > there.
> > >> > >
> > >> > > On Sun, 10 Nov 2019 at 17:48, Alex Balashov <
> > >> abalashov at evaristesys.com>
> > >> > > wrote:
> > >> > >
> > >> > >> On Sun, Nov 10, 2019 at 06:16:44PM +0100, Alejandro Recarey
> wrote:
> > >> > >>
> > >> > >> > Hi, I am trying to get kamailio working cloud provider,
> autoscaling
> > >> > >> > them behind a TCP load balancer.
> > >> > >> >
> > >> > >> > Is there a way for kamailio to discover its Public IP at
> startup?
> > >> Or
> > >> > >> > do people generally program their own startup scripts that
> modify
> > >> the
> > >> > >> > kamailio config file before starting it?
> > >> > >>
> > >> > >> They generally do the latter, especially since public IP
> discovery
> > >> > >> mechanisms tend to be specific to the cloud provider.
> > >> > >>
> > >> > >> But various templating mechanisms make this quite easy to do.
> > >> > >>
> > >> > >> --
> > >> > >> Alex Balashov | Principal | Evariste Systems LLC
> > >> > >>
> > >> > >> Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free)
> > >> > >> Web: http://www.evaristesys.com/, http://www.csrpswitch.com/
> > >> > >>
> > >> > >> _______________________________________________
> > >> > >> Kamailio (SER) - Users Mailing List
> > >> > >> sr-users at lists.kamailio.org
> > >> > >> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
> > >> > >>
> > >> > > --
> > >> > > Regards,
> > >> > >
> > >> > > David Villasmil
> > >> > > email: david.villasmil.work at gmail.com
> > >> > > phone: +34669448337
> > >> > > _______________________________________________
> > >> > > Kamailio (SER) - Users Mailing List
> > >> > > sr-users at lists.kamailio.org
> > >> > > https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
> > >> > >
> > >>
> > >> > _______________________________________________
> > >> > Kamailio (SER) - Users Mailing List
> > >> > sr-users at lists.kamailio.org
> > >> > https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
> > >>
> > >>
> > >> --
> > >> Alex Balashov | Principal | Evariste Systems LLC
> > >>
> > >> Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free)
> > >> Web: http://www.evaristesys.com/, http://www.csrpswitch.com/
> > >>
> > >> _______________________________________________
> > >> Kamailio (SER) - Users Mailing List
> > >> sr-users at lists.kamailio.org
> > >> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
> > >>
> > > _______________________________________________
> > > Kamailio (SER) - Users Mailing List
> > > sr-users at lists.kamailio.org
> > > https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
> > >
>
> > _______________________________________________
> > Kamailio (SER) - Users Mailing List
> > sr-users at lists.kamailio.org
> > https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>
>
> --
> Alex Balashov | Principal | Evariste Systems LLC
>
> Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free)
> Web: http://www.evaristesys.com/, http://www.csrpswitch.com/
>
> _______________________________________________
> Kamailio (SER) - Users Mailing List
> sr-users at lists.kamailio.org
> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>
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