In this article i will show U how to solve DRBD split brain error.

Problem
DRBD does not connect between server

#/proc/drbd
version: 8.4.0 (api:1/proto:86-100)
GIT-hash: 28753f559ab51b549d16bcf487fe625d5919c49c build by gardner@, 2011-12-1
2 23:52:00
0: cs:StandAlone ro:Secondary/Unknown ds:UpToDate/DUnknown   r—–
ns:0 nr:0 dw:0 dr:0 al:0 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:b oos:76

#log message on the node1
Mar  7 15:38:05 node1 kernel: block drbd0: Split-Brain detected but unresolved, dropping connection!

#/proc/drbd on the node2
version: 8.4.0 (api:1/proto:86-100)
GIT-hash: 28753f559ab51b549d16bcf487fe625d5919c49c build by gardner@, 2011-12-1
2 23:52:00
0: cs:StandAlone ro:Primary/Unknown ds:UpToDate/DUnknown   r—–
ns:0 nr:0 dw:144 dr:4205 al:5 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:b oos:100

Solution:
Step 1: Define one node as secondary and discard data on this (all = resource name )

drbdadm secondary all
drbdadm disconnect all
drbdadm — –discard-my-data connect all

Step 2: Define anoher node as primary and connect

drbdadm primary all
drbdadm disconnect all
drbdadm connect all

We will install asterisk13 with pjproject bounled  on a CentOS 6.x x64 as it is recommended from Asterisk developers.

you can also use this installation for Webrtc config.

First lets update all packages:

yum -y update

Then we will install all necessary packages and add epel repository please read comments while the text.

Some optional packages already included.

#epel repositiry installation
yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-6.noarch.rpm
yum install nano

# WARNING check that selinux is disabled in /etc/sysconfig/selinux
#need to reboot after changes selinux file
yum install unixODBC unixODBC-devel libtool-ltdl libtool-ltdl-devel
yum install wget gcc gcc-c++ ncurses-devel libxml2-devel sqlite-devel libuuid-devel openssl-devel libsrtp-devel

#install mysql http php and ODBC connector (optional)
yum install mysql-server httd mysql-connector-odbc php mysql php
yum install svn htop sngrep wget mysql-devel jansson-devel git patch autoconf

#get last asterisk and install it
cd /usr/src/ wget http://downloads.asterisk.org/pub/telephony/asterisk/asterisk-13-current.tar.gz
tar xzf asterisk-13-current.tar.gz
cd asterisk-13*

#support mp3
contrib/scripts/get_mp3_source.sh
#configure and installation servises
./configure –with-pjproject-bundled –libdir=/usr/lib64
make menuselect
make
make install
make samples
make config
make install-logrotate

#start services
/etc/init.d/mysqld start
/etc/init.d/asterisk start
/etc/init.

In this instruction we will  forward  3389 TCP port to local Server address 192.168.1.200

1) Go to IP -> Firewall -> NAT

2) Click the  RED “+” to add a new NAT rule. Set the “Chain” to “dstnat”, “Protocol” to “tcp”, and “Dst. Port” to “3999”. Set the “In. Interface” to your WAN port. ( In Interface  is IMPORTANT).

3) Click the “Action” tab, change the “Action” value to “dst-nat”, the “To Addresses” to “192.168.1.200” and “To Ports” to “3999”.

4) Click APPLY

Done  all  traffic comes from internet on port  3389 will forward to local server  192.168.1.200 on same port

P.S.

For Asterisk  you should forward:

5060 UDP — as  SIP (signaling )

10000-20000 UDP  -as RTP (voice traffic)

If you need  extra services:

22 TCP – as  SSH

80 TCP -as  HTTP