Author Archives: Vyacheslav

Installing the Digium Asterisk GUI

Digium Asterisk GUI – web-management interface Asterisk.

Today I’ll sculpt it to Asterisk 11 on Ubuntu Server 14.04 LTS.
Switch directly to the root user:

sudo -i

Download it:

apt-get install subversion
mkdir -p ~/asterisk-gui
cd ~/asterisk-gui
svn checkout http://svn.digium.com/svn/asterisk-gui/branches/2.0/

We compile and install:

cd 2.0
./configure
make
make install

Just in case, we’ll make a copy of the Asterisk configuration files:

cp -r /etc/asterisk /etc/asterisk.original

Open the configuration file manager.conf for example in the editor nano (Ctrl+X to exit the editor, y/n to save or cancel changes):

nano /etc/asterisk/manager.conf

The main parameters that must be configured in the manager.conf configuration file are:

[general]
enabled = yes
webenabled = yes
bindaddr = 0.0.0.0
[USERNAME]
secret = PASSWORD
read = system,call,log,verbose,command,agent,user,config
write = system,call,log,verbose,command,agent,user,config

At the very end of the file, replace the symbol # with; otherwise you can not enter under the login and password specified above.

Now edit http.conf:

nano /etc/asterisk/http.conf

In it we will specify the following parameters of the web server:

enabled=yes
enablestatic=yes
bindaddr=0.0.0.0
prefix=asterisk

Let’s check the settings:

make checkconfig

Delete the empty folder and specify a link to the real one with the files of the web server:

rmdir /usr/share/asterisk/static-http/
ln -s /var/lib/asterisk/static-http/ /usr/share/asterisk/

Restarting Asterisk:

/etc/init.d/asterisk restart

Now Digium Asterisk GUI should open by link http://192.168.56.102:8088/asterisk/static/config/index.html, where 192.168.56.102 this is the IP or Server domain with Asterisk.

To log in, we’ll specify the username and password you wrote earlier in the manager.conf file

Done.

Zabbix installation on Ubuntu from distribution packages

On the test, I installed Zabbix 3.4 in Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS.
Links to other versions of Zabbix can be found on the official website www.zabbix.com or http://repo.zabbix.com/zabbix/.
For example, Zabbix 3.4 for Ubuntu is located here http://repo.zabbix.com/zabbix/3.4/ubuntu/pool/main/z/zabbix-release/.

After installing Zabbix, transferred the data from the old Zabbix 2.2 server to it, simply exporting the templates first, then network nodes, set cards and complex screens.

Let’s proceed to installation, add the official source of packages to the system (example for Ubuntu 14.04 LTS (trusty)):

wget http://repo.zabbix.com/zabbix/3.4/ubuntu/pool/main/z/zabbix-release/zabbix-release_3.4-1+trusty_all.deb
sudo dpkg -i zabbix-release_3.4-1+trusty_all.deb
sudo apt update

For Ubuntu 16.04 LTS (xenial):

wget http://repo.zabbix.com/zabbix/3.4/ubuntu/pool/main/z/zabbix-release/zabbix-release_3.4-1+xenial_all.deb
sudo dpkg -i zabbix-release_3.4-1+xenial_all.deb
sudo apt update

For Ubuntu 18.04 (Bionic Beaver):

wget http://repo.zabbix.com/zabbix/3.4/ubuntu/pool/main/z/zabbix-release/zabbix-release_3.4-1+bionic_all.deb
sudo dpkg -i zabbix-release_3.4-1+bionic_all.deb
sudo apt-get update

Perform the installation of Zabbix:

sudo apt-get install zabbix-server-mysql zabbix-frontend-php zabbix-agent

Connect to the MySQL server and create a database:

mysql -uroot -p
create database zabbix character set utf8 collate utf8_bin;
grant all privileges on zabbix.* to zabbix@localhost identified by 'ПАРОЛЬ';
quit;

We import the standard data into the created database:

cd /usr/share/doc/zabbix-server-mysql
zcat create.sql.gz | mysql -uroot -p zabbix

For example, open the Zabbix server configuration file in the nano text editor (in nano, press Ctrl+X to exit, y/n to save or cancel changes):

sudo nano /etc/zabbix/zabbix_server.conf

Specify the MySQL database name, user name and password:

DBHost=localhost
DBName=zabbix
DBUser=zabbix
DBPassword=PASSWORD

Run the Zabbix server process:

sudo service zabbix-server start

You need to fix the PHP configuration for Zabbix. The Apache configuration file for the Zabbix web interface is located in /etc/apache2/conf.d/zabbix or /etc/apache2/conf-enabled/zabbix.conf. Some minimal PHP configuration parameters have already been set there:

php_value max_execution_time 300
php_value memory_limit 128M
php_value post_max_size 16M
php_value upload_max_filesize 2M
php_value max_input_time 300
php_value always_populate_raw_post_data -1
php_value date.timezone Europe/Kiev

Restart the web server to apply the changes:

sudo service apache2 restart
sudo service zabbix-server restart

Make sure that the Zabbix agent and the Zabbix server are started at system startup and, if necessary, enable:

sudo systemctl is-enabled zabbix-agent.service
sudo systemctl is-enabled zabbix-server.service
sudo systemctl enable zabbix-agent.service
sudo systemctl enable zabbix-server.service

The Zabbix web interface is available through a browser at http://HOST/zabbix.
By default, the user name for logging in through the web interface is admin or Admin, the password is zabbix.

See also:
Installing and Configuring Zabbix Agent in Ubuntu

Asterisk Error Solution “Context ‘local’ tries to include nonexistent context ‘parkedcalls'”

I screwed the DAHDI board somehow and noticed the following error when I dialed the call from the analog line:

WARNING[7238]: pbx.c:12314 ast_context_verify_includes: Context ‘local’ tries to include nonexistent context ‘parkedcalls’

The error occurred because the res_parking module was not loaded to load it, open the asterisk console and execute the command:

sudo asterisk -vvr
module load res_parking

To automatically load it when starting Asterisk, in the file /etc/asterisk/modules.conf, in the [modules] block, add the line:

load => res_parking.so

Configuring FreeRADIUS DHCP for ABillS

Suppose you installed FreeRADIUS 2 as written in this article – Installation and configuration of the ABillS billing system
Now copy the dhcp.conf file into the FreeRADIUS configuration:

sudo cp /usr/abills/misc/freeradius/v2/dhcp.conf /usr/local/freeradius/etc/raddb/sites-enabled/

Continue reading “Configuring FreeRADIUS DHCP for ABillS”

The solution of the error “PDOException “could not find driver””

I noticed somehow the following error:

PDOException “could not find driver”

The reason may be not activated pdo_mysql or not installed php5-mysql.
Let’s look at the PDO:

php -i|grep PDO

In php.ini or connected configuration files there should be a line:

extension=pdo.so
extension=pdo_mysql.so

Let’s see the information about php5-mysql:

dpkg --get-selections | grep php5-mysql

If not installed, then install, in Ubuntu it can be done like this:

sudo apt-get install php5-mysql
sudo apt-get install php-mysql
sudo /etc/init.d/apache2 restart
sudo service apache2 restart

The solution of the error “Unable to create channel of type ‘SIP’ (cause 20 – Subscriber absent)”

I noticed one time when I received a call from the Asterisk console:

dial_exec_full: Unable to create channel of type ‘SIP’ (cause 20 – Subscriber absent)

In the context of the dialplan, I make a call simultaneously to two phones:

exten => s,5,DIAL(SIP/204&SIP/203,19)

Sometimes one of the IP phones is turned off, which is why this error occurs, informing that there is no subscriber.
To solve it, you just need to turn on the IP phone.

You can see information about SIP in the Asterisk console:

asterisk -rvv
sip show peers
sip show peer NUMBER
quit

If the client’s IP address is null and expire is -1, the SIP client is not online:

Expire: -1
Addr->IP: (null)

Comments in PHP

In PHP, comments can be of three types.

I will give an example of the first (one-line in the style of C ++):

<?php
echo "TEXT"; // Comment
?>

The second one in Unix style:

<?php
echo "TEXT"; # Comment
?>

The third multiline:

<?php
     /* Comment
        Comment
        Comment */
     echo "TEXT";
?>