Vyacheslav Gapon – personal blog, manuals, articles, notes, development
Here is an example of a script written in PHP, for sending SMS messages through the Goip4 gateway.
The script receives data from the SQL database with a query and alternately sends SMS to each number, and also writes an entry about sending it to a special sms table.
Continue reading “SMS sending script via Goip4 gateway”
To enable or disable the firmware password on the Mac and MacBooks, you must press the Command+R keys or the Option(Alt) key after turning on the sound, then select the menu “Utilities“-“Firmware password utility “and select” Enable firmware password “in the window that opens and set the password.
Continue reading “Using the firmware password on a Mac”
I’ll give an example of a simple check whether something is running on TCP port 179 which uses BGP.
Create the following data item with the name Zabbix in the new Zabbix template or right in the network node “Template App BGP Service” (where 192.168.10.2 is the address of the host on which the performance of the BGP is checked):
Name: BGP service is running Type: Zabbix agent Key: net.tcp.service[tcp,192.168.10.2,179] Type of information: Numeric (positive integer) Data type: Decimal Displaying the value: Service state
If Zabbix-agent is installed on the node, then we will create two data elements and in the field “Key:” we will indicate:
proc.num[bgpd] proc.num[zebra]
If the data element reports 0, then BGP does not work, or the port is closed, if 1 is OK.
Accordingly, we will add a trigger that will notify about the idle BGP:
Name: BGP does not work on {HOST.NAME}
Expression: {Template App BGP Service:net.tcp.service[tcp,192.168.10.2,179].max(#3)}=0
Все.
I will give some examples of triggers for Zabbix.
Let’s assume there are data elements, starting from them we will create triggers.
An example of a trigger informing that traffic on the switch port is more than permissible:
Continue reading “Examples of Zabbix Triggers”I will give an example of monitoring the number of running Samba processes, as well as creating a triggering trigger when there are no running processes.
In a system with Samba, a Zabbix agent must be installed.
See my popular articles about Zabbix.
Create a template, for example, with a name “Template Service Samba” and add the following data item to it:
Name: Number of processes nmbd Type: Zabbix agent Key: proc.num[nmbd]
Similarly, we create for smbd.
You can also create data items that represent the amount of memory used by the process, in which case the key will look like this:
proc.mem[nmbd,,sum]
And also add graphics for them.
Now add a trigger for each process to see when the process is not running:
Name: Does not work nmbd on {HOST.NAME}
Expression: {Template Service Samba:proc.num[nmbd].max(1)}<1
Done.
I noticed once in the browser the error of opening a GoIP SMS crypt:
[authz_core:error] [pid 23415] [client 192.168.56.1:50388] AH01630: client denied by server configuration: /usr/local/goip/
As it turned out, the script was supposed to work in apache2 version 2.2 and in the file /etc/apache2/conf-enabled/goip.conf the following parameters were specified:
Order allow,deny Allow from all
And in my case, an apache2 version of the newer 2.4 was installed, in which access control is configured a little differently, and to fix the error, change the above parameters to:
Require all granted
Or to restrict access to IP by resolving locally and to specified addresses:
Require local Require ip 192.168.56.1 192.168.22.10
And restart apache2 to apply the changes:
sudo service apache2 restart
See also:
Access Control Apache2
Here are examples of viewing and working with iRedAdmin white and black lists.
Continue reading “White and black list iRedAdmin”I noticed one error after installing FreePBX:
Invalid command ‘RewriteEngine’, perhaps misspelled or defined by a module not included in the server configuration
To solve it, you need to activate the rewrite module in apache2:
sudo a2enmod rewrite
And restart apache2 to apply the changes:
sudo service apache2 restart
Done.
To see a table with a list of databases and their size in megabytes, you can execute a SQL query:
Continue reading “Monitoring the size of a MySQL database or table in Zabbix”On the test, I’ll take the Cisco Catalyst 6509-E switch and configure it to forward DHCP packets to the DHCP server.
The switch is configured as L3 with assigned IP addresses in each VLAN.
Connect to the switch through the console or telnet and go to the configuration mode:
enable configure t
Let’s assume the DHCP server address is 192.168.11.1 and we want to configure the transfer of DHCP broadcast packets to it on VLAN 100, for this we execute the commands:
interface Vlan100 ip helper-address 192.168.11.1 exit
Exit the configuration mode and save the configuration:
exit write
Done.