We will use the bandwidth capping command “config bandwidth_control“
Write it in the following order:
Configuring low-level discovery in Zabbix
Low-level discovery allows you to automatically create data items, triggers, graphics.
Massively it is better not to use it, since in practice it noticed that it gives a significant load on the system.
Here is an example of the discovery configuration for viewing the port load of the managed switch.
To start, open the “Settings” – “Templates“, create a new template, or click “Discovery“.
Click “Create rule” and fill out the main parameters:
How to format UDF Volume in Ubuntu
I recently wanted to format the USB flash drive in the Ubuntu operating system, but since it was in UDF format, formatting was refused and many programs did not see it as a flash drive.
To begin with, let’s look at the discs:
sudo fdisk -lu
Then the solution was to execute the following command:
sudo shred -vzn 0 /dev/sdc
After that, the flash drive can be formatted by any program.
Arris Cadant C3 CMTS Manual
File size: 6 MB
Release 3.0 Standard 2.0 March 2004
HP A5800 Firmware Upgrade
The example will use the version of the HP A5800 Series Switch JC103A switch.
Continue reading “HP A5800 Firmware Upgrade”Install and configure lm-sensors
Run the command to install the utility in Ubuntu / Debian:
sudo apt-get install lm-sensors sensord
We introduce the sensor detection command:
sudo sensors-detect
Information about detected sensors will be recorded in the file /etc/modules
Let’s review the sensor data:
sensors
I’ll describe some of the start keys sensors:
-c, –config-file (specifying the configuration file)
-h, –help (display help)
-s, –set (execution of `set ‘messages (only from root)
-f, –fahrenheit (temperature display in fahrenheit)
-A, –no-adapter (do not show the adapter for each chip)
–bus-list (generating bus messages for sensors.conf
-u (raw conclusion)
-v, –version (display version of the program)
Installing and Configuring SNMPD + MRTG
MRTG (Multi Router Traffic Grapher) – a tool for displaying various data in graphs.
The installation command in Ubuntu/Debian:
sudo apt-get install mrtg snmp snmpd
In CentOS:
yum install mrtg net-snmp net-snmp-utils
The command below can tell you which additional modules are in the repository:
apt-cache search mrtg
Open the configuration file /etc/snmp/snmpd.conf
sudo nano /etc/snmp/snmpd.conf
Comment on the line:
com2sec paranoid default public
And uncomment the line:
com2sec readonly default public
Restart snmpd so that changes to the configuration file take effect:
sudo /etc/init.d/snmpd restart
You can check snmp by commands:
netstat -nlp | grep snmpd snmpwalk -v2с -c public localhost
Beginners can generate a simple configuration file with the command:
sudo cfgmaker public@localhost >> /etc/mrtg.cfg
where public is the name of the community (the password is in other words), and localhost is the host address or ip.
Example of starting the configuration file /etc/mrtg.cfg:
WorkDir: /var/www/mrtg Options[_]: growright, bits, nobanner Background[_]: #B0C4DE EnableIPv6: no Language: russian EnableSnmpV3: no Interval: 10 Refresh: 600 Include: /etc/mrtg/server1.cfg Include: /etc/mrtg/server2.cfg
Create the working directory:
sudo mkdir /var/www/mrtg
Then you must write or generate the index.html file with the command:
sudo indexmaker /etc/mrtg.cfg > /var/www/mrtg/index.html
We look at the log /var/log/mrtg.log so that there are no errors.
Here is an example of setting up SNMP on D-Link switches:
private CommunityView Read Write public CommunityView Read Only
Example of a manual start script (mrtg.sh):
#!/bin/bash #run mrtg LANG=C export $LANG /usr/bin/mrtg /etc/mrtg.cfg --logging /var/log/mrtg.log
IPTables rules for Samba
To open access to Samba in IPTables, you must add four rules at once:
sudo iptables -A INPUT -p udp -m udp --dport 137 -j ACCEPT sudo iptables -A INPUT -p udp -m udp --dport 138 -j ACCEPT sudo iptables -A INPUT -p tcp -m tcp --dport 139 -j ACCEPT sudo iptables -A INPUT -p tcp -m tcp --dport 445 -j ACCEPT
To only allow access to a particular network, for example 192.168.1.0/24:
sudo iptables -A INPUT -s 192.168.1.0/24 -p udp -m udp --dport 137 -j ACCEPT sudo iptables -A INPUT -s 192.168.1.0/24 -p udp -m udp --dport 138 -j ACCEPT sudo iptables -A INPUT -s 192.168.1.0/24 -p tcp -m tcp --dport 139 -j ACCEPT sudo iptables -A INPUT -s 192.168.1.0/24 -p tcp -m tcp --dport 445 -j ACCEPT
To remove a rule, we’ll specify the same command, replacing -A with -D, for example:
sudo iptables -D INPUT -s 192.168.1.0/24 -p udp -m udp --dport 137 -j ACCEPT sudo iptables -D INPUT -s 192.168.1.0/24 -p udp -m udp --dport 138 -j ACCEPT sudo iptables -D INPUT -s 192.168.1.0/24 -p tcp -m tcp --dport 139 -j ACCEPT sudo iptables -D INPUT -s 192.168.1.0/24 -p tcp -m tcp --dport 445 -j ACCEPT
To view the list of rules, use the command:
sudo iptables -nvL
See also my articles:
Configuring IPTables
Installing and Configuring Samba on Linux
How to schedule shutdown Windows
There are several ways to schedule a Windows shutdown.
1) You can execute the command shown below in the “Run” window (it can also be opened with the WIN+R keys), also on the command line or the PowerShell, for all variants the command is the same:
shutdown –s –t 3600
Where 3600 is the number of seconds after which Windows will shut down and the computer will shut down.
3600 seconds = 1 hour.
Similarly, you can put the computer into hibernation mode if it is available:
shutdown –h –t 3600
To cancel a command, you must:
shutdown /a
2) The second way is to create a simple task in the task scheduler.
Open the Control Panel\System and Security\Administration\Task Scheduler.
Click “Create a simple task …”.
Enter any name for the new task, for example, “Shutdown.”
In the next window, select “Once.”
In the next window, we indicate the time when we need to complete the task.
In the next window, select “Run the program.”
In the line “Program or script:” we indicate the program:
C:\Windows\System32\shutdown.exe
and in the line “Add arguments (optional):” -s
Create a task.
Similarly, you can create a task such as sleep mode by entering “Program or script:” in the line:
C:\Windows\System32\rundll32.exe powrprof.dll,SetSuspendState Sleep
If you want to delete it, in the Task Scheduler window on the left click “Job Scheduler Library” and clicking the right button on the desired task, click “Delete”.
See also my article – Enable or disable Hibernate mode in Windows
Lenovo A3000 Hard Reset
On the test I will use Lenovo A3000-H.
Let’s get started. Turn off the tablet if it is possible, if not, we still press and hold the power key and the volume up key at the same time until the following menu appears:
Recovery Mode
Fastboot Mode
Normal Mode
Press the volume up key to select the desired mode, and go to the volume down key. In our case, let’s move on to Recovery Mode.
There was a robot, we put the power button on and another menu will appear. In it, on the contrary, by the sound reduction button we select the necessary operation, and the magnifications will be performed by it.
First we choose and execute “wipe cache partition“, later “wipe data/factory reset” and at the end we execute “reboot system now“, the device will reboot with standard settings and without user data.
Done.