people:drbohlav [Starlab knowledge base]

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===========Link===========

link k dvoufazaci
https://support.google.com/accounts/answer/185839?visit_id=1-636435045103056073-219194462&rd=1&hl=en

admin console gmail 
https://support.google.com/a/answer/175197?hl=en

tiskarna
přimo driver: http://ftp.hp.com/pub/softlib/software13/printers/COL71135/LJM129-M134_UWWL_4-1_UWWL_4_1_Basicx64_44.1.2550.exe

https://support.hp.com/us-en/drivers/selfservice/hp-laserjet-pro-mfp-m130-series/9365370/model/9365374


===========Linux commands===========
Vim:
	O – insert "above"
	ESC :wq – write (save) + quit
	i – insert – insert at place where I am 
	:q – quit – when no changes
	h j k l – move pointer left down up right
	arrow buttons - also moving of pointer

SSH:
       check public key:  cat ~/.ssh/id_rsa.pub
       .ssh/config - configure nicknames of ssh keys
       vi .ssh/config - edit config
       host <name>
              hostname 10.0.?.???
              user <user>
              
 dd command    
       dd if=/dev/zero/ of=/dev/sdb bs=1M count=100
       -rewrite (erase) usb stick with zeroes
       dd if=/home/nfs/drbohlav/Downloads/ubuntu-gnome-17.04-desktop-amd64.iso of=/dev/sdb bs=1M
       -move - create image on usb stick

dmesg command
       check how usb stick is mounted
       dmesg -T

wget command
       wget <path> → download requested file from http://... address

find command
      find <path> -name <name of searched file> -> looking for file by its name
      find <path> -ctime xx   → looking for files last edited xx days ago 
			-type x 	→ type x 
				d	→ directory
				f 	→ regular file
			-atime xx	→ accesed more then xx days ago
			-size x yy	→ size x-type yy- amount:
				c	→ bytes
				w	→ two bytes words
				k	→ Kilobytes
				M	→ Megabytes
				G 	→ Gigabytes

stat command 
 		%x     		→Time of last access, human-readable
		%y     		→Time of last modification, human-readable
 		%z    		→Time of last change, human-readable

tar xzf command 

ctr leftmouse -> option for CLI 

alt leftmouse -> move CLI window

alt rightmouse -> resize CLI window


ping nebo host - zjisti server na kterem je dana adresa
===========FTP===========
jak se pripojit pres midnight commander F9 vyprat pripojit pres FTP a spravne okno 
pak napr. user@novyweb.starlab.cz


===========STP===========
stp protocol video - https://www.youtube.com/watch?v=japdEY1UKe4 notes from video:
	- ccna exam big toppic
	- stric set of rules 
types of STP
	STP / 802.1D Original STP
	PVST+ Cisco improvement of STP adding a per VLAN feature
	RSTP / 802.1w Improved STP with much faster convergence
	Rapid PVST+ Cisco improvement of RSTP adding per VLAN  feature
	
	vlan + STP can make more efficient network. 

What accually is STP? 
	Feature used to prevent loops with redundand switches. 
	
broadcast messeges are sented all the time, if there is a loop it can make “brodcast storm” > bigger and bigger until on of the swiches fail, or someone breaks the link by discconecting or or reloading the switch
another problem is that the swich gets same broadcast messeges to different ports with same MAC adress, so its contiunously changes MAC adress tables. > unstable MAC adress tables

another problem are Duplicate frames - 

solution?
On of the connection is block, to broadcast messeges not goes multiple ways. It works, but how to chose which link to block? 
STP has a protocol for that
- high level overview:
	1. Elect a Root Bridge
	2. Place root interfaces into Fowarding state
	3. Each non-root switch seletcts its Root Port
	4. Remaining links choose a Designated Port
	5. All other ports are put in to a Blocking state

Roles – job of the ports
	Root Ports – The best port to reach the Root Bridge
	Designated Port – port with the best cost (route) to the Root Bridge on a link
	Non-Designated Port – All other ports that are in a blocking state

States
 	Disabled – A port that is shutdown
	Blocking – A port that is blocking traffic
	Listening – Not forwarding traffic and not learning MAC addresses
	Learning – Not forwarding traffic but learning MAC addresses
	Forwarding – Sending and receiving traffic like norma (FWD)

a) root bridge ellection
	each bridge BPDU
	Root cost
	stp priority: 32768 + vlan number
	example of BPDU:
	Root cost: 0
	My BID : 32769aaaa:aaaa:aaaa
	Root BID : 32769aaaa:aaaa:aaaa
	
	best BPDU wins ellections

b) then root bridge is changed to FWD state
c) other switches choosing best path to the root bridge – these are called root ports (RP)
 -selection is based on port cost 
	
	Port Cost
        Port Speed        Orginal     New
        10 Mbps            100          2,000,000
        100 Mbps          19	        200,000
        1Gbps               4	        20,000
        10 Gbps            2	        2,000
        100 Gbps          N/A	        200
        1 Tbps              N/A	        20

- root cost is the collection of each outgoing port added together to the root
	- root port chossing is logicaly based on lowest port cost
I. root cost to the bridge
II. root cost coud be the same on more ports
	- lowes neigbour BID wins
- if they ties >
III. Lowest neighbour port priority

IV. Lowest neighbour port number
d) designated ports (DP)
ports that are not root ports, choosing designated ports
Cisco packet tracer
I. lowest root cost to the bridge
	if that ties> 
II. lowest bid
 	>
III. Lowest neigbour port priority
IV. Lowest neighbour port number

e) blocking
last step – every port, that is not a root port, or a designated port, is put to blocking state 



Timers – Default
	Hello 2 Seconds
	Max Age 10 x Hello (20 seconds)
	Forward Delay 15 Seconds

STP States
	forwarding State – Moves straight to blocking
	Blocking State Moves straight to Listening
	Listenning – Foward Delay timer (Default 15 Seconds)
	Learning – Foward Delay timer (Default 15 Seconds)


===========switches===========
? <enter> → kontext help 
switch>  → user mode
enable (to enable mode) → switch# → priviliged mode
disable (to go back to user mode)

ping ???.???.???.??? → ping IP adress

configure terminal → global configure mode

show running-config

show ip interface brief = sh ip int brief

show vlan brief


write → save settings 

copy run start → save settings

Switch(config)#interface fa 0/2

switchport access vlan 4

two  config files - running-config and startup if I do write command both are the same
copy running-config tftp → backup configuration on server
adress

change vlan ip adress
     interface vlan 50
     ip adress ???.???.???.???. 255.255.255.???
     
add port to vlan
     (config)# interface fastEthernet 0/2
     (config-if)# switchport mode access
     (config-if)# switchport access vlan 50
     (config-if)# no shutdown
     
vypnout trunk na portu:
     (config-if)#no switchport trunk native vlan 4
      
how to enable and disable bpdu guard
     spanning-tree bpduguard → enable
     no spanning-tree bpduguard → disable

   
===========Python Django===========

create virtuale environment

     virtualenv - p python3 <name>
     
     source bin/activate
     pip install django  -> To install Django  into virtual evironment
     
     django-admin startproject <name> -> to create django project
     
     ./manage.py runserver -> show information - ip adress

     migration - makemigrations
     ./manage.py migrate
     
     create superuser for database - ./manage.py createsuperuser

     
 
urls.py -> pridani stranky k souboru


<code>
   Function views
    1. Add an import:  from my_app import views
    2. Add a URL to urlpatterns:  url(r'^$', views.home, name='home') 

from . import views

    urlpatterns = [
    url(r'^admin/', admin.site.urls),
    url(r'^prehled/', views.prehled, name='prehled'),


     
    urlpatterns = [
    url(r'^admin/', admin.site.urls),
    url(r'^prehled/', views.prehled, name='prehled'),
</code>

views.py ->

<code>
from django.http import HttpResponse

def prehled(request):
        return HttpResponse("Zde bude prehled nahravek jiz v databazi")

</code>

python manage.py shell -> run django python shell 



===========Pycharm===========

/srv/pycharm-2016.2.3/bin/pycharm.sh -> run pycharm

===========Telefonovani, presmerovani, linky===========

jak presmerovat hovor

     zvednu sluchatko - muzu mluvit s volajicim
     pro presmerovani zmacknu xfer 
     zdam cislo xx nebo zkratku napr 28 zmacknu dial 
     mohu mluvit s tim na koho presmerovavam pokud to zvedne
     pak znovu xfer 
     
     28 - KM
     21 - VS
     22 - DS
     25 - MaDr


===========Jak zkopirovat databazy ze stareho serveru na novy===========

informace o starych databazich v http://212.20.98.92/ispconfig/ heslo v ratticu. 
sites> databasis (nalevo) > nahore filtrovat napr pomoci vybrani klienta

STAHNOUT
-jit na http://webhost.panelnet.cz/phpmyadmin/  - prihlasit se jako root - obvykle heslo > vybrat databazy vlevo > pak kliknout na export > zpravidla nechat tak jak je (Quick, SQL) > a pak kliknout na GO
-stahne se soubor s databazi

NAHRAT
-jit na https://webhosting.starlab.cz/  > login > prihlasit se jako uziv > kliknout na users v pravo dole > vybrat uzivatele pro ktereho chci databazi nahrat a login as user > site list (v levo nahore) > website name - vybrat > pak kliknout na databases (v levo dole) > add database > napsat jmeno stejneho formatu jako stazena databaze a zakliknout MySQL

pak prihlasit na https://webhosting.starlab.cz/phpmyadmin jako root - obvykle heslo > vybrat nove vytvorenou databazy vlevo > nahore import > chose file - vybrat stazenou databazi > click GO 
databaze by se mela nahrat bez chyb.
people/drbohlav.txt · Last modified: 2018/04/18 12:04 by drbohlav