Alex Simenduev shamil

## netmask_cidr.md

      
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                shamil
                / netmask_cidr.md
            
            
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              May 26, 2021 11:52
            
              
                Netmask / CIDR Translation Table
              
          
    Netmask / CIDR Translation Table
Netmask             Binary                              CIDR    Notes
---------------------------------------------------------------------------
255.255.255.255     11111111.11111111.11111111.11111111 /32     1   useable
255.255.255.254     11111111.11111111.11111111.11111110 /31     0   useable
255.255.255.252     11111111.11111111.11111111.11111100 /30     2   useable
255.255.255.248     11111111.11111111.11111111.11111000 /29     6   useable
255.255.255.240     11111111.11111111.11111111.11110000 /28     14  useable

255.255.255.224 11111111.11111111.11111111.11100000 /27 30 useable

  
## net_listen.sh
# find all listening ports
cat /proc/net/tcp  | awk '$4 == "0A" {print $2}' | awk -F: '{print strtonum("0x"$2)}'

# find all listening ports and print their inodes as well
cat /proc/net/tcp  | awk '$4 == "0A" {print $10" "$2}' | tr : ' ' | awk '{printf "%d %d\n", strtonum("0x"$3), $1}'

# find all socket for PID and print their inodes
find -L /proc/<PID>/fd -type s -printf "%i\n"

# find listening ports for by PID

## setup_gosublime.md

      
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                shamil
                / setup_gosublime.md
            
            
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              February 5, 2016 22:17
            
          
    Using Sublime Text for Go Development


Credits goes to Mark Wolfe.

If you're new to golang then before you start setup your workspace, firstly watch this video Writing, building, installing, and testing Go code.
Usually after installing go, I'm running the following commands to make GOPATH available for my user
mkdir -p ~/Documents/My/gocode/src/github.com/shamil

  
## zabbix_email_template.md

      
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                shamil
                / zabbix_email_template.md
            
            
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              August 29, 2015 14:27
            
          
    This is what I use in Zabbix email action
Subject (problem):
{TRIGGER.SEVERITY}/{HOST.NAME}: {ITEM.NAME}

Subject (recovery):
OK/{HOST.NAME}: {ITEM.NAME}


## gdb_stacktrace.md

      
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                shamil
                / gdb_stacktrace.md
            
            
              Created
              August 27, 2015 11:10
            
              
                Viewing stacktrace of running process using GDB
              
          
    Viewing stacktrace of running process using GDB
to view stacktrace of running process, run
sudo gdb -batch -quiet -nx -ex "backtrace full" -p <PID>

to view stacktrace of running process for all threads, run
sudo gdb -batch -quiet -nx -ex "thread apply all backtrace full" -p

  
## gcr-tags.go
package main

import (
	"encoding/base64"
	"encoding/json"
	"flag"
	"fmt"
	"net/url"
	"os"
	"os/user"

## read-access.sql
-- PostgreSQL, create read-only user
-- Option 1

-- Create a group
CREATE ROLE readaccess;

-- Grant access to existing tables
GRANT USAGE ON SCHEMA public TO readaccess;
GRANT SELECT ON ALL TABLES IN SCHEMA public TO readaccess;

## setup-franz-ubuntu.sh
#!/bin/bash

sudo rm -fr /opt/franz
sudo rm -fr /usr/share/applications/franz.desktop


# create installation dir
sudo mkdir -p /opt/franz

#install franz

## tftp_fedora.md

      
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                shamil
                / tftp_fedora.md
            
            
              Created
              February 24, 2017 21:37
            
              
                TFTP server on Fedora
              
          
    Source
TFTP server on Fedora

Here are some quick notes on setting up a TFTP server on Fedora 23. This is used, for example, to send Linux kernel images and other binaries to a bootloader on an embedded system.
First, install the packages:
sudo dnf install -y tftp tftp-server

  
## reroute.py
#!/usr/bin/env python3
#
# An example python script to reroute unassigned shards to NODE_NAME node,
# thus recovering from the red cluster status
#

# pip install requests before using requests
import requests
import json
	# find all listening ports
	cat /proc/net/tcp \| awk '$4 == "0A" {print $2}' \| awk -F: '{print strtonum("0x"$2)}'

	# find all listening ports and print their inodes as well
	cat /proc/net/tcp \| awk '$4 == "0A" {print $10" "$2}' \| tr : ' ' \| awk '{printf "%d %d\n", strtonum("0x"$3), $1}'

	# find all socket for PID and print their inodes
	find -L /proc/<PID>/fd -type s -printf "%i\n"

	# find listening ports for by PID
	package main

	import (
	"encoding/base64"
	"encoding/json"
	"flag"
	"fmt"
	"net/url"
	"os"
	"os/user"
	-- PostgreSQL, create read-only user
	-- Option 1

	-- Create a group
	CREATE ROLE readaccess;

	-- Grant access to existing tables
	GRANT USAGE ON SCHEMA public TO readaccess;
	GRANT SELECT ON ALL TABLES IN SCHEMA public TO readaccess;
	#!/bin/bash

	sudo rm -fr /opt/franz
	sudo rm -fr /usr/share/applications/franz.desktop


	# create installation dir
	sudo mkdir -p /opt/franz

	#install franz
	#!/usr/bin/env python3
	#
	# An example python script to reroute unassigned shards to NODE_NAME node,
	# thus recovering from the red cluster status
	#

	# pip install requests before using requests
	import requests
	import json