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@jeffrade
jeffrade / update_on_ip_change.sh
Last active Mar 5, 2020
Bash script that checks for IP change and updates Route53
View update_on_ip_change.sh
#!/bin/bash
# Usage: Launch in the background and pass RECORD_SET_NAME (e.g. sub.example.com.)
# as a first argument for the Route53 record. Log file can be found at /var/tmp/r53-record.log
NOTIFY_DIR=/var/tmp
LOG_FILE=${NOTIFY_DIR}/r53-record.log
CURR_IP_FILE=${NOTIFY_DIR}/ip.out
TMP_IP_FILE=${NOTIFY_DIR}/ip.tmp
IP_LKP_URL=https://ifconfig.me/ip
RECORD_SET_FILE=${NOTIFY_DIR}/r53-record-set.json
@jeffrade
jeffrade / install_kafka.sh
Created Sep 11, 2019
Install Kafka on CentOS 7
View install_kafka.sh
#!/bin/bash
echo "Starting..."
cd ~/
wget https://download.java.net/java/GA/jdk12.0.1/69cfe15208a647278a19ef0990eea691/12/GPL/openjdk-12.0.1_linux-x64_bin.tar.gz
tar -xzvf openjdk-12.0.1_linux-x64_bin.tar.gz
echo "PATH=$PATH:$HOME/jdk-12.0.1/bin" >> ~/.bash_profile
echo "export PATH" >> ~/.bash_profile
echo "export JAVA_HOME=$HOME/jdk-12.0.1" >> ~/.bash_profile
@jeffrade
jeffrade / bitcoind-start.sh
Created Jul 13, 2019
bitcoind systemd service and start script.
View bitcoind-start.sh
#!/bin/bash
# Just a simple wrapper to start bitcoind.
#
# If using systemd, simply create a file (e.g. /etc/systemd/system/bitcoind.service)
# from example file below and add this script in ExecStart.
# https://raw.githubusercontent.com-/bitcoin/bitcoin/76deb30550b2492f9c8d9f0302da32025166e0c5/contrib/init/bitcoind.service
#
# Then run following to always start:
# systemctl enable bitcoind
@jeffrade
jeffrade / BitcoinCoreFullNode.md
Last active Feb 6, 2020
Running a Bitcoin Core Full Node - Additional Installation Notes
View BitcoinCoreFullNode.md

Addtional Setup and Installation Notes for Running a Full Node (Linux)

  • Install fail2ban
  • (Optional) Block data is getting larger (although at a slower pace), so you might be mounting an external drive to .bitcoin dir. If so follow these steps:
   # You want this to auto mount on reboot (or else you'll have to manually mount every time):
 - `sudo blkid` # Make note of the UUID of your drive
 - `sudo vim /etc/fstab` # Append additional entry and your mount directory (easy to default to `$HOME/.bitcoin`)
    e.g. `UUID=<hexadecimal-dashed-uuid> /home/<your-user-name>/.bitcoin/ ext4 defaults 0 0` 
 - `sudo mount -a` # Test this, you'll get errors if any
@jeffrade
jeffrade / fail2ban_install.sh
Created Jun 30, 2019
Install fail2ban on Debian Linux
View fail2ban_install.sh
#!/bin/sh -x
echo "Starting..."
apt-get install -y fail2ban
systemctl start fail2ban
systemctl enable fail2ban
> /etc/fail2ban/jail.local
@jeffrade
jeffrade / list_fun.ex
Created Jun 24, 2019
Tail recursive implementaion of doubling every other number in a list.
View list_fun.ex
defmodule ListFun do
def double_every_other([], acc), do: acc
def double_every_other([head | nil], acc) do
new_acc = [head * 2 | acc]
double_every_other([], new_acc)
end
def double_every_other([head | tail], acc) when length(tail) == 0 do
@jeffrade
jeffrade / recursion.ex
Created Jun 11, 2019
Tail recursion is optimized way to do recursion in Elixir
View recursion.ex
defmodule Recursion do
@moduledoc """
Showing how tail recursion is optimized way to do recursion (i.e. no memory loss since function calls not kept on stack).
"""
def correct_tail_recursion_adding([head | tail], accumalator) do
correct_tail_recursion_adding(tail, accumalator + head)
end
def correct_tail_recursion_adding([], accumulator) do
@jeffrade
jeffrade / process_params.sh
Last active Feb 19, 2019
Bash script that will pop a line item for a file and pass it to a command.
View process_params.sh
#!/bin/bash
echo "Starting..."
param=`sed -e 1$'{w/dev/stdout\n;d}' -i~ params.out`
while [[ -n $param ]]; do
echo "Starting process for $param..."
<some-command> $param &
curr_pid=`echo $!`
@jeffrade
jeffrade / process_queue.sh
Last active Feb 3, 2019
Bash Script (infinite loop) to Upload Files to AWS S3 Glacier
View process_queue.sh
#!/bin/bash
QUEUE_DIR="./queue"
COMPLETED_DIR="./completed"
S3_BUCKET_NAME="<YOUR_BUCKET_NAME_HERE>"
OLDEST_FILENAME=""
echo "Running..."
while :; do
echo "Finding oldest file..."
@jeffrade
jeffrade / openssl.x509.sh
Last active Sep 11, 2019
Bash script to check certificate information - uses openssl.
View openssl.x509.sh
#!/bin/sh
if [ -z "$1" ]
then
echo "Please supply a domain, e.g. www.example.com"
exit 1
fi
echo | openssl s_client -servername $1 -connect $1:443 2>/dev/null | openssl x509 -text
echo "Saving public ./cert.pem..."
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