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justenwalker / README.md
Created August 30, 2014 18:03
Ansible Dynamic Inventory script for etcd

etcd dynamic inventory script

Generarates inventory for ansible from etcd using python-etcd library.

The script assumes etcd.ini to be present alongside it. To choose a different path, set the ETCD_INI_PATH environment variable:

export ETCD_INI_PATH=/path/to/etcd.ini
@justenwalker
justenwalker / direnv_prune.sh
Last active October 3, 2022 13:11
Direnv Prune Allow List
# removes direnv allow entries which point to nonexistent .envrc files
# or where the hash of the envrc does not match
direnv_prune () {
for entry in ~/.local/share/direnv/allow/*
do
local file=$(cat $entry)
if [ ! -f $file ]
then
rm $entry
else
@justenwalker
justenwalker / gpg-gen.sh
Last active October 21, 2021 19:22
Generate ECC GPG Key
#!/bin/bash
# Usage: gpg-gen.sh
#
# Generates a new ECC GPG Key with a random passphrase
# It will output the resulting keys to ~/gpg-keys/
# You should save these somewhere safe like 1Password
set -euo pipefail
PRIMARY_KEY_EXPIRATION=3y
@justenwalker
justenwalker / call-windows.go
Last active October 8, 2021 22:58
Calling Windows API from Go
package win32
import "syscall"
import "unsafe"
var (
kernel32DLL = syscall.NewLazyDLL("kernel32.dll")
procCreateJobObjectA = kernel32DLL.NewProc("CreateJobObjectA")
)
@justenwalker
justenwalker / get_extended_tcp_table_windows.go
Last active June 20, 2021 16:14
Call Windows API for GetExtendedTcpTable and return a Byte Buffer containing the result.
package win32
import (
"syscall"
"unsafe"
)
var (
iphlpapiDLL = syscall.NewLazyDLL("iphlpapi.dll")
procGetExtendedTcpTable = iphlpapiDLL.NewProc("GetExtendedTcpTable")
@justenwalker
justenwalker / unsafeAssassinateEndpoint.md
Created January 9, 2014 17:33
Cassandra unsafe assassinate - removing a dead node from the cluster

Unsafe Node Assassinate

On Cassandra 1.1.x, nodetool removetoken on a dead node hangs. The only way to reliably remove the node from the cluster is to use an undocumented JMX command to force the remove of the node from gossip.

Upgrading to 1.2.x and above should obviate these steps in favor of nodetool removenode - See 1.2 Docs

It's probably also a good idea to run a nodetool repair after this operation - See wiki

Prerequisites

@justenwalker
justenwalker / string_convert_windows.go
Last active July 31, 2020 02:49
Convert Go strings to C-compatible strings for Windows API Calls
package win32
import "unicode/utf16"
// StringToCharPtr converts a Go string into pointer to a null-terminated cstring.
// This assumes the go string is already ANSI encoded.
func StringToCharPtr(str string) *uint8 {
chars := append([]byte(str), 0) // null terminated
return &chars[0]
}
@justenwalker
justenwalker / boxstarter.ps1
Last active November 1, 2019 03:32
Boxstarter Script
# Based off https://gist.github.com/jessfraz/7c319b046daa101a4aaef937a20ff41f
$gistContent = "https://gist.githubusercontent.com/justenwalker/25211c0fa10ddd705a3f6077e2b7694c"
#--- Function Library ---#
# New-RegistryKey creates the specified registry key if it does not exist
# It will recursively create any parent keys
function New-RegistryKey
{
@justenwalker
justenwalker / raw_tcp_table_iterate_windows.go
Last active January 10, 2019 03:57
Iterate through each array entry using unsafe.Pointer arithmetic
rows := make([]_MIB_TCPROW_OWNER_PID,int(pTable.dwNumEntries))
for i := 0; i < int(pTable.dwNumEntries); i++ {
rows[i] = *(*_MIB_TCPROW_OWNER_PID)(unsafe.Pointer(
uintptr(unsafe.Pointer(&pTable.table[0])) +
uintptr(i) * unsafe.Sizeof(pTable.table[0])
))
}
@justenwalker
justenwalker / damon-metrics-config-example.hcl
Last active November 8, 2018 21:42
Damon prometheus metrics example
# Ask for a port on which Damon can serve Prometheus metrics
network {
port "damon" {}
}
# Advertise damon as a service
service {
port = "damon"
name = "${NOMAD_TASK_NAME}-damon"
}