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public class Monitors {

    public static native void startProfiling(Object monitor);
    public static native void stopProfiling();
    public static native long getBlockTime();
    public static native long getBlockCount();

    static {
        System.loadLibrary("monitors");
    }

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To achieve this you can setup DNS Proxy Mode using the host's resolver with the following command: VBoxManage modifyvm "VM name" --natdnshostresolver1 on

As the result, guest OS DNS requests will be intercepted and resolved using host DNS API, rather than having guest OS connect to external DNS servers as with --netdnsproxy1 on.

You can get the name of the VM by running VBoxManage list runningvms.

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while true ; do  echo -e "HTTP/1.1 200 OK\nContent-Length: 1\n\n $(date)" | nc -l -p 7777  ; done


# watch alternative for macos
while :;
  do
  clear
  date
  netstat -nat | grep ::1.8080 | sort -k3
  sleep 1

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HTTP Headers

tcpdump -A -s 10240 'tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)' | egrep --line-buffered "^........(GET |HTTP\/|POST |HEAD )|^[A-Za-z0-9-]+: " | sed -r 's/^........(GET |HTTP\/|POST |HEAD )/\n\1/g'

HTTP Headers and body, on a given interface to a certain dst

tcpdump -i ens4 -A -s 10240 'dst 172.21.43.252 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)'

Postgres Queries

sudo tcpdump -i lo -s0 -nl -w- dst port postgres | strings -n8

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/*
 * ====================================================================
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *

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/***********************************************************
TSQL to do a quick and dirty look at single-use plans in 
the execution plan cache of a SQL Server. 
************************************************************/

/* Size of single use adhoc plans in execution plan cache */
SELECT 
    objtype, 
    cacheobjtype, 
    SUM(size_in_bytes)/1024./1024. as [MB] 

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Object Query Language (OQL)

$ java -version
java version "1.8.0_20"
Java(TM) SE Runtime Environment (build 1.8.0_20-b26)
Java HotSpot(TM) 64-Bit Server VM (build 25.20-b23, mixed mode)

OQL is SQL-like query language to query Java heap. OQL allows to filter/select information wanted from Java heap. While pre-defined queries such as "show all instances of class X" are already supported by HAT, OQL adds more flexibility. OQL is based on JavaScript expression language.

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-- From this article:  https://logicalread.com/troubleshoot-high-cpu-sql-server-pd01/#.WW_hjtPytuY
-- Show CPU Utilization by SQL Server, system idle time and other processes
DECLARE @ms_ticks_now BIGINT

SELECT @ms_ticks_now = ms_ticks
FROM sys.dm_os_sys_info;

SELECT TOP 15 record_id
	,dateadd(ms, - 1 * (@ms_ticks_now - [timestamp]), GetDate()) AS EventTime
	,SQLProcessUtilizationPercent

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#!/bin/bash

readonly SCRIPT_NAME=$(basename $0)

log() {
  logger -p user.notice -t $SCRIPT_NAME "$@"
}

err() {
  logger -p user.error -t $SCRIPT_NAME "$@"

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Carbon / Graphite tip: How to use whisper-resize to change xFilesFactor on existing stats

Detailed Steps

1.) Update /etc/carbon/storage-aggregation.conf to use the new xFilesFactor setting for new stats, if you haven't yet already

2.) Get the retention ranges as defined in storage-schemas.conf

fgrep retentions /etc/carbon/storage-schemas.conf | tr ',' ' '