urjitbhatia

#!/bin/bash

# replace any with a specific interface you want to monitor or just use any to capture all interfaces
tcpdump -i any 'dst port 53' >> /var/log/dnsqueries.log

#### If using supervisord, use this template for setting up the program entry:
# [program:dnsworker]
# command=bash dnsquerylogger.sh
# autostart=true
# autorestart=true

urjitbhatia

# Command to run pt online schema change
pt-online-schema-change \
   D=<dbname>,t=<table_name>,h=<hostname>,u=<username> \
   --alter="<alter sql>" \
   --ask-pass \
   --execute \
   --max-load 100 \
   --critical-load 120

urjitbhatia

--- Simple table to keep track of delete chunks
create table _delete_log
(
    log       varchar(200) null,
    createdAt timestamp    null
);

------------ Stored proc definition ---------------
DROP PROCEDURE IF EXISTS delete_chunks;
DELIMITER $$

urjitbhatia

$(docker inspect my-sibling-dind-container --format '{{ .NetworkSettings.IPAddress }}')

-- Make sure both run on the same "network" (bridge by default in most cases)

urjitbhatia

### example for setting up a make workflow that can tag images based on the git tag
### the trailing ; are important: runs the commands in the same "shell" and the $$tag variable flows through

docker-build:
	@echo "Latest 3 tags: "; \
	git ls-remote --sort='v:refname' --tags ./. | tail -n 3; \
	read -p "Enter New Tag:" tag; \
	echo "Releasing new tag: $$tag"; \
	git tag $$tag; \
	git push origin $$tag -f; \

urjitbhatia

#!/usr/bin/env bash

###### ERROR TRAP - DONT WRITE OTHER COMMANDS BEFORE THIS  ############
set -eEx
function HANDLE_ERROR() {
  echo "SCRIPT FAILED"
  echo "FAILED AT: $(caller)"
  # Do any other commands here
  exit 1
}

urjitbhatia

# This script will send a signal to a container
# Sleep for a random time b/w 1 to 3 seconds to avoid restarting at the exact same time
# This bc format of finding random doesn't print scientific notation which sometimes sleep doesn't like a lot
/bin/sleep "$(echo "scale=3; 0.5 + 2.5 * $RANDOM / 32767" | bc)s"

## Running in silent curl mode (-s and > /dev/null) - remember while debugging
if curl --silent --show-error --output /dev/null --unix-socket /var/run/docker.sock -X POST "http/containers/${CONTAINER_ID}/kill?signal=SIGUSR2" ; then
    echo "Successfully sent signal to $CONTAINER_ID"
else
    echo "Failed to send signal to $CONTAINER_ID. Triggering alarms."

urjitbhatia

# https://help.datadoghq.com/hc/en-us/articles/206441345-Send-metrics-and-events-using-dogstatsd-and-the-shell

# Send an event to DD based on success or failure
echo "_e{${#title},${#text}}:$title|$text|t:${alert_type}"  | nc -u -w1 "${HOST_IP}" 8125

if [ "$CMD_EXIT_CODE" -eq 0 ];
    echo "foo.bar.success:1|g" | nc -u -w1 "${HOST_IP}" 8125
then
    echo "foo.bar.failure:1|g" | nc -u -w1 "${HOST_IP}" 8125
fi

urjitbhatia

#!/bin/bash

######################################################################
# Waits for Mongodb, Redis and Mysql to be ready
# usage examples:
#    wait-for-dependencies.sh echo "READY TO GO"
#    wait-for-dependencies.sh make build
# Exit Codes: 0 for success, 2 if wait command timed out
######################################################################

urjitbhatia

#!/bin/bash

set -e

export CONSUL_HTTP_ADDR="https://my-consul-address"
VALUE=$(consul kv get <key>)

if [ "$VALUE" != "locked" ]; then
  # Unlocked, check the timeout
  TIMEOUT=$(echo $VALUE | jq 'reduce .[] as $num (0; .+$num)')