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UserParameter=memcached_stats[*],(echo stats; sleep 0.1) | telnet 127.0.0.1 $1 2>&1 | awk '/STAT $2 / {print $NF}' 

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Sample service script for debianoids

Look at LSB init scripts for more information.

Usage

Copy to /etc/init.d:

# replace "$YOUR_SERVICE_NAME" with your service's name (whenever it's not enough obvious)

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---
# This has been tested with ansible 1.3 with these commands:
#   ansible-playbook -i hosts ansible_conditionals_examples.yaml --extra-vars="hosts=myhosts isFirstRun=false"
#   ansible-playbook -i hosts ansible_conditionals_examples.yaml --extra-vars="hosts=myhosts isFirstRun=true"
#   ansible-playbook -i hosts ansible_conditionals_examples.yaml --extra-vars="hosts=myhosts"
# NB: The type of the variable is crucial!

- name: Ansible Conditionals Examples
  hosts: $hosts
  vars_files:

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High availability monitoring with Sensu

sensu | May 8, 2013

Redundancy. Availability. Scalability. Should sound familiar to you if you work in the web. Every system I build has to fit those 3 main criterias. I would also throw in manageability. If I can’t use Chef with it, I’m probably trying to use the wrong tool for the job.

There’s always been one exception though: my monitoring tool. Nagios. Zabbix. Zenoss. Shinken. Used them all. Each of them have shortcomings when it comes to the four criterias listed above. Different ones for each.

So, that said, a few months back, I was searching for something fresh. Something I could easily manage with Chef. Because I tend to forget things, and I wanted to automate as much as possible our monitoring solution. Don’t get me wrong, there’s nothing as good as developers to monitor your stuff, but I tend to like to know there’s something wrong before they show up at my desk. Even if it’s only 1-2 minutes ;)

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#!/bin/sh
### BEGIN INIT INFO
# Provides:          consul
# Required-Start:    $local_fs $remote_fs
# Required-Stop:     $local_fs $remote_fs
# Default-Start:     2 3 4 5
# Default-Stop:      S 0 1 6
# Short-Description: Consul service discovery framework
# Description:       Healthchecks local services and registers
#                    them in a central consul database.

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func main() {
	// Set logging output to standard console out
	log.SetOutput(os.Stdout)

	sigs := make(chan os.Signal, 1) // Create channel to receive OS signals
	stop := make(chan struct{})     // Create channel to receive stop signal

	signal.Notify(sigs, os.Interrupt, syscall.SIGTERM, syscall.SIGINT) // Register the sigs channel to receieve SIGTERM

	wg := &sync.WaitGroup{} // Goroutines can add themselves to this to be waited on so that they finish

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#!/usr/bin/env python
import json
from jinja2 import Template
# git clone https://github.com/pingcap/tidb-docker-compose
# cd tidb-docker-compose
# git clone https://github.com/tennix/grafonnet-lib -b table
# python dashboard-to-jsonnet.py > pd.jsonnet
# jsonnet -J grafonnet-lib pd.jsonnet > config/dashboards/generated-pd.json
with open('config/dashboards/pd.json', 'r') as f:
    data = json.load(f)