| - What do Etcd, Consul, and Zookeeper do? | |
| - Service Registration: | |
| - Host, port number, and sometimes authentication credentials, protocols, versions | |
| numbers, and/or environment details. | |
| - Service Discovery: | |
| - Ability for client application to query the central registry to learn of service location. | |
| - Consistent and durable general-purpose K/V store across distributed system. | |
| - Some solutions support this better than others. | |
| - Based on Paxos or some derivative (i.e. Raft) algorithm to quickly converge to a consistent state. | |
| - Centralized locking can be based on this K/V store. |
| # Idempotent way to build a /etc/hosts file with Ansible using your Ansible hosts inventory for a source. | |
| # Will include all hosts the playbook is run on. | |
| # Inspired from http://xmeblog.blogspot.com/2013/06/ansible-dynamicaly-update-etchosts.html | |
| - name: "Build hosts file" | |
| lineinfile: dest=/etc/hosts regexp='.*{{ item }}$' line="{{ hostvars[item].ansible_default_ipv4.address }} {{item}}" state=present | |
| when: hostvars[item].ansible_default_ipv4.address is defined | |
| with_items: groups['all'] |
This simple script will take a picture of a whiteboard and use parts of the ImageMagick library with sane defaults to clean it up tremendously.
The script is here:
#!/bin/bash
convert "$1" -morphology Convolve DoG:15,100,0 -negate -normalize -blur 0x1 -channel RBG -level 60%,91%,0.1 "$2"
| --- | |
| # 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: |
-- Firstly, remove PRIMARY KEY attribute of former PRIMARY KEY
ALTER TABLE <table_name> DROP CONSTRAINT <table_name>_pkey;-- Then change column name of your PRIMARY KEY and PRIMARY KEY candidates properly.
ALTER TABLE <table_name> RENAME COLUMN <primary_key_candidate> TO id;
Now located at https://github.com/JeffPaine/beautiful_idiomatic_python.
Github gists don't support Pull Requests or any notifications, which made it impossible for me to maintain this (surprisingly popular) gist with fixes, respond to comments and so on. In the interest of maintaining the quality of this resource for others, I've moved it to a proper repo. Cheers!
Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.
$ python -m SimpleHTTPServer 8000
| // Bad method, don't use it. | |
| var a = [0,1,2,3,4] | |
| for (var i = 0; i < a.length; i++) { | |
| console.log(i, a[i]); | |
| if (a[i] === 0) { | |
| console.log(a); | |
| a.splice(i, 1); | |
| console.log(a); | |
| } | |
| } |
| data:text/html, <style type="text/css">.e{position:absolute;top:0;right:0;bottom:0;left:0;}</style><div class="e" id="editor"></div><script src="http://d1n0x3qji82z53.cloudfront.net/src-min-noconflict/ace.js" type="text/javascript" charset="utf-8"></script><script>var e=ace.edit("editor");e.setTheme("ace/theme/monokai");e.getSession().setMode("ace/mode/ruby");</script> | |
| <!-- | |
| For other language: Instead of `ace/mode/ruby`, Use | |
| Markdown -> `ace/mode/markdown` | |
| Python -> `ace/mode/python` | |
| C/C++ -> `ace/mode/c_cpp` | |
| Javscript -> `ace/mode/javascript` | |
| Java -> `ace/mode/java` | |
| Scala- -> `ace/mode/scala` |
| #!/usr/bin/python | |
| import os | |
| import sys | |
| import argparse | |
| import iso8601 | |
| import re | |
| import subprocess | |
| import logging | |
| import json |