Hi, Tips!

[hi-tips]

Use supervisor manage upstart things

Install & start:

sudo apt-get install supervisor sudo service supervisor status sudo service supervisor start

then edit /etc/supervisor/conf.d/your_service.conf, for example, I create a netdata config file:

[program:netdata] command = /usr/sbin/netdata autostart = true autorestart = true stdout_logfile = /var/log/supervisor/netdata.log stderr_logfile = /var/log/supervisor/netdata_err.log

then run

sudo supervisorctl reread sudo supervisorctl update

You may also want to check whether your scripts are running.

sudo supervisorctl # it fires up interactive mode > restart your_service > start your_service > stop your_service

[hi-tips]

NVM ls-remote N/A on EC2 Ubuntu

Install the missing ca-certificates package

sudo apt-get install ca-certificates

Then try again.

[hi-tips]

/usr/bin/ld: cannot find -lgmp while installing bson ruby gem on Ubuntu

Install the missing library:

sudo apt-get install libgmp3-dev

[hi-tips]

Hosting a mongo db instance on Google Cloud Platform

I just signed up Google Cloud Platform(GCP) and got $300 free usage. It's handy starting at cloud launcher mongo instance if you don't care about the price :p. The following is the installation checklist.

create a cloud computing resource

follow the official guide for installation mongo db

setup iptable rules

set bindIp to 0.0.0.0 in /etc/mongo.conf

allow tcp 27017 port in firewall rules

[hi-tips]

Allow public accessing local rails server for testing

I list two different ways below.

rails s --binding=0.0.0.0

localtunnel npm package

For the first method, simplely run up rails server by that command, then access via ip address with port 3000 by default. If you don't have a public ip address(only LAN address), you might need to configure your Router NAT to make port 3000 alow public access. The other way is using localtunnel npm package, install by

$ npm install localtunnel -g

then after running rails server command, run

$ lt --port 3000

The localtunnel will give you an unique url like https://gqgh.localtunnel.me. Now you can accessing your local server via this url.

[hi-tips]

Upgrade OS X git to 2.7.4

Due to the CVE-2016-2324, CVE-2016‑2315 (via https://ma.ttias.be/remote-code-execution-git-versions-client-server-2-7-1-cve-2016-2324-cve-2016-2315/), we should upgrade our git client immediatly to prevent remote code execution :p. In OS X, git comes with XCode Developer tool, but if we want to use the lastest git, it can be installed through Homebrew.

brew install git

and then run command

which git

You may find the path still in /usr/bin/git. Then edit your shell configuration file(~/.bash_profile or ~/.profile or even ~/.zshrc) to place /usr/local/bin/git before /usr/bin For example

export PATH="/usr/local/bin/git:$PATH"

start a new shell check git version by git --version Also remember to set SourceTree git to System provided.

[hi-tips]

git can’t commit with vim

After a clean install of vim bootstrap, my git can't commit with vim editor. Simply fix it by:

git config core.editor 'vim'

[hi-tips]

Css word break

Tips: Use both.

word-break: break-words; overflow-wrap: break-word;

for more read it here(CSS Tricks).

[hi-tips]

Use EventEmitter for calling child component event from parent in React

via http://stackoverflow.com/questions/31177366/react-native-call-function-of-child-from-navigatorios In parent component, writes

//in import package parts import EventEmitter from 'EventEmitter'; //in your Component class componentWillMount() = => { this.eventEmitter = new EventEmitter(); } handleAction() => { this.eventEmitter.emit('SomeEvent', { someArg: 'argValue' }); }

Then pass on this.eventEmitter as props to child component.

<ChildComponent event={this.eventEmitter} />

Finally add a listener for handling events in child component.

import Subscribable from 'Subscribable'; var ChildComponent = React.createClass({ mixins: [Subscribable.Mixin], componentDidMount() { this.addListenerOn(this.props.events, 'SomeEvent', this.myEventHandler); }, //other code goes here }

Note that ES6 style classes do not support mixins, so you must write your child component class in legacy "createClass" style.

[hi-tips]

Easily setup a packet monitoring environment on Mac with iPhone

Turn on personal hotspot on your iPhonet

Connect your iPhone with USB cable from Mac

Turn on Wifi Internet sharing on your Mac through iPhone USB network

Download Cocoa Packet Analyzer

Have fun monitoring :)

[hi-tips]

Testing request through local port listening with netcat (nc)

Run nc -l YOUR_PORT, for example:

nc -l 9000

and set your request endpoint to localhost:9000. via http://hilton.org.uk/blog/inspecting-http-requests

[hi-tips]

Restore some deleted file by git

Find the commit SHA when you deleted the file then checkout back to restore it.

git log --all -- <path-to-file> git checkout <SHA>^ -- /path/to/file

For more you can read from original post on stackoverflow. via http://stackoverflow.com/questions/7203515/how-to-locate-a-deleted-file-in-the-commit-history

[hi-tips]

Simple ActiveRecord filtering in controller

In Search and Filter Rails Models Without Bloating Your Controller this article, he described that you can filtering by multiple params like:

params.slice(:status, :location, :starts_with).each do |key, value| @products = @products.public_send(key, value) if value.present? end

Alternatively you can write:

YourModel.where(params.slice(*[your_filtering_params_array]))

[hi-tips]

There was a problem with the editor 'vi'. Not committing merge; use 'git commit' to complete the merge.

I encountered this problem someday after upgrading vim through homebrew maybe. I forgot :p. However this problem can be simply solved by:

git config --global core.editor /usr/bin/vim

via http://stackoverflow.com/questions/14607584/using-vim-for-git-commit-messages-broken-after-updating-janus

[hi-tips]

Save ActiveRecord model without validation

Simple:

model.save(validate: false)

[hi-tips]

Alfred theme reset after restarting on OS X El Capitan

http://www.alfredforum.com/topic/5197-restart-resets-alfred/page-2#entry40853

[hi-tips]

My simple way of setup rails production

With Paseenger & nginx.

Install passenger and nginx from APT source

Install ruby using rvm

Config nginx passenger path, ruby to rvm source, and root to project public folder

I use ruby gem to install passenger and nginx at first(gem install passenger then rvmsudo passenger-install-nginx-module), but only nginx works. Maybe the mix different tutorial leads to this problem. After I removed passenger & nginx and installed again from APT, it finally worked.