ntamvl

[Linux] How can I know the absolute path of a running process

ps auxwe

or

ps -ef

ntamvl

low disk watermark [??%] exceeded on

I know it is old post, but my comment can make someone happy. In order to specify watermark in bytes values (gb or mb) you have to add cluster.routing.allocation.disk.watermark.flood_stage to your elasticsearch settings file - elasticsearch.yml. Complete example:

cluster.routing.allocation.disk.threshold_enabled: true 
cluster.routing.allocation.disk.watermark.flood_stage: 200mb
cluster.routing.allocation.disk.watermark.low: 500mb 
cluster.routing.allocation.disk.watermark.high: 300mb   

ntamvl

[ElasticSearch] How to turn red to Green or yellow status

PUT _settings
{
    "index" : {
        "number_of_replicas" : 0
    }
}

ntamvl

Fixed compile assets for React

bundle exec rails webpacker:binstubs

ntamvl

ActionCable: How to use dynamic channels

Pass a roomId on your subscription creation in javascripts/channels/room.js:

MakeMessageChannel = function(roomId) {
  // Create the new room channel subscription
  App.room = App.cable.subscriptions.create({
    channel: "RoomChannel",
    roomId: roomId
 }, {

ntamvl

Bash color

export PS1="\[\033[36m\]\u\[\033[m\]@\[\033[32m\]\h:\[\033[33;1m\]\w\[\033[m\]\$ "
export CLICOLOR=1
export LSCOLORS=ExFxBxDxCxegedabagacad
alias ls='ls -GFh'
alias ll='ls -al'

ntamvl

Fixed some errors when install amber on macOS

Install all required libraries for Crystal on macOS

xcode-select --install
brew install \
  bdw-gc \
  gmp \
  libevent \
 libxml2 \

ntamvl

NPM: How to Prevent Permissions Errors

This section does not apply to Microsoft Windows. This chapter will be updated to address Windows in the near future.

To minimize the chance of permissions errors, you can configure npm to use a different directory. In this example, it will be a hidden directory on your home folder.

Back-up your computer before you start.

Make a directory for global installations:

ntamvl

How to implement a “callback” in Ruby?

This "idiomatic block" is a very core part of everyday Ruby and is covered frequently in books and tutorials. The Ruby information section provides links to useful [online] learning resources.

The idiomatic way is to use a block:

def x(z)
  yield z   # perhaps used in conjunction with #block_given?
end
x(3) {|y| y*y} # => 9

ntamvl

Check status ethereum download

Create bash file check_status.sh with below content:

geth --exec 'var s = eth.syncing; console.log("\n------------ GETH SYNCING PROGRESS\nprogress: " + (s.currentBlock/s.highestBlock*100)+ " %\nblocks left to parse: "+ (s.highestBlock-s.currentBlock) + "\ncurrent Block: " + s.currentBlock + " of " + s.highestBlock)' attach http://127.0.0.1:8545

# source: https://ethereum.stackexchange.com/questions/394/how-can-i-find-out-what-the-highest-block-is

Remember change mode execute for this file: