zsh, oh-my-zsh and powerlevel9k

Cli

installation

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# zsh
brew install zsh zsh-completions
chsh -s $(which zsh)

# oh-my-zsh
git clone https://github.com/robbyrussell/oh-my-zsh.git ~/.oh-my-zsh

# powerlevel9k
git clone https://github.com/bhilburn/powerlevel9k.git ~/.oh-my-zsh/custom/themes/powerlevel9k
echo 'ZSH_THEME="powerlevel9k/powerlevel9k"' >>  ~/.zshrc

edit ~/.zshrc

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export ZSH=$HOME/.oh-my-zsh
ZSH_THEME="powerlevel9k/powerlevel9k"
plugins=(git)
source $ZSH/oh-my-zsh.sh
source /usr/local/share/zsh-history-substring-search/zsh-history-substring-search.zsh

POWERLEVEL9K_COMMAND_EXECUTION_TIME_THRESHOLD=0
POWERLEVEL9K_COMMAND_EXECUTION_TIME_PRECISION=2
POWERLEVEL9K_RIGHT_PROMPT_ELEMENTS=(status command_execution_time time)

useful plugin

reference

https://github.com/robbyrussell/oh-my-zsh/wiki/Installing-ZSH
https://github.com/robbyrussell/oh-my-zsh
https://github.com/bhilburn/powerlevel9k/wiki/Install-Instructions

UTF-8 Multibyte String Encoding

Decode in php

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# Hexadecimal
#
# utf-8 (ASCII)
# \x2a
#
# utf-8 (2-byte)
# \xC3\xa9
#
# utf-8 (3-byte)
# \xe5\x8f\x82
#
# utf-8 (4-byte)
# \xF0\x9F\x98\x81
#



# decode in php
$str = "\xe5\x8f\x82";
echo mb_convert_encoding($str, 'utf-8');
# output: 参
echo mb_convert_encoding($str, mb_detect_encoding($str));




# Decimal
#
# \ud83d\ude01
#
# decode in php
$str = "\ud83d\ude01";
echo json_decode('"' . '\ud83d\ude01' . '"');
# output: [smile]




# HTML Entities encoding and UTF-16
# 
# ¼
# \x10\x00
#
# decode in php
echo mb_convert_encoding('¼', 'UTF-8', 'HTML-ENTITIES');
# output: ¼
echo mb_convert_encoding("\x10\x00", 'UTF-8', 'UTF-16BE');
# output: က
.

Reference

https://stackoverflow.com/questions/6058394/unicode-character-in-php-string

IT automation 2 - Ansible Playbook

Ansible

Quick start

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apt-get install ansible

# docker pip and docker role
ansible-galaxy install geerlingguy.pip geerlingguy.docker

# create and run a playbook
vim docker.playbook.yaml
ansible-playbook docker.playbook.yaml

Sample playbook yaml - install pip and docker, docker-compose

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- hosts: all
  vars:
    pip_install_packages:
      - name: docker
  roles:
    - geerlingguy.pip
    - geerlingguy.docker

Reference

https://galaxy.ansible.com/geerlingguy/docker
https://galaxy.ansible.com/docs/

IT automation - Ansible

Ansible

Requirement

Quick start

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apt-get install ansible
ansible localhost -m ping

Run task at remote host

  • setup password-less ssh connection
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    # add remote servers
    echo "[webservers]" >> /etc/ansible/hosts
    echo "www[01:50].example.com" >> /etc/ansible/hosts
    # test remoteservers
    ansible remoteservers -a "/bin/echo hello"

Other usage

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# run as python2
ansible localhost -m ping -e 'ansible_python_interpreter="/usr/bin/env python"'
# run as python3
ansible localhost -m ping -e 'ansible_python_interpreter="/usr/bin/env python3"'

# run apt install screen
ansible 172.17.0.3 -m apt -a "name=screen"

# run `uptime`
ansible client -m shell -a "uptime"

Reference

https://docs.ansible.com/ansible/latest/user_guide/intro_inventory.html

Cusomte a PHP docker image

Php

Dockerfile

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FROM php:7-apache

RUN apt-get update && \
    apt-get install -y --no-install-recommends \
        curl \
        libmemcached-dev \
        libz-dev \
        libpq-dev \
        libjpeg-dev \
        libpng-dev \
        libfreetype6-dev \
        libssl-dev \
        libmcrypt-dev

RUN docker-php-ext-install pdo_mysql
RUN docker-php-ext-install gd

.htaccess

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php_flag  log_errors on
php_value error_log  /var/www/html/PHP_errors.log
php_value error_reporting -1

php_flag display_startup_errors on
php_flag display_errors on
php_flag html_errors on

Docker Build

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docker build -t localhost-custom-php $PWD
docker run --name localhost-custom-php-instance --rm -p 8080:80 -v `pwd`:/var/www/html:ro localhost-custom-php

Basic usage of PHP Composer docker image

Cli

Basic usage

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# initial composer project
# --no-interaction (-n)
# --profile
docker run --rm -it \
    -v $PWD:/app \
    composer init -n


# add new library
docker run --rm -it \
    -v $PWD:/app \
    composer require slim/slim "^3.0"


# install a exist composer projects dependents
docker run --rm --interactive --tty \
    --volume $PWD:/app \
    composer install

# create index.php, run test
docker run --rm -p 8082:80 -v `pwd`:/var/www/html:ro php:7-apache

index.php

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<?php
require('vendor/autoload.php');
echo "done";

Reference

https://getcomposer.org/doc/
https://hub.docker.com/_/composer/