minhchuduc

package main

import (
	"bytes"
	"context"
	"crypto/tls"
	"errors"
	"fmt"
	"io/ioutil"
	"log"

minhchuduc

Code is clean if it can be understood easily – by everyone on the team. Clean code can be read and enhanced by a developer other than its original author. With understandability comes readability, changeability, extensibility and maintainability.

---

General rules

1. Follow standard conventions.
2. Keep it simple stupid. Simpler is always better. Reduce complexity as much as possible.
3. Boy scout rule. Leave the campground cleaner than you found it.
4. Always find root cause. Always look for the root cause of a problem.

Design rules

minhchuduc

#!/bin/bash
GARBAGE="/var/lib/docker/aufs/diff"
du -hd 1 $GARBAGE | sort -hrk 1 | head -25
find $GARBAGE -maxdepth 1 -name '*-removing' -exec rm -rf '{}' \;

minhchuduc

Get started with Elm

Try online

Try Elm

Install

Download package from elm-lang.org

minhchuduc

Learning FP the hard way: Experiences on the Elm language

by Ossi Hanhinen, @ohanhi

with the support of Futurice 💚.

Licensed under CC BY 4.0.

Editorial note

minhchuduc

Build a OS image with QEMU and Ubuntu Cloud Image

Prerequirements

• Packer
• QEMU
• Docker

Build an image of cloud-init settings

minhchuduc

#! /bin/sh

### Must have Gcloud sdk installed and configured

###Create a micro instance as ansible master
gcloud compute --project $PROJECT_NAME instances create "ansible" --zone "us-central1-b" --machine-type "f1-micro" --network "default" --maintenance-policy "MIGRATE" --scopes "https://www.googleapis.com/auth/userinfo.email" "https://www.googleapis.com/auth/compute" "https://www.googleapis.com/auth/devstorage.full_control" --tags "http-server" "https-server" --no-boot-disk-auto-delete

###or a centos like in the tutorial
gcloud compute --project $PROJECT_NAME instances create "ansible-master" --zone "us-central1-b" --machine-type "g1-small" --network "default" --maintenance-policy "MIGRATE" --scopes "https://www.googleapis.com/auth/userinfo.email" "https://www.googleapis.com/auth/compute" "https://www.googleapis.com/auth/devstorage.full_control" --tags "http-server" "https-server" --image "https://www.googleapis.com/compute/v1/projects/centos-cloud/global/images/centos-7-v20140926" --no-boot-disk-auto-de

minhchuduc

#
# Enable CEPH repos as described at http://ceph.com/docs/master/install/get-packages/#rpm
# Install ceph-deploy package
#

export DATA_DEV=sdb
export JRNL_DEV=sdc
export FS_TYPE=xfs
export CEPH_S_NODE=ceph-s
export CEPH_RELEASE=giant

minhchuduc

# Ubuntu 14.04 don't have nsenter - the straight forward way required me to install build tools and etc.
# I preferred to keep the system clean and install nsenter in a container and then copy the command to the host
# Note - its also possible to run nsenter from a container (didn't tried) https://github.com/jpetazzo/nsenter

# start a container
docker run --name nsenter -it ubuntu:14.04 bash

## in the docker
apt-get update
apt-get install git build-essential libncurses5-dev libslang2-dev gettext zlib1g-dev libselinux1-dev debhelper lsb-release pkg-config po-debconf autoconf automake autopoint libtool

minhchuduc

import logging
import uuid
import time

from mesos.interface import Scheduler
from mesos.native import MesosSchedulerDriver
from mesos.interface import mesos_pb2

logging.basicConfig(level=logging.INFO)