Initial commit

{\rtf1\ansi\ansicpg1252\cocoartf1038\cocoasubrtf350

{\fonttbl\f0\fswiss\fcharset0 Helvetica;}

{\colortbl;\red255\green255\blue255;}

\margl1440\margr1440\vieww9000\viewh8400\viewkind0

\pard\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx5760\tx6480\tx7200\tx7920\tx8640\ql\qnatural\pardirnatural

\f0\fs24 \cf0 No work files for this lesson...}

 No newline at end of file

FROM debian:jessie

RUN mkdir /vol && touch /vol/file1

VOLUME /vol

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

long long readLongFile(char *file) {

	FILE *f = fopen(file, "r");

	if (!f) {

		return -1;

	}

	char buffer[30]; // enough to contain "9223372036854771712" (20 chars) with some give

	size_t bytes = fread(buffer, sizeof(*buffer), sizeof(buffer), f);

	fclose(f);

	if (bytes < 1) {

		return -1;

	}

	buffer[bytes] = 0;

	return atoll(buffer);

}

void printMemUsage() {

	double usage = readLongFile("/sys/fs/cgroup/memory/memory.usage_in_bytes") / 1024.0 / 1024.0;

	double limit = readLongFile("/sys/fs/cgroup/memory/memory.limit_in_bytes") / 1024.0 / 1024.0;

	printf("current usage within memory cgroup: %.02f MB / %.02f MB\n", usage, limit);

}

void forceMalloc(size_t bytes) {

	printf("malloc: %zu MB", bytes / 1024 / 1024);

	size_t ints = bytes / sizeof(int);

	int *ptr = malloc(bytes);

	size_t i;

	for (i = 0; i < ints; ++i) {

		ptr[i] = rand();

	}

	printf("\n");

}

int main() {

	printMemUsage(); // ~ 0 MB

	forceMalloc(100 * 1024 * 1024);

	printMemUsage(); // ~ 100 MB

	forceMalloc(100 * 1024 * 1024);

	printMemUsage(); // ~ 200 MB

	return 0;

}

version: '2'

services:

  wordpress_db:

    image: mariadb

    environment:

      MYSQL_ROOT_PASSWORD: password

  wordpress:

    depends_on:

      - wordpress_db

    image: wordpress

    ports:

      - 8080:80

    environment:

      WORDPRESS_DB_HOST: wordpress_db

      WORDPRESS_DB_PASSWORD: password