13. DevOps: Working with dockerfile to build apache2 container

In continuation of my previous session on :”12. DevOps: How to build docker images using dockerfile ? ”, in this session I would like to demonstrate the exercises on:

Working with dockerfile to build apache2 container:

In this exercise, I would like to build a container with apache2 web server setup.

Finally, at the end of this exercise; you will see Apache2 web page running from firefox browser in a docker container.

Note: If you want to recollect the docker commands to be used during your current lab practice, visit my blog link:

https://vskumarblogs.wordpress.com/2017/12/13/some-useful-docker-commands-for-handling-images-and-containers/
Now, I want to create a separate directory as below:

====================>

vskumar@ubuntu:~$ pwd

/home/vskumar

vskumar@ubuntu:~$

vskumar@ubuntu:~$ mkdir apache1

vskumar@ubuntu:~$ cd apache1

vskumar@ubuntu:~/apache1$ pwd

/home/vskumar/apache1

vskumar@ubuntu:~/apache1$

====================>

To install apache2 on ubuntu16.04, let us analyze the steps as below:

Step 1: Install Apache

To install appache2 on unbuntu we can use the following commands:

sudo apt-get update sudo apt-get install apache2

We need to include the above commands in dockerfile.

Let me use the overall commands in the dockerfile as below:

======== You can see the current dockerfile, which will be used ====>

vskumar@ubuntu:~/apache1$ pwd

/home/vskumar/apache1

vskumar@ubuntu:~/apache1$ ls

dockerfile

vskumar@ubuntu:~/apache1$ cat dockerfile

FROM ubuntu:16.04

MAINTAINER “Vskumar” <vskumar35@gmail.com>

RUN apt-get update && apt-get clean

RUN apt-get -y install apache2 && apt-get clean

RUN echo “Apache running!!” >> /var/www/html/index.html

# We have used the base image of ubuntu 16.04

# update all

# cleaned all

# We have installed Apache

# We have echoed a message as Apache is running

# into index.html file

EXPOSE 80

# WE have allocated the port # 80 to apache2

vskumar@ubuntu:~/apache1$

====The above lines are from dockerfile to install apache2 in Ubuntu container ====>

So, the above dockerfile purpose is;

It builds the container of ubuntu 16.04 with the maintainer name “vskumar”.
It updates the current libs/packages.
It installs the apache2.
It sends a message
It allocates port # 80, with EXPOSE command.

Now, let us run this build as below and review the output:

=============== Installing apache2 on ubuntu container with dockerfile =====>

vskumar@ubuntu:~/apache1$ sudo docker build -t ubuntu16.04/apache2 .

Sending build context to Docker daemon 2.048kB

Step 1/6 : FROM ubuntu:16.04

—> 20c44cd7596f

Step 2/6 : MAINTAINER “Vskumar” <vskumar35@gmail.com>

—> Running in e7c786e9d724

Removing intermediate container e7c786e9d724

—> de795f3ddd1f

Step 3/6 : RUN apt-get update && apt-get clean

—> Running in 712d867e5412

Get:1 http://security.ubuntu.com/ubuntu xenial-security InRelease [102 kB]

Get:2 http://archive.ubuntu.com/ubuntu xenial InRelease [247 kB]

Get:3 http://archive.ubuntu.com/ubuntu xenial-updates InRelease [102 kB]

Get:4 http://archive.ubuntu.com/ubuntu xenial-backports InRelease [102 kB]

Get:5 http://archive.ubuntu.com/ubuntu xenial/universe Sources [9802 kB]

Get:6 http://security.ubuntu.com/ubuntu xenial-security/universe Sources [53.1 kB]

Get:7 http://security.ubuntu.com/ubuntu xenial-security/main amd64 Packages [505 kB]

Get:8 http://security.ubuntu.com/ubuntu xenial-security/restricted amd64 Packages [12.9 kB]

Get:9 http://security.ubuntu.com/ubuntu xenial-security/universe amd64 Packages [229 kB]

Get:10 http://security.ubuntu.com/ubuntu xenial-security/multiverse amd64 Packages [3479 B]

Get:11 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages [1558 kB]

Get:12 http://archive.ubuntu.com/ubuntu xenial/restricted amd64 Packages [14.1 kB]

Get:13 http://archive.ubuntu.com/ubuntu xenial/universe amd64 Packages [9827 kB]

Get:14 http://archive.ubuntu.com/ubuntu xenial/multiverse amd64 Packages [176 kB]

Get:15 http://archive.ubuntu.com/ubuntu xenial-updates/universe Sources [231 kB]

Get:16 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages [866 kB]

Get:17 http://archive.ubuntu.com/ubuntu xenial-updates/restricted amd64 Packages [13.7 kB]

Get:18 http://archive.ubuntu.com/ubuntu xenial-updates/universe amd64 Packages [719 kB]

Get:19 http://archive.ubuntu.com/ubuntu xenial-updates/multiverse amd64 Packages [18.5 kB]

Get:20 http://archive.ubuntu.com/ubuntu xenial-backports/main amd64 Packages [5174 B]

Get:21 http://archive.ubuntu.com/ubuntu xenial-backports/universe amd64 Packages [7150 B]

Fetched 24.6 MB in 29s (825 kB/s)

Reading package lists…

Removing intermediate container 712d867e5412

—> 1780fbb9121e

Step 4/6 : RUN apt-get -y install apache2 && apt-get clean

—> Running in d9e9198a3e05

Reading package lists…

Building dependency tree…

Reading state information…

The following additional packages will be installed:

apache2-bin apache2-data apache2-utils file ifupdown iproute2

isc-dhcp-client isc-dhcp-common libapr1 libaprutil1 libaprutil1-dbd-sqlite3

libaprutil1-ldap libasn1-8-heimdal libatm1 libdns-export162 libexpat1

libffi6 libgdbm3 libgmp10 libgnutls30 libgssapi3-heimdal libhcrypto4-heimdal

libheimbase1-heimdal libheimntlm0-heimdal libhogweed4 libhx509-5-heimdal

libicu55 libidn11 libisc-export160 libkrb5-26-heimdal libldap-2.4-2

liblua5.1-0 libmagic1 libmnl0 libnettle6 libp11-kit0 libperl5.22

libroken18-heimdal libsasl2-2 libsasl2-modules libsasl2-modules-db

libsqlite3-0 libssl1.0.0 libtasn1-6 libwind0-heimdal libxml2 libxtables11

mime-support netbase openssl perl perl-modules-5.22 rename sgml-base

ssl-cert xml-core

Suggested packages:

www-browser apache2-doc apache2-suexec-pristine | apache2-suexec-custom ufw

ppp rdnssd iproute2-doc resolvconf avahi-autoipd isc-dhcp-client-ddns

apparmor gnutls-bin libsasl2-modules-otp libsasl2-modules-ldap

libsasl2-modules-sql libsasl2-modules-gssapi-mit

| libsasl2-modules-gssapi-heimdal ca-certificates perl-doc

libterm-readline-gnu-perl | libterm-readline-perl-perl make sgml-base-doc

openssl-blacklist debhelper

The following NEW packages will be installed:

apache2 apache2-bin apache2-data apache2-utils file ifupdown iproute2