What is Dockerfile and what is dockerfile used for ??
What is Dockerfile and what is dockerfile used for ??
A Dockerfile is a text configuration file with specific syntax and pattern. From the dockerfile, docker image is generated. Dockerfile describes step-by-step instruction of all the commands we need to generate a docker image. Dockerfile must be saved with the proper name “Dockerfile”, it’s case sensitive, so we need to take care of that.
We can generate docker image by firing the command “docker build”, where the Dockerfile is placed.
How To Create Dockerfile
Creating a Dockerfile is as easy as creating a regular file in the system. We can landup into any directory which have proper permission to run the docker command. In the same directory, we can simply create a new file and named it as a Dockerfile.
In the below Code is how the exact Dockerfile looks like.
# The line below states we will base our new image on the Latest Official Ubuntu FROM ubuntu:latest # # Identify the maintainer of an image LABEL maintainer="learn@dockerfile.com" # # Update the image to the latest packages RUN apt-get update && apt-get upgrade -y # # Install NGINX to test. RUN apt-get install nginx -y # # Expose port 80 EXPOSE 80 # # Last is the actual command to start up NGINX within our Container CMD ["nginx", "-g", "daemon off;"]
Create Docker Image from the dockerfile
We can specify the command we need in order to make the image from the docker file. In the image code, I have deployed nginx web-server to run the application. To build an image from the Dockerfile, we need to get into the place where Dockerfile resides.
And then fire the command as shown below, “docker build -t nginx-demo .” Here, -t stands for the tag of the image, which here we have given nginx-demo, and dot(.) represnets the dockerfile in the current directory.
$ docker build -t nginx-demo . Sending build context to Docker daemon 2.048kB Step 1/6 : FROM ubuntu:latest ---> 16508e5c265d Step 2/6 : LABEL maintainer="learn@dockerfile.com" ---> Running in 9a06f3ac38db Removing intermediate container 9a06f3ac38db ---> c625b767d4ad Step 3/6 : RUN apt-get update && apt-get upgrade -y ---> Running in 791acb66f251 Get:1 http://security.ubuntu.com/ubuntu bionic-security InRelease [88.7 kB] Get:2 http://archive.ubuntu.com/ubuntu bionic InRelease [242 kB] Get:3 http://archive.ubuntu.com/ubuntu bionic-updates InRelease [88.7 kB] Get:4 http://archive.ubuntu.com/ubuntu bionic-backports InRelease [74.6 kB] Get:5 http://security.ubuntu.com/ubuntu bionic-security/universe Sources [225 kB] Get:6 http://security.ubuntu.com/ubuntu bionic-security/restricted amd64 Packages [116 kB] Get:7 http://security.ubuntu.com/ubuntu bionic-security/multiverse amd64 Packages [10.1 kB] Get:8 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages [1093 kB] Get:9 http://security.ubuntu.com/ubuntu bionic-security/universe amd64 Packages [902 kB] Get:10 http://archive.ubuntu.com/ubuntu bionic/universe Sources [11.5 MB] Get:11 http://archive.ubuntu.com/ubuntu bionic/multiverse amd64 Packages [186 kB] Get:12 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages [1344 kB] Get:13 http://archive.ubuntu.com/ubuntu bionic/restricted amd64 Packages [13.5 kB] Get:14 http://archive.ubuntu.com/ubuntu bionic/universe amd64 Packages [11.3 MB] Get:15 http://archive.ubuntu.com/ubuntu bionic-updates/universe Sources [381 kB] Get:16 http://archive.ubuntu.com/ubuntu bionic-updates/multiverse amd64 Packages [27.7 kB] Get:17 http://archive.ubuntu.com/ubuntu bionic-updates/restricted amd64 Packages [132 kB] Get:18 http://archive.ubuntu.com/ubuntu bionic-updates/universe amd64 Packages [1429 kB] Get:19 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages [1385 kB] Get:20 http://archive.ubuntu.com/ubuntu bionic-backports/main amd64 Packages [8286 B] Get:21 http://archive.ubuntu.com/ubuntu bionic-backports/universe amd64 Packages [8432 B] Fetched 30.6 MB in 4s (6896 kB/s) Reading package lists... Reading package lists... Building dependency tree... Reading state information... Calculating upgrade... The following packages will be upgraded: apt base-files bash bsdutils bzip2 debconf dpkg e2fsprogs fdisk gcc-8-base gpgv grep libapt-pkg5.0 libblkid1 libbz2-1.0 libc-bin libc6 libcom-err2 libdb5.3 libext2fs2 libfdisk1 libgcc1 libgcrypt20 libgnutls30 libidn2-0 libmount1 libpam-modules libpam-modules-bin libpam-runtime libpam0g libprocps6 libseccomp2 libsmartcols1 libss2 libstdc++6 libsystemd0 libudev1 libunistring2 libuuid1 libzstd1 login mount passwd perl-base procps tar ubuntu-keyring util-linux 48 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. Need to get 16.6 MB of archives. After this operation, 193 kB of additional disk space will be used. Get:1 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 gcc-8-base amd64 8.4.0-1ubuntu1~18.04 [18.7 kB] Get:2 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libgcc1 amd64 1:8.4.0-1ubuntu1~18.04 [40.6 kB] Get:3 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libstdc++6 amd64 8.4.0-1ubuntu1~18.04 [400 kB] Get:4 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libc6 amd64 2.27-3ubuntu1.2 [2827 kB] Get:5 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 base-files amd64 10.1ubuntu2.10 [60.4 kB] Get:6 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 bash amd64 4.4.18-2ubuntu1.2 [614 kB] Get:7 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 bsdutils amd64 1:2.31.1-0.4ubuntu3.7 [60.2 kB] Get:8 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 tar amd64 1.29b-2ubuntu0.1 [234 kB] Get:9 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 dpkg amd64 1.19.0.5ubuntu2.3 [1136 kB] Get:10 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libext2fs2 amd64 1.44.1-1ubuntu1.3 [157 kB] Get:11 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 e2fsprogs amd64 1.44.1-1ubuntu1.3 [391 kB] Get:12 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 grep amd64 3.1-2build1 [159 kB] Get:13 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 login amd64 1:4.5-1ubuntu2 [308 kB] Get:14 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 perl-base amd64 5.26.1-6ubuntu0.3 [1390 kB] Get:15 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libuuid1 amd64 2.31.1-0.4ubuntu3.7 [20.1 kB] Get:16 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libblkid1 amd64 2.31.1-0.4ubuntu3.7 [124 kB] Get:17 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libfdisk1 amd64 2.31.1-0.4ubuntu3.7 [164 kB] Get:18 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libmount1 amd64 2.31.1-0.4ubuntu3.7 [136 kB] Get:19 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1.44.1-1ubuntu1.3 [11.1 kB] Get:46 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 passwd amd64 1:4.5-1ubuntu2 [816 kB] Get:47 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libprocps6 amd64 2:3.3.12-3ubuntu1.2 [31.8 kB] Get:48 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 procps amd64 2:3.3.12-3ubuntu1.2 [225 kB] debconf: delaying package configuration, since apt-utils is not installed Fetched 16.6 MB in 0s (33.8 MB/s) (Reading database ... 4037 files and directories currently installed.) 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Setting up debconf (1.5.66ubuntu1) ... debconf: unable to initialize frontend: Dialog debconf: (TERM is not set, so the dialog frontend is not usable.) debconf: falling back to frontend: Readline debconf: unable to initialize frontend: Readline debconf: (Can't locate Term/ReadLine.pm in @INC (you may need to install the Term::ReadLine module) (@INC contains: /etc/perl /usr/local/lib/x86_64-linux-gnu/perl/5.26.1 /usr/local/share/perl/5.26.1 /usr/lib/x86_64-linux-gnu/perl5/5.26 /usr/share/perl5 /usr/lib/x86_64-linux-gnu/perl/5.26 /usr/share/perl/5.26 /usr/local/lib/site_perl /usr/lib/x86_64-linux-gnu/perl-base) at /usr/share/perl5/Debconf/FrontEnd/Readline.pm line 7.) debconf: falling back to frontend: Teletype (Reading database ... 4045 files and directories currently installed.) Preparing to unpack .../libpam0g_1.1.8-3.6ubuntu2.18.04.2_amd64.deb ... Unpacking libpam0g:amd64 (1.1.8-3.6ubuntu2.18.04.2) over (1.1.8-3.6ubuntu2) ... Setting up libpam0g:amd64 (1.1.8-3.6ubuntu2.18.04.2) ... debconf: unable to initialize frontend: Dialog debconf: (TERM is not set, so the dialog frontend is not usable.) debconf: falling back to frontend: Readline debconf: unable to initialize frontend: Readline debconf: (Can't locate Term/ReadLine.pm in @INC (you may need to install the Term::ReadLine module) (@INC contains: /etc/perl /usr/local/lib/x86_64-linux-gnu/perl/5.26.1 /usr/local/share/perl/5.26.1 /usr/lib/x86_64-linux-gnu/perl5/5.26 /usr/share/perl5 /usr/lib/x86_64-linux-gnu/perl/5.26 /usr/share/perl/5.26 /usr/local/lib/site_perl /usr/lib/x86_64-linux-gnu/perl-base) at /usr/share/perl5/Debconf/FrontEnd/Readline.pm line 7.) debconf: falling back to frontend: Teletype (Reading database ... 4045 files and directories currently installed.) Preparing to unpack .../libpam-modules-bin_1.1.8-3.6ubuntu2.18.04.2_amd64.deb ... Unpacking libpam-modules-bin (1.1.8-3.6ubuntu2.18.04.2) over (1.1.8-3.6ubuntu2) ... Setting up libpam-modules-bin (1.1.8-3.6ubuntu2.18.04.2) ... (Reading database ... 4045 files and directories currently installed.) Preparing to unpack .../libpam-modules_1.1.8-3.6ubuntu2.18.04.2_amd64.deb ... debconf: unable to initialize frontend: Dialog debconf: (TERM is not set, so the dialog frontend is not usable.) debconf: falling back to frontend: Readline debconf: unable to initialize frontend: Readline debconf: (Can't locate Term/ReadLine.pm in @INC (you may need to install the Term::ReadLine module) (@INC contains: /etc/perl /usr/local/lib/x86_64-linux-gnu/perl/5.26.1 /usr/local/share/perl/5.26.1 /usr/lib/x86_64-linux-gnu/perl5/5.26 /usr/share/perl5 /usr/lib/x86_64-linux-gnu/perl/5.26 /usr/share/perl/5.26 /usr/local/lib/site_perl /usr/lib/x86_64-linux-gnu/perl-base) at /usr/share/perl5/Debconf/FrontEnd/Readline.pm line 7.) debconf: falling back to frontend: Teletype Unpacking libpam-modules:amd64 (1.1.8-3.6ubuntu2.18.04.2) over (1.1.8-3.6ubuntu2) ... Setting up libpam-modules:amd64 (1.1.8-3.6ubuntu2.18.04.2) ... (Reading database ... 4045 files and directories currently installed.) Preparing to unpack .../mount_2.31.1-0.4ubuntu3.7_amd64.deb ... Unpacking mount (2.31.1-0.4ubuntu3.7) over (2.31.1-0.4ubuntu3.1) ... Preparing to unpack .../libcom-err2_1.44.1-1ubuntu1.3_amd64.deb ... Unpacking libcom-err2:amd64 (1.44.1-1ubuntu1.3) over (1.44.1-1) ... Setting up libcom-err2:amd64 (1.44.1-1ubuntu1.3) ... (Reading database ... 4045 files and directories currently installed.) Preparing to unpack .../libdb5.3_5.3.28-13.1ubuntu1.1_amd64.deb ... Unpacking libdb5.3:amd64 (5.3.28-13.1ubuntu1.1) over (5.3.28-13.1ubuntu1) ... Setting up libdb5.3:amd64 (5.3.28-13.1ubuntu1.1) ... (Reading database ... 4045 files and directories currently installed.) Preparing to unpack .../libpam-runtime_1.1.8-3.6ubuntu2.18.04.2_all.deb ... Unpacking libpam-runtime (1.1.8-3.6ubuntu2.18.04.2) over (1.1.8-3.6ubuntu2) ... Setting up libpam-runtime (1.1.8-3.6ubuntu2.18.04.2) ... debconf: unable to initialize frontend: Dialog debconf: (TERM is not set, so the dialog frontend is not usable.) debconf: falling back to frontend: Readline debconf: unable to initialize frontend: Readline debconf: (Can't locate Term/ReadLine.pm in @INC (you may need to install the Term::ReadLine module) (@INC contains: /etc/perl /usr/local/lib/x86_64-linux-gnu/perl/5.26.1 /usr/local/share/perl/5.26.1 /usr/lib/x86_64-linux-gnu/perl5/5.26 /usr/share/perl5 /usr/lib/x86_64-linux-gnu/perl/5.26 /usr/share/perl/5.26 /usr/local/lib/site_perl /usr/lib/x86_64-linux-gnu/perl-base) at /usr/share/perl5/Debconf/FrontEnd/Readline.pm line 7.) debconf: falling back to frontend: Teletype (Reading database ... 4045 files and directories currently installed.) Preparing to unpack .../libss2_1.44.1-1ubuntu1.3_amd64.deb ... Unpacking libss2:amd64 (1.44.1-1ubuntu1.3) over (1.44.1-1) ... Setting up libss2:amd64 (1.44.1-1ubuntu1.3) ... (Reading database ... 4045 files and directories currently installed.) Preparing to unpack .../passwd_1%3a4.5-1ubuntu2_amd64.deb ... Unpacking passwd (1:4.5-1ubuntu2) over (1:4.5-1ubuntu1) ... Setting up passwd (1:4.5-1ubuntu2) ... (Reading database ... 4045 files and directories currently installed.) Preparing to unpack .../libprocps6_2%3a3.3.12-3ubuntu1.2_amd64.deb ... Unpacking libprocps6:amd64 (2:3.3.12-3ubuntu1.2) over (2:3.3.12-3ubuntu1.1) ... Preparing to unpack .../procps_2%3a3.3.12-3ubuntu1.2_amd64.deb ... Unpacking procps (2:3.3.12-3ubuntu1.2) over (2:3.3.12-3ubuntu1.1) ... Setting up mount (2.31.1-0.4ubuntu3.7) ... Setting up libprocps6:amd64 (2:3.3.12-3ubuntu1.2) ... Setting up bzip2 (1.0.6-8.1ubuntu0.2) ... Setting up procps (2:3.3.12-3ubuntu1.2) ... Processing triggers for libc-bin (2.27-3ubuntu1.2) ... Removing intermediate container 791acb66f251 ---> 538c5534dfd6 Step 4/6 : RUN apt-get install nginx -y ---> Running in e8d5920132a5 Reading package lists... Building dependency tree... Reading state information... The following additional packages will be installed: fontconfig-config fonts-dejavu-core geoip-database iproute2 libatm1 libbsd0 libelf1 libexpat1 libfontconfig1 libfreetype6 libgd3 libgeoip1 libicu60 libjbig0 libjpeg-turbo8 libjpeg8 libmnl0 libnginx-mod-http-geoip libnginx-mod-http-image-filter libnginx-mod-http-xslt-filter libnginx-mod-mail libnginx-mod-stream libpng16-16 libssl1.1 libtiff5 libwebp6 libx11-6 libx11-data libxau6 libxcb1 libxdmcp6 libxml2 libxpm4 libxslt1.1 libxtables12 multiarch-support nginx-common nginx-core ucf Suggested packages: iproute2-doc libgd-tools geoip-bin fcgiwrap nginx-doc ssl-cert The following NEW packages will be installed: fontconfig-config fonts-dejavu-core geoip-database iproute2 libatm1 libbsd0 libelf1 libexpat1 libfontconfig1 libfreetype6 libgd3 libgeoip1 libicu60 libjbig0 libjpeg-turbo8 libjpeg8 libmnl0 libnginx-mod-http-geoip libnginx-mod-http-image-filter libnginx-mod-http-xslt-filter libnginx-mod-mail libnginx-mod-stream libpng16-16 libssl1.1 libtiff5 libwebp6 libx11-6 libx11-data libxau6 libxcb1 libxdmcp6 libxml2 libxpm4 libxslt1.1 libxtables12 multiarch-support nginx nginx-common nginx-core ucf 0 upgraded, 40 newly installed, 0 to remove and 0 not upgraded. Need to get 17.1 MB of archives. After this operation, 61.9 MB of additional disk space will be used. Get:1 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 multiarch-support amd64 2.27-3ubuntu1.2 [6920 B] Get:2 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libjpeg-turbo8 amd64 1.5.2-0ubuntu5.18.04.4 [110 kB] Get:3 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libelf1 amd64 0.170-0.4ubuntu0.1 [44.8 kB] Get:4 http://archive.ubuntu.com/ubuntu bionic/main amd64 libmnl0 amd64 1.0.4-2 [12.3 kB] Get:5 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 iproute2 amd64 4.15.0-2ubuntu1.2 [722 kB] Get:6 http://archive.ubuntu.com/ubuntu bionic/main amd64 libatm1 amd64 1:2.5.1-2build1 [21.9 kB] Get:7 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libbsd0 amd64 0.8.7-1ubuntu0.1 [41.6 kB] Get:8 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libexpat1 amd64 2.2.5-3ubuntu0.2 [80.5 kB] Get:9 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libicu60 amd64 60.2-3ubuntu3.1 [8054 kB] Get:10 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libssl1.1 amd64 1.1.1-1ubuntu2.1~18.04.6 [1301 kB] Get:11 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libxml2 amd64 2.9.4+dfsg1-6.1ubuntu1.3 [663 kB] Get:12 http://archive.ubuntu.com/ubuntu bionic/main amd64 libxtables12 amd64 1.6.1-2ubuntu2 [27.9 kB] Get:13 http://archive.ubuntu.com/ubuntu bionic/main amd64 ucf all 3.0038 [50.5 kB] Get:14 http://archive.ubuntu.com/ubuntu bionic/main amd64 geoip-database all 20180315-1 [2090 kB] Get:15 http://archive.ubuntu.com/ubuntu bionic/main amd64 libgeoip1 amd64 1.6.12-1 [71.8 kB] Get:16 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libpng16-16 amd64 1.6.34-1ubuntu0.18.04.2 [176 kB] Get:17 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libxau6 amd64 1:1.0.8-1ubuntu1 [7556 B] Get:18 http://archive.ubuntu.com/ubuntu bionic/main amd64 libxdmcp6 amd64 1:1.1.2-3 [10.7 kB] Get:19 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libxcb1 amd64 1.13-2~ubuntu18.04 [45.5 kB] Get:20 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libx11-data all 2:1.6.4-3ubuntu0.3 [114 kB] Get:21 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libx11-6 amd64 2:1.6.4-3ubuntu0.3 [571 kB] Get:22 http://archive.ubuntu.com/ubuntu bionic/main amd64 fonts-dejavu-core all 2.37-1 [1041 kB] Get:23 http://archive.ubuntu.com/ubuntu bionic/main amd64 fontconfig-config all 2.12.6-0ubuntu2 [55.8 kB] Get:24 http://archive.ubuntu.com/ubuntu bionic/main amd64 libfreetype6 amd64 2.8.1-2ubuntu2 [335 kB] Get:25 http://archive.ubuntu.com/ubuntu bionic/main amd64 libfontconfig1 amd64 2.12.6-0ubuntu2 [137 kB] Get:26 http://archive.ubuntu.com/ubuntu bionic/main amd64 libjpeg8 amd64 8c-2ubuntu8 [2194 B] Get:27 http://archive.ubuntu.com/ubuntu bionic/main amd64 libjbig0 amd64 2.1-3.1build1 [26.7 kB] Get:28 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libtiff5 amd64 4.0.9-5ubuntu0.3 [153 kB] Get:29 http://archive.ubuntu.com/ubuntu bionic/main amd64 libwebp6 amd64 0.6.1-2 [185 kB] Get:30 http://archive.ubuntu.com/ubuntu bionic/main amd64 libxpm4 amd64 1:3.5.12-1 [34.0 kB] Get:31 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libgd3 amd64 2.2.5-4ubuntu0.4 [119 kB] Get:32 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 nginx-common all 1.14.0-0ubuntu1.7 [37.4 kB] Get:33 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libnginx-mod-http-geoip amd64 1.14.0-0ubuntu1.7 [11.2 kB] Get:34 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libnginx-mod-http-image-filter amd64 1.14.0-0ubuntu1.7 [14.6 kB] Get:35 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libxslt1.1 amd64 1.1.29-5ubuntu0.2 [150 kB] Get:36 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libnginx-mod-http-xslt-filter amd64 1.14.0-0ubuntu1.7 [13.0 kB] Get:37 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libnginx-mod-mail amd64 1.14.0-0ubuntu1.7 [41.8 kB] Get:38 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libnginx-mod-stream amd64 1.14.0-0ubuntu1.7 [63.7 kB] Get:39 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 nginx-core amd64 1.14.0-0ubuntu1.7 [413 kB] Get:40 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 nginx all 1.14.0-0ubuntu1.7 [3596 B] debconf: delaying package configuration, since apt-utils is not installed Fetched 17.1 MB in 0s (40.8 MB/s) Selecting previously unselected package multiarch-support. (Reading database ... 4045 files and directories currently installed.) Preparing to unpack .../multiarch-support_2.27-3ubuntu1.2_amd64.deb ... Unpacking multiarch-support (2.27-3ubuntu1.2) ... Setting up multiarch-support (2.27-3ubuntu1.2) ... Selecting previously unselected package libjpeg-turbo8:amd64. (Reading database ... 4048 files and directories currently installed.) Preparing to unpack .../00-libjpeg-turbo8_1.5.2-0ubuntu5.18.04.4_amd64.deb ... Unpacking libjpeg-turbo8:amd64 (1.5.2-0ubuntu5.18.04.4) ... Selecting previously unselected package libelf1:amd64. Preparing to unpack .../01-libelf1_0.170-0.4ubuntu0.1_amd64.deb ... Unpacking libelf1:amd64 (0.170-0.4ubuntu0.1) ... Selecting previously unselected package libmnl0:amd64. Preparing to unpack .../02-libmnl0_1.0.4-2_amd64.deb ... Unpacking libmnl0:amd64 (1.0.4-2) ... Selecting previously unselected package iproute2. Preparing to unpack .../03-iproute2_4.15.0-2ubuntu1.2_amd64.deb ... Unpacking iproute2 (4.15.0-2ubuntu1.2) ... 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Unpacking libxml2:amd64 (2.9.4+dfsg1-6.1ubuntu1.3) ... Selecting previously unselected package libxtables12:amd64. Preparing to unpack .../10-libxtables12_1.6.1-2ubuntu2_amd64.deb ... Unpacking libxtables12:amd64 (1.6.1-2ubuntu2) ... Selecting previously unselected package ucf. Preparing to unpack .../11-ucf_3.0038_all.deb ... Moving old data out of the way Unpacking ucf (3.0038) ... Selecting previously unselected package geoip-database. Preparing to unpack .../12-geoip-database_20180315-1_all.deb ... Unpacking geoip-database (20180315-1) ... Selecting previously unselected package libgeoip1:amd64. Preparing to unpack .../13-libgeoip1_1.6.12-1_amd64.deb ... Unpacking libgeoip1:amd64 (1.6.12-1) ... Selecting previously unselected package libpng16-16:amd64. Preparing to unpack .../14-libpng16-16_1.6.34-1ubuntu0.18.04.2_amd64.deb ... Unpacking libpng16-16:amd64 (1.6.34-1ubuntu0.18.04.2) ... Selecting previously unselected package libxau6:amd64. 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Unpacking libtiff5:amd64 (4.0.9-5ubuntu0.3) ... Selecting previously unselected package libwebp6:amd64. Preparing to unpack .../27-libwebp6_0.6.1-2_amd64.deb ... Unpacking libwebp6:amd64 (0.6.1-2) ... Selecting previously unselected package libxpm4:amd64. Preparing to unpack .../28-libxpm4_1%3a3.5.12-1_amd64.deb ... Unpacking libxpm4:amd64 (1:3.5.12-1) ... Selecting previously unselected package libgd3:amd64. Preparing to unpack .../29-libgd3_2.2.5-4ubuntu0.4_amd64.deb ... Unpacking libgd3:amd64 (2.2.5-4ubuntu0.4) ... Selecting previously unselected package nginx-common. Preparing to unpack .../30-nginx-common_1.14.0-0ubuntu1.7_all.deb ... Unpacking nginx-common (1.14.0-0ubuntu1.7) ... Selecting previously unselected package libnginx-mod-http-geoip. Preparing to unpack .../31-libnginx-mod-http-geoip_1.14.0-0ubuntu1.7_amd64.deb ... Unpacking libnginx-mod-http-geoip (1.14.0-0ubuntu1.7) ... Selecting previously unselected package libnginx-mod-http-image-filter. 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Preparing to unpack .../37-nginx-core_1.14.0-0ubuntu1.7_amd64.deb ... Unpacking nginx-core (1.14.0-0ubuntu1.7) ... Selecting previously unselected package nginx. Preparing to unpack .../38-nginx_1.14.0-0ubuntu1.7_all.deb ... Unpacking nginx (1.14.0-0ubuntu1.7) ... Setting up libexpat1:amd64 (2.2.5-3ubuntu0.2) ... Setting up libicu60:amd64 (60.2-3ubuntu3.1) ... Setting up geoip-database (20180315-1) ... Setting up libpng16-16:amd64 (1.6.34-1ubuntu0.18.04.2) ... Setting up libjbig0:amd64 (2.1-3.1build1) ... Setting up fonts-dejavu-core (2.37-1) ... Setting up libelf1:amd64 (0.170-0.4ubuntu0.1) ... Setting up nginx-common (1.14.0-0ubuntu1.7) ... debconf: unable to initialize frontend: Dialog debconf: (TERM is not set, so the dialog frontend is not usable.) debconf: falling back to frontend: Readline debconf: unable to initialize frontend: Readline debconf: (Can't locate Term/ReadLine.pm in @INC (you may need to install the Term::ReadLine module) (@INC contains: /etc/perl /usr/local/lib/x86_64-linux-gnu/perl/5.26.1 /usr/local/share/perl/5.26.1 /usr/lib/x86_64-linux-gnu/perl5/5.26 /usr/share/perl5 /usr/lib/x86_64-linux-gnu/perl/5.26 /usr/share/perl/5.26 /usr/local/lib/site_perl /usr/lib/x86_64-linux-gnu/perl-base) at /usr/share/perl5/Debconf/FrontEnd/Readline.pm line 7.) debconf: falling back to frontend: Teletype Setting up libjpeg-turbo8:amd64 (1.5.2-0ubuntu5.18.04.4) ... Setting up libgeoip1:amd64 (1.6.12-1) ... Setting up libbsd0:amd64 (0.8.7-1ubuntu0.1) ... Setting up ucf (3.0038) ... debconf: unable to initialize frontend: Dialog debconf: (TERM is not set, so the dialog frontend is not usable.) debconf: falling back to frontend: Readline debconf: unable to initialize frontend: Readline debconf: (Can't locate Term/ReadLine.pm in @INC (you may need to install the Term::ReadLine module) (@INC contains: /etc/perl /usr/local/lib/x86_64-linux-gnu/perl/5.26.1 /usr/local/share/perl/5.26.1 /usr/lib/x86_64-linux-gnu/perl5/5.26 /usr/share/perl5 /usr/lib/x86_64-linux-gnu/perl/5.26 /usr/share/perl/5.26 /usr/local/lib/site_perl /usr/lib/x86_64-linux-gnu/perl-base) at /usr/share/perl5/Debconf/FrontEnd/Readline.pm line 7.) debconf: falling back to frontend: Teletype Setting up libxml2:amd64 (2.9.4+dfsg1-6.1ubuntu1.3) ... Setting up libfreetype6:amd64 (2.8.1-2ubuntu2) ... Setting up libxslt1.1:amd64 (1.1.29-5ubuntu0.2) ... Setting up libatm1:amd64 (1:2.5.1-2build1) ... Setting up libxtables12:amd64 (1.6.1-2ubuntu2) ... Setting up libssl1.1:amd64 (1.1.1-1ubuntu2.1~18.04.6) ... debconf: unable to initialize frontend: Dialog debconf: (TERM is not set, so the dialog frontend is not usable.) debconf: falling back to frontend: Readline debconf: unable to initialize frontend: Readline debconf: (Can't locate Term/ReadLine.pm in @INC (you may need to install the Term::ReadLine module) (@INC contains: /etc/perl /usr/local/lib/x86_64-linux-gnu/perl/5.26.1 /usr/local/share/perl/5.26.1 /usr/lib/x86_64-linux-gnu/perl5/5.26 /usr/share/perl5 /usr/lib/x86_64-linux-gnu/perl/5.26 /usr/share/perl/5.26 /usr/local/lib/site_perl /usr/lib/x86_64-linux-gnu/perl-base) at /usr/share/perl5/Debconf/FrontEnd/Readline.pm line 7.) debconf: falling back to frontend: Teletype Setting up libnginx-mod-mail (1.14.0-0ubuntu1.7) ... Setting up libnginx-mod-http-xslt-filter (1.14.0-0ubuntu1.7) ... Setting up libxdmcp6:amd64 (1:1.1.2-3) ... Setting up libmnl0:amd64 (1.0.4-2) ... Setting up libnginx-mod-http-geoip (1.14.0-0ubuntu1.7) ... Setting up libx11-data (2:1.6.4-3ubuntu0.3) ... Setting up libxau6:amd64 (1:1.0.8-1ubuntu1) ... Setting up libwebp6:amd64 (0.6.1-2) ... Setting up libjpeg8:amd64 (8c-2ubuntu8) ... Setting up fontconfig-config (2.12.6-0ubuntu2) ... Setting up libnginx-mod-stream (1.14.0-0ubuntu1.7) ... Setting up libtiff5:amd64 (4.0.9-5ubuntu0.3) ... Setting up iproute2 (4.15.0-2ubuntu1.2) ... Setting up libxcb1:amd64 (1.13-2~ubuntu18.04) ... Setting up libfontconfig1:amd64 (2.12.6-0ubuntu2) ... Setting up libx11-6:amd64 (2:1.6.4-3ubuntu0.3) ... Setting up libxpm4:amd64 (1:3.5.12-1) ... Setting up libgd3:amd64 (2.2.5-4ubuntu0.4) ... Setting up libnginx-mod-http-image-filter (1.14.0-0ubuntu1.7) ... Setting up nginx-core (1.14.0-0ubuntu1.7) ... invoke-rc.d: could not determine current runlevel invoke-rc.d: policy-rc.d denied execution of start. Setting up nginx (1.14.0-0ubuntu1.7) ... Processing triggers for libc-bin (2.27-3ubuntu1.2) ... Removing intermediate container e8d5920132a5 ---> 1586927b8c68 Step 5/6 : EXPOSE 80 ---> Running in 8167f2690b28 Removing intermediate container 8167f2690b28 ---> c510f56fd849 Step 6/6 : CMD ["nginx", "-g", "daemon off;"] ---> Running in 7248000129fd Removing intermediate container 7248000129fd ---> b98f009c6e7c Successfully built b98f009c6e7c Successfully tagged nginx-demo:latest
After the build got successfully created, we can see the images into the image repository. To view the images we can fire the command, “docker images”, it will appear like shown in the below.
$ docker images REPOSITORY TAG IMAGE ID CREATED SIZE nginx-demo latest b98f009c6e7c 5 seconds ago 250MB ubuntu latest 16508e5c265d 2 years ago 84.1MB redis latest 4e8db158f18d 2 years ago 83.4MB weaveworks/scope 1.9.1 4b07159e407b 2 years ago 68MB alpine latest 11cd0b38bc3c 2 years ago 4.41MB
If you rebuild the image for next time, then it will cache the data from it’s own repository and make the image faster.
$ docker build -t nginx-demo-new . Sending build context to Docker daemon 2.048kB Step 1/6 : FROM ubuntu:latest ---> 16508e5c265d Step 2/6 : LABEL maintainer="learn@dockerfile.com" ---> Using cache ---> c625b767d4ad Step 3/6 : RUN apt-get update && apt-get upgrade -y ---> Using cache ---> 538c5534dfd6 Step 4/6 : RUN apt-get install nginx -y ---> Using cache ---> 1586927b8c68 Step 5/6 : EXPOSE 80 ---> Using cache ---> c510f56fd849 Step 6/6 : CMD ["nginx", "-g", "daemon off;"] ---> Using cache ---> b98f009c6e7c Successfully built b98f009c6e7c Successfully tagged nginx-demo-new:latest
That’s all you need to know about Dockerfile. Keep Learning.