In this tuto, I'll show you how to create Docker Images with a Dockerfile. Dockerfile allow you to quickly configure and create an image.
Before you create a dockerfile, you should become familiar with the dockerfile command. There are some dockerfile commands you must know:
FROM: allows you to define from which base your image has been created.
MAINTAINER: Optional, it contains the name of the maintainer of the image.
RUN: allows you to execute a command during the build process of the docker image.
ADD: allows you to copy a file from the host machine to the new docker image.
EXPOSE: allows to expose a container port to the outside.
CMD: determines the command that will be executed when the container starts.
ENTRYPOINT: Define the default command that will be executed when the container is running.
WORKDIR: allows you to define the working folder for all other commands (for example RUN, CMD, ENTRYPOINT and ADD)
ENV: allows you to define environment variables which can then be modified using the command parameter run --env <key>=<value>.
VOLUME: Enable access/linked directory between the container and the host machine.
Example:
Create Dockerfile file like this:
FROM debian:buster-slim
# add our user and group first to make sure their IDs get assigned consistently, regardless of whatever dependencies get added
#RUN groupadd -r www-data && useradd -r --create-home -g www-data www-data
ENV HTTPD_PREFIX /usr/local/apache2
ENV PATH $HTTPD_PREFIX/bin:$PATH
RUN mkdir -p "$HTTPD_PREFIX" \
&& chown www-data:www-data "$HTTPD_PREFIX"
WORKDIR $HTTPD_PREFIX
# install httpd runtime dependencies
# https://httpd.apache.org/docs/2.4/install.html#requirements
RUN set -eux; \
apt-get update; \
apt-get install -y --no-install-recommends \
libapr1-dev \
libaprutil1-dev \
libaprutil1-ldap \
; \
rm -rf /var/lib/apt/lists/*
ENV HTTPD_VERSION 2.4.39
ENV HTTPD_SHA256 b4ca9d05773aa59b54d66cd8f4744b945289f084d3be17d7981d1783a5decfa2
# https://httpd.apache.org/security/vulnerabilities_24.html
ENV HTTPD_PATCHES=""
# see https://httpd.apache.org/docs/2.4/install.html#requirements
RUN set -eux; \
\
# mod_http2 mod_lua mod_proxy_html mod_xml2enc
# https://anonscm.debian.org/cgit/pkg-apache/apache2.git/tree/debian/control?id=adb6f181257af28ee67af15fc49d2699a0080d4c
savedAptMark="$(apt-mark showmanual)"; \
apt-get update; \
apt-get install -y --no-install-recommends \
bzip2 \
ca-certificates \
dirmngr \
dpkg-dev \
gcc \
gnupg \
libbrotli-dev \
libcurl4-openssl-dev \
libjansson-dev \
liblua5.2-dev \
libnghttp2-dev \
libpcre3-dev \
libssl-dev \
libxml2-dev \
make \
wget \
zlib1g-dev \
; \
rm -r /var/lib/apt/lists/*; \
\
ddist() { \
local f="$1"; shift; \
local distFile="$1"; shift; \
local success=; \
local distUrl=; \
for distUrl in \
# https://issues.apache.org/jira/browse/INFRA-8753?focusedCommentId=14735394#comment-14735394
'https://www.apache.org/dyn/closer.cgi?action=download&filename=' \
# if the version is outdated (or we're grabbing the .asc file), we might have to pull from the dist/archive :/
https://www-us.apache.org/dist/ \
https://www.apache.org/dist/ \
https://archive.apache.org/dist/ \
; do \
if wget -O "$f" "$distUrl$distFile" && [ -s "$f" ]; then \
success=1; \
break; \
fi; \
done; \
[ -n "$success" ]; \
}; \
\
ddist 'httpd.tar.bz2' "httpd/httpd-$HTTPD_VERSION.tar.bz2"; \
echo "$HTTPD_SHA256 *httpd.tar.bz2" | sha256sum -c -; \
\
# see https://httpd.apache.org/download.cgi#verify
ddist 'httpd.tar.bz2.asc' "httpd/httpd-$HTTPD_VERSION.tar.bz2.asc"; \
export GNUPGHOME="$(mktemp -d)"; \
for key in \
# gpg: key 791485A8: public key "Jim Jagielski (Release Signing Key) <jim@apache.org>" imported
A93D62ECC3C8EA12DB220EC934EA76E6791485A8 \
# gpg: key 995E35221AD84DFF: public key "Daniel Ruggeri (https://home.apache.org/~druggeri/) <druggeri@apache.org>" imported
B9E8213AEFB861AF35A41F2C995E35221AD84DFF \
; do \
gpg --batch --keyserver ha.pool.sks-keyservers.net --recv-keys "$key"; \
done; \
gpg --batch --verify httpd.tar.bz2.asc httpd.tar.bz2; \
command -v gpgconf && gpgconf --kill all || :; \
rm -rf "$GNUPGHOME" httpd.tar.bz2.asc; \
\
mkdir -p src; \
tar -xf httpd.tar.bz2 -C src --strip-components=1; \
rm httpd.tar.bz2; \
cd src; \
\
patches() { \
while [ "$#" -gt 0 ]; do \
local patchFile="$1"; shift; \
local patchSha256="$1"; shift; \
ddist "$patchFile" "httpd/patches/apply_to_$HTTPD_VERSION/$patchFile"; \
echo "$patchSha256 *$patchFile" | sha256sum -c -; \
patch -p0 < "$patchFile"; \
rm -f "$patchFile"; \
done; \
}; \
patches $HTTPD_PATCHES; \
\
gnuArch="$(dpkg-architecture --query DEB_BUILD_GNU_TYPE)"; \
./configure \
--build="$gnuArch" \
--prefix="$HTTPD_PREFIX" \
--enable-mods-shared=reallyall \
--enable-mpms-shared=all \
; \
make -j "$(nproc)"; \
make install; \
\
cd ..; \
rm -r src man manual; \
\
sed -ri \
-e 's!^(\s*CustomLog)\s+\S+!\1 /proc/self/fd/1!g' \
-e 's!^(\s*ErrorLog)\s+\S+!\1 /proc/self/fd/2!g' \
-e 's!^(\s*TransferLog)\s+\S+!\1 /proc/self/fd/1!g' \
"$HTTPD_PREFIX/conf/httpd.conf" \
"$HTTPD_PREFIX/conf/extra/httpd-ssl.conf" \
; \
\
# reset apt-mark's "manual" list so that "purge --auto-remove" will remove all build dependencies
apt-mark auto '.*' > /dev/null; \
[ -z "$savedAptMark" ] || apt-mark manual $savedAptMark; \
find /usr/local -type f -executable -exec ldd '{}' ';' \
| awk '/=>/ { print $(NF-1) }' \
| sort -u \
| xargs -r dpkg-query --search \
| cut -d: -f1 \
| sort -u \
| xargs -r apt-mark manual \
; \
apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false; \
\
# smoke test
httpd -v
COPY httpd-foreground /usr/local/bin/
EXPOSE 80
CMD ["httpd-foreground"]
Build New Docker Image and Create New Container Based on it:
use this command line to build new docker image:
docker build -t codimth_apache .
Now run the new container with the command below:
docker run -d -p 80:80 codimth_apache
For testing open the web browser and type the host machine IP address like this:
http://127.0.0.1:80
