How to create Apache image using Dockerfile

Table of contents 1. Docker Image 2. Create an instance based on an existing image 3. Create based on local template 4. Create based on Dockerfile 1. Docker Image 1.1 Docker image The application uses the published standard format to support the operation of a Docker container 1.2 How to create a docker image Create based on an existing image Create based on local template Create based on Dockerfile Docker images are layered structures ① Each instruction in the Dockerfile will create a new image layer ② The image layer will be cached and reused ③ When the Dockerfile instruction is modified, the copied file changes, or the variables specified when building the image are different, the corresponding image layer cache will become invalid ④ After the image cache of a layer becomes invalid, the image layer cache after it will also become invalid ⑤ The image layer is immutable. If you add a file in a layer and then delete it in the next layer, the image will still contain the file 2. Create an instance based on an existing image Package the programs and operating environment running in the container to generate a new image docker commit options container id image name you want to create: tag -m: description information -a: Author information -p: Stop the container during the build process Examples [root@server1 ~]# docker ps -a #Existing container CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 86cf506635da centos:7 "/bin/bash" 6 seconds ago Up 5 seconds nervous_shockley [root@server1 ~]# docker commit -m "image" -a "zf" -p 86cf506635da docker:new #Create docker: new image sha256:e3056b40acd772abc9a39c6c4f3cb42ba119eb9392b32fb275414f00e82d55b2 [root@server1 ~]# docker images #View the generated image REPOSITORY TAG IMAGE ID CREATED SIZE docker new e3056b40acd7 9 seconds ago 267MB centos 7 4f280dc8c807 21 hours ago 267MB #It is best to stop the container and create the image 3. Create based on local template Generate a new image by importing the operating system template file and use the wget command to import it as a local image [root@server1 ~]# cat debian-7.0-x86-minimal.tar.gz \| docker import - daoke:new #Import template name image name daoke:new [root@server1 ~]# docker images #View the generated image REPOSITORY TAG IMAGE ID CREATED SIZE daoke new 61b2d8af0457 38 seconds ago 215MB docker new e3056b40acd7 10 minutes ago 267MB centos 7 4f280dc8c807 22 hours ago 267MB 4. Create based on Dockerfile A Dockerfile is a file consisting of a set of instructions. File structure: Base image information Maintainer information Mirror operation instructions Execute instructions when the container starts Dockerfile supports one instruction per line. Each instruction can carry multiple parameters and supports comments starting with "#". Dockerfile operation instructions:

1. Docker Image
2. Create an instance based on an existing image
3. Create based on local template
4. Create based on Dockerfile

1. Docker Image

1.1 Docker image

The application uses the published standard format to support the operation of a Docker container

1.2 How to create a docker image

Create based on an existing image
Create based on local template
Create based on Dockerfile

Docker images are layered structures

insert image description here

① Each instruction in the Dockerfile will create a new image layer ② The image layer will be cached and reused ③ When the Dockerfile instruction is modified, the copied file changes, or the variables specified when building the image are different, the corresponding image layer cache will become invalid ④ After the image cache of a layer becomes invalid, the image layer cache after it will also become invalid ⑤ The image layer is immutable. If you add a file in a layer and then delete it in the next layer, the image will still contain the file

2. Create an instance based on an existing image

Package the programs and operating environment running in the container to generate a new image

docker commit options container id image name you want to create: tag
-m: description information
-a: Author information
-p: Stop the container during the build process

Examples

[root@server1 ~]# docker ps -a #Existing container CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
86cf506635da centos:7 "/bin/bash" 6 seconds ago Up 5 seconds nervous_shockley
[root@server1 ~]# docker commit -m "image" -a "zf" -p 86cf506635da docker:new #Create docker: new image sha256:e3056b40acd772abc9a39c6c4f3cb42ba119eb9392b32fb275414f00e82d55b2
[root@server1 ~]# docker images #View the generated image REPOSITORY TAG IMAGE ID CREATED SIZE
docker new e3056b40acd7 9 seconds ago 267MB
centos 7 4f280dc8c807 21 hours ago 267MB
#It is best to stop the container and create the image

3. Create based on local template

Generate a new image by importing the operating system template file and use the wget command to import it as a local image

insert image description here

[root@server1 ~]# cat debian-7.0-x86-minimal.tar.gz | docker import - daoke:new #Import template name image name daoke:new
[root@server1 ~]# docker images #View the generated image REPOSITORY TAG IMAGE ID CREATED SIZE
daoke new 61b2d8af0457 38 seconds ago 215MB
docker new e3056b40acd7 10 minutes ago 267MB
centos 7 4f280dc8c807 22 hours ago 267MB

4. Create based on Dockerfile

A Dockerfile is a file consisting of a set of instructions.

File structure:

Base image information
Maintainer information
Mirror operation instructions
Execute instructions when the container starts

Dockerfile supports one instruction per line. Each instruction can carry multiple parameters and supports comments starting with "#".

Dockerfile operation instructions:

instruction	explain
FROM image	Specifies the image on which the new image is based. The first instruction must be the FROM instruction.
MAINTAINER NAME	Describe the maintainer information of the new image
RUN Command	Execute commands on the image based on it and submit it to the new image
CMD ["Program to run","Parameter 1,"Parameter 2"]	The command or script to be run when the instruction starts the container. Dockerfile can only have one CMD command. If multiple commands are specified, only the last one will be executed.
EXPOSE port number	Expose the mirror port number to facilitate mapping to external nodes when running the mirror and providing services
ENV environment variable value	Set the value of an environment variable, which will be used by the following RUN
ADD source file/directory target file/directory	Copy the file from the host to the container. If it is a compressed package and decompress it, the source file should be in the same directory as the Dockerfile
COPY source file/directory target file/directory	Copy the files/directories on the local host to the target location. The source files/directories should be in the same directory as the Dockerfile.
VOLUME ["Directory"]	Create a mount point in the container
USERUsername/UID	Specify the user to run the container
WORKDIR path	Specify the working directory for subsequent RUN, CMD, and ENTRYPOINT, equivalent to cd
ONBUILD Commands	Specifies the command to run when the generated image is used as a base image
HEALTHCHECK	Health Check

Examples

[root@server1 ~]# mkdir apache #Create a mirror directory [root@server1 ~]# cd apache/

#Create Dockerfile
[root@server1 apache]# vi Dockerfile 
FROM centos:7 #Based on the base image, run in the centos kernel MAINTAINER this is zzf web #Maintainer information RUN yum -y update  
RUN yum -y install httpd
EXPOSE 80 #Open port 80 for external mapping ADD index.html /var/www/html/index.html #Add the host website file to the image ADD run.sh /run.sh #Copy the execution script to the image RUN chmod 755 /run.sh #Elevate privileges CMD ["/run.sh"] #Execute the script when starting the container and start the Apache service #Create index.html and run.sh in the current directory
[root@server1 apache]# vi run.sh 
#!/bin/bash
rm -rf /run/httpd/* 
exec /usr/sbin/apachectl -D FOREGROUND #Start the service when starting the container [root@server1 apache]# vi index.html 
hello

#To create an image, you must be in the directory where the Dockerfile is currently located. Note that the space plus . represents the current directory [root@server1 apache]# docker build -t http:centos .
#View the created image [root@server1 apache]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
http centos 5db0e8103d54 5 minutes ago 539MB
daoke new 61b2d8af0457 33 minutes ago 215MB
docker new e3056b40acd7 43 minutes ago 267MB
centos 7 4f280dc8c807 22 hours ago 267MB

#Run the image as a container -p is the mapping port, map the container port 80 to the host port 1212 (must be unoccupied)
-P does not specify the node port, randomly assigns the port, and the default allocation starts from port 32168 [root@server1 apache]# docker run -d -p 1212:80 http:centos  

#View container status [root@server1 apache]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
a8fa8ae6be42 http:centos "/run.sh" 3 minutes ago Up 3 minutes 0.0.0.0:1212->80/tcp xenodochial_franklin
86cf506635da centos:7 "/bin/bash" 48 minutes ago Up 48 minutes nervous_shockley

Disable the firewall and test the Apache service

insert image description here

This is the end of this article about how to use dockerfile to create an apache image. For more information about how to use dockerfile to create an image, please search for previous articles on 123WORDPRESS.COM or continue to browse the following related articles. I hope you will support 123WORDPRESS.COM in the future!

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How to create Apache image using Dockerfile

Table of contents

1. Docker Image

2. Create an instance based on an existing image

3. Create based on local template

4. Create based on Dockerfile

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