Docker's Learning Notes

Posted by sarika on Sat, 04 Dec 2021 00:10:37 +0100

Overview of Docker

Why does Docker appear?

One product: development-online environment! Application Environment, Application Configuration!

Development - Operations and Maintenance. Question: I can run on my computer! Version update, rendering the service unavailable! For operations and maintenance, the test is very big?

Environment configuration is cumbersome, and every machine has to deploy the environment (cluster Redis, ES, Hadoo...! Time consuming and laborious).

Publish a project ** (jar+ (Redis MySQL JDK ES)**, can all projects be packaged with environment installation?

Previously, configuring an application environment on the server, Redis MySQL jdk ES Hadoop, was too cumbersome to be cross-platform.

Windows, and finally to Linux!

Traditionally: Develop jar, run and maintain it!

Now: Develop packaged deployment online, a set of processes completed!.

java-apk-publish (app store) - Zhang San uses apk-install is available!

java - jar - Package project with environment (mirror) -- -- (Docker repository: store) -- Download our published mirror - run it directly!

Docker offers solutions to the above problems!

Docker's ideas come from containers!

JRE - Multiple Applications (Port Conflict) - Originally Crossed!

Isolation: Docker's core idea! Pack and pack! Each box is isolated from each other.

Docker makes the most of your server through isolation!

Docker History

In 2013, Docker Open Source!

More and more people are discovering the benefits of Docker! It's on fire, Docker updates every month!

On April 9, 2014, Docker 1.0 was released!

Why is Docker so hot? Very light!

We used virtual machine technology before container technology came out!.

Virtual Machine: Install a Vmware in Windows, through which we can virtual out one or more computers! Heavy!

Virtual machine is also a virtualization technology, Docker container technology, is also a virtualization technology!

vm : 1inux centos Native Mirror(A computer! )Isolation, multiple virtual machines need to be turned on!How many? G A few minutes

docker:Isolation, mirroring(Core Environment 4 m + jdk + mysq1) Very compact, just run the mirror !Compact!How many? M KB Seconds start

Talk about Docker

Docker is based on Go Language! Open Source Project!

Official website: https://www.docker.com/

Document address: https://docs.docker.com/ Docker's documentation is super detailed!

Warehouse address: https://hub.docker.com/

What can Docker do?

Disadvantages of virtual machine technology:

High resource usage
Too many redundant steps
Start very slowly!

Containerization Technology

Containerized technology is not a complete operating system for simulation

[External chain picture transfer failed, source station may have anti-theft chain mechanism, suggest saving pictures and uploading them directly (img-5Xe3PmUi-1638817) (C:UsersTang SanAppDataRoamingTyporatypora-user-imagesdocker)]Containerization technology.png)

Compare Docker with virtual machine technology:

A traditional virtual machine that virtualizes a piece of hardware, runs a complete operating system, and then installs and runs software on it
Applications inside containers run directly on the host's content. Containers do not have their own cores or virtual hardware, so they are lightweight
Each container is isolated from each other, and each container has its own file system that does not affect each other. |

DevOps (Development, Operations)

Apply faster delivery and deployment

Tradition: a bunch of help documents, Installers

Docker: Package Mirror Publish Test, run at one click

Easier upgrade and expansion

After using Docker, we deploy the app just like building blocks!

Package the project as a mirror to extend Server A! Server B

Simpler System Operations

After containerization, our development and testing environments are highly consistent.

More efficient use of computing resources

Docker is a kernel-level virtualization that can run many container instances on another physical machine! Server performance can be squeezed to the extreme.

Docker Installation

Basic composition of Docker

Image:

The docker image is like a template through which container services can be created. The Tomcat image ==> run ==> tomcat01 container (provider server),

This mirror allows you to create multiple containers (where the final service runs or the project runs).

Containers:

Docker uses container technology to run one or a group of applications independently, created by mirroring.

Start, stop, delete, basic commands!

You can now think of this container as a simple linux system

Repository:

The warehouse is where the mirror is stored!

Warehouses are divided into public warehouses and private warehouses!

Docker Hub (default is foreign)

Ali...all have container servers (Configure Mirror Acceleration!)

Install Docker

# View the version of the system
[root@iZbp1f9ue9eymyuo11dxrlZ /]# cat /etc/os-release

NAME="CentOS Linux"
VERSION="7 (Core)"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="7"
PRETTY_NAME="CentOS Linux 7 (Core)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:7"
HOME_URL="https://www.centos.org/"
BUG_REPORT_URL="https://bugs.centos.org/"

CENTOS_MANTISBT_PROJECT="CentOS-7"
CENTOS_MANTISBT_PROJECT_VERSION="7"
REDHAT_SUPPORT_PRODUCT="centos"
REDHAT_SUPPORT_PRODUCT_VERSION="7"

install

Help Documentation:

# 1. Uninstall old versions
yum remove docker \
                  docker-client \
                  docker-client-latest \
                  docker-common \
                  docker-latest \
                  docker-latest-logrotate \
                  docker-logrotate \
                  docker-engine

# 2. Installation packages required
yum install -y yum-utils

# 3. Set up mirrored warehouses
yum-config-manager \
    --add-repo \
    https://download.docker.com/linux/centos/docker-ce.repo #Default is foreign
    
    
yum-config-manager \
   --add-repo \
    http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo #Domestic mirroring recommended, faster
  
# Update yum package index
yum makecache fast
    
# 4. Install Docker Engine docker-ce Community ee Enterprise Edition
yum install docker-ce docker-ce-cli containerd.io # This is the latest version installed by default
sudo yum install docker-ce-19.03.8 docker-ce-cli-19.03.8 containerd.io # Install the corresponding version, centos7, I'm using 19.03.8

# 5. Start Docker
systemctl start docker

# 6. Check the version to see if the installation was successful
docker version

# 7. Hello-word uses hello-world to test, if timed out, to change to a domestic mirror
docker run hello-world

# 8. View all mirrors
docker images

Uninstall Docker

# 1. Uninstall dependency
yum remove docker-ce docker-ce-cli containerd.io

# 2. Delete resources
rm -rf /var/lib/docker

# Default working path for/var/lib/docker docker

HelloWorld process

Run's flow analysis diagram (docker run image)

Underlying principle

What does Docker do?

Docker is a Client-Server architecture with a daemon running on the host. Access from client via Socket!

DockerServer receives instructions from Docker-Client and executes them!

Why is Docker faster than VM?

Docker has fewer abstraction layers than virtual machines.
The docker utilizes the host's kernel, and the vm needs to be Guest OS.

So when you create a new container, docker does not need to reload an OS kernel like a virtual machine to avoid booting. The virtual machine is loading GuestOS, minute
Clock level, and docker is using the host's operating system, omitting this complex process, second level! |

Common Docker Commands

Help Command

docker version 			# Version information for docker
docker info				# Displays docker system information, including the number of mirrors and containers
docker (command) --help	   # Help Command

Address of the help document: https://docs.docker.com/engine/reference/commandline/

Mirror Command

docker images: view all mirrors on this machine

[root@iZbp1f9ue9eymyuo11dxrlZ /]# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
hello-world         latest              feb5d9fea6a5        8 weeks ago         13.3kB

#explain
REPOSITORY	Mirrored warehouse source(Mirror Name)
TAG			Mirror Label
IMAGE ID	mirrored id 
CREATED		Creation time of mirror
SIZE		The size of the mirror

# Optional
-a , --all				# List all mirrors
-q , --quiet			# Show only the id of the mirror

docker search mirror name: the search mirror corresponds to the mirror of the official website

[root@iZbp1f9ue9eymyuo11dxrlZ /]# docker search mysql

[root@iZbp1f9ue9eymyuo11dxrlZ /]# docker search mysql --filter=STARS=3000 # Mirror of stars>3000

docker pull mirror name: download mirror

[root@iZbp1f9ue9eymyuo11dxrlZ /]# docker pull mysql
Using default tag: latest   # If you don't write tag s, the default is latest's latest version
latest: Pulling from library/mysql
a10c77af2613: Pull complete   # Hierarchical download, docker image's core federated file system
b76a7eb51ffd: Pull complete 
258223f927e4: Pull complete 
2d2c75386df9: Pull complete 
63e92e4046c9: Pull complete 
f5845c731544: Pull complete 
bd0401123a9b: Pull complete 
3ef07ec35f1a: Pull complete 
c93a31315089: Pull complete 
3349ed800d44: Pull complete 
6d01857ca4c1: Pull complete 
4cc13890eda8: Pull complete 
Digest: sha256:aeecae58035f3868bf4f00e5fc623630d8b438db9d05f4d8c6538deb14d4c31b # autograph
Status: Downloaded newer image for mysql:latest
docker.io/library/mysql:latest # Real Address

#Equivalent to it
docker pu11 mysq1
docker pu11 docker.io/1ibrary/mysq1:latest

# Specified version download
[root@iZbp1f9ue9eymyuo11dxrlZ /]# docker pull mysql:5.7 guarantees a corresponding version in the repository
5.7: Pulling from library/mysql
a10c77af2613: Already exists 
b76a7eb51ffd: Already exists 
258223f927e4: Already exists 
2d2c75386df9: Already exists 
63e92e4046c9: Already exists 
f5845c731544: Already exists 
bd0401123a9b: Already exists 
2724b2da64fd: Pull complete 
d10a7e9e325c: Pull complete 
1c5fd9c3683d: Pull complete 
2e35f83a12e9: Pull complete 
Digest: sha256:7a3a7b7a29e6fbff433c339fc52245435fa2c308586481f2f92ab1df239d6a29
Status: Downloaded newer image for mysql:5.7
docker.io/library/mysql:5.7

**docker rmi mirror name/ID: delete mirror**

# Generally deleted by id, because the mirror name may be the same (version is different)
docker rmi -f 8b43c6af2ad0 # -f Forced Delete
docker rmi -f container id container id  # Delete Multiple Mirrors
docker rmi -f $(docker images -aq) # Delete all containers

Container commands

Description: Create a container with a mirror to download a centos for testing

docker pull centos # Download centos image

New Container and Start

docker run [Optional parameters] image 


#Parameter Description
--name="Name'Container name tomcat01 tomcat02， Used to distinguish containers
-d					Run in background mode
-it					Run interactively, enter the container to view the contents
-P					Specify the port of the container-p8080: 8080
	-p ip:Host Port:Container Port
	-p Host Port:Container Port (Common)
	-p Container Port
	Container Port
-P					Randomly specified port


# Test, start and enter container
[root@iZbp1f9ue9eymyuo11dxrlZ /]# docker run -it centos /bin/bash
[root@74629498e41d /]# 
[root@74629498e41d /]# ls    # Looking at centos inside the container, the base version, many commands are imperfect!
bin  dev  etc  home  lib  lib64  lost+found  media  mnt  opt  proc  root  run  sbin  srv  sys  tmp  usr  var
[root@74629498e41d /]# exit  # Exit Container Command Exit to Host

List all running containers

# docker ps 			 List running containers
# Docker PS-A 			 List all containers that have been run (running + closed containers)
# Docker ps-a-n=1 Lists recently run containers-n=1 indicates a recently run container-n=2 indicates two recently run containers
# Docker ps-aq Lists all running containers-q to show only the number of the container

Exit Container

exit 		 # Container stops directly and exits
Ctrl + P + Q # Container does not stop exiting

Delete Container

docker rm container id    			       # Deleting the specified container does not delete the running container, forcing deletion-f
docker rm -f $(docker ps -aq)    	# Delete all containers
docker ps -a -q |xargs docker rm 	# Delete all containers

Start and Stop Containers

docker start container id 			# Start Container
docker restart container id			# Restart Container
docker stop container id			# Stop the currently running container
docker kill container id			# Force stop of currently running container

Other Commands in Common Use

Background Launch Command

# Docker run-d mirror name
[root@iZbp1f9ue9eymyuo11dxrlZ /]# docker run -d centos   # Background boot centos
34bcd5c841bbf930aeb47d047e1fcc2713f72754deb2c6fac36ffc87e1c4dd82

#Problem docker ps, centos stopped
#Common pits. The docker container runs in the background and must have a foreground process. When docker finds no application, it stops automatically
# nginx, when the container starts up and finds itself not servicing, it stops immediately, or there is no program

view log

 # Docker logs-tf container id view all logs--tail n stands for n logs only
docker logs -tf --tail 5  bcb03d79aee3

View the container's entry information

# docker top container id

[root@iZbp1f9ue9eymyuo11dxrlZ /]# docker top bcb03d79aee3
UID                 PID                 PPID                C                   STIME               TTY                 TIME                CMD
root                27904               27889               0                   20:09               ?                   00:00:00            /bin/bash

View container metadata

# docker inspect container id

Enter the currently running container

# This is when exit exits the container, for example, after exit centos, enters the container again or when running in the background
docker exec -it container id /bin/bash    # Open a new terminal after entering the container to operate inside
docker attach container id 				  # Enter the terminal that the container is executing and will not start a new process

Copy files from container to host

docker cp container id:In-Container Path Destination Host Path     Copying is a manual process, You can use it later-v Volume Technology,Implementable,Automatic Synchronization

Homework exercises

Docker Install Ngnix

# 1. Search Mirror
# 2. Download Mirror
# 3. Run tests

# -d 		 Background running
#--name 	 Name the container
# -p host port: container internal port
[root@kuangshen home]# docker run -d --name nginx01 -p 3344:80 nginx

# Enter Container
[root@iZbp1f9ue9eymyuo11dxrlZ docker]# docker exec -it nginx01 /bin/bash
root@7fd1a7dbb5b5:/# whereis nginx
nginx: /usr/sbin/nginx /usr/lib/nginx /etc/nginx /usr/share/nginx
root@7fd1a7dbb5b5:/# cd /etc/nginx
root@7fd1a7dbb5b5:/etc/nginx# ls
conf.d	fastcgi_params	mime.types  modules  nginx.conf  scgi_params  uwsgi_params
root@7fd1a7dbb5b5:/etc/nginx#

Think about it: Do we need to go inside the container every time we change the nginx configuration file? Very cumbersome, if I could provide a mapping path outside the container to get there
Does the container modify the file name so that it can be automatically modified inside the container? - v Data Volume

Docker installs a Tomcat

#Official Use
docker run -it --rm tomcat:9.0

#Our previous startups were all in the background, after stopping the container, the container can still be found docker run -it --rm # Usually for testing purposes, delete when used

# Download Start
docker pull tomcat:9.0

# Start Run
docker run -d -p 3355:8080 --name tomcat01 tomcat

# Enter Container
[root@iZbp1f9ue9eymyuo11dxrlZ /]# docker exec -it tomcat01 /bin/bash

#Problem found: 1, 1inux commands are fewer, 2. The webapps file is empty. Reasons for Ali cloud mirroring. The default is the smallest mirror, eliminating all unnecessary images.
#Ensure minimum runnable environment!

Think about it: We'll deploy the project in the future. Is it very troublesome to enter the container every time? If I could provide a mapping path outside the container, webapps,
We place items outside and synchronize to inside automatically.

Deploy es + kibana

# es exposes many ports!
# es10 consumes memory
# es data generally needs to be placed in a secure directory! mount
# --net somenetwork? Network Configuration

#Start elasticsearch
docker run -d --name elasticsearch -p 9200:9200 -p 9300:9300 -e "discovery.type=single-node"
elasticsearch:7.6.2

#Start inux and stuck docker stats to check cpu status
# es is memory intensive, 1.xG 		 1core 2G!
#View docker stats
#Testing es was successful enough

#Close now, increase memory limit, modify profile-e environment configuration modification

docker run -d --name elasticsearch02 -p 9200:9200 -p 9300:9300 -e "discovery.type=single-node" -e ES_JAVA_OPTS="Xms256m -Xmx512m" elasticsearch:7.6.2

visualization

portainer (use this first)

docker run -d -p 8088:9000 \
--restart=always -V /var/run/docker.sock:/var/run/docker.sock --privileged-true portainer/portainer

Access External/Intranet 8088

Docker Mirror

What is the mirror image?

Mirror is a lightweight, executable, stand-alone package that packages software running environments and software developed based on them and contains all the necessary components to run a software
Contains, including code, runtime libraries, environment variables, and configuration files.

All applications, just pack a docker image and run!

How to get a mirror:

Download from remote repository
Friend's copy for you
Make your own mirror DockerFile

Docker mirror loading principle

UnionFS (Federated File System)

This is the layer we see when we download it!

UnionFS: The Union File System (UnionFS) is a hierarchical, lightweight, and high performance file system that supports modifications to the file system

As a layer-by-layer overlay of submissions, different directories can also be mounted under the same virtual file system (unite several directories into a single virtual file system)

filesystem). The Union file system is the basis of Docker mirroring. Mirrors can be inherited by layers, and each can be made based on the underlying mirror (without a parent).

Specific application mirrors.

Features: Load multiple file systems at once, but from the outside, you can only see one file system. Joint loading will overlay each layer of file systems, so that the end result is

The file system will contain all the underlying files and directories

Docker mirror loading principle

The docker's mirror actually consists of a layer-by-layer file system, UnionFS.

bootfs(boot file system) mainly contains bootloader and kernel. bootloader is mainly to boot the kernel. Linux will load bootfs file system when it is just started

Generally, at the bottom of the Docker image is bootfs. This layer is the same as our typical Linux/Unix system, with boot loaders and cores. When boo loading is complete

After that, the entire kernel is in memory, and the use of memory has been transferred from bootfs to the kernel, and bootfs will be uninstalled by the system.

rootfs (root file system), on top of bootfs. These include standard directories and files such as /dev, /proc, /bin, /etc on typical Linux systems. rootfs is
Various operating system distributions, such as Ubuntu, Centos, and so on.

For a compact OS, rootfs can be very small and contain only the most basic commands, tools, and libraries, since the underlying layer uses Host's kernel directly, and only its own
You need to provide rootfs. So bootfs are basically the same for different linux distributions, rootfs are different, so different distributions can be public
bootfs.

Layered Mirror

You can see that downloads are one tier at a time

Once installed, layers will not be installed, such as Already exists above

Commit mirror

How to submit a mirror of yourself

docker commit Submit Container to a New Copy

# Commands work like GITS
docker commit  -m="Information submitted" -a="author" container id Target Mirror Name:[tag]

Field Test

#1. Start a default Tomcat

#2. Discover that this default tomcat is not a webapps application. The reason for mirroring is that there are no files underneath the official mirror default webapps!

#3.Copy in the basic files yourself!

#4. Submit containers that we have operated on to a mirror via commit! We can use the mirror we modified later. This is one of our own modified images

Container data volume

What is a container data volume?

docker's concept review

Package applications and environments into a single image!

Data? If the data is all in containers, our containers will delete and the data will be lost! Requirement: Data can be persisted

MySQL, container deleted, library deleted run! Requirement: MySQL data can be stored locally!

There can be a technology for data sharing between containers! Data generated in Docker container, sync to local!

This is volume technology! Mount directories, mount directories inside our containers onto Linux!

In a word: container persistence and synchronization! Containers can also share data!

Using data volumes

Mode 1: mount-v directly using the command

docker run -it -v Host Directory:Container contents

# test 
[root@iZbp1f9ue9eymyuo11dxrlZ home]# docker run -it -v /home/ceshi:/home centos /bin/bash
# We can use docker inspect container id when starting up

"Mounts": [
{
"Type": "bind",
"Source": "/home/ceshi",
"Destination": "/home",
"Mode": "",
"RW": true,
"Propagation": "rprivate"
}
],

Test discovery again

Stop Container
Modify Files on Host
Start Container
The data in the container is still synchronized!

Benefit: We only need local modifications for future modifications, and the container will synchronize automatically!

Install Mysql

# Get Mirror

[root@iZbp1f9ue9eymyuo11dxrlZ /]# docker pull mysql:5.7

#Run container, data mount is required! #Install Start mysq1 	 You need to configure the password, this is a point of attention!
#Official test: docker run--name mysq101-e MYSQL_ ROOT_ PASSWORD=my-secret-pw-d mysq1:tag 

# Multiple directories can be mounted at the same time, bi-directional binding
# -d:Background running 	- p:Port Mapping 		- v: Data volume mount 	- e:Environment Configuration 		-- Name:Container name
# Start your own
[root@iZbp1f9ue9eymyuo11dxrlZ /]# docker run -d -p 3310:3306 -v /home/mysql/conf:/etc/mysql/conf.d -v /home/mysql/data:/var/lib/mysql -e MYSQL_ROOT-PASSWORD=123456 --name mysql01 mysql:5.7

# After successful startup, you can use sqlyog tests locally
# sqlyog-3310 connected to server and 3306 mapping inside container, then we can connect!

Suppose container is deleted

We found that the volume we mounted locally is still not lost, which enables container data persistence!

Anonymous and Anonymous Mounts

# Usually mounted with a name

-V	Path inside container			   #Anonymous mount
-V  Volume Name:Path inside container		  #Named Mount     
-V  /Host Path:Path inside container	#Specify the path to mount!

extend

#Change read and write permissions ro through -V container path: ro rw
readonly 		# Read-only rW
readwrite 		#Read-write

#Once this setting sets container permissions, containers limit what we can mount!
docker run -d -P --name nginx02 -V juming-nginx:/etc/nginx:ro nginx
docker run -d -P --name nginx02 -V juming-nginx:/etc/nginx:rw nginx

First Identity Dockerfile

A modified container was originally submitted through commit and then mirrored

Dockerfile is the build file used to build the docker image! Command script! Experience it first!

Through this script, mirrors can be generated one layer at a time, scripts commands one by one, each command is one layer!

#Create a dockerfile with a name that randomly suggests a Dockerfile
#Content directive (uppercase) parameters in file

FROM centos
VOLUME ["volume01" ，"volume02"]
CMD echo "----end-----"
CMD /bin/bash
#Every command here is the mirror floor!

# -f is built from which file
[root@iZbp1f9ue9eymyuo11dxrlZ docker-test-volume]# docker build -f dockerfile -t kuangshen/centos:1.0 .

# image after successful build
[root@iZbp1f9ue9eymyuo11dxrlZ docker-test-volume]# docker images
REPOSITORY            TAG                 IMAGE ID            CREATED             SIZE
kuangshen/centos      1.0                 710cd474d3b2        4 seconds ago       231MB

# Start Container
docker run -it image id

There must be a synchronized directory outside this volume!

Data Volume Container

Synchronize data with multiple mysql s!

# --Mount between volumes-front containers
[root@iZbp1f9ue9eymyuo11dxrlZ docker-test-volume]# docker run -it --name docker02 --volumes-from docker01 kuangshen/centos:1.0

Essentially, docker01 and 02 point to the address of the host, so delete docker01 and docker02 will have data.

Dockerfile

Introduction to Dockerfile

The dockerfile is the file used to build the docker image! Command parameter script

Construction steps:

Write a dockerfile
Docker builds into a mirror
docker run run mirror
docker push releases mirror (DockerHub, Ali Cloud Mirror Warehouse)

Many of the official mirrors are basic packages and many of the functions are not available. We usually set up our own mirrors!

Dockerfile build process

Fundamentals:

Each reserved keyword (instruction) must be an uppercase letter
Execute from top to bottom
#indicates a comment
Each instruction creates and submits a new mirror layer!

Dockerfile is for development, publishing projects, mirroring, dockerfile needs to be written

Step: Develop, deploy, operate and maintain...

DockerFile: Build a file, define all the steps, source code

Dockerlmages: Build a generated image through DackerFile, and ultimately publish and run the product!

Docker container: A container is a mirror that runs to provide a server

Dockerfile directive

FROM		#Basic Mirror, everything built from here
MAINTAINER	#Who wrote the mirror, name + mailbox
RUN			#Commands to run when building a mirror
ADD			#Step: tomcat mirror, this tomcat compressed package! Add Content
WORKDIR		#Mirrored Working Directory
VOLUME		#Mounted Directory
EXPOSE		#Keep Port Configuration
CMD			#Specifies the command to run when this container starts. Only the last one will take effect and can be replaced
ENTRYPOINT	#You can append commands by specifying which commands to run when this container starts
ONBUILD		#When an inherited DockerFile is built, the ONBUILD directive is run. Trigger command.
COPY		#Like ADD, copy our files into a mirror
ENV			#Set environment variables when building

Field Test

Create your own centos

# 1. Write dockerfile

[root@iZbp1f9ue9eymyuo11dxrlZ dockerfile]# cat mydockerfile-centos
FROM centos
LABEL "author"="zhangchuan"
LABEL "email"="1581546384@qq.com"

ENV MYPATH /usr/local
WORKDIR $MYPATH

RUN yum -y install vim
RUN yum -y install net-tools

EXPOSE 80 

CMD echo &MYPATH
CMD echo "----end----"
CMD /bin/bash

# 2. Build a mirror from this file
#Command docker build-f dockerfile file file path-t mirror name: [tag]
[root@iZbp1f9ue9eymyuo11dxrlZ dockerfile]# docker build -f mydockerfile-centos -t mycentos:1.0 .

Successfu1ly built e2bd75cfe070
Successfu1ly tagged mycentos :0.1


# 3. Test Run
 Native centos No,  pwd,vim These commands,Self-built centos These commands were added

docker history  image id	# View the construction of the mirror

Get a mirror and you can study the whole process of building it!

Difference between CMD and ENTRYPOINT

CMD				#Specifies the command to run when this container starts. Only the last one will take effect and can be replaced
ENTRYPOINT		#You can append commands by specifying which commands to run when this container starts

Actual Warfare: Tomcat Mirror

Prepare a tomcat zip package for the mirror file, a jdk zip package!
Write a dockerfile in uppercase Dockerfile (official command: recommendation). build will automatically look for this file without specifying -f!

FROM centos
LABEL "author"="zhangchuan"
LABEL "email"="1581546384@qq.com"

COPY readme.txt /usr/local/readme.txt 

ADD jdk-8u311-linux-x64.tar.gz /usr/local/
ADD apache-tomcat-8.5.72.tar.gz /usr/local/

RUN yum -y install vim
ENV MYPATH /usr/local
WORKDIR $MYPATH 

ENV JAVA_HOME /usr/local/jdk1.8.0_311
ENV CLASSPATH $JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
ENV CATALINA_HOME /usr/local/apache-tomcat-8.5.72
ENV CATALINA_BASH /usr/local/apache-tomcat-8.5.72
ENV PATH $PATH:$JAVA_HOME/bin:$CATALINAHOME/1ib:$CATALINA_HOME/bin

EXPOSE 8080

CMD /usr/Local/ apache- tomcat-8.5.72/bin/startup.sh && tail -F /url/local/apache-tomcat-8.5.72/bin/logs/catalina.out

# 3. Start your own mirror
docker run -d  -p:9090:8080 --name kuangshentomcat -v /home/kuangshen/build/tomcat/test:/url/local/apache-tomcat-8.5.72/webapps/test -v /home/kuangshen/build/tomcat/tomcatlogs/:/url/local/apache-tomcat-8.5.72/logs diytomcat

Publish your own image

DockerHub

address https://hub.docker.com/ Register your own account!
Make sure this account is logged in
Submit your own image on our server
Once you've logged in, you can submit a mirror, which is a docker push

[root@kuangshen tomcat]# docker tag f8559daf1fc2 kuangshen/tomcat:1. 0

Can also be published to Ali Cloud Mirror

SpringBoot Micro Services Package Docker Mirrors

Technological process

Architecture springboot project
Packaging applications
Write dockerfile
Build Mirror
Publish Run!

actual combat

Package the project into a jar package

Write Dockerfile

Upload to remote server via Xftp

Use Xshell to open to the file directory where the jar package was uploaded and build a mirror

Running Project Mirror
If you need MySQL in your project, you need to use Docker to pull the MySQL image and run it

Project database address also needs to be changed to remote address

Utilize local testing of remote MySQL services

Then add the database corresponding to the project and import the corresponding sql script!!
Successfully accessed the project, sql script has not been imported yet, so there is no data public network Ip+port number for now

Source: Meet the gods, Docker teaching video
Video link: Docker's latest ultra-detailed tutorial is easy to understand.

Topics: Operation & Maintenance Docker

Programmer Think

Docker's Learning Notes

Overview of Docker

Why does Docker appear?

Docker History

What can Docker do?

Docker Installation

Basic composition of Docker

Install Docker

HelloWorld process

Underlying principle

Common Docker Commands

Help Command

Mirror Command

Container commands

Other Commands in Common Use

Homework exercises

Docker Mirror

What is the mirror image?

Docker mirror loading principle

Commit mirror

Container data volume

What is a container data volume?

Using data volumes

Install Mysql

Anonymous and Anonymous Mounts

First Identity Dockerfile

Data Volume Container

Dockerfile

Introduction to Dockerfile

Dockerfile build process

Dockerfile directive

Field Test

Actual Warfare: Tomcat Mirror

Publish your own image

SpringBoot Micro Services Package Docker Mirrors

Technological process

actual combat

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