Jenkins build image automatic deployment

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Preface

This article is after installation jenkins And other environments . So we need to make sure that jenkins There is... On the server maven,jdk, relation git Wait for the operation . If you need to search other documents

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One 、Jenkins What is it? ？

Baidu Encyclopedia ：
jenkins It's an open source software project , Is based on Java A continuous integration tool for development , Used to monitor continuous repetitive work , To provide an open and easy-to-use software platform , Enable continuous integration of software projects

Two 、 Three construction methods

1. New free style software project

It is recommended that front-end software applications use free style to build projects .（ No, pom.xml file ）

2.maven style

1) Build and push jar package

I use it as back-end code generation , It's also the method I use now , Use jenkins+sh The script completes the micro service construction .

hook git project , And find a valid user in the voucher , This user must participate in the management of this project . Otherwise, the project cannot be pulled .

In the parent of wechat pom Under the document , perform clean test packet Packing command , The code will be packaged one by one jar file , Position in target Under the folder .

The built operation can add multiple , Because I am a micro service, here is a specific step .
send build artifacts over ssh Pattern
Pass the constructed image through ssh send out server The server , You can select the target server .
transfers
The meaning of carrying

source files Under the workspace jar The path address of the package
Remove prefix Remove prefix , Equivalent to not generating other packages under the path
Remote directory Folders on the remote server
Exec command Final executed shell command

What I pull in my configuration is under a micro service jar Package to the specified file under the specified server , Complete my execution order , The command is cd Go to the target folder and execute sh Script

2 shell The script completes the deployment

stay exec command perform shell command , I complete automated builds by executing scripts

I use docker Running jar package , therefore , At every jar After sending to each file under the target server , By matching dockerfile To carry out bulid Mirror image . Before dockerfile I have already explained , Now just write sh Script .

 step ：1. Declare variables 
	  2. Create folders and backup folders 
	  3. Stop containers that need to be replaced 
	  4. Delete the container that needs to be replaced 
	  5. Delete the image that needs to be replaced 、
	  6. Building a new mirror 
	  7. Save the built image to the backup folder 
	  8. Manage the number of backups 
	  9. Run the new container 

The actual code ：

#/bin/bash
dir=/data/images_bak/file-parent
name=file-parent
logs=/data/logs/file-parent
port=9003   
# The above is the declared variable 
if [ ! -d "$dir" ];then
  mkdir -p $dir
else
  echo "xxxx"
fi
if [ ! -d "$logs" ];then
  mkdir -p $logs
fi
#if Determine whether the folder exists  -d  Decide if it's a folder 
date=`date +%Y%m%d%H%M%S`
# Declare variables 
docker stop `docker ps -a|grep $name|awk '{print $1}'`
docker rm `docker ps -a|grep $name|awk '{print $1}'`
docker rmi `docker images|grep $name|awk '{print $1}'`:`docker images|grep $name|awk '{print $2}'`
# Stop container remove container and image 
docker build -t $name:$date .
# Build a mirror image 
docker save > $dir/$name-$date.tar `docker images|grep $name|awk '{print $1}'`:`docker images|grep $name|awk '{print $2}'`
# Take the image as tar Save to the corresponding directory   The name is  imageName:tag
ls -t $dir/*.tar |awk 'NR>3'|xargs rm -f

docker run   -itd -p $port:$port -v $logs:/logs  --name $name $name:$date  bash
# Start the image mapping port mount directory and declare the container name 

understand ：

linux  Next shell in if Of “-e,-d,-f” What does that mean? 
 File expression 
 -e filename  If  filename There is , It is true 
 -d filename  If  filename Directory , It is true  
 -f filename  If  filename For general file , It is true 
 -L filename  If  filename Is symbolic link , It is true 
 -r filename  If  filename Can be read , It is true  
 -w filename  If  filename Can write , It is true  
 -x filename  If  filename Executable , It is true 
 -s filename  If the file length is not 0, It is true 
 -h filename  If the file is a soft link , It is true 
 filename1 -nt filename2  If  filename1 Than  filename2 new , It is true .
 filename1 -ot filename2  If  filename1 Than  filename2 used , It is true .

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summary

jenkis Automated build is not a way to build , Need to learn more , If you are an operation and maintenance personnel, you can continue to understand , Developers personally feel that knowing a construction method is enough to meet their daily work