Getting started with deops

DevOps What is it? ？

DevOps, Literally means Development &Operations Abbreviation , That's development & Operation and maintenance .

Software development process

The overall software development process includes ：

• PLAN： The development team makes the development plan according to the customer's goals
• CODE： according to PLAN Start the coding process , You need to store different versions of code in a library .
• BUILD： After coding , You need to build and run the code .
• TEST： After successfully building the project , You need to test whether the code exists BUG Or error .
• DEPLOY： After manual and automated testing of the code , Confirm that the code is ready to be deployed and handed over to the operation and maintenance team .
• OPERATE： The operation and maintenance team deploys the code into the production environment .
• MONITOR： After the project is deployed online , Need continuous monitoring of products .
• INTEGRATE： Then send the feedback received in the monitoring phase back to PLAN Stage , The whole iterative process is DevOps At the heart of , That is to say, to continue to integrate into 、 Continuous deployment .
  

CI/CD

CI/CD It can be understood as ：

• CI The process is through Jenkins Pull the code 、 structure 、 Make an image and give it to the tester to test .
  • Continuous integration ： So that the software code can be continuously integrated into the backbone , And automatically build and test .
• CD The process is through Jenkins Pull the labeled release code 、 structure 、 Make the image and hand it to the operation and maintenance personnel for deployment .
  • Continuous delivery ： Allow continuously integrated code to be deployed manually .
  • Continuous deployment ： Automated deployment of continuously deliverable code anytime, anywhere .

1) coder Put the code push To gitlab Warehouse 
2)jenkins take gitlab Pull the warehouse code , plug-in unit maven Used to build , The code is packaged into an application 
3）jenkis Put the program push To the server environment , With docker How to run .

Tool introduction and environment deployment

docker Environmental preparation

yum -y install yum-utils device-mapper-persistent-data lvm2
yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
yum -y install docker-ce
systemctl start docker
systemctl enable docker
docker version

sudo mkdir -p /etc/docker
sudo tee /etc/docker/daemon.json <<-'EOF' { "exec-opts": ["native.cgroupdriver=systemd"], "registry-mirrors": ["https://du3ia00u.mirror.aliyuncs.com"], "live-restore": true, "log-driver":"json-file", "log-opts": {"max-size":"500m", "max-file":"3"}, "max-concurrent-downloads": 10, "max-concurrent-uploads": 5, "storage-driver": "overlay2" } EOF

sudo systemctl daemon-reload
sudo systemctl restart docker


curl -L https://get.daocloud.io/docker/compose/releases/download/1.29.2/docker-compose-`uname -s`-`uname -m` > /usr/local/bin/docker-compose
chmod 777 /usr/local/bin/docker-compose
sudo ln -s /usr/local/bin/docker-compose /usr/bin/docker-compose
docker-compose -version
chmod a+x docker-compos

Code Stage

gitlab install

docker search gitlab
docker pull gitlab/gitlab-ce
[[email protected] gitlab]# cat docker-compose.yml 
version: '3.7'
services:
  gitlab:
    image: gitlab/gitlab-ce 
    container_name: gitlab
    restart: always
    environment:
      GITLAB_OMNIBUS_CONFIG: |
        external_url 'http://192.168.3.80:8929'
        gitlab_rails['gitlab_shell_ssh_port'] = 2224
    ports:
      - '8929:8929'
      - '2224:2224'
    volumes:
      - './config:/etc/gitlab'
      - './logs:/var/log/gitlab'
      - './data:/var/opt/gitlab'
docker-compose up -d
docker exec -it gitlab cat /etc/gitlab/initial_root_password

git Use

git add .
git commit -m 'update'
git push -u origin --all

Integrate Tools

jenkins install

[[email protected]_host81 docker-jenkis]# cat docker-compose.yml 
version: "3"
services:
  jenkins:
    image: jenkins/jenkins:lts-jdk11
    container_name: jenkins
    ports:
      - 8080:8080
      - 50000:50000
    volumes:
      - ./data/:/var/jenkins_home/


docker exec -it jenkins cat /var/jenkins_home/secrets/initialAdminPassword

Maven Environmental preparation

https://maven.apache.org/download.cgi
jdk Download address   http://www.codebaoku.com/jdk/jdk-oracle-jdk11.html

take jdk as well as maven Put it in jekins Under the directory of , In order to jenkins Can access .

Maven Set private address and jdk edition

[[email protected]_host81 conf]# ll -d settings.xml
-rw-r–r–. 1 root root 11088 7 month 2 17:27 settings.xml

<!--  Alibaba cloud image address  -->
<mirror>  
    <id>alimaven</id>  
    <name>aliyun maven</name>  
    <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
    <mirrorOf>central</mirrorOf>          
</mirror>
<!-- JDK1.8 Compile the plug-in  -->
<profile>
    <id>jdk-1.8</id>
    <activation>
        <activeByDefault>true</activeByDefault>
        <jdk>1.8</jdk>
    </activation>
    <properties>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <maven.compiler.compilerVersion>1.8</maven.compiler.compilerVersion>
    </properties>        
</profile>

Case study