What are docker and jenkins

Docker is an open source application container engine that can package applications and dependency packages into a portable image and then publish them to the system machine; while Jenkins is a powerful application that can handle any Type of build or continuous integration.

The operating environment of this tutorial: linux7.3 system, docker-1.13.1 version, Dell G3 computer.

What are docker and jenkins

Docker is an open source application container engine, based on the Go language and open source in compliance with the Apache2.0 protocol. Jenkins is a powerful application that allows continuous integration and continuous delivery of projects regardless of the platform used. This is a free source code that can handle any kind of build or continuous integration. Integrating Jenkins can be used for some testing and deployment techniques. Jenkins is a software that allows continuous integration.

In the early days, I installed a centos7 on my local machine, then installed docker in the virtual machine, and then pulled the jenkins image. First of all, the first pitfall that novices encountered was that the image pull got stuck in a certain place for a long time. A process will not proceed (the reason is similar to maven, because the default warehouse is a foreign server which is slower), so we can choose some domestic warehouses to pull. I used NetEase. First, you need to know the address of your mirror. For example, Jenkins is this (under the library directory)/library/jenkins:latest

Then enter the command line

docker pull hub.c.163.com/library/jenkins:latest

After downloading the image, you can view all the images

docker ps -a

Then we can start building our Jenkins workbench: (The following is the image downloaded from the official warehouse, so the last one is jenkins. If it is downloaded from NetEase, use their full name, which can be viewed in the previous step)

sudo docker run -d --name jenkins_node -p 49002:8080 -v /var/jenkins_node:/var/jenkins_home jenkins:latest

There are many parameters in this step, let me explain them (please skip it, boss...for novices) -d is to allow the jenkins container to run in the background, so that you will not hang up the service when you close the command window. --name is the name of your container (choose it casually, I almost got beaten to death when I took the name of my supervisor...) -p This maps the 8080 port of the container to 49002 so that what we access in the actual page is 49002 This address, the next step is the -v parameter. This step is very easy to step into pitfalls (at least as a person who is not familiar with Linux, I have stepped on a lot of pitfalls). This parameter is to change your server (now your virtual machine). Mount the /var/jenkins_node directory on the machine) to the /var/jenkins_home directory of the container. Please note: before running the command line in the above figure, please remember to check whether the current user has read and write rights to the /var folder. , otherwise when you are asked to enter the initial Jenkins login password, you will find that this file does not exist at all. . . How to modify file permissions in Linux? It is recommended that you Baidu

and continue to the next step: If the folder in the previous step has been generated, you can skip here.

Due to permission issues in the previous step, the /var/jenkins_node folder was not generated. At this time, we need to pause the container service first.

docker ps -a

Find the ID of the jenkins container just now and copy it to run the following operations. Proceed, container stop and delete container

docker stop (copied ID)

docker rm (copied ID)

Then repeat this step sudo docker run -d - -name jenkins_node -p 49002:8080 -v /var/jenkins_node:/var/jenkins_home jenkins:lates

Next, visit http://host:49002 in the browser, and the following interface will appear

At this time, go to the /var/jenkins_node folder you just searched for the initialAdminPassword file. Copy the initial login password and you can enter. The next step is to ask you to download the default plug-in or customize it. Definition (it is recommended that novices choose the first one directly for convenience. If you need anything later, go to the plug-in management center to download)

. After the plug-in is downloaded, your account and password will be set. This will not take a screenshot. Now you can enter your workbench to deploy your project

Recommended learning: "docker video tutorial"

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