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COPY and ADD commands in Dockerfile

COPY and ADD commands in Dockerfile

Two very similar commands COPY and ADD are provided in the Dockerfile. This article attempts to explain the basic functions of these two commands, as well as their similarities and differences, and then summarize their respective suitable application scenarios.

Build context concept When you create a mirror from a […]

Docker to build a Tomcat runtime environment

1 Prepare the host system

Prepare a CentOS 7 operating system with the following specific requirements:

Must be a 64-bit operating system. The kernel is above 3.8 to view your CentOS kernel with the following command:

# uname -r

2 Install Docker

# yum install docker Use the following command to see if Docker is […]

docker centos

[root@ docker]# cat /etc/yum.repos.d/docker-main.repo [docker-main-repo] name=Docker main Repository baseurl= enabled=1 gpgcheck=1 gpgkey=

[root@ docker]# yum install docker-engine –y

[root@ docker]# docker –version Docker version 17.05.0-ce, build 89658be

firewall-cmd –add-port=2377/tcp –permanent

firewall-cmd –add-port=7946/tcp –permanent

firewall-cmd –add-port=7946/udp –permanent

firewall-cmd –add-port=4789/udp –permanent

firewall-cmd –reload**

[root@ docker]# cat /etc/docker/daemon.json { “insecure-registries”:[“”], “log-driver”:”json-file”, “log-opts”:{“max-size”:”1024m”,”max-file”:”2″} }

[root@ ~]# systemctl restart docker.service


Detailed Docker container common operations

First, start the container

There are two ways to start a container. One is to create a new container based on the image and start, and the other is to restart the container in the terminated state.  Because Docker’s containers are too lightweight, users often delete and recreate containers at any time.

New and start


CentOS 7 Installs Docker Application Container Engine

Docker is an open source application container engine based on the  Go language  and open sourced under the Apache 2.0 protocol.

Docker allows developers to package their applications and dependencies into a lightweight, portable container that can then be published to any popular Linux machine or virtualized.

Containers are completely sandboxed and do not have any […]

ANSIBLE Practice

ANSIBLE Practice Ansible-palybooks

root@controller:~$ ssh-keygen Generating public/private rsa key pair. Enter file in which to save the key (/home/root/.ssh/id_rsa): Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /home/root/.ssh/id_rsa. Your public key has been saved in /home/root/.ssh/ The key fingerprint is: 33:b8:4d:8f:95:bc:ed:1a:12:f3:6c:09:9f:52:23:d0 root@controller The key’s randomart image is: […]

kubernetes centos7.3

Last login: Thu Mar 1 00:45:37 2018 from [root@clusterserver1 ~]# uname -a Linux 3.10.0-693.17.1.el7.x86_64 #1 SMP Thu Jan 25 20:13:58 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux [root@clusterserver1 ~]#

Master : Worker1 : Worker2 : worker3 :

hostnamectl set-hostname ‘’ exec bash setenforce 0 sed -i –follow-symlinks ‘s/SELINUX=enforcing/SELINUX=disabled/g’ /etc/sysconfig/selinux

[root@clusterserver1 […]

docker swarm

Docker Engine Starting from version 1.12.0, Docker Swarm is integrated natively. The operation of the cluster can be directly controlled by the docker service command, which is very convenient and the operation process is greatly simplified. Docker Swarm For the average developer, the biggest advantage lies in the native support of the load balancing mechanism, which […]

Docker import and export mirrors

Docker Import and Export Image Docker allows you to export the image to a local file. The export command is docker save. First, let’s look at the use of this command. [plain] view plain copy $ sudo docker save –help

You can see that the docker save command is very simple to use, with a […]

Docker centos 6.9

Docker requires a Linux kernel version of 3.8 or higher, you must check the kernel version of the host operating system before installation. Otherwise, if the kernel is lower than 3.8, Docker can be successfully installed, but after entering Docker, it will automatically exit. .

1. Download and install CentOS 6.9

CentOS 6 series, the latest version […]