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 […]

[root@ docker]# cat /etc/yum.repos.d/docker-main.repo [docker-main-repo] name=Docker main Repository baseurl=https://get.daocloud.io/docker/yum-repo/main/CentOS/7 enabled=1 gpgcheck=1 gpgkey=https://get.daocloud.io/docker/yum/gpg

[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”:[“docker-registry.rmohan.com:5000”], “log-driver”:”json-file”, “log-opts”:{“max-size”:”1024m”,”max-file”:”2″} }

[root@ ~]# systemctl restart docker.service

[…]

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 […]

Last login: Thu Mar 1 00:45:37 2018 from 192.168.1.248 [root@clusterserver1 ~]# uname -a Linux clusterserver1.rmohan.com 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 : 192.168.1.20 Worker1 : 192.168.1.21 Worker2 : 192.168.1.23 worker3 : 192.168.1.24

hostnamectl set-hostname ‘clusterserver1.rmohan.com’ exec bash setenforce 0 sed -i –follow-symlinks ‘s/SELINUX=enforcing/SELINUX=disabled/g’ /etc/sysconfig/selinux

[root@clusterserver1 […]

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 […]