Build on a clean CentOS image Centos image preparation Pull the Centos image on the virtual machine: docker pull centos Create a container to run the Centos image: docker run -it -d –name mycentos centos /bin/bash Note: There is an error here [ WARNING: IPv4 forwarding is disabled. Networking will not work. ] Change the […]

Docker installation builds Tomcat + MySQL virtual machine Virtual machine installation Docker Build on a clean CentOS image Centos image preparation Pull the Centos image on the virtual machine: docker pull centos Create a container to run the Centos image: docker run -it -d –name mycentos centos /bin/bash Note: There is an error here [ […]

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 […]

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 […]

[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 […]

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 […]

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 interfaces […]

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/id_rsa.pub. 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: […]

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 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 […]