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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/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: […]

kubernetes centos7.3

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 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 […]

Docker creates Tomcat/Weblogic cluster

Install Tomcat image

Prepare the required jdk, tomcat and other software into the home directory, start a container docker run -t -i -v /home:/opt/data -name mk_tomcat Ubuntu /bin/bash

This command mounts the local home directory to the /opt/data directory of the container. If the container directory does not exist, it will be automatically created. The next step is […]

Docker Swarm on Centos 7

Install of docker

Lets remove all the unnecessary software on the machine

yum remove docker docker-client docker-client-latest docker-common docker-latest docker-latest-logrotate docker-logrotate docker-selinux docker-engine-selinux docker-engine

now we have to install dependancy software for Docker

yum install -y yum-utils device-mapper-persistent-data lvm2

Let add a docker repo

yum-config-manager –add-repo https://download.docker.com/linux/centos/docker-ce.repo

Enable the yum docker repo on the centos […]

Start a docker container on CentOS at boot time as a linux service

Note: If docker daemon does not start at boot, you might want to enable the docker service

1 systemctl enabledocker.service

Here are the steps.

Create the file /etc/systemd/system/docker_demo_container.service

1 2 3 4 5 6 7 8 9 10 11 [Unit] Wants=docker.service After=docker.service [Service] RemainAfterExit=yes ExecStart=/usr/bin/dockerstart my_container_name ExecStop=/usr/bin/dockerstop my_container_name [Install] WantedBy=multi-user.target

Now I can start […]

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