Unix Container

Container Howto

Web Site

Docker [docker.com]

Containers at Docker Store [store.docker.com]

Install and run a container

docker run -i -t ubuntu:18:04 /bin/bash

Create an image from a container Commit

• "b5673dbced61" is an image id

docker commit -m "Ubuntu 14.10 Demonstrator" -a "Author Name" b5673dbced61 demo:14.10

List Images (Source to initiare a containers)

docker images

Remove an image "b5673dbced61" is an image id

docker rmi b5673dbced61 

Create a volume

docker volume create --name node_red_user_data

List volumes

docker volume ls

List containers (Running Virtual Machines)

• Running:

 docker ps

• Full List

 docker ps -a

Start and Stop a container

• Stop

docker stop "containerId or Name"

• Start (Batch)

docker start "containerId or Name"

• Start (and login in)

docker start -i "containerId or Name"

Update a restart option

• no
• on-failure
• unless-stopped
• always

docker update --restart=on-failure <container>

"Relogin" (Attach) into a Container

• "Relogin into a running container

docker attach "container Name"

Save an image

• "asw20/mailserver" is the image tag

docker save asw20/mailserver:latest -o mailserver.tar

Save all images

docker save $(docker images | sed '1d' | awk '{print $1 ":" $2 }') -o dockerimages.tar

Restore image

docker load -i dockerimages.tar

Remove a container

• "d0955f21bf24" is a container Id

docker rm d0955f21bf24

Remove all containers

docker stop $(docker ps -a -q)
docker rm $(docker ps -a -q)

More Advence Topics

Build an image from a Dockerfile

docker build -t objectif/appname -f pathtoDockerfile

docker build -t [username]/docker-desktop git://github.com/rogaha/docker-desktop.git

Execute more advances

docker run -i -t --net="bridge" --name Demo -v /opt/docker/data mindesktop:v01.01

Dockerfile Sample

node Js app

• Create a new directory

Create node app

• Create package.json

{
  "name": "docker_web_app",
  "version": "1.0.0",
  "description": "Node.js on Docker",
  "author": "First Last <first.last@example.com>",
  "main": "server.js",
  "scripts": {
    "start": "node server.js"
  },
  "dependencies": {
    "express": "^4.16.1"
  }
}

• Create server.js

'use strict';

const express = require('express');

// Constants
const PORT = 8080;
const HOST = '0.0.0.0';

// App
const app = express();
app.get('/', (req, res) => {
  res.send('Hello world\n');
});

app.listen(PORT, HOST);
console.log(`Running on http://${HOST}:${PORT}`);

Create Dockerfile

• Create a file Dockerfile

FROM node:10

# Create app directory
WORKDIR /usr/src/app

# Install app dependencies
# A wildcard is used to ensure both package.json AND package-lock.json are copied
# where available (npm@5+)
COPY package*.json ./

RUN npm install
# If you are building your code for production
# RUN npm ci --only=production

# Bundle app source
COPY . .

EXPOSE 8080
CMD [ "node", "server.js" ]

• Create a file .dockerignore

node_modules
npm-debug.log

Build Image

• Don't forget the "." at the end...

docker build -t <username>/<applicationname> .

List Images

docker images

Run Image

docker run <username>/<applicationname>

Ghost (Blog Server)

FROM komljen/nodejs
MAINTAINER Alen Komljen <alen.komljen@live.com>
ENV GHOST_VERSION 0.5.7
ENV APP_ROOT /data/app
RUN \
curl -sLO http://ghost.org/archives/ghost-${GHOST_VERSION}.zip && \
mkdir -p ${APP_ROOT} && \
unzip -uo ghost-${GHOST_VERSION}.zip -d ${APP_ROOT} && \
rm ghost-${GHOST_VERSION}.zip
RUN \
cd ${APP_ROOT} && \
npm install --production
ADD start.sh start.sh
VOLUME ["$APP_ROOT"]
RUN rm /usr/sbin/policy-rc.d
CMD ["/start.sh"]
EXPOSE 2368

Gui management solution for Docker

Portainer

Web site https://portainer.io

Dashboard access http://localhost:9000/#/dashboard

Deployment

docker run -d --name myPortainer -p 9000:9000 --restart always -v /var/run/docker.sock:/var/run/docker.sock -v /opt/portainer:/data portainer/portainer-ce

Upgrade

• Stop Portainer
• Remove Portainer
• Pull new /upgraded image
• Recreate Portainer

docker stop myPortainer
docker rm myPortainer
docker pull portainer/portainer-ce
docker run -d --name myPortainer -p 9000:9000 --restart always -v /var/run/docker.sock:/var/run/docker.sock -v /opt/portainer:/data portainer/portainer-ce

Docker Server Remote Management

1. These commands get run inside of your VM.

# Create the directory to store the configuration file.
sudo mkdir -p /etc/systemd/system/docker.service.d

1. Create a new file to store the daemon options.

sudo nano /etc/systemd/system/docker.service.d/options.conf

1. Now make it look like this and save the file when you're done:

[Service]
ExecStart=
ExecStart=/usr/bin/dockerd -H unix:// -H tcp://0.0.0.0:2375

1. Reload the systemd daemon.

sudo systemctl daemon-reload

1. Restart Docker.

sudo systemctl restart docker