In this tutorial, How to use Docker volume command to details for Data volumes. There are three main use cases for Docker data volumes:

• Keep data around when a container is removed
• To share data between the host filesystem and the Docker container
• To share data with other Docker containers

Docker volume command

Docker volume create

The syntax docker volume commands as below:

$ docker volume create [--option] NAME_VOLUME

Related docker volume command:

• docker volume create: Create a volume docker volume inspect: Display detailed information on one or more volumes
• docker volume ls: List volumes docker volume prune: Remove all unused volumes docker
• volume rm: Remove one or more volumes

How to create a new volume and configure the container

$ docker volume create DATA
$ docker run -d -v DATA:/world centos ls /world

How to inspect container ID with docker inspect command

$ sudo docker inspect a04ae7b6cc17

For example, the output as below

"Mounts": [
 {
 "Name": "0ed908df33e1790711933ad6b463fd2a88199802c5cf2b1beb5001b81bc27750",
 "Source": "/var/lib/docker/volumes/0ed908df33e1790711933ad6b463fd2a88199802c5cf2b1beb5001b81bc27750/_data",
 "Destination": "/var/www/html",
 "Driver": "local",
 "Mode": "",
 "RW": true,
 "Propagation": ""
 },

To use docker inspect display Source and Destination for container ID

$ sudo docker inspect -f '{{ .Mounts}}' a04ae7b6cc17 | awk '{ print "Source:"$2 "\t " "Destination:"$3}'

The output below:

Source:/var/lib/docker/volumes/0ed908df33e1790711933ad6b463fd2a88199802c5cf2b1beb5001b81bc27750/_data Destination:/var/www/html

How to use docker volume ls to list all volume for container

$ sudo docker volume ls

The output as below

[sudo] password for huupv:
 DRIVER VOLUME NAME
 local 0ed908df33e1790711933ad6b463fd2a88199802c5cf2b1beb5001b81bc27750
 local 1d4c9030aea8554335b281d554a27422773f067f77ead5663e9b52f85d64ff6f
 local 387a0f11796f6d6d254abbbdf523410a42ed004dc5879c59ae45f5c922038441
 local 85621d725c9cee6444ab83162123000dd18bdd9a0a974a3cbe05b60d0175bc33
 local bbaaa1ea0d348d1e66ae6f606396502d895db8f6f2cd6f1cc9ca34605da3cf3c
 local devopsroles
 local e1f8e62ec711164a363bbc9bc53a0868e093dc7e4983fb327fe5f77b4e48d965
 local wordpress_db-data
 local wordpress_nginx-data
 local wordpress_php-data
 local wordpress_wp-data

How to use docker inspect exploit for container ID a04ae7b6cc17

$ sudo docker inspect -f '{{ (index .Mounts 0).Source }}' a04ae7b6cc17

The output Mounts source container ID a04ae7b6cc17

/var/lib/docker/volumes/0ed908df33e1790711933ad6b463fd2a88199802c5cf2b1beb5001b81bc27750/_data

Other dockers inspect command Mounts source container ID a04ae7b6cc17

$ sudo docker inspect --format '{{ range .Mounts }}{{ if eq .Destination "/var/www/html" }}{{ .Source }}{{ end }}{{ end }}' a04ae7b6cc17

How to create a Docker Volume Using a Dockerfile

$ vim Dockerfile

The content as below

# Create a volume
 VOLUME /dockerfilevolume

Next, build an image named dockerfile-volumetest from this Dockerfile with the command:

$ sudo docker build -t dockerfile-volumetest .

Then launch a container named “my-dockerfile-test” from this image with the command:

$ sudo docker run --name my-dockerfile-test -it dockerfile-volumetest /bin/bash

Detach from the container with Ctrl-p + Ctrl-q and return to the host machine’s command prompt.

Sharing Volumes Between Containers

Sharing a Volume on the Host

$ sudo mkdir /webdata
$ sudo docker run -it --name webapp -v /webdata:/var/www/html nginx /bin/bash

Using a Container as a Shared Data Volume

$ sudo docker run -it -v /shared-data --name data-storage centos /bin/bash
$ echo "Hello from the data-storage container." >> /shared-data/data-storage-hello.txt
$ sudo docker run -it --name app --volumes-from data-storage python /bin/bash

Mounting a Volume as Read-Only

$ docker run -v /directory:/path:ro
$ sudo docker volume create --name limited-access
$ sudo docker run -it --name allowed-to-write -v limited-access:/data centos /bin/bash

Conclusion

Thought the article, help you to details for data volume. Docker volume command helps useful to determine for containers. The update about docker volume command later. Thank you for reading the DevopsRoles page!

Docker Nginx static website. How to use Docker to test a static website. I’m used Dockerfile to build and test as a local web development environment.

To create a directory for our Nginx Dockerfile

$ mkdir nginx
$ cd nginx
$ mkdir devopsroles
$ touch devopsroles/index.html
$ touch Dockerfile

The content our Dockerfile

FROM ubuntu:14.04
MAINTAINER PHAN VAN HUU <pvhuu90@gmail.com>, My blogs:devopsroles.com
RUN apt-get update
RUN apt-get -y -q install nginx
RUN mkdir -p /var/www/html/devopsroles
#ADD devopsroles/index.html /var/www/html/devopsroles/
ADD devopsroles.conf /etc/nginx/conf.d/
ADD nginx.conf /etc/nginx/nginx.conf
EXPOSE 80

The content of our devopsroles.conf file as below

server {
listen 0.0.0.0:80;
server_name _;
root /var/www/html/devopsroles;
index index.html index.htm;
access_log /var/log/nginx/default_access.log;
error_log /var/log/nginx/default_error.log;
}

File configure nginx.conf as below

user www-data;
worker_processes 4;
pid /run/nginx.pid;
daemon off;
events {
}
http {
sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 65;
types_hash_max_size 2048;
include /etc/nginx/mime.types;
default_type application/octet-stream;
access_log /var/log/nginx/access.log;
error_log /var/log/nginx/error.log;
gzip on;
gzip_disable "msie6";
include /etc/nginx/conf.d/*.conf;
}

To create our index.html file as below:

$ cat devopsroles/index.html

The content as below:

<head>
<title>Test website</title>
</head>
<body>
<h1>Hello! My name HuuPV</h1>
</body>

Building our new Nginx image

$ sudo docker build -t devopsroles/nginx:v2 .
$ sudo docker run -d -p 8080:80 --name devopsroles -v /home/huupv/project/nginx/devopsroles:/var/www/html/devopsroles:ro devopsroles/nginx:v2 nginx

The result, Docker Nginx static website

To use docker images command as below:

$ sudo docker images

The output devopsroles container as below:

[sudo] password for huupv: 
REPOSITORY TAG IMAGE ID CREATED SIZE
devopsroles/nginx v2 8598ffebf6ae 10 minutes ago 305.1 MB

To use docker ps command as below:

$ sudo docker ps

The output below

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
ebab6b61682b devopsroles/nginx:v2 "nginx" 8 minutes ago Up 8 minutes 0.0.0.0:8080->80/tcp devopsroles

To use curl command test docker Nginx static website

$ curl http://localhost:8080

Conclusion

To deploy simple static website use docker. Docker Nginx static website uses Dockerfile to build as the container. Thank you for reading the DevopsRoles page!

While you build docker images, it is many untagged images as <none> images. In my tutorial, Docker remove none images or How to stop all CONTAINER ID.

Docker remove none images

To display <none> images:

[huupv@docker nginx-reverse]$ sudo docker images | egrep "^<none>"

The output below:

<none> <none> 55c87cfec131 9 minutes ago 196.6 MB
<none> <none> 8bdd100ab20d 11 minutes ago 196.6 MB
<none> <none> bddbdbcfac80 55 minutes ago 396.5 MB
<none> <none> e8aa668e28d0 19 hours ago 396.5 MB

Docker remove all <none> images

[huupv@docker nginx-reverse]$ sudo docker images | egrep "^<none>" | awk '{print $3}' | xargs sudo docker rmi -f

How to stop all CONTAINER ID

To display all container ID

[huupv@docker ~]$ sudo docker ps | egrep -v "CONTAINER ID" | awk '{print $1}'

The output below:

24e65acc6d21
24da33d6e0d5
09488028a7a9
b3b5926dcb82

To stop all container ID

[huupv@docker ~]$ sudo docker ps | egrep -v "CONTAINER ID" | awk '{print $1}' | xargs sudo docker stop

Thank you for reading the DevopsRoles page!

In this tutorial, How to install docker compose on centos. First of all, installed docker on your system. In this preview, Install docker and learn containers on Centos.

What is Docker compose?

Docker compose is tool orchestration manage containers, defining and running multi-container Docker applications, it’s working multiple containers docker application and use the compose file in the YAML format.

How to install docker compose on Centos

Install docker compose on centos 6

The docker compose the latest version, To check the https://github.com/docker/compose/releases

# curl -L https://github.com/docker/compose/releases/download/1.16.1/docker-compose-`uname -s`-`uname -m` -o /usr/local/bin/docker-compose
# chmod +x /usr/local/bin/docker-compose

To check docker compose version:

# docker-compose -v

The screen output terminal:

docker-compose version 1.16.1, build 6d1ac21

Install docker compose on centos 7

To install docker compose

# yum install -y python-pip
# pip install docker-compose

To upgrade all the python packages on Centos 7

# yum upgrade python*

The screen output terminal:

docker-compose version 1.16.1, build 6d1ac21

Testing Docker Compose

To create a new directory and move into it

 $ mkdir hello-world
 $ cd hello-world

To create a new YAML file

$ vim docker-compose.yml

The content file docker-compose.yml as below

 devopsroles-test:
 image: hello-world

To save and exit

To rune the container

$ sudo docker-compose up

The screen output terminal:

 $ docker-compose up
 Pulling devopsroles-test (hello-world:latest)...
 latest: Pulling from hello-world

3619f633e2e6: Pulling fs layer
 3619f633e2e6: Downloading [==================================================>] 3619f633e2e6: Extracting [==================================================>] 93619f633e2e6: Extracting [==================================================>] 93619f633e2e6: Pull complete
 bef02f2f6467: Extracting [==================================================>] bef02f2f6467: Extracting [==================================================>] bef02f2f6467: Pull complete
 Digest: sha256:a69dda95faa021234ab2d92118e9539d0175b46587803e32435ea2e534f2db06
 Status: Downloaded newer image for hello-world:latest
 Creating helloworld_devopsroles-test_1...
 Attaching to helloworld_devopsroles-test_1
 devopsroles-test_1 |
 devopsroles-test_1 | Hello from Docker!
 devopsroles-test_1 | This message shows that your installation appears to be working correctly.
 devopsroles-test_1 |
 devopsroles-test_1 | To generate this message, Docker took the following steps:
 devopsroles-test_1 | 1. The Docker client contacted the Docker daemon.
 devopsroles-test_1 | 2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
 devopsroles-test_1 | 3. The Docker daemon created a new container from that image which runs the
 devopsroles-test_1 | executable that produces the output you are currently reading.
 devopsroles-test_1 | 4. The Docker daemon streamed that output to the Docker client, which sent it
 devopsroles-test_1 | to your terminal.
 devopsroles-test_1 |
 devopsroles-test_1 | To try something more ambitious, you can run an Ubuntu container with:
 devopsroles-test_1 | $ docker run -it ubuntu bash
 devopsroles-test_1 |
 devopsroles-test_1 | Share images, automate workflows, and more with a free Docker ID:
 devopsroles-test_1 | https://cloud.docker.com/
 devopsroles-test_1 |
 devopsroles-test_1 | For more examples and ideas, visit:
 devopsroles-test_1 | https://docs.docker.com/engine/userguide/
 devopsroles-test_1 |

Conclusion

Through the article, you can use How to install docker compose as above. I hope will this your helpful. Thank you for reading the DevopsRoles page!

In this tutorial, List all useful commands for docker. How to restart one or more containers and stop one or more containers and so forth. The description useful Docker commands line reference as the link below

What is Docker?

• Docker is a platform for developers and sysadmins to build, ship and run application”. It’s allow run containers and A container running Application. It’s dependencies on the host operating system.
• Docker is OS level Virtualization.

All containers are started based on Docker image. To find existing images at https://hub.docker.com/

Docker commands line reference

To use command find an image

$ docker search <name>

To run a container based on a Docker Image. The default, to rune command in the foreground. To rune in the background with option -d. Docker to rune latest version available.

$ docker run <options> <image_name>

Find out running containers

$ docker ps

More details running a container

$ docker inspect <name-container>|<container-id>

Providing logs details running a container

$ docker logs <name-container>|<container-id>

To access a container with <host-port>:<containers-port>

$ docker run -d --name <name-container> -p <host-port>:<containers-port> <Image>

Persisting Data for containers

$ docker run -d --name <name-container> -v <host-dir>:<container-dir> <Image>

accessing to a bash shell inside of a container

$ docker run -it <name-container> bash

List all the images on the host

$ docker images

To use docker build command to build the image

$ docker build -t <name> .

Docker Ignoring Files during Build, to exclude sensitive files during build the image.

$ echo file_name.txt >> .dockerignore

To create Data Container

$ docker create -v /config --name dataContainers busybox

Copy files to data containers

$ docker cp config.conf dataContainers:/config/

Mount Volumes From data containers

$ docker run --volumes-from dataContainers ubuntu ls /config

To Export / Import for data Containers

 $ docker export dataContainer > dataContainer.tar
 $ docker import dataContainer.tar

Docker communicating between containers

$ docker run --link <container-name|id>:<alias> New_container

How to get quick stats on Docker containers

$ docker stats

Conclusion

Through the article, you can use the Docker commands line reference as above. I hope will this your helpful. Thank you for reading the DevopsRoles page!