docker

9.0
César Diniz Maciel
Executive IT Specialist
IBM Corporate Strategy
cmaciel@us.ibm.com
Docker containers on IBM Power Systems -
Introduction, Administration and Use Cases

2
IBM Systems Technical Events | ibm.com/training/events
© Copyright IBM Corporation 2016. Technical University/Symposia
materials may not be reproduced in whole or in part without the
prior written permission of IBM.
Session objectives
After this session, you will be able to:
• Understand about containers and how they are useful for
deploying applications;
• Learn how to install Docker on Power Systems and how to
deploy containers;
• Learn basic Docker management commands, how to create
images and how to move containers across systems;

3
Agenda
●
What are containers?
●
Why containers?
●
Differences between containers and virtual machines
●
Docker on Power Systems
– Installing Docker
– Creating base image
– Deploying containers
●
Comparing Docker to AIX Workload Partitions
●
Managing containers

4
4

5
What are Containers?
●
Two new features enabled containers
●
Cgroups and Name spaces
●
Different name space for process
●
Own process space
●
Can run stuff as root (Chroot)
●
Concept from Plan9 (1992)
●
Done with setns and unshare system call
●
Share the same kernel
● No device emulation
● A name space is completely separated
●
Full network stack on the new name space
●
Own routes
●
Own Firewall rules
●
Name resolution mechanism
● Mount, PIDs, IPCs,
Server
Host OS
Linux Container + Docker Engine
Middleware YMiddleware X
App
A
App
A
App
A1
App
A1
App
B
App
B
App
B1
Container

6
What is Docker?
●
Operating system-based virtualization
– Aimed at quick and efficient deployment of applications
in a virtualized container environment.
●
From http://docker.com
– Docker is an open platform for developers and
sysadmins to build, ship, and run distributed
applications. It runs as an isolated process in
userspace on the host operating
system, sharing the kernel with
other containers. Thus, it enjoys
the resource isolation and
allocation benefits of VMs but is
much more portable and efficient.

7
Why Docker
●
Fast to deploy
●
Lightweigth
●
Almost no performance impact for applications
●
Very efficient use of resources
●
Ability to pack applications, configuration files, pre-
requisites, etc in a docker image for easy distribution
and deployment.
●
Ability to run different Linux versions and flavors in the
same host system.

8
Differences between Docker and VMs
●
Docker is an OS-based virtualization
– Same concept as Virtualbox, Vmware Workstation, AIX
WPAR, Solaris Containers, BSD Jails...
●
Kernel is shared among all containers
●
Every container runs the same kernel version
●
Kernel parameters are the same for all containers, as well
as network and I/O
●
No strong isolation between containers – processes are
isolated from each other, but all containers run under the
same OS instance

9
●
Portability
●
If it works locally, it will work on the server, with
exactly the same behavior, regardless of
versions, distro, dependencies
●
Quick boot
●
Faster provisioning
●
Can fit far more containers than VMs into a host
●
Simplified security
●
Only need to fix things on the hosts
●
Lower Costs
●
Fewer operating systems to manage
●
Easy OS patching
●
Greater application mobility
●
Starting/Stoping a container is a about process
management
Benefits of containers
Manual VM Docker
Provision
TimeDays
Minutes
Seconds / ms

10
●
Docker Engine available as part of base distribution packages from Ubuntu 15.04 and
Fedora 23 onwards
●
Docker can be built from source on various Linux distros on POWER
●
Ubuntu, RHEL 7, SLES 12 etc
●
Refer for more info - https://www.ibm.com/developerworks/library/l-docker /
●
Docker image registry can be compiled on different Linux on POWER distributions
●
Multi-arch registry is work in progress
https://gist.github.com/estesp/a3546f3cf24d2fc9cecc
●
IBM is working with the community to make additional images available for POWER in
Docker Hub
https://hub.docker.com/u/ppc64le/
Ubuntu, Debian, gcc are already available
IBM POWER containers support

11
Installing Docker on Power Systems
●
Docker officially supported on
Ubuntu Vivid Vervet (15.04) and above
– Install the docker package
●
apt-get install docker.io
●
Part of the Ubuntu distribution and maintained by Canonical.

12
Using Docker
●
Docker users can install images from Docker Hub, a public
repositores for Docker images
– However, it is x86-oriented. That means that by default, docker pulls
a x86 image from the server.
– Multiarch support for Docker Hub is being worked
- Meanwhile, non-x86 images have distinct names to identify them,
such as 'fedora22_ppc64le'
●
Docker on POWER users can create their own images, and
then can share them by running a private Docker Hub
●
Most enterprises will probably have their own images in a
private repository for security.

13
Creating a Docker image
●
Simple ways to create images are:
– Debian Bootstrap (debootstrap)
– Ubuntu Core (14.04 only)
●
Cloning a system into an image is also possible
– Allows for migration from virtual machines to containers
– Environment can be customized (i.e. applications installed, etc)
before generating the image for container deployment.

17
●
Similar concept of OS-based virtualization
●
AIX allows for multiple OS versions to coexist
– Host partition must be on AIX 7
– Hosted WPARs can be AIX 5.2, 5.3 or 7
●
Docker allows for multiple OS versions
– Host partition does not have to be at latest level
– Can host OS versions that are higher or lower
– All run same kernel version, since it is shared by all containers, so
while the OS version may change, the kernel does not

18
●
AIX WPARs are always persistent. Docker containers are not
– You have to explicitly save the container in order to save changes made
while running
– Application data normally resides on data volumes, that are filesystems
mounted by Docker, and these are persistent – therefore application data
is always saved to disk and does not require the commit operation on
the container.
●
Each AIX WPAR is a separate image. Docker can instantiate
multiple containers from the same image
– Easier to deploy and maintain a pool of similar environments
– Docker automatically assigns a new IP for each instance

LXC and Docker usage
Similar to AIX System WPAR Similar to AIX Application WPAR

20
Using Docker Containers
●
docker images
●
docker ps -a
●
docker run <container>
●
docker run -i -t <container> /bin/bash
●
docker rm <container>
●
docker rmi <image>
●
docker commit <container_id> <some_name>

21
Docker demo on Power Systems
●
As root, do:
●
docker -v
●
docker images
●
docker ps -a
●
cat /etc/lsb-release
●
docker run vividcore cat /etc/lsb-release
●
docker run ubuntu cat /etc/lsb-release

22

23

24

25
Docker use cases

26
Example of running Apache on Docker
●
Based on customization script called Dockerfile
●
Dockerfile specifies image to base installation, adds extra
packages, copy files and configures applications
●
Container started with port forwarding

27
Dockerfile
FROM ubuntucore
MAINTAINER Breno Leitao
RUN apt-get update && apt-get install -y php5 libapache2-mod-php5 php5-mysql
php5-cli
&& apt-get clean && rm -rf /var/lib/apt/lists/*
ENV APACHE_RUN_USER www-data
ENV APACHE_RUN_GROUP www-data
ENV APACHE_LOG_DIR /var/log/apache2
ENV APACHE_PID_FILE /var/run/apache2/apache2.pid
ENV APACHE_RUN_DIR /var/run/apache2
ENV APACHE_LOCK_DIR /var/lock/apache2
EXPOSE 80
CMD ["/usr/sbin/apache2", "-D", "FOREGROUND"]
Instruction set: https://docs.docker.com/reference/builder/

28
Building the container
~/apache# docker build –tag=“apache2“ .
●
Sending build context to Docker daemon 2.048 kB
●
Sending build context to Docker daemon
●
Step 0 : FROM ubuntucore
●
---> 7b89a2b48b6a
●
Step 1 : MAINTAINER Breno Leitao
●
---> Running in 956125bbc3e0
●
---> 9325c0f1d538
●
Removing intermediate container 956125bbc3e0
●
Step 2 : RUN apt-get update && apt-get install -y php5
libapache2-mod-php5 php5-mysql php5-cli
●
---> Running in d9d33eaef00c
●
Ign http://ports.ubuntu.com trusty InRelease
●
●

29
Example of running Apache on Docker
●
docker run -p 8080:80 -d apache2
– Starts the container in detached mode, and redirects container
port 8080 to host partition port 80
●
Since it is running detached, control the container using
docker commands (e.g. docker start, docker stop).

30
Moving a container to other system
●
docker save apache2 > apache.tar
– copy apache.tar to other system
●
docker load < apache.tar
●
docker run p 8080:80 d apache2

31
Managing containers
●
There are many tools for clustering, orchestration, resource management for
Docker
– Docker tools:
●
Swarm: Native clustering for Docker. It turns a pool of Docker hosts into
a single, virtual Docker host.
●
Compose: Tool for defining and running multi-container Docker
applications.
●
Machine:Tool that lets you install Docker Engine on virtual hosts, and
manage the hosts.
– Google Kubernetes: Open-source system for automating deployment,
operations, and scaling of containerized applications.
– Apache Mesos: Open-source cluster manager that provides efficient resource
isolation and sharing across distributed applications, or frameworks
All these tools run on POWER

32
Managing containers
Shipyard is an open source GUI
for managing and deploying
Docker containers

33
Managing containers

34
Docker at insane scale on IBM Power Systems
https://developer.ibm.com/bluemix/2015/11/13/docker-insane-scale-on-ibm-power-systems/

35
Conclusion
●
Containers offer a flexible way of deploying applications
with minimum effort.
●
System resources can be used efficiently, and
migration/deployment of new environments is quick and
easy.
●
Docker integration with cloud management tools such
as Openstack provides rapid instance deployment, and
multi-platform container management.
●
Docker for Power Systems allow all these benefits to
be used on a high performance and high reliability
platform.

36
References
• Seetharami Seelam, Ogata Kazunuri, et. al. : Docker on POWER
Platforms:
https://www.ibm.com/developerworks/library/d-docker-on-power-linux-platf
orm/
• Breno Leitao: Ubuntu Core on Docker for POWER
https://www.ibm.com/developerworks/community/blogs/fe313521-2e95-46
f2-817d-44a4f27eba32/entry/ubuntu_core_on_docker_for_power?lang=en
• Jean-Tiare LE BIGOT: Getting Docker to run on Power8
https://blog.jtlebi.fr/2014/10/28/getting-docker-to-run-on-power8/
• Pradipta Banerjee: How to create a Dockerized Application for Ubuntu on
Power (ppc64) Servers.
http://cloudgeekz.com/114/how-to-create-a-dockerized-application-for-ubu
ntu-on-power-ppc64-servers.html
• Pradipta Banerjee: Docker on Ubuntu Vivid Vervet for Power LE.
https://www.ibm.com/developerworks/community/blogs/fe313521-2e95-46
f2-817d-44a4f27eba32/entry/docker_on_ubuntu_vivid_vervet_for_power_
le?lang=en
36

docker

Recommandé

Recommandé

Contenu connexe

Tendances

Tendances (20)

En vedette

En vedette (20)

Similaire à docker

Similaire à docker (20)

docker