lecture2...•containers in practice: docker •summary 4.9.2019 ssss 2 general courserelatedmatters...
TRANSCRIPT
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Lecture 2virtualization
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Content
• General course related matters• Recap of DevOps• Virtualization – what and why?• Virtualizations techniques• Full/hypervisor virtualization• Containers• Containers in practice: Docker• Summary
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General course related matters
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Numbers
• Sign-ups in ROCK: 96• Sign-ups in plus: 71• With UTA ID: 13 !
• Responses to initial questionary: 53• Final number <50?
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DevOps
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Virtualization – what and why?
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Use case 1: run ”foreign” software
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Machine instructions
Operating system
Run-time / libraries
Application
Machine instructions
Operating system
Run-time / libraries
Application VM tech
Machine instructions
Operating system
Run-time / libraries
Application
Machine instructions
Operating system
Run-time / libraries
Application
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Use case 2: isolate
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Machine instructions
Operating system
Run-time / libraries
Application
Machine instructions
Operating system
Run-time / libraries
Application
Machine instructions
Operating system
Run-time / libraries
Application
VM technology
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Use case 3: scale
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Machine instructions
Operating system
Run-time / libraries
Application
Machine instructions
Operating system
Run-time / libraries
Application
Machine instructions
Operating system
Run-time / libraries
Application
VM technology
Customer 1 Customer 2
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Levels of virtualization
• Hardware virtualization• Operating system virtualization• Desktop virtualization• Application virtualization• Network virtualization
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Network virtualization
• Network, its HW and protocols, is simulated with software so that it looks like a different network to applications• Different from OSI layer models
• Is VPN a virtual network?
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Application virtualization
• Applications are compiled to machine-independent ”machine ” code• Applications are run with a virtual machine• Benefits• Same code can be run on different CPUs• Increased safety. Why?
• Problems• Performance
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Example: java
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Virtual machine
Hardware
Bytecode
Compiler
class
Programminglanguage
X = Integer.parseInt("1234");
Libraries (APIt)
Program
IDE
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Java security
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Virtual machine
Hardware
Bytecode
Compiler
class
Programminglanguage
X = Integer.parseInt("1234");
Libraries (APIt)
Program
IDE
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$ javap -c testCompiled from "test.java"class test {int X;
test();Code:
0: aload_0 // this1: invokespecial #1 // Method java/lang/Object."<init>":()V4: return
void foo();Code:
0: aload_01: ldc #2 // String 12343: invokestatic #3 // Method java/lang/Integer.parseInt:(Ljava/lang/String;)I6: putfield #4 // Field X:I9: return
}4.9.2019 ssss 15
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Desktop virtualization
• When you run the ”linux-desktop” (linux-desktop.cc.tut.fi) on your windows machine
• Piirretään kuva luennolla (eri mahdollisia tapoja)
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Hardware virtualization
• Hypervisor• HW or SW based
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VM tech
Machine instructions
Operating system
Run-time / libraries
Application
Machine instructions
Operating system
Run-time / libraries
Application
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Mika Kaaretkoski,Master thesis, 2018
F. Rodrguez-Haro et al., “A summary of virtualization techniques,” Pro-cedia Technology, vol. 3, pp. 267 { 272, 2012, the 2012 IberoamericanConference on Electronics Engineering and Computer Science. [Online]. Accessed:4.8.2018 Available: http://www:sciencedirect:com/science/article/pii/S2212017312002587
Guest
Host
Virtual Machine Mngr(Hypervisor)
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Type-1, native or bare-metal hypervisors
• Examples of virtualization that uses hardware assisted are Kernel-based Virtual Machine (KVM), VirtualBox, Xen, Hyper-V, and VMware products• Hardware-assisted = • Pros & cons
+ efficient+ provides service to all the guests in equivalent way- requires cleaning of the existing system clean- I/O device drivers must be available for installation in the VMM
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Different approached(source of pictures: VMWARE)
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Type-2 or hosted hypervisors
• A guest operating system runs as a process on the host.
• VMware Workstation, VMware Player, VirtualBox, Parallels Desktop for Mac and QEMU
• Emulation or binary translation
• Pros & cons+ Virtualizing SW use device drivers and other lower-level services of host- Loss of efficiency because more layers of SW involved
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Containers
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Basic of containers• Lightweight virtualization Guests share OS kernel with host
• In Linux (LXC) basically Separate namespaces
• IPC – inter-process communication
• Network
• Mount – Filesystem
• PID – Processes
• User
• UTS – hostname and domains
• Cgroup –
• Nice tutorial (with commercial at the end)
https://www.youtube.com/watch?time_continue=2&v=n-JwAM6XF88
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The dominant way to manage container: DockerSo dominant that we go details of one technology
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From docker.com
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Use case example• Your application needs• Certain version of nodejs• Set of libraries (certain versions)• Mongo database
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• Your system has• Wrong version of nodejs• Mongo serving another application
• Solution• Create a docker image (container)• Install the image• Run the image
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https://www.katacoda.com/courses/container-runtimes(thanks to your fellow student)
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Let investigate a bit
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I could not resist
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Typical set-up
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Host
Repository
Image
Image
Image
Download
Containe
r
Containe
r
Containe
r
Containe
r
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Typical set-up
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Host
Cont
aine
r
Cont
aine
r
Cont
aine
r
Cont
aine
r
Volume Volume
Volumes are for- Persistent data- Data sharing
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Docker commands (subset of)
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docker build Build an image from a Dockerfile
docker container Manage containers
docker commit Create a new image from a container’s changes
docker exec Run a command in a running container
docker image Manage images
docker inspect Return low-level information on Docker objects
docker ps List containers
docker run Run a command in a new container
docker stop Stop one or more running containers
docker swarm Manage Swarm
docker volume Manage volumes
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Dockerfile
#This is a sample ImageFROM ubuntuMAINTAINER [email protected] apt-get updateRUN apt-get install –y nginxCMD [“echo”,”Image created”]
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AnotherFROM node:6.10.0-alpine
# Never run processes as root!USER root
# Copy application itself:COPY . /homeWORKDIR /home# Set port on which to run the node process:ENV PORT=8893# Expose port 8893:EXPOSE 8893
CMD node pinger.js
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If I want to pre-install?
#This is a sample ImageFROM ubuntuMAINTAINER [email protected] apt-get updateRUN apt-get install –y nginxCMD [“echo”,”Image created”]
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?
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Vagrant
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Vagrant intro
• A way to create and distribute development environments as virtual machine (full VMs – not containers)• If time lets look: https://www.vagrantup.com/intro/index.html
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Vagrant vs Docker(https://www.vagrantup.com/intro/vs/docker.html)
• Vagrant is a tool focused on providing a consistent development environment workflow across multiple operating systems. Docker is a container management that can consistently run software as long as a containerization system exists.
• Containers are generally more lightweight than virtual machines, so starting and stopping containers is extremely fast. Docker uses the native containerization functionality on macOS, Linux, and Windows.
• Currently, Docker lacks support for certain operating systems (such as BSD). If your target deployment is one of these operating systems, Docker will not provide the same production parity as a tool like Vagrant. Vagrant will allow you to run a Windows development environment on Mac or Linux, as well.
• For microservice heavy environments, Docker can be attractive because you can easily start a single Docker VM and start many containers above that very quickly. This is a good use case for Docker. Vagrant can do this as well with the Docker provider. A primary benefit for Vagrant is a consistent workflow but there are many cases where a pure-Docker workflow does make sense.
• Both Vagrant and Docker have a vast library of community-contributed "images" or "boxes" to choose from.
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Next plus exercise – will be published today
• Run though this tutorial: <https://docs.docker.com/get-started/>Requires that you have a Linux. VM strongly recommended• Then, after all steps, return output of• docker image ls• docker container ls
• And answer to additional questions.• Deadline is “by next weekend”.
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Material
• Mika Kaaretkoski, Master thesis, 2018
• F. Rodrguez-Haro et al., “A summary of virtualization techniques,” Pro-cediaTechnology, vol. 3, pp. 267 { 272, 2012, the 2012 Iberoamerican Conference on Electronics Engineering and Computer Science. [Online]. • VMWare Inc., Understanding Full Virtualization, Paravirtualization, and
Hardware Assist, 2008. <https://www.vmware.com/content/dam/digitalmarketing/vmware/en/pdf/techpaper/VMware_paravirtualization.pdf>• Nice tutorial about docker; <https://docs.docker.com/get-started/>
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Rought plan – subject to change
• 30.08: Intro to the course and DevOps
• 06.09: Recap (from earlier courses) on virtualization technologies;
• 13.09: Cloud and scalability
• 20.09: Continuous Deployment –what & why
• 27.09: Continuous Deployment –tools and techniques
• 04.10: Security issues; recap on internet networking (from earlier courses)
• 11.10: Guest lecture on AWS
• 23.10: Issues on cloud-SW: isolation, dependency management etc,
• 30.10: Cloud-native architectures: microservices
• 06.11: Cloud-native architectures: FaaS/serverless
• 13.11: About automation: testing and beyond
• 20.11: Hosting and deployment issues
• 27.11: Guest lecture on Kubernetes
• 04.12: Recap
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