Docker und IBM Digital Experience in Docker Container

Transcription

1 Docker und IBM Digital Experience in Docker Container Juni 2017 IBM Labor Böblingen 1

2 What is docker Introduction VMs vs. containers Terminology v Docker components 2 6/22/2017

3 What is docker? An implementation of an application container Containers isolate the differences between applications inside the container everything outside the container can be standardized Lightweight virtualization solution Almost no performance overhead Mainly based on namespaces & cgroups Allows you to package an application with all of its dependencies into a standardized unit for software development. Can be moved between environments and run without changes 3

4 VMs vs Containers App A App A App B Containers are isolated, but share OS and, where appropriate, bins/libraries Bins/ Libs Bins/ Libs Bins/ Libs VM Guest OS Guest OS faster, less overhead Guest OS Guest OS Guest OS Container App A App B App B App B App B App B Hypervisor (Type 2) Host OS Server Bins/Libs Bins/Libs Host OS Server 4

5 Terminology Image A read-only snapshot of a container stored in Docker Hub to be used as a template for building containers Series of read-only storage layers Container The standard unit in which the application service resides Based on an image At start time a r/w layer is creation on top of the image s read-only layers 5

6 Docker components Docker Hub/Registry/Store Stores, distributes and shares container images Available in SaaS or Enterprise to deploy anywhere you choose Docker Engine A program that creates, ships and runs application containers Runs on any physical and virtual machine or server locally, in private or public cloud Client communicates with Engine to execute commands 6

7 Docker components Docker Compose Tool to define and run multiple containerized applications (like DX+DB2) Allows to define networks, storage etc. Docker swarm Manages a cluster of containers Docker Machine Tool for provisioning and managing your Dockerized hosts (hosts with Docker Engine on them) Docker on Cloud 7

8 Docker orchestration Marathon (container management) / Mesos (Hardware abstraction) Kubernetes Cloud native options Bluemix... 8

9 Create your server / VM Install docker engine How to get started Install docker compose Install docker registry v Build docker images Created compose files 9 6/22/2017

10 Install docker engine Community Edition (CE) and Enterprise Edition (EE) Available on Linux, Cloud, Windows, and OS X For RedHat and CentOS yum installation Windows has two options Docker for Windows (Win10 + Hyper-V) Docker Toolbox (runs Virtualbox underneath) Is the runtime environment for the containers Default filesystem size for containers is 10G for DX containers use 40G (--storage-opt dm.basesize=40g) with LVM storage driver 10

11 Install docker compose Requires docker engine docker-compose based start is recommended Pull it using curl and make it executable curl -L -s`-`uname -m` > /usr/local/bin/docker-compose chmod +x /usr/local/bin/docker-compose Test the installation docker-compose version 11

12 Install docker registry A central place to store and distribute docker images Runs in a docker container Docker Hub is a free registry to use Be aware of licencing issues Secured by default It s recommeded to use the compose version User / Password for access is via authorization file (similar to HTTP Server) Run docker login $(hostname):5000 to verify the registry 12

13 Build docker images Manual build v Automated build using a dockerfile 13 Footer 6/22/2017

14 Build docker images - Manual build Start the base image Run the installation commands inside the container Exit the container Commit the changes Push the container to the registry 14

15 Build docker images - Automated build using a docker-file Create a docker file Every step creates a new layer / image impacts image size Run docker build command Images can get tagged with a name Tag the image (unless done during build) Tags are in <name>:<tag> format <name> format: [<registry-host>:<registry-port>/]<image-name> Push the image to the registry 15

16 Docker network System defined networks User defined networks User defined networks allow a better isolation of the containers All containers on a network can communicate with each other Containers can be connected to multiple network List the existing networks by running docker network ls 16

17 Docker volumes Are directories on the host file-system (i.e. Outside of the container) Can be seens as mounting a host-filesystem over a containers directory Content of the containers directory which is mapped to the volume is copied to the host file-system at initialization time Needed to Persist changes Share data with other containers 17

18 Creating the compose file Docker compose uses a.yml file to define the runtime environment Environment variables can be defined in a.env file Using the compose file we can combine multiple containers to a working application WebSphere Portal container + DB2 container DX application No synchronization between containers by compose Your start script must cover dependencies Starting the.yml via docker-compose docker-compose p 1 -f./docker-compose_wasfp10_cf12_derby.yml up -t60 18

19 Support DX and Docker Install and Config Roadmap v 19 Footer 6/22/2017

20 Support Virtualization Policy for IBM Software Virtualization Support Policy for WebSphere Application Server Virtualization Support Policy for DX This includes VMWare, Docker, KVM, PowerVM Hypervisors, Rarely ever have we encountered software issues with virtualization other than performance sizing, communication or other environment related issues 20

21 DX and Docker We have added testing with Docker containers and published an article on a possible setup here: Setup is for development with local Derby as DB Internally we have done additional setups with DB2 in a separate container as well as other scenarios like farming or cluster 21

22 Install and Config Options to install: Install Portal into a Docker container and save as image Link or copy an existing install into a Docker container and save as an image Options to configure: Database, http server inside containers or not possible orchestration with docker swarm and docker compose Clustered or Farmed or standalone 22

23 DX Container roadmap Based on Market demand we will keep on testing new Container software solutions and publish how to articles Planning to publish to a public Container registry as well Currently can easily build images locally based on need (e.g. with local DB2 or remote or ) 23

24 Image hierarchy Image size Lessons learned Start / stop Build performance v Use LVM instead of loop device Automation of deployments Topologies 24 Footer 6/22/2017

25 Lessons learned - Image hierarchy Images are build on a layered basis Docker Hub CentOS yum Customized CentOS db2 DB2 Custom modifications DB2 IIM imcl imcl WAS imcl WP v WAS WP v CF09 CF10 WAS WP v WAS WP v Cust. Cust. WAS WP v c WAS WP v c CF09 CF10 WAS WP v WAS WP v Cust. Cust. WAS WP v c WAS WP v c 25

26 Lessons learned - Image size Images are a series of read-only storage layers Each layer adds to the image size Each step in the build file creates a new layer FROM registry.host.de:5000/centos_iim:1.8.5 MAINTAINER Hermann Huebler Hermann_huebler@de.ibm.com" LABEL name="registry.host.de:5000/test" version="1.0" FROM registry.host.de:5000/centos_iim:1.8.5 RUN echo " httphost" >> /etc/hosts && \ MAINTAINER Hermann Huebler Hermann_huebler@de.ibm.com" mkdir -p /iimrepo/pkgs/wp85 && \ LABEL name="registry.host.de:5000/test2" version="2.0" cd /iimrepo/pkgs/wp85 && \ RUN echo " httphost" >> /etc/hosts && \ echo "Downloading WSP_Enable_8.5_Setup.zip..." && \ mkdir -p /iimrepo/pkgs/wp85 && \ curl -o /iimrepo/pkgs/wp85/wsp_enable_8.5_setup.zip cd /iimrepo/pkgs/wp85 && \ && \ echo "Downloading WSP_Enable_8.5_Setup.zip..." && \ echo "Unzipping WSP_Enable_8.5_Setup.zip" && \ curl -o /iimrepo/pkgs/wp85/wsp_enable_8.5_setup.zip unzip -o./wsp_enable_8.5_setup.zip > /tmp/unzip.log 2>&1 RUN rm -rf /iimrepo/ RUN echo "Done..." ENTRYPOINT ["/bin/startcontainer.sh"] GB && \ echo "Unzipping WSP_Enable_8.5_Setup.zip" && \ unzip -o./wsp_enable_8.5_setup.zip > /tmp/unzip.log 2>&1 && \ rm -rf /iimrepo/ && \ echo "Done..." ENTRYPOINT ["/bin/startcontainer.sh"] registry.host.de:5000/centos_iim: MB MB

27 Lessons learned - Container start / stop Start script of the container is specified in the ENTRYPOINT ["/bin/startcontainer.sh"] becomes PID 1 Can be overwritten in the compose file Stopping the container is by sending a kill signal The PID 1 in the container gets this signal forwarded [root@wp85-derby /]# ps -ef UID PID PPID C STIME TTY TIME CMD root :03? 00:00:00 bash /bin/startcontainer.sh The script running as PID 1 must handle the kill signal for a controlled container stop DB2 & DX start scripts start a daemon Script must stay active 27

28 Lessons learned - Container start / stop : trap "echo '**CAUGHT TRAP**' ; \ /opt/ibm/websphere/wp_profile/bin/stopserver.sh WebSphere_Portal; \ exit 0" HUP INT QUIT TERM : ## ## start service in background here /opt/ibm/websphere/wp_profile/bin/wp85up.sh & WPPID=$! echo "Background PID=${WPPID}" wait ${WPPID} rc=$? 28

29 Lessons learned Build performance Installation binaries must be copied to the container for build Docker provides a COPY instruction DX binaries are too big and cause problems Very slow for large files goes thru the docker daemon Providing the binaries via an HTTP server and pulling via curl Significantly faster solution More stable 29

30 Lessons learned Use LVM instead of loop device By default docker engine uses a loop device to mount host file-system Easy setup Size of DX images causes troubles Hangs Docker provides the ability to mount LVM logical volumes Recommended way for build system See for instructions Use fast disks (SSD) to improve build performance 30

31 Lessons learned Automation of deployments To allow automation of image builds application deployment automation is a must We used IBM Autodeploy to deploy the portal.ear Build file 31

32 Lessons learned Topologies Works nicely for single server installations With derby and or DB2 database (on the same server) Farming with shared or copied profile directory seems a good fit Consider the managed pages limitations Clustering difficult due to networking requirements 32

33 For Additional Information Install Docker Engine Docker and the Device Mapper storage driver Docker Compose Docker Registry IBM Digital Experience on Docker Containers 33

34 For Additional Information IBM AutoDeploy Virtualization Policy for IBM Software Virtualization Support Policy for WebSphere Application Server Virtualization Support Policy for DX 34

35 Begin your 30-day free trial of Watson Content Hub today 35 Amplify Watson 2017 Customer Engagement

36 Vielen Dank! Was Sie interessieren könnte: Migration auf V9 "Trends and Best Practices" WCH JumpStart #1 & #2 Thomas Hurek, Watson Content Hub Frontend Squad Lead 36 Footer Hermann Huebler, IBM Digital Experience Lab Services 6/22/2017