Providing and Supporting Docker Images · Label Schema LABEL org.label-schema.schema-version="1.0"...
Transcript of Providing and Supporting Docker Images · Label Schema LABEL org.label-schema.schema-version="1.0"...
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Providing and Supporting
Docker ImagesPhilipp Krenn̴̴̴̴@xeraa
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Infrastructure | Developer !
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Who uses
Docker?
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Who uses
Docker in production?
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Who uses
stateful Docker images?
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Who uses
our images?
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Who uses our stack with
other images?
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Docker: the world's most heavily funded college project
Internal quote from Slack
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Content"Official"
Base imagesRelease policy
SecuritySupport
Orchestration
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Docker Hub
"official"
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What do you get?docker pull elasticsearch
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Custom registrydocker.elastic.co
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I’m surprised more people don’t just host their own container registries
since doing that is faster than every cloud offering and docker hub
https://twitter.com/jessfraz/status/978449365261082625
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Our MotivationDownload statisticsSpeed & reliability
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ProblemsSome broken tooling like
automated builds, Kitematic,...ChinaIPv6
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https://hub.docker.com/r/elastic/elasticsearch/
kibana/*beat/logstash/apm-server/
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Quick QuizOur image or not?
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docker pull logstash:alpine
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docker pull elastic/elasticsearch
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docker pull kibana
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docker pull docker.elastic.co/beats/filebeat:6.2.3
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Base Images
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Elasticsearch
Alpine
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Kibana̴Beats̴Logstash
Ubuntu
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Common base image in 5.4+
CentOS 7
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https://github.com/elastic/elasticsearch-docker/blob/master/templates/Dockerfile.j2
FROM centos:7LABEL maintainer "Elastic Docker Team <[email protected]>"
ENV ELASTIC_CONTAINER trueENV PATH /usr/share/elasticsearch/bin:$PATHENV JAVA_HOME /usr/lib/jvm/jre-1.8.0-openjdk
RUN yum update -y && \ yum install -y nc java-1.8.0-openjdk-headless unzip wget which && \ yum clean all
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Upside
Similar setupShared layers
JVM images largish anyway
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Downside
Size
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$ docker imagesREPOSITORY TAG IMAGE ID SIZEdocker.elastic.co/kibana/kibana 6.3.0 128b6bfb9645 729MBdocker.elastic.co/elasticsearch/elasticsearch 6.3.0 7e188ef97fe0 783MBdocker.elastic.co/beats/filebeat 6.3.0 f90fd7f32529 318MBdocker.elastic.co/kibana/kibana 6.2.4 327c6538ba4c 933MBdocker.elastic.co/elasticsearch/elasticsearch 6.2.4 7cb69da7148d 515MBdocker.elastic.co/beats/filebeat 6.2.4 26a00abcde82 319MBdocker.elastic.co/kibana/kibana 5.6.7 0f8347a118b3 697MBdocker.elastic.co/elasticsearch/elasticsearch 5.6.7 f9bc1b5416b9 574MBdocker.elastic.co/beats/filebeat 5.6.7 02648e71cced 334MBdocker.elastic.co/kibana/kibana 5.3.3 ffe778f7e489 679MBdocker.elastic.co/elasticsearch/elasticsearch 5.3.3 5857f98b5920 165MBdocker.elastic.co/beats/filebeat 5.3.3 c01be8a8f630 232MB
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5.3 5.6 6.2 6.3
ES 165MB 574MB 515MB 783MB
Kibana 679MB 697MB 933MB 729MB
Filebeat 232MB 334MB 319MB 318MB
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Does it matter?
stateful vs stateless
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What to
include?
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Single image for 5.x
Platinum trial
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Three flavors 6.0 to 6.2
Basic*
, OSS, Platinum trial
* Default
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Two flavors 6.3+
Basic / Platinum trial*
, OSS783MB vs 673MB
* Default
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Future
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Multiple
JDK versions?6.2: OpenJDK 8
6.3 BC: OpenJDK 10.0.1
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Multiple
base images?
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Windows?!
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Release Policy
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No :latest
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Zombiesideas that should have been killed by evidence, but keep shambling along
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5 and 5.6?
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What's in a tag?docker.elastic.co/elasticsearch/elasticsearch 5.3.3 5857f98b5920 4 months agodocker.elastic.co/beats/filebeat 5.3.3 c01be8a8f630 5 months agodocker.elastic.co/kibana/kibana 5.3.3 ffe778f7e489 5 months ago
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Currently
Overwrite tag
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Label SchemaLABEL org.label-schema.schema-version="1.0" \ org.label-schema.vendor="Elastic" \ org.label-schema.name="elasticsearch" \ org.label-schema.version="{{ elastic_version }}" \ org.label-schema.url="https://www.elastic.co/products/elasticsearch" \ org.label-schema.vcs-url="https://github.com/elastic/elasticsearch-docker" \{% if image_flavor == 'oss' -%} license="Apache-2.0"{% else -%} license="Elastic License"{% endif -%}
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Base image & JVM direct dependencies
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Future
Add image version?
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Security
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Run Elasticsearch as
root
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Cockroachesclaims that disappear for a while when proved wrong, but just keep on coming
back
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ModeProduction: Clusterable
Development: Local network
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"Docker" modediscovery.type=single-node
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Bootstrap checksare here to stay
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6.0+ no more
default credentials
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6.0+ X-Pack non-trial requires
certificates
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Support
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The container runs Elasticsearch as user elasticsearch using uid:gid
1000:1000.https://www.elastic.co/guide/en/elasticsearch/reference/current/
docker.html
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Don't mutatethe bind mounted local directory
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Zombiesideas that should have been killed by evidence, but keep shambling along
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Those who do not understand Unix are condemned to reinvent
it, poorly.— Henry Spencer
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Docker default value?LimitNOFILE & LimitNPROC
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infinityhttps://github.com/moby/moby/commit/
8db61095a3d0bcb0733580734ba5d54bc27a614d (July 2016)
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Test$ docker run --rm centos:7 /bin/bash -c \ 'ulimit -Hn && ulimit -Sn && ulimit -Hu && ulimit -Su'10485761048576unlimitedunlimited
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Combine two new systems to get
chaos & despair
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Docker is a
leaky abstraction
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Orchestration
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Who uses
Kubernetes?
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Who uses
Swarm?
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Who uses
Mesos?
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Who uses
Nomad?
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No orchestrationyet
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Testingimages for orchestration
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Kubernetes 1.8 allows dots in env varshttps://github.com/kubernetes/kubernetes/issues/2707
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Kubernetes has made huge improvements in the ability to run
stateful workloads including databases and message queues, but I
still prefer not to run them on Kubernetes.
https://twitter.com/kelseyhightower/status/963413508300812295
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Kubernetes makes it easier to deploy stateful services not manage them.
Stateful services must meet Kubernetes half way and manage their own cluster membership, failover, and replication. CockroachDB and Consul are two great examples, but far from
perfect.https://twitter.com/kelseyhightower/status/963415653930553345
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Conclusion
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"Docker is disrupting the industry"
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"Can I run Elasticsearch on Docker?"
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"Should I run Elasticsearch on Docker?"
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Even when stateful services do the right things managing state is still hard. Mixing stateful and stateless applications on the same cluster
elevates the complexity of the entire cluster. Cluster security and upgrades
become much harder.https://twitter.com/kelseyhightower/status/963417215608369153
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https://www.meetup.com/Elasticsearch-Berlin/
Thursday June 14, 19:00Springer Nature
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Questions & DiscussionPhilipp Krenn̴̴̴@xeraa