Providing and Supporting Docker Images

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Offizielle Docker Images ein Erfahrungsbericht Philipp 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 Images Release Policy Security & Stability Customization Orchestration

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Docker Hub "official"

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What do you get? docker pull elasticsearch:X Same for Kibana and Logstash

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It's Complicated Docker Inc Deprecated Replicated

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Custom Registry docker.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 Motivation Download statistics Speed & reliability

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https://www.docker.elastic.co

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Problems Some broken tooling like automated builds, Kitematic,... China IPv6

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https://hub.docker.com/r/elastic/ elasticsearch/ kibana/ *beat/ logstash/ apm-server/

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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:7 AS prep_es_files ENV PATH /usr/share/elasticsearch/bin:$PATH RUN curl -s https://download.java.net/java/GA/jdk11/13/GPL/openjdk-11.0.1_linux-x64_bin.tar.gz | \ tar -C /opt -zxf - ENV JAVA_HOME /opt/jdk-11.0.1 RUN groupadd -g 1000 elasticsearch && \ adduser -u 1000 -g 1000 -d /usr/share/elasticsearch elasticsearch

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Upside Similar setup Shared layers JVM large anyway

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Downside Size

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$ docker images REPOSITORY TAG IMAGE ID SIZE docker.elastic.co/kibana/kibana 6.5.0 fcc1f039f61c 727MB docker.elastic.co/elasticsearch/elasticsearch 6.5.0 ff171d17e77c 774MB docker.elastic.co/beats/filebeat 6.5.0 aee067f4a241 299MB docker.elastic.co/kibana/kibana 6.2.4 327c6538ba4c 933MB docker.elastic.co/elasticsearch/elasticsearch 6.2.4 7cb69da7148d 515MB docker.elastic.co/beats/filebeat 6.2.4 26a00abcde82 319MB docker.elastic.co/kibana/kibana 5.6.13 59fcc69d2cc6 653MB docker.elastic.co/elasticsearch/elasticsearch 5.6.13 21673573a265 525MB docker.elastic.co/beats/filebeat 5.6.13 2aec30f6b3fc 284MB docker.elastic.co/kibana/kibana 5.3.3 ffe778f7e489 679MB docker.elastic.co/elasticsearch/elasticsearch 5.3.3 5857f98b5920 165MB docker.elastic.co/beats/filebeat 5.3.3 c01be8a8f630 232MB

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5.3 5.6 6.2 6.5 ES 165MB 525MB 515MB 774MB Kibana 679MB 653MB 933MB 727MB Filebeat 232MB 284MB 319MB 299MB

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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*, OSS * Default

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Future

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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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Zombies ideas that should have been killed by evidence, but keep shambling along

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6 and 6.4?

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What's in a tag? docker.elastic.co/elasticsearch/elasticsearch 5.3.3 5857f98b5920 4 months ago docker.elastic.co/beats/filebeat 5.3.3 c01be8a8f630 5 months ago docker.elastic.co/kibana/kibana 5.3.3 ffe778f7e489 5 months ago

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Currently Overwrite tag

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Label Schema LABEL 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 & Stability

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Run Elasticsearch as root

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Cockroaches claims that disappear for a while when proved wrong, but just keep on coming back

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Mode Production: Clusterable Development: Local network

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"Docker" mode discovery.type=single-node

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Bootstrap checks are here to stay

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6.0+ no more default credentials

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6.x Security non-trial requires certificates

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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 mutate the bind mounted local directory

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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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infinity https://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' 1048576 1048576 unlimited unlimited

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Limit for virtual memory? vm.max_map_count

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Test $ docker run --rm centos:7 /bin/bash -c \ 'sysctl vm.max_map_count' vm.max_map_count = 262144 Must be set on the host

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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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Customization

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Feature Request if [ -f /custom/user_init.sh ] then . /custom/user_init.sh fi Or customization through environment variables

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No Runtime Mutation

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Dockerfile ARG ELASTIC_VERSION FROM docker.elastic.co/elasticsearch/elasticsearch:${ELASTIC_VERSION} RUN bin/elasticsearch-plugin install analysis-phonetic --batch ARG ELASTIC_VERSION RUN bin/elasticsearch-plugin install \ https://github.com/spinscale/elasticsearch-ingest-langdetect/releases/download/ ${ELASTIC_VERSION}.1/ingest-langdetect-${ELASTIC_VERSION}.1.zip --batch

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Generate Keystore $ docker run -p 9200:9200 -p 9300:9300 -e "discovery.type=single-node" \ -v /Users/philipp/Desktop/demo/config/:/usr/share/elasticsearch/config/ \ -it docker.elastic.co/elasticsearch/elasticsearch:6.4.3 /bin/bash [root@1006ed50b646 elasticsearch]# ./bin/elasticsearch-keystore create Created elasticsearch keystore in /usr/share/elasticsearch/config [root@1006ed50b646 elasticsearch]# ./bin/elasticsearch-keystore add test Enter value for test: [root@1006ed50b646 elasticsearch]# exit exit $ cat config/elasticsearch.keystore ??lelasticsearch.keystore?@g?o!?$?K?Lf?w?VAEŠԨm?[?a6?B??? y?,!В}??Ħ?ǣ?AU=?C?:?o? ?W?O8?}U?;p?ӷ???cQ????7?JY? 2A?:???ZUY??2V?9?ϧ??(??0?q\

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Mount Keystore (Docker Compose) elasticsearch: image: docker.elastic.co/elasticsearch/elasticsearch:${ELASTIC_VERSION} secrets: - source: elasticsearch.keystore target: /usr/share/elasticsearch/config/elasticsearch.keystore

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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 orchestration yet

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Kubernetes 1.8 allows dots in env vars https://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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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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Quick Quiz What do you get?

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docker pull elastic/elasticsearch

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$ docker pull elastic/elasticsearch Using default tag: latest Error response from daemon: manifest for elastic/elasticsearch:latest not found

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docker pull logstash:alpine

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docker pull metricbeat:6.4.3

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$ docker pull metricbeat:6.4.3 Error response from daemon: pull access denied for metricbeat, repository does not exist or may require 'docker login'