Разработка cloud-native Java-приложений для Kubernetes, Егор Волков,Senior Java Developer
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This document provides an introduction to building cloud-native Java applications using Docker and Kubernetes. It begins by explaining how to set up the necessary tools like Java, Docker, Kompose, and Kubernetes. It then demonstrates Dockerizing a sample Java application and deploying it locally with Docker Compose. Next, it shows how to deploy the application to Kubernetes, using Kompose to generate Kubernetes manifest files. It discusses some initial challenges in exposing the application via Kubernetes and provides solutions using NodePorts and Ingress. It concludes by outlining some next steps like improving load balancing, deploying multiple instances, using namespaces, and aggregating logs.
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![Dockerization: starting small
FROM openjdk:10-jre
VOLUME /tmp
COPY target/project1-0.0.1-SNAPSHOT.jar app.jar
ENTRYPOINT ["java",
"-Djava.security.egd=file:/dev/./urandom",
"-jar",
"/app.jar"]
Run with:
gradlew clean build && docker build -t starships .
docker run -p 8443:8443 --name starships --network space-net starships:latest
Dockerfile:](https://image.slidesharecdn.com/cwjkha1-190219133243/85/cloud-native-Java-Kubernetes-Senior-Java-Developer-15-320.jpg)
![Dockerization: starting small
Caused by: java.net.ConnectException: Connection refused: connect
at java.base/java.net.DualStackPlainSocketImpl.waitForConnect(Native Method) ~[na:na]
at java.base/java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85) ~[na:na]
at java.base/java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:400) ~[na:na]
at java.base/java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:243) ~[na:na]
at java.base/java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:225) ~[na:na]
at java.base/java.net.PlainSocketImpl.connect(PlainSocketImpl.java:148) ~[na:na]
at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:402) ~[na:na]
at java.base/java.net.Socket.connect(Socket.java:591) ~[na:na]
at com.mysql.cj.protocol.StandardSocketFactory.connect(StandardSocketFactory.java:173) ~[mysql-connector-java-8.0.11.jar:8.0.11]
at com.mysql.cj.protocol.a.NativeSocketConnection.connect(NativeSocketConnection.java:66)
~[mysql-connector-java-8.0.11.jar:8.0.11]
... 58 common frames omitted
WARN 2196 --- [ restartedMain] o.h.e.j.e.i.JdbcEnvironmentInitiator : HHH000342: Could not obtain connection to query metadata :
Communications link failure
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.](https://image.slidesharecdn.com/cwjkha1-190219133243/85/cloud-native-Java-Kubernetes-Senior-Java-Developer-16-320.jpg)
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- 9. Evolution of Environments … sometimes about these also ... java version "10.0.2" 2018-07-17 Java(TM) SE Runtime Environment 18.3 (build 10.0.2+13) Java HotSpot(TM) 64-Bit Server VM 18.3 (build 10.0.2+13, mixed mode) openjdk version "9-internal" OpenJDK Runtime Environment (build 9-internal+0-2016-04-14-195246.buildd.src) OpenJDK 64-Bit Server VM (build 9-internal+0-2016-04-14-195246.buildd.src, mixed mode)
- 10. 1. As long as the JRE is the same, that we develop against - everything should be fine 2. As long as the Servlet container version is the same, that we develop against - everything should be fine 3. As long as the RDBMS version is the same, that we develop against - everything should be fine 4. … Evolution of Environments
- 11. Evolution of Environments 1. We need to solidify versions of everything (JVM, JDK/JRE, servers, servlet containers, databases, etc) 2. There’s no good way to limit Ops people from screwing everything up 3. This should be done by software, not people 4. We already have solutions for similar problems in Java world - dependency managers!
- 12. Dockerization: starting small 1. Docker to the rescue! 2. Make a snapshot of your environment 3. Redistribute and run anywhere © 4. Bake internal custom service versions and builds
- 14. Dockerization: starting small Demo Dockerfile for “Spaceships” https://github.com/wollfxp/project1/blob/master/Dockerfile
- 15. Dockerization: starting small FROM openjdk:10-jre VOLUME /tmp COPY target/project1-0.0.1-SNAPSHOT.jar app.jar ENTRYPOINT ["java", "-Djava.security.egd=file:/dev/./urandom", "-jar", "/app.jar"] Run with: gradlew clean build && docker build -t starships . docker run -p 8443:8443 --name starships --network space-net starships:latest Dockerfile:
- 16. Dockerization: starting small Caused by: java.net.ConnectException: Connection refused: connect at java.base/java.net.DualStackPlainSocketImpl.waitForConnect(Native Method) ~[na:na] at java.base/java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85) ~[na:na] at java.base/java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:400) ~[na:na] at java.base/java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:243) ~[na:na] at java.base/java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:225) ~[na:na] at java.base/java.net.PlainSocketImpl.connect(PlainSocketImpl.java:148) ~[na:na] at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:402) ~[na:na] at java.base/java.net.Socket.connect(Socket.java:591) ~[na:na] at com.mysql.cj.protocol.StandardSocketFactory.connect(StandardSocketFactory.java:173) ~[mysql-connector-java-8.0.11.jar:8.0.11] at com.mysql.cj.protocol.a.NativeSocketConnection.connect(NativeSocketConnection.java:66) ~[mysql-connector-java-8.0.11.jar:8.0.11] ... 58 common frames omitted WARN 2196 --- [ restartedMain] o.h.e.j.e.i.JdbcEnvironmentInitiator : HHH000342: Could not obtain connection to query metadata : Communications link failure The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
- 17. Dockerization: starting small This time we remember about the database! Re-Run with: gradlew clean build && docker build -t starships . docker run -p 3306:3306 -v C:/dev/docker/mysql-project1:/var/lib/mysql --env MYSQL_ROOT_PASSWORD=s3cur1ty@maks --env MYSQL_DATABASE=space --name mysql-project1 --network space-net mysql:5.6 docker run -p 8443:8443 --name starships --network space-net starships:latest
- 21. Dockerization: next steps Demo docker-compose file for “Spaceships” https://github.com/wollfxp/project1/blob/master/docker-compose.yml
- 22. Dockerization: next steps Run with: gradlew clean build && docker build -t starships . docker-compose up
- 24. Dockerization: next steps Hello, world with Kubernetes!
- 25. Kubernetes from scratch 1. Enabling Kubernetes in Docker for Windows/Docker for Mac
- 27. Kubernetes from scratch 1. Enabling Kubernetes in Docker for Windows/Docker for Mac 2. Checking that everything works
- 28. Kubernetes from scratch $ kubectl version Client Version: version.Info{Major:"1", Minor:"10", GitVersion:"v1.10.11", GitCommit:"637c7e288581ee40ab4ca210618a89a555b6e7e9", GitTreeState:"clean", BuildDate:"2018-11-26T14:38:32Z", GoVersion:"go1.9.3", Compiler:"gc", Platform:"windows/amd64"} Server Version: version.Info{Major:"1", Minor:"10", GitVersion:"v1.10.11", GitCommit:"637c7e288581ee40ab4ca210618a89a555b6e7e9", GitTreeState:"clean", BuildDate:"2018-11-26T14:25:46Z", GoVersion:"go1.9.3", Compiler:"gc", Platform:"linux/amd64"} $ kubectl get all NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE service/kubernetes ClusterIP 10.96.0.1 443/TCP 4d
- 29. Kubernetes from scratch 1. Enabling Kubernetes in Docker for Windows/Docker for Mac 2. Checking that everything works 3. Running Kompose 4. Deploy to Kubernetes
- 30. Kubernetes and Kompose demo Let’s try it! https://github.com/wollfxp/project1/tree/master-february
- 32. Kubernetes from scratch … ? Problem: we cannot reach our service! Solution: Ingress! Deploy NGINX!
- 33. Kubernetes from scratch … ? https://kubernetes.github.io/ingress-nginx/user-guide/tls/#ssl-passthrough
- 34. Kubernetes from scratch … ? Problem: we cannot reach our service! And NGINX won’t help! Solution: NodePort! Expose our service!
- 35. Kubernetes from scratch … ?
- 36. Kubernetes: next steps 1. Get rid of HTTPS in the application and use NGINX for that 2. Proper load balancing via Ingress 3. Deploy multiple types of the same instances (/app,/api,/admin) 4. Utilize namespaces to limit visibility of environments 5. Start using K8S metric API to get more info about your cluster 6. Deploy anywhere* with the same** configuration 7. Log aggregation (maybe?)
- 38. Thank you!