From 387f824fd9f4ce6e1693b43eec9fc35867fc9f3e Mon Sep 17 00:00:00 2001
From: Michael Rumpf <michael@rumpfonline.de>
Date: Wed, 2 May 2018 14:39:46 +0200
Subject: [PATCH] Reduce memory consumption of Docker images #76 (#77)
* Reduce memory consumption of Docker images #76
The fix switches from an outdated Oracle Java 8 Docker image
to the current openjdk:8 image. The Java VM of this image
supports the parameters to make the Java VM Docker aware.
With this option it becomes possible to set the memory
limit to 256MB which reduces the memory consumption by
75% and leaves the application still operational.
* Added a NOTE about the Docker VM resource usage on Mac and Win
This closes #76 and hopefully improves the first time user-experience
of the Docker compose way of running the demo microservices.
---
README.md | 3 +++
docker-compose.yml | 22 +++++++++++++++-------
docker/Dockerfile | 4 ++--
3 files changed, 20 insertions(+), 9 deletions(-)
diff --git a/README.md b/README.md
index d78fe3dd..e4cb3c3a 100644
--- a/README.md
+++ b/README.md
@@ -27,6 +27,9 @@ After starting services it takes a while for API Gateway to be in sync with serv
so don't be scared of initial Zuul timeouts. You can track services availability using Eureka dashboard
available by default at http://localhost:8761.
+*NOTE: Under MacOSX or Windows, make sure that the Docker VM has enough memory to run the microservices. The default settings
+are usually not enough and make the `docker-compose up` painfully slow.*
+
## Understanding the Spring Petclinic application with a few diagrams
<a href="https://speakerdeck.com/michaelisvy/spring-petclinic-sample-application">See the presentation here</a>
diff --git a/docker-compose.yml b/docker-compose.yml
index 41e20f16..a0b1f3d1 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -3,23 +3,26 @@ services:
config-server:
image: mszarlinski/spring-petclinic-config-server
container_name: config-server
+ mem_limit: 256M
ports:
- 8888:8888
discovery-server:
image: mszarlinski/spring-petclinic-discovery-server
container_name: discovery-server
+ mem_limit: 256M
links:
- config-server
depends_on:
- config-server
- entrypoint: ["./wait-for-it.sh","config-server:8888","--timeout=60","--","java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]
+ entrypoint: ["./wait-for-it.sh","config-server:8888","--timeout=60","--","java", "-XX:+UnlockExperimentalVMOptions", "-XX:+UseCGroupMemoryLimitForHeap", "-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]
ports:
- 8761:8761
customers-service:
image: mszarlinski/spring-petclinic-customers-service
container_name: customers-service
+ mem_limit: 256M
links:
- config-server
- discovery-server
@@ -27,13 +30,14 @@ services:
depends_on:
- config-server
- discovery-server
- entrypoint: ["./wait-for-it.sh","discovery-server:8761","--timeout=60","--","java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]
+ entrypoint: ["./wait-for-it.sh","discovery-server:8761","--timeout=60","--","java", "-XX:+UnlockExperimentalVMOptions", "-XX:+UseCGroupMemoryLimitForHeap", "-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]
ports:
- 8081:8081
visits-service:
image: mszarlinski/spring-petclinic-visits-service
container_name: visits-service
+ mem_limit: 256M
links:
- config-server
- discovery-server
@@ -41,13 +45,14 @@ services:
depends_on:
- config-server
- discovery-server
- entrypoint: ["./wait-for-it.sh","discovery-server:8761","--timeout=60","--","java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]
+ entrypoint: ["./wait-for-it.sh","discovery-server:8761","--timeout=60","--","java", "-XX:+UnlockExperimentalVMOptions", "-XX:+UseCGroupMemoryLimitForHeap", "-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]
ports:
- 8082:8082
vets-service:
image: mszarlinski/spring-petclinic-vets-service
container_name: vets-service
+ mem_limit: 256M
links:
- config-server
- discovery-server
@@ -55,13 +60,14 @@ services:
depends_on:
- config-server
- discovery-server
- entrypoint: ["./wait-for-it.sh","discovery-server:8761","--timeout=60","--","java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]
+ entrypoint: ["./wait-for-it.sh","discovery-server:8761","--timeout=60","--","java", "-XX:+UnlockExperimentalVMOptions", "-XX:+UseCGroupMemoryLimitForHeap", "-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]
ports:
- 8083:8083
api-gateway:
image: mszarlinski/spring-petclinic-api-gateway
container_name: api-gateway
+ mem_limit: 256M
links:
- config-server
- discovery-server
@@ -72,32 +78,34 @@ services:
depends_on:
- config-server
- discovery-server
- entrypoint: ["./wait-for-it.sh","discovery-server:8761","--timeout=60","--","java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]
+ entrypoint: ["./wait-for-it.sh","discovery-server:8761","--timeout=60","--","java", "-XX:+UnlockExperimentalVMOptions", "-XX:+UseCGroupMemoryLimitForHeap", "-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]
ports:
- 8080:8080
tracing-server:
image: mszarlinski/spring-petclinic-tracing-server
container_name: tracing-server
+ mem_limit: 256M
links:
- config-server
- discovery-server
depends_on:
- config-server
- discovery-server
- entrypoint: ["./wait-for-it.sh","discovery-server:8761","--timeout=60","--","java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]
+ entrypoint: ["./wait-for-it.sh","discovery-server:8761","--timeout=60","--","java", "-XX:+UnlockExperimentalVMOptions", "-XX:+UseCGroupMemoryLimitForHeap", "-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]
ports:
- 9411:9411
admin-server:
image: mszarlinski/spring-petclinic-admin-server
container_name: admin-server
+ mem_limit: 256M
links:
- config-server
- discovery-server
depends_on:
- config-server
- discovery-server
- entrypoint: ["./wait-for-it.sh","discovery-server:8761","--timeout=60","--","java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]
+ entrypoint: ["./wait-for-it.sh","discovery-server:8761","--timeout=60","--","java", "-XX:+UnlockExperimentalVMOptions", "-XX:+UseCGroupMemoryLimitForHeap", "-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]
ports:
- 9090:9090
diff --git a/docker/Dockerfile b/docker/Dockerfile
index 68603a51..9568454c 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -1,4 +1,4 @@
-FROM java:8
+FROM openjdk:8
VOLUME /tmp
ADD https://raw.githubusercontent.com/vishnubob/wait-for-it/master/wait-for-it.sh wait-for-it.sh
RUN bash -c 'chmod +x wait-for-it.sh'
@@ -7,4 +7,4 @@ ADD ${ARTIFACT_NAME}.jar /app.jar
ENV SPRING_PROFILES_ACTIVE docker
RUN bash -c 'touch /app.jar'
EXPOSE ${EXPOSED_PORT}
-ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]
+ENTRYPOINT ["java", "-XX:+UnlockExperimentalVMOptions", "-XX:+UseCGroupMemoryLimitForHeap", "-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]
--
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