dockerfile指定jvm参数

实例

FROM java:8
VOLUME /tmp
ADD app.jar app.jar
RUN bash -c 'touch /app.jar'
EXPOSE 9001
ENV JAVA_OPTS="
-server 
-Xmx4g 
-Xms4g 
-Xmn2g 
-XX:SurvivorRatio=8 
-XX:MetaspaceSize=256m 
-XX:MaxMetaspaceSize=512m 
-XX:+UseParallelGC 
-XX:ParallelGCThreads=4 
-XX:+UseParallelOldGC 
-XX:+UseAdaptiveSizePolicy 
-XX:+PrintGCDetails 
-XX:+PrintTenuringDistribution 
-XX:+PrintGCTimeStamps 
-XX:+HeapDumpOnOutOfMemoryError 
-XX:HeapDumpPath=/ 
-Xloggc:/gc.log 
-XX:+UseGCLogFileRotation 
-XX:NumberOfGCLogFiles=5 
-XX:GCLogFileSize=10M"
ENTRYPOINT java ${JAVA_OPTS} -Djava.security.egd=file:/dev/./urandom -jar /app.jar

不过这种方式在dockerfile写死了不灵活，不是很推荐，特别是要区分env的应用来说。

docker run指定

docker run --rm -e JAVA_OPTS='-Xmx1g' tomcat

docker-compose方式指定

environment:
- JVM_OPTS=-Xmx12g -Xms12g -XX:MaxPermSize=1024m

k8s指定

apiVersion: v1
kind: ReplicationController
metadata:
labels:
app: jenkins
role: master
version: v1
name: jenkins-master
namespace: jenkins
spec:
replicas: 1
selector:
app: jenkins
role: master
version: v1
template:
metadata:
labels:
app: jenkins
role: master
version: v1
spec:
containers:
- env:
- name: JENKINS_OPTS
value: --prefix=
- name: JAVA_OPTS
value: -Djava.awt.headless=true -Xmx200m -Dcom.sun.management.jmxremote=
-Dcom.sun.management.jmxremote.port=1099 -Dcom.sun.management.jmxremote.ssl=false
-Dcom.sun.management.jmxremote.authenticate=false
image: jenkins:2.7.2
name: jenkins
ports:
- containerPort: 8080
name: web
- containerPort: 50000
name: leader
resources:
limits:
cpu: 1000m
memory: 800Mi
requests:
cpu: 100m
memory: 400Mi
volumeMounts:
- mountPath: /var/jenkins_home
name: jenkins-master
nodeSelector:
worker: "true"
volumes:
- name: jenkins-master
nfs:
path: /data/jenkins-master
server: '{{nfs_server}}'

doc

• How to set Java heap size (Xms/Xmx) inside Docker container?

• jenkins-master-rc.yaml