How to configure the memory size for docker?

How to configure the memory size for docker?

How to solve the problem of docker configuration memory size:

1. Mount the configuration file in docker

By mounting the catalina.sh configuration file of tomcat in docker to the host machine, and then using catalina.sh to configure the jvm memory size.

1. You need to re-run a tomcat container (note: the port and container name cannot be repeated)

  docker run -d \
  -v /server/webapps:/usr/local/tomcat/webapps/ \
  -v /server/catalina.sh:/usr/local/tomcat/bin/catalina.sh \
  -v /server/logs/demo:/server/logs/demo \
  -e TZ="Asia/Shanghai" \
  --privileged=true \
  --name demo \
  -p 8080:8080 \
  tomcat8

Instructions:

* -v /server /webapps:/usr/local/tomcat/webapps/ Mount the running directory of the current project to webapps under tomcat

* -v /server/catalina.sh:/usr/local /tomcat/bin/catalina.sh Mount catalina.sh of the host machine to catalina.sh under tomcat in docker

* -v /server/logs/demo:/server/ logs/demoMount logs to the host

* -e TZ="Asia/Shanghai"Set time zone

* --privileged =trueSet up to have real root permissions in the container

* -p 8080:8080 Map port

* tomcat8Mirror Name

2.catalina.sh In the configuration memory

cygwin=false, add the following:

JAVA_OPTS="-server -Xms1024m -Xmx2048m -XX:MaxNewSize =256m -XX:PermSize=128m -XX:MaxPermSize=256m"

-xms initialization heap memory

-xmx maximum heap memory

二,Directly modify the configuration of catalina.sh of the tomcat container

You can directly enter the container to modify the configuration file of catalina.sh of tomcat, but this method is not recommended. Because it is troublesome to show the hang again in the future, and it is inconvenient to configure. If you need to re-run the container, you do not know the configuration of the memory size in the container

1. Enter the container

docker exec -it <container_name> /bin/bash

2. Find the catalina.sh configuration file and add the configuration (the configuration statement added in the first step is enough)

// If there is no vi command, you need to install

vi /usr/local/tomcat/bin/catalina.sh

// Exit the container and Restart

exit

##docker restart

Recommended tutorial: "

docker video tutorial》

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