Linux服务器安装rocketMQ单机消息队列
首先下载rocketMQ
1.解压：
> unzip rocketmq-all-4.3.0-source-release.zip > cd rocketmq-all-4.3.0/ > mvn -Prelease-all -DskipTests clean install -U （如果下载的是二进制文件可以直接解压使用不需要编译） > cd distribution/target/apache-rocketmq
如果下载的是二进制文件可以直接解压使用不需要编译，例如：
rocketmq-all-4.3.1-bin-release.zip 二进制，不需要编译
rocketmq-all-4.3.1-source-release.zip 源码，需编译
2.Start Name Server
> nohup sh bin/mqnamesrv & > tail -f ~/logs/rocketmqlogs/namesrv.log The Name Server boot success...
3.Start Broker
> nohup sh bin/mqbroker -n localhost:9876 & > tail -f ~/logs/rocketmqlogs/broker.log The broker[%s, 172.30.30.233:10911] boot success...
4.Send & Receive Messages
> export NAMESRV_ADDR=localhost:9876 > sh bin/tools.sh org.apache.rocketmq.example.quickstart.Producer SendResult [sendStatus=SEND_OK, msgId= ... > sh bin/tools.sh org.apache.rocketmq.example.quickstart.Consumer ConsumeMessageThread_%d Receive New Messages: [MessageExt...
5.Shutdown Servers
> sh bin/mqshutdown broker The mqbroker(36695) is running... Send shutdown request to mqbroker(36695) OK > sh bin/mqshutdown namesrv The mqnamesrv(36664) is running... Send shutdown request to mqnamesrv(36664) OK
如果遇到在启动服务报内存不足，如下的错误：
There is insufficient memory for the Java Runtime Environment to continue.
There is insufficient memory for the Java Runtime Environment to continue.
Native memory allocation (mmap) failed to map 8589934592 bytes for committing reserved memory.
Possible reasons:
The system is out of physical RAM or swap space
In 32 bit mode, the process size limit was hit
Possible solutions:
Reduce memory load on the system
Increase physical memory or swap space
Check if swap backing store is full
Use 64 bit Java on a 64 bit OS
Decrease Java heap size (-Xmx/-Xms)
Decrease number of Java threads
Decrease Java thread stack sizes (-Xss)
Set larger code cache with -XX:ReservedCodeCacheSize=
This output file may be truncated or incomplete.
Out of Memory Error (os_linux.cpp:2640), pid=2428, tid=0x00007fada5259700
JRE version: (8.0_172-b11) (build )
Java VM: Java HotSpot(TM) 64-Bit Server VM (25.172-b11 mixed mode linux-amd64 compressed oops)
解决：
java运行时环境的内存不足，无法继续，本机内存分配（mmap）未能映射8589934592字节，用于提交保留内存
解决办法，找到runserver.sh和runbroker.sh，编辑
JAVA_OPT=”${JAVA_OPT} -server -Xms256m -Xmx256m -Xmn125m -XX:MetaspaceSize=128m -XX:MaxMetaspaceSize=320m”
改成如上就可以了
