rocketmq 4.8 version ubuntu20 server installation record

rocketmq installation record

problems encountered

• The startup error is reported as follows

Unrecognized option: -Xlog:gc*:file=/dev/shm/rmq_srv_gc_%p_%t.log:time,tags:filecount=5,filesize=30M
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.

This is because of the BUG of the startup script, which misjudged the JDK version. Mine is version 1.8, so comment the following code to
bin/runserver.shfile .
The modified content is as follows

choose_gc_options()
{
    
    
    # Example of JAVA_MAJOR_VERSION value : '1', '9', '10', '11', ...
    # '1' means releases befor Java 9
    JAVA_MAJOR_VERSION=$("$JAVA" -version 2>&1 | sed -E -n 's/.* version "([0-9]*).*$/\1/p')
#    if [[ "$JAVA_MAJOR_VERSION" -lt "9" ]] ; then
      JAVA_OPT="${JAVA_OPT} -XX:+UseConcMarkSweepGC -XX:+UseCMSCompactAtFullCollection -XX:CMSInitiatingOccupancyFraction=70 -XX:+CMSParallelRemarkEnabled -XX:SoftRefLRUPolicyMSPerMB=0 -XX:+CMSClassUnloadingEnabled -XX:SurvivorRatio=8 -XX:-UseParNewGC"
      JAVA_OPT="${JAVA_OPT} -verbose:gc -Xloggc:${GC_LOG_DIR}/rmq_srv_gc_%p_%t.log -XX:+PrintGCDetails"
      JAVA_OPT="${JAVA_OPT} -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=5 -XX:GCLogFileSize=30m"
#    else
#      JAVA_OPT="${JAVA_OPT} -XX:+UseG1GC -XX:G1HeapRegionSize=16m -XX:G1ReservePercent=25 -XX:InitiatingHeapOccupancyPercent=30 -XX:SoftRefLRUPolicyMSPerMB=0"
#      JAVA_OPT="${JAVA_OPT} -Xlog:gc*:file=${GC_LOG_DIR}/rmq_srv_gc_%p_%t.log:time,tags:filecount=5,filesize=30M"
#    fi
}

Just comment out the judgment

• The machine with small memory cannot start, because the memory configuration in the startup configuration is too large, and the memory above 4g, just change it to a smaller size. Modify the
  file bin/runserver.shModify
  JAVA_OPT="${JAVA_OPT} -server -Xms256m -Xmx500m -Xmn500g -XX:MetaspaceSize=64m -XX:MaxMetaspaceSize=128m"
  the bin/runbroker.shfile
  JAVA_OPT="${JAVA_OPT} -server -Xms128m -Xmx256m -Xmn256m"

start command

cd /home/virde/program/rocketmq-all-4.8.0-bin-release

-- 启动namesrv
nohup sh ./bin/mqnamesrv >> ./logs/namesrv.log &

-- 启动broker
nohup sh bin/mqbroker -n localhost:9876 >> ./logs/mqbroker.log &