构建docker镜像部署rocketmq

构建镜像

• 下载rocketmq-docker源码
• 根据需要修改自定义启动脚本
  image-buildscripts

1. runbroker-customize.sh
2. runserver-customize.sh

这两个脚本会覆盖到容器${ROCKETMQ_HOME}/bin/路径中

• 在image-build路径执行命令

sh build-image.sh RMQ-VERSION BASE-IMAGE

支持的RocketMQ版本参数RMQ-VERSION在这里查询。
支持的基础镜像参数BASE-IMAGE有[centos, alpine]。
例如: sh build-image.sh 4.7.1 alpine

构建成功

启动服务

• 启动name server

docker run --name rmqnamesrv --restart=always -d -p 9876:9876 apacherocketmq/rocketmq:4.7.1-alpine sh mqnamesrv

• 启动broker

docker run --name rmqbroker --restart=always -d -p 10911:10911 -p 10909:10909 --link rmqnamesrv:namesrv -e "NAMESRV_ADDR=namesrv:9876" apacherocketmq/rocketmq:4.7.1-alpine sh mqbroker

启动失败

默认启动脚本会根据主机内存大小自动计算JVM堆栈参数

• runserver-customize.sh / runbroker-customize.sh

#===========================================================================================
# JVM Configuration
#===========================================================================================
calculate_heap_sizes()
{
    case "`uname`" in
        Linux)
            system_memory_in_mb=`free -m| sed -n '2p' | awk '{print $2}'`
            system_cpu_cores=`egrep -c 'processor([[:space:]]+):.*' /proc/cpuinfo`
        ;;
        FreeBSD)
            system_memory_in_bytes=`sysctl hw.physmem | awk '{print $2}'`
            system_memory_in_mb=`expr $system_memory_in_bytes / 1024 / 1024`
            system_cpu_cores=`sysctl hw.ncpu | awk '{print $2}'`
        ;;
        SunOS)
            system_memory_in_mb=`prtconf | awk '/Memory size:/ {print $3}'`
            system_cpu_cores=`psrinfo | wc -l`
        ;;
        Darwin)
            system_memory_in_bytes=`sysctl hw.memsize | awk '{print $2}'`
            system_memory_in_mb=`expr $system_memory_in_bytes / 1024 / 1024`
            system_cpu_cores=`sysctl hw.ncpu | awk '{print $2}'`
        ;;
        *)
            # assume reasonable defaults for e.g. a modern desktop or
            # cheap server
            system_memory_in_mb="2048"
            system_cpu_cores="2"
        ;;
    esac

    # some systems like the raspberry pi don't report cores, use at least 1
    if [ "$system_cpu_cores" -lt "1" ]
    then
        system_cpu_cores="1"
    fi

    # set max heap size based on the following
    # max(min(1/2 ram, 1024MB), min(1/4 ram, 8GB))
    # calculate 1/2 ram and cap to 1024MB
    # calculate 1/4 ram and cap to 8192MB
    # pick the max
    half_system_memory_in_mb=`expr $system_memory_in_mb / 2`
    quarter_system_memory_in_mb=`expr $half_system_memory_in_mb / 2`
    if [ "$half_system_memory_in_mb" -gt "1024" ]
    then
        half_system_memory_in_mb="1024"
    fi
    if [ "$quarter_system_memory_in_mb" -gt "8192" ]
    then
        quarter_system_memory_in_mb="8192"
    fi
    if [ "$half_system_memory_in_mb" -gt "$quarter_system_memory_in_mb" ]
    then
        max_heap_size_in_mb="$half_system_memory_in_mb"
    else
        max_heap_size_in_mb="$quarter_system_memory_in_mb"
    fi
    MAX_HEAP_SIZE="${max_heap_size_in_mb}M"

    # Young gen: min(max_sensible_per_modern_cpu_core * num_cores, 1/4 * heap size)
    max_sensible_yg_per_core_in_mb="100"
    max_sensible_yg_in_mb=`expr $max_sensible_yg_per_core_in_mb "*" $system_cpu_cores`

    desired_yg_in_mb=`expr $max_heap_size_in_mb / 4`

    if [ "$desired_yg_in_mb" -gt "$max_sensible_yg_in_mb" ]
    then
        HEAP_NEWSIZE="${max_sensible_yg_in_mb}M"
    else
        HEAP_NEWSIZE="${desired_yg_in_mb}M"
    fi
}

calculate_heap_sizes

# Dynamically calculate parameters, for reference.
Xms=$MAX_HEAP_SIZE
Xmx=$MAX_HEAP_SIZE
Xmn=$HEAP_NEWSIZE
# Set for `JAVA_OPT`.
JAVA_OPT="${JAVA_OPT} -server -Xms${Xms} -Xmx${Xmx} -Xmn${Xmn}"

而docker默认隔离性不足，获取系统内存得到的是宿主机内存大小，导致内存不足启动失败（例如宿主机内存32G则计算结果为8G）

解决

1. 修改启动脚本
2. 使用默认脚本，通过设置环境变量JAVA_OPT_EXT可以自定义堆栈参数

• runserver-customize.sh / runbroker-customize.sh

JAVA_OPT="${JAVA_OPT} ${JAVA_OPT_EXT}"

rocketmq-console部署参考