rabbitmq3.4.2 shell脚本分析

rabbitmq3.4.2 shell脚本分析	http://aperise.iteye.com/blog/2346584
rabbitmq3.4.2单机安装和集群安装	http://aperise.iteye.com/blog/2346179
rabbitmq3.4.1脑裂问题(转载)	http://blog.csdn.net/u013256816/article/details/53291907
spring-amqp官方文档(转载)	http://projects.spring.io/spring-amqp/#quick-start
spring-amqp在GITHUB源码(转载)	https://github.com/spring-projects/spring-amqp

• rabbitmq3.4.2提供了哪些shell脚本？脚本之间调用关系？
• rabbitmq3.4.2各个shell脚本详细解析？
• rabbitmq3.4.2的默认配置文件在哪里？默认插件放在哪里？日志放在哪里？
• 为什么有了rabitmqctl还需要RabbitMQ Management plugin？
• Rattitmq Management plugin提供了哪些功能?

1.rabbitmq3.4.2提供了哪些shell脚本？脚本之间调用关系？

    这里安装的rabbitmq版本为3.4.2，安装方式是编译安装，安装位于目录/opt/rabbitmq-3.4.2，在/opt/rabbitmq-server-3.4.2/sbin下面提供了如下5个shell脚本：

脚本	说明
rabbitmq-defaults	shell脚本，初始化关键的配置默认信息
rabbitmq-env	shell脚本，设置运行环境各种默认配置
rabbitmqctl	rabbitmqctl本质是shell脚本里通过erl运行程序 /opt//opt/rabbitmq-server-3.4.2 /ebin/rabbit_control_main.beam这个erlang程序
rabbitmq-plugins	rabbitmq-plugins本质是shell脚本里通过erl运行 /opt/rabbitmq-server-3.4.2 /ebin/rabbit_plugins.beam这个erlang程序
rabbitmq-server	rabbitmq-server本质是shell通过erl运行 /opt/rabbitmq-server-3.4.2 /ebin/rrabbit.beam这个erlang程序

 

    从上面图可以看出：5个脚本其实平时用到最多的是rabbitmqctl、rabbitmq-server、rabbitmq-plugins，而rabbitmq-env和rabbitmq-defaults是前面3个脚本的运行前提，主要提供运行环境的初始设置和整个环境的默认设置，在用户未做任何配置情况下，这些脚本本身就考虑到了很多默认设置，方便用户使用，在必要时候提醒相关错误信息

 

2.rabbitmq3.4.2各个shell脚本详细解析？

    2.1 linux中shell变量的含义: 

• $$      Shell本身的PID（ProcessID） 
• $!      Shell最后运行的后台Process的PID 
• $?      最后运行的命令的结束代码（返回值） 
• $-      使用Set命令设定的Flag一览 
• $*      所有参数列表。如"$*"用「"」括起来的情况、以"$1 $2 … $n"的形式输出所有参数。 
• $@      所有参数列表。如"$@"用「"」括起来的情况、以"$1" "$2" … "$n" 的形式输出所有参数。 
• $#      添加到Shell的参数个数 
• $0      Shell本身的文件名 
• $1～$n  添加到Shell的各参数值。$1是第1参数、$2是第2参数…。 

    2.2 rabbitmq-defaults

#!/bin/sh -e
##  The contents of this file are subject to the Mozilla Public License
##  Version 1.1 (the "License"); you may not use this file except in
##  compliance with the License. You may obtain a copy of the License
##  at http://www.mozilla.org/MPL/
##
##  Software distributed under the License is distributed on an "AS IS"
##  basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
##  the License for the specific language governing rights and
##  limitations under the License.
##
##  The Original Code is RabbitMQ.
##
##  The Initial Developer of the Original Code is GoPivotal, Inc.
##  Copyright (c) 2012-2014 GoPivotal, Inc.  All rights reserved.
##

### next line potentially updated in package install steps
SYS_PREFIX=

### next line will be updated when generating a standalone release
ERL_DIR=

CLEAN_BOOT_FILE=start_clean
SASL_BOOT_FILE=start_sasl

## Set default values

# 继承rabbitmq-env已有配置的子配置文件，注意不是目录
CONFIG_FILE=${SYS_PREFIX}/etc/rabbitmq/rabbitmq
# 日志文件目录，注意不是文件
LOG_BASE=${SYS_PREFIX}/var/log/rabbitmq
# 数据库目录，注意不是文件
MNESIA_BASE=${SYS_PREFIX}/var/lib/rabbitmq/mnesia
# 记录启用的插件的文件，注意不是目录
ENABLED_PLUGINS_FILE=${SYS_PREFIX}/etc/rabbitmq/enabled_plugins

# 插件所在目录
PLUGINS_DIR="${RABBITMQ_HOME}/plugins"

# rabbitmq相关环境配置文件
CONF_ENV_FILE=${SYS_PREFIX}/etc/rabbitmq/rabbitmq-env.conf

    这里为了打印rabbitmq-defaults里的变量值，故在rabbitmq-defaults文件里末尾追加如下脚本，如下：

echo "SYS_PREFIX:"${SYS_PREFIX}
echo "CLEAN_BOOT_FILE:"${CLEAN_BOOT_FILE}
echo "SASL_BOOT_FILE:"${SASL_BOOT_FILE}
echo "CONFIG_FILE:"${CONFIG_FILE}
echo "LOG_BASE:"${LOG_BASE}
echo "MNESIA_BASE:"${MNESIA_BASE}
echo "ENABLED_PLUGINS_FILE:"${ENABLED_PLUGINS_FILE}
echo "PLUGINS_DIR:"${PLUGINS_DIR}
echo "CONF_ENV_FILE:"${CONF_ENV_FILE}

    然后执行rabbitmq-defaults得到的结果如下：

[root@slavery01 sbin]# rabbitmq-defaults 
SYS_PREFIX:
CLEAN_BOOT_FILE:start_clean
SASL_BOOT_FILE:start_sasl
CONFIG_FILE:/etc/rabbitmq/rabbitmq
LOG_BASE:/var/log/rabbitmq
MNESIA_BASE:/var/lib/rabbitmq/mnesia
ENABLED_PLUGINS_FILE:/etc/rabbitmq/enabled_plugins
PLUGINS_DIR:/plugins
CONF_ENV_FILE:/etc/rabbitmq/rabbitmq-env.conf
[root@slavery01 sbin]# 

    说明：

• sbin/rabbitmq-defaults主要初始化了几个重要的变量值，这些值如果你要修改，请不要修改文件sbin/rabbitmq-defaults文件，这个文件是初始化的默认值，要覆盖的话，请在文件/etc/rabbitmq/rabbitmq文件中进行修改；
• 如果安装完后rabbitmq不做任何配置，默认rabbitmq的配置文件为/etc/rabbitmq/rabbitmq，环境配置文件为/etc/rabbitmq/rabbitmq-env.conf，日志放置目录为/var/log/rabbitmq ，数据持久化目录为/var/lib/rabbitmq/mnesia，启用的插件目录位于/etc/rabbitmq/enabled_plugins
• 上面这些默认配置很关键，在很多博客是一上来就生硬的告诉读者去/etc/rabbitmq目录配置rabbitmq相关信息，所以学习任何一门开源框架技术，搞懂其脚本调用关系和脚本详细执行过程，特别是里面的变量，对于快速学习非常重要。

 

    2.3 rabbitmq-env

#!/bin/sh -e
#shell编程是以"#"为注释，但对"#!/bin/sh"却不是。"#!/bin/sh"是对shell的声明，说明你所用的是那种类型的shell及其路径所在。
##  The contents of this file are subject to the Mozilla Public License
##  Version 1.1 (the "License"); you may not use this file except in
##  compliance with the License. You may obtain a copy of the License
##  at http://www.mozilla.org/MPL/
##
##  Software distributed under the License is distributed on an "AS IS"
##  basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
##  the License for the specific language governing rights and
##  limitations under the License.
##
##  The Original Code is RabbitMQ.
##
##  The Initial Developer of the Original Code is GoPivotal, Inc.
##  Copyright (c) 2007-2014 GoPivotal, Inc.  All rights reserved.
##

# We set +e here since since our test for "readlink -f" below needs to
# be able to fail.
set +e
# Determine where this script is really located (if this script is
# invoked from another script, this is the location of the caller)
SCRIPT_PATH="$0"    #shell自身的文件名，这里指/opt/rabbitmq-server-3.4.2/sbin/rabbitmq-env
while [ -h "$SCRIPT_PATH" ] ; do    # -h 用于判定是否为符号链接
    # Determine if readlink -f is supported at all. TODO clean this up.
    # readlink -f 获取符号链接 rabbitmq-env 所对应的完整路径 /opt/rabbitmq-server-3.4.2/sbin/rabbitmq-env
    FULL_PATH=`readlink -f $SCRIPT_PATH 2>/dev/null`
    if [ "$?" != "0" ]; then     # 判定上一步执行结果是否为成功
      REL_PATH=`readlink $SCRIPT_PATH`    #执行readlink获取符号链接rabbitmq-env所对应的相对路径 ../sbin/rabbitmq-env
      #正则表达式判定 $REL_PATH 是不是以 '/' 开头
      if expr "$REL_PATH" : '/.*' > /dev/null; then
        SCRIPT_PATH="$REL_PATH"    #如果是以 '/' 开头
      else
        SCRIPT_PATH="`dirname "$SCRIPT_PATH"`/$REL_PATH"    #如果不是以 '/' 开头
      fi
    else
      SCRIPT_PATH=$FULL_PATH
    fi
done
set -e

SCRIPT_DIR=`dirname $SCRIPT_PATH`    # 得到 SCRIPT_DIR = /opt/rabbitmq-server-3.4.2/sbin
RABBITMQ_HOME="${SCRIPT_DIR}/.."     # 得到 RABBITMQ_HOME = /opt/rabbitmq-server-3.4.2/sbin/..

## Set defaults
. ${SCRIPT_DIR}/rabbitmq-defaults    # 调用并执行脚本rabbitmq-defaults

## Common defaults
# 默认的通用配置选项SERVER_ERL_ARGS=+K true +A30 +P 1048576 -kernel inet_default_connect_options [{nodelay,true}]
SERVER_ERL_ARGS="+K true +A30 +P 1048576 \
  -kernel inet_default_connect_options [{nodelay,true}]"    

# warn about old rabbitmq.conf file, if no new one
if [ -f /etc/rabbitmq/rabbitmq.conf ] && \
   [ ! -f ${CONF_ENV_FILE} ] ; then
    echo -n "WARNING: ignoring /etc/rabbitmq/rabbitmq.conf -- "
    echo "location has moved to ${CONF_ENV_FILE}"
fi

## Get configuration variables from the configure environment file
[ -f ${CONF_ENV_FILE} ] && . ${CONF_ENV_FILE} || true

[ "x" = "x$RABBITMQ_USE_LONGNAME" ] && RABBITMQ_USE_LONGNAME=${USE_LONGNAME}
if [ "xtrue" = "x$RABBITMQ_USE_LONGNAME" ] ; then
    RABBITMQ_NAME_TYPE=-name
    [ "x" = "x$HOSTNAME" ] && HOSTNAME=`env hostname --fqdn`
    [ "x" = "x$NODENAME" ] && NODENAME=rabbit@${HOSTNAME}
else
    RABBITMQ_NAME_TYPE=-sname
    [ "x" = "x$HOSTNAME" ] && HOSTNAME=`env hostname`
    [ "x" = "x$NODENAME" ] && NODENAME=rabbit@${HOSTNAME%%.*}
fi

##--- Set environment vars RABBITMQ_<var_name> to defaults if not set
#如果相关参数没有配置那么表达式"x" = "x$参数KEY"永远成立，则设置相关参数的默认值
DEFAULT_NODE_IP_ADDRESS=auto
DEFAULT_NODE_PORT=5672
[ "x" = "x$RABBITMQ_NODE_IP_ADDRESS" ] && RABBITMQ_NODE_IP_ADDRESS=${NODE_IP_ADDRESS}
[ "x" = "x$RABBITMQ_NODE_PORT" ] && RABBITMQ_NODE_PORT=${NODE_PORT}

[ "x" = "x$RABBITMQ_NODE_IP_ADDRESS" ] && [ "x" != "x$RABBITMQ_NODE_PORT" ] && RABBITMQ_NODE_IP_ADDRESS=${DEFAULT_NODE_IP_ADDRESS}
[ "x" != "x$RABBITMQ_NODE_IP_ADDRESS" ] && [ "x" = "x$RABBITMQ_NODE_PORT" ] && RABBITMQ_NODE_PORT=${DEFAULT_NODE_PORT}

[ "x" = "x$RABBITMQ_DIST_PORT" ] && RABBITMQ_DIST_PORT=${DIST_PORT}
[ "x" = "x$RABBITMQ_DIST_PORT" ] && [ "x" = "x$RABBITMQ_NODE_PORT" ] && RABBITMQ_DIST_PORT=$((${DEFAULT_NODE_PORT} + 20000))
[ "x" = "x$RABBITMQ_DIST_PORT" ] && [ "x" != "x$RABBITMQ_NODE_PORT" ] && RABBITMQ_DIST_PORT=$((${RABBITMQ_NODE_PORT} + 20000))

[ "x" = "x$RABBITMQ_NODENAME" ] && RABBITMQ_NODENAME=${NODENAME}
[ "x" = "x$RABBITMQ_SERVER_ERL_ARGS" ] && RABBITMQ_SERVER_ERL_ARGS=${SERVER_ERL_ARGS}
[ "x" = "x$RABBITMQ_CONFIG_FILE" ] && RABBITMQ_CONFIG_FILE=${CONFIG_FILE}
[ "x" = "x$RABBITMQ_LOG_BASE" ] && RABBITMQ_LOG_BASE=${LOG_BASE}
[ "x" = "x$RABBITMQ_MNESIA_BASE" ] && RABBITMQ_MNESIA_BASE=${MNESIA_BASE}
[ "x" = "x$RABBITMQ_SERVER_START_ARGS" ] && RABBITMQ_SERVER_START_ARGS=${SERVER_START_ARGS}
[ "x" = "x$RABBITMQ_SERVER_ADDITIONAL_ERL_ARGS" ] && RABBITMQ_SERVER_ADDITIONAL_ERL_ARGS=${SERVER_ADDITIONAL_ERL_ARGS}
[ "x" = "x$RABBITMQ_MNESIA_DIR" ] && RABBITMQ_MNESIA_DIR=${MNESIA_DIR}
[ "x" = "x$RABBITMQ_MNESIA_DIR" ] && RABBITMQ_MNESIA_DIR=${RABBITMQ_MNESIA_BASE}/${RABBITMQ_NODENAME}

[ "x" = "x$RABBITMQ_PID_FILE" ] && RABBITMQ_PID_FILE=${PID_FILE}
[ "x" = "x$RABBITMQ_PID_FILE" ] && RABBITMQ_PID_FILE=${RABBITMQ_MNESIA_DIR}.pid

[ "x" = "x$RABBITMQ_PLUGINS_EXPAND_DIR" ] && RABBITMQ_PLUGINS_EXPAND_DIR=${PLUGINS_EXPAND_DIR}
[ "x" = "x$RABBITMQ_PLUGINS_EXPAND_DIR" ] && RABBITMQ_PLUGINS_EXPAND_DIR=${RABBITMQ_MNESIA_BASE}/${RABBITMQ_NODENAME}-plugins-expand

[ "x" = "x$RABBITMQ_ENABLED_PLUGINS_FILE" ] && RABBITMQ_ENABLED_PLUGINS_FILE=${ENABLED_PLUGINS_FILE}

[ "x" = "x$RABBITMQ_PLUGINS_DIR" ] && RABBITMQ_PLUGINS_DIR=${PLUGINS_DIR}

## Log rotation
[ "x" = "x$RABBITMQ_LOGS" ] && RABBITMQ_LOGS=${LOGS}
[ "x" = "x$RABBITMQ_LOGS" ] && RABBITMQ_LOGS="${RABBITMQ_LOG_BASE}/${RABBITMQ_NODENAME}.log"
[ "x" = "x$RABBITMQ_SASL_LOGS" ] && RABBITMQ_SASL_LOGS=${SASL_LOGS}
[ "x" = "x$RABBITMQ_SASL_LOGS" ] && RABBITMQ_SASL_LOGS="${RABBITMQ_LOG_BASE}/${RABBITMQ_NODENAME}-sasl.log"

[ "x" = "x$RABBITMQ_CTL_ERL_ARGS" ] && RABBITMQ_CTL_ERL_ARGS=${CTL_ERL_ARGS}

##--- End of overridden <var_name> variables

    这里为了打印rabbitmq-env里的变量值，故在rabbitmq-env文件里末尾追加如下脚本，如下：

echo "SCRIPT_PATH:"${SCRIPT_PATH}
echo "SCRIPT_DIR:"${SCRIPT_DIR}
echo "RABBITMQ_HOME:"${RABBITMQ_HOME}
echo "SERVER_ERL_ARGS:"${SERVER_ERL_ARGS}
echo "CONF_ENV_FILE:"${CONF_ENV_FILE}
echo "RABBITMQ_USE_LONGNAME:"${RABBITMQ_USE_LONGNAME}
echo "HOSTNAME:"${HOSTNAME}
echo "NODENAME:"${NODENAME}
echo "RABBITMQ_NODE_IP_ADDRESS:"${RABBITMQ_NODE_IP_ADDRESS}
echo "RABBITMQ_NODE_PORT:"${RABBITMQ_NODE_PORT}
echo "RABBITMQ_DIST_PORT:"${RABBITMQ_DIST_PORT}
echo "RABBITMQ_NODENAME:"${RABBITMQ_NODENAME}
echo "RABBITMQ_SERVER_ERL_ARGS:"${RABBITMQ_SERVER_ERL_ARGS}
echo "RABBITMQ_CONFIG_FILE:"${RABBITMQ_CONFIG_FILE}
echo "RABBITMQ_LOG_BASE:"${RABBITMQ_LOG_BASE}
echo "RABBITMQ_MNESIA_BASE:"${RABBITMQ_MNESIA_BASE}
echo "RABBITMQ_SERVER_START_ARGS:"${RABBITMQ_SERVER_START_ARGS}
echo "RABBITMQ_SERVER_ADDITIONAL_ERL_ARGS:"${RABBITMQ_SERVER_ADDITIONAL_ERL_ARGS}
echo "RABBITMQ_MNESIA_DIR:"${RABBITMQ_MNESIA_DIR}
echo "RABBITMQ_PID_FILE:"${RABBITMQ_PID_FILE}
echo "RABBITMQ_PLUGINS_EXPAND_DIR:"${RABBITMQ_PLUGINS_EXPAND_DIR}
echo "RABBITMQ_ENABLED_PLUGINS_FILE:"${RABBITMQ_ENABLED_PLUGINS_FILE}
echo "RABBITMQ_PLUGINS_DIR:"${RABBITMQ_PLUGINS_DIR}
echo "RABBITMQ_LOGS:"${RABBITMQ_LOGS}
echo "RABBITMQ_SASL_LOGS:"${RABBITMQ_SASL_LOGS}
echo "RABBITMQ_CTL_ERL_ARGS:"${RABBITMQ_CTL_ERL_ARGS}

    然后执行rabbitmq-env得到的结果如下：

[root@slavery01 sbin]# rabbitmq-env 
SCRIPT_PATH:/opt/rabbitmq-server-3.4.2/sbin/rabbitmq-env
SCRIPT_DIR:/opt/rabbitmq-server-3.4.2/sbin
RABBITMQ_HOME:/opt/rabbitmq-server-3.4.2/sbin/..
SERVER_ERL_ARGS:+K true +A30 +P 1048576 -kernel inet_default_connect_options [{nodelay,true}]
CONF_ENV_FILE:/etc/rabbitmq/rabbitmq-env.conf
RABBITMQ_USE_LONGNAME:
HOSTNAME:slavery01
NODENAME:rabbit@slavery01
RABBITMQ_NODE_IP_ADDRESS:
RABBITMQ_NODE_PORT:
RABBITMQ_DIST_PORT:25672
RABBITMQ_NODENAME:rabbit@slavery01
RABBITMQ_SERVER_ERL_ARGS:+K true +A30 +P 1048576 -kernel inet_default_connect_options [{nodelay,true}]
RABBITMQ_CONFIG_FILE:/etc/rabbitmq/rabbitmq
RABBITMQ_LOG_BASE:/var/log/rabbitmq
RABBITMQ_MNESIA_BASE:/var/lib/rabbitmq/mnesia
RABBITMQ_SERVER_START_ARGS:
RABBITMQ_SERVER_ADDITIONAL_ERL_ARGS:
RABBITMQ_MNESIA_DIR:/var/lib/rabbitmq/mnesia/rabbit@slavery01
RABBITMQ_PID_FILE:/var/lib/rabbitmq/mnesia/[e-mail]
RABBITMQ_PLUGINS_EXPAND_DIR:/var/lib/rabbitmq/mnesia/rabbit@slavery01-plugins-expand
RABBITMQ_ENABLED_PLUGINS_FILE:/etc/rabbitmq/enabled_plugins
RABBITMQ_PLUGINS_DIR:/opt/rabbitmq-server-3.4.2/sbin/../plugins
RABBITMQ_LOGS:/var/log/rabbitmq/[e-mail]
RABBITMQ_SASL_LOGS:/var/log/rabbitmq/[e-mail]
RABBITMQ_CTL_ERL_ARGS:
[root@slavery01 sbin]# 

    说明：

• sbin/rabbitmq-env是对所有环境变量进行默认设置；
• 如果你要修改默认环境变量值，请在文件/etc/rabbitmq/rabbitmq-env.conf进行修改；

 

    2.4 rabbitmqctl

#!/bin/sh -e
##  The contents of this file are subject to the Mozilla Public License
##  Version 1.1 (the "License"); you may not use this file except in
##  compliance with the License. You may obtain a copy of the License
##  at http://www.mozilla.org/MPL/
##
##  Software distributed under the License is distributed on an "AS IS"
##  basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
##  the License for the specific language governing rights and
##  limitations under the License.
##
##  The Original Code is RabbitMQ.
##
##  The Initial Developer of the Original Code is GoPivotal, Inc.
##  Copyright (c) 2007-2014 GoPivotal, Inc.  All rights reserved.
##

# Get default settings with user overrides for (RABBITMQ_)<var_name>
# Non-empty defaults should be set in rabbitmq-env
. `dirname $0`/rabbitmq-env    #调用并执行脚本rabbitmq-env

#epmd是Erlang Port Mapper Daemon的缩写,epmd完成Erlang节点和IP,端口的映射关系,首先要保证epmd处于运行状态，这里先让它运行
# rabbitmqctl starts distribution itself, so we need to make sure epmd
# is running.
${ERL_DIR}erl ${RABBITMQ_NAME_TYPE} rabbitmqctl-prelaunch-$$ -noinput \
-eval 'erlang:halt().' -boot "${CLEAN_BOOT_FILE}"

# We specify Mnesia dir and sasl error logger since some actions
# (e.g. forget_cluster_node --offline) require us to impersonate the
# real node.
RABBITMQ_USE_LONGNAME=${RABBITMQ_USE_LONGNAME} \
exec ${ERL_DIR}erl \
    -pa "${RABBITMQ_HOME}/ebin" \
    -noinput \
    -hidden \
    ${RABBITMQ_CTL_ERL_ARGS} \
    -boot "${CLEAN_BOOT_FILE}" \
    -sasl errlog_type error \
    -mnesia dir "\"${RABBITMQ_MNESIA_DIR}\"" \
    -s rabbit_control_main \
    -nodename $RABBITMQ_NODENAME \
    -extra "$@"

    这里为了打印rabbitmqctl里的变量值，故在rabbitmqctl文件里末尾追加如下脚本，如下：

 

 

echo "ERL_DIR:"${ERL_DIR}
echo "RABBITMQ_NAME_TYPE:"${RABBITMQ_NAME_TYPE}
echo "CLEAN_BOOT_FILE:"${CLEAN_BOOT_FILE}
echo "RABBITMQ_USE_LONGNAME:"${RABBITMQ_USE_LONGNAME}
echo "RABBITMQ_HOME:"${RABBITMQ_HOME}
echo "RABBITMQ_CTL_ERL_ARGS:"${RABBITMQ_CTL_ERL_ARGS}
echo "RABBITMQ_MNESIA_DIR:"${RABBITMQ_MNESIA_DIR}
echo "RABBITMQ_NODENAME:"${RABBITMQ_NODENAME}

    然后执行rabbitmqctl得到的结果如下：

[root@slavery01 sbin]# rabbitmqctl
ERL_DIR:
RABBITMQ_NAME_TYPE:-sname
CLEAN_BOOT_FILE:start_clean
RABBITMQ_USE_LONGNAME:
RABBITMQ_HOME:/opt/rabbitmq-server-3.4.2/sbin/..
RABBITMQ_CTL_ERL_ARGS:
RABBITMQ_MNESIA_DIR:/var/lib/rabbitmq/mnesia/rabbit@slavery01
RABBITMQ_NODENAME:rabbit@slavery01
[root@slavery01 sbin]#

    说明：

• sbin/rabbitmqctl本质是shell脚本里通过erl运行程序/opt//opt/rabbitmq-server-3.4.2/ebin/rabbit_control_main.beam这个erlang程序;
• rabbitmqctl需要erlang语言环境支持，不然无法运行；

 

    2.5 rabbitmq-plugins

#!/bin/sh -e
##  The contents of this file are subject to the Mozilla Public License
##  Version 1.1 (the "License"); you may not use this file except in
##  compliance with the License. You may obtain a copy of the License
##  at http://www.mozilla.org/MPL/
##
##  Software distributed under the License is distributed on an "AS IS"
##  basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
##  the License for the specific language governing rights and
##  limitations under the License.
##
##  The Original Code is RabbitMQ.
##
##  The Initial Developer of the Original Code is GoPivotal, Inc.
##  Copyright (c) 2007-2014 GoPivotal, Inc.  All rights reserved.
##

# Get default settings with user overrides for (RABBITMQ_)<var_name>
# Non-empty defaults should be set in rabbitmq-env
. `dirname $0`/rabbitmq-env    #调用并执行脚本rabbitmq-env

exec ${ERL_DIR}erl \
    -pa "${RABBITMQ_HOME}/ebin" \
    -noinput \
    -hidden \
    ${RABBITMQ_NAME_TYPE} rabbitmq-plugins$$ \
    -boot "${CLEAN_BOOT_FILE}" \
    -s rabbit_plugins_main \
    -enabled_plugins_file "$RABBITMQ_ENABLED_PLUGINS_FILE" \
    -plugins_dist_dir "$RABBITMQ_PLUGINS_DIR" \
    -nodename $RABB

    这里为了打印rabbitmq-plugins里的变量值，故在rabbitmq-plugins文件里末尾追加如下脚本，如下：

echo "ERL_DIR:"${ERL_DIR}
echo "RABBITMQ_HOME:"${RABBITMQ_HOME}
echo "RABBITMQ_NAME_TYPE:"${RABBITMQ_NAME_TYPE}
echo "CLEAN_BOOT_FILE:"${CLEAN_BOOT_FILE}
echo "RABBITMQ_ENABLED_PLUGINS_FILE:"${RABBITMQ_ENABLED_PLUGINS_FILE}
echo "RABBITMQ_PLUGINS_DIR:"${RABBITMQ_PLUGINS_DIR}
echo "RABB:"${RABB}

    然后执行rabbitmq-plugins得到的结果如下：

[root@slavery01 sbin]# rabbitmq-plugins 
ERL_DIR:
RABBITMQ_HOME:/opt/rabbitmq-server-3.4.2/sbin/..
RABBITMQ_NAME_TYPE:-sname
CLEAN_BOOT_FILE:start_clean
RABBITMQ_ENABLED_PLUGINS_FILE:/etc/rabbitmq/enabled_plugins
RABBITMQ_PLUGINS_DIR:/opt/rabbitmq-server-3.4.2/sbin/../plugins
RABB:
[root@slavery01 sbin]#

   说明:

• rabbitmq-plugins本质是shell脚本里通过erl运行/opt/rabbitmq-server-3.4.2/ebin/rabbit_plugins.beam这个erlang程序；
• rabbitmq-plugins需要erlang语言环境支持；
• rabbitmq-plugins主要用于插件管理；

 

    2.6 rabbitmq-server

#!/bin/sh -e
#shell编程是以"#"为注释，但对"#!/bin/sh"却不是。"#!/bin/sh"是对shell的声明，说明你所用的是那种类型的shell及其路径所在。
##  The contents of this file are subject to the Mozilla Public License
##  Version 1.1 (the "License"); you may not use this file except in
##  compliance with the License. You may obtain a copy of the License
##  at http://www.mozilla.org/MPL/
##
##  Software distributed under the License is distributed on an "AS IS"
##  basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
##  the License for the specific language governing rights and
##  limitations under the License.
##
##  The Original Code is RabbitMQ.
##
##  The Initial Developer of the Original Code is GoPivotal, Inc.
##  Copyright (c) 2007-2014 GoPivotal, Inc.  All rights reserved.
##

# Get default settings with user overrides for (RABBITMQ_)<var_name>
# Non-empty defaults should be set in rabbitmq-env
. `dirname $0`/rabbitmq-env    #调用并执行脚本rabbitmq-env

#如果相关参数没有配置，那么表达式"x" = "x$参数KEY"永远成立，则设置相关参数的默认值
RABBITMQ_START_RABBIT=
[ "x" = "x$RABBITMQ_ALLOW_INPUT" ] && RABBITMQ_START_RABBIT=" -noinput"
[ "x" = "x$RABBITMQ_NODE_ONLY" ] && RABBITMQ_START_RABBIT="$RABBITMQ_START_RABBIT -s rabbit boot "

#CYGWIN不会记录进程ID
#后台运行模式时候不会生成进程ID文件
case "$(uname -s)" in
  CYGWIN*) # we make no attempt to record the cygwin pid; rabbitmqctl wait
           # will not be able to make sense of it anyway
           ;;
  *)       # When -detached is passed, we don't write the pid, since it'd be the
           # wrong one
           detached=""
           for opt in "$@"; do
               if [ "$opt" = "-detached" ]; then
                   detached="true"
               fi
           done
           if [ $detached ]; then
               echo "Warning: PID file not written; -detached was passed." 1>&2
           else
               mkdir -p $(dirname ${RABBITMQ_PID_FILE});
               echo $$ > ${RABBITMQ_PID_FILE}
           fi
esac

RABBITMQ_EBIN_ROOT="${RABBITMQ_HOME}/ebin"

#告诉bash如果后续任何语句的执行结果不是true则应该退出
set +e

RABBITMQ_CONFIG_FILE=$RABBITMQ_CONFIG_FILE \
RABBITMQ_DIST_PORT=$RABBITMQ_DIST_PORT \
    ${ERL_DIR}erl -pa "$RABBITMQ_EBIN_ROOT" \
    -boot "${CLEAN_BOOT_FILE}" \
    -noinput \
    -hidden \
    -s rabbit_prelaunch \
    ${RABBITMQ_NAME_TYPE} rabbitmqprelaunch$$ \
    -extra "${RABBITMQ_NODENAME}"

PRELAUNCH_RESULT=$?
if [ ${PRELAUNCH_RESULT} = 2 ] ; then
    # dist port is mentioned in config, so do not set it
    true
elif [ ${PRELAUNCH_RESULT} = 0 ] ; then
    # dist port is not mentioned in the config file, we can set it
    RABBITMQ_DIST_ARG="-kernel inet_dist_listen_min ${RABBITMQ_DIST_PORT} -kernel inet_dist_listen_max ${RABBITMQ_DIST_PORT}"
else
    exit ${PRELAUNCH_RESULT}
fi

set -e

RABBITMQ_CONFIG_ARG=
[ -f "${RABBITMQ_CONFIG_FILE}.config" ] && RABBITMQ_CONFIG_ARG="-config ${RABBITMQ_CONFIG_FILE}"

RABBITMQ_LISTEN_ARG=
[ "x" != "x$RABBITMQ_NODE_PORT" ] && [ "x" != "x$RABBITMQ_NODE_IP_ADDRESS" ] && RABBITMQ_LISTEN_ARG="-rabbit tcp_listeners [{\""${RABBITMQ_NODE_IP_ADDRESS}"\","${RABBITMQ_NODE_PORT}"}]"

# we need to turn off path expansion because some of the vars, notably
# RABBITMQ_SERVER_ERL_ARGS, contain terms that look like globs and
# there is no other way of preventing their expansion.
set -f

RABBITMQ_CONFIG_FILE=$RABBITMQ_CONFIG_FILE \
exec ${ERL_DIR}erl \
    -pa ${RABBITMQ_EBIN_ROOT} \
    ${RABBITMQ_START_RABBIT} \
    ${RABBITMQ_NAME_TYPE} ${RABBITMQ_NODENAME} \
    -boot "${SASL_BOOT_FILE}" \
    ${RABBITMQ_CONFIG_ARG} \
    +W w \
    ${RABBITMQ_SERVER_ERL_ARGS} \
    ${RABBITMQ_SERVER_ADDITIONAL_ERL_ARGS} \
    ${RABBITMQ_LISTEN_ARG} \
    -sasl errlog_type error \
    -sasl sasl_error_logger false \
    -rabbit error_logger '{file,"'${RABBITMQ_LOGS}'"}' \
    -rabbit sasl_error_logger '{file,"'${RABBITMQ_SASL_LOGS}'"}' \
    -rabbit enabled_plugins_file "\"$RABBITMQ_ENABLED_PLUGINS_FILE\"" \
    -rabbit plugins_dir "\"$RABBITMQ_PLUGINS_DIR\"" \
    -rabbit plugins_expand_dir "\"$RABBITMQ_PLUGINS_EXPAND_DIR\"" \
    -os_mon start_cpu_sup false \
    -os_mon start_disksup false \
    -os_mon start_memsup false \
    -mnesia dir "\"${RABBITMQ_MNESIA_DIR}\"" \
    ${RABBITMQ_SERVER_START_ARGS} \
    ${RABBITMQ_DIST_ARG} \
    "$@"

    这里为了打印rabbitmq-server里的变量值，故在rabbitmq-server文件里末尾追加如下脚本，如下：

 

 

echo "RABBITMQ_START_RABBIT:"${RABBITMQ_START_RABBIT}
echo "RABBITMQ_ALLOW_INPUT:"${RABBITMQ_ALLOW_INPUT}
echo "RABBITMQ_NODE_ONLY:"${RABBITMQ_NODE_ONLY}
echo "RABBITMQ_PID_FILE:"${RABBITMQ_PID_FILE}
echo "RABBITMQ_HOME:"${RABBITMQ_HOME}
echo "RABBITMQ_EBIN_ROOT:"${RABBITMQ_EBIN_ROOT}
echo "RABBITMQ_CONFIG_FILE:"${RABBITMQ_CONFIG_FILE}
echo "ERL_DIR:"${ERL_DIR}
echo "CLEAN_BOOT_FILE:"${CLEAN_BOOT_FILE}
echo "RABBITMQ_NAME_TYPE:"${RABBITMQ_NAME_TYPE}
echo "RABBITMQ_NODENAME:"${RABBITMQ_NODENAME}
echo "PRELAUNCH_RESULT:"${PRELAUNCH_RESULT}
echo "RABBITMQ_DIST_ARG:"${RABBITMQ_DIST_ARG}
echo "RABBITMQ_DIST_PORT:"${RABBITMQ_DIST_PORT}
echo "RABBITMQ_CONFIG_ARG:"${RABBITMQ_CONFIG_ARG}
echo "RABBITMQ_NODE_PORT:"${RABBITMQ_NODE_PORT}
echo "RABBITMQ_NODE_IP_ADDRESS:"${RABBITMQ_NODE_IP_ADDRESS}
echo "SASL_BOOT_FILE:"${SASL_BOOT_FILE}
echo "RABBITMQ_SERVER_ERL_ARGS:"${RABBITMQ_SERVER_ERL_ARGS}
echo "RABBITMQ_SERVER_ADDITIONAL_ERL_ARGS:"${RABBITMQ_SERVER_ADDITIONAL_ERL_ARGS}
echo "RABBITMQ_LISTEN_ARG:"${RABBITMQ_LISTEN_ARG}
echo "RABBITMQ_LOGS:"${RABBITMQ_LOGS}
echo "RABBITMQ_SASL_LOGS:"${RABBITMQ_SASL_LOGS}
echo "RABBITMQ_ENABLED_PLUGINS_FILE:"${RABBITMQ_ENABLED_PLUGINS_FILE}
echo "RABBITMQ_PLUGINS_DIR:"${RABBITMQ_PLUGINS_DIR}
echo "RABBITMQ_PLUGINS_EXPAND_DIR:"${RABBITMQ_PLUGINS_EXPAND_DIR}
echo "RABBITMQ_MNESIA_DIR:"${RABBITMQ_MNESIA_DIR}
echo "RABBITMQ_SERVER_START_ARGS:"${RABBITMQ_SERVER_START_ARGS}
echo "RABBITMQ_DIST_ARG:"${RABBITMQ_DIST_ARG}

    然后执行rabbitmq-server得到的结果如下：

[root@slavery01 sbin]# rabbitmq-server
RABBITMQ_START_RABBIT: -noinput -s rabbit boot
RABBITMQ_ALLOW_INPUT:
RABBITMQ_NODE_ONLY:
RABBITMQ_PID_FILE:/var/lib/rabbitmq/mnesia/[e-mail]
RABBITMQ_HOME:/opt/rabbitmq-server-3.4.2/sbin/..
RABBITMQ_EBIN_ROOT:/opt/rabbitmq-server-3.4.2/sbin/../ebin
RABBITMQ_CONFIG_FILE:/etc/rabbitmq/rabbitmq
ERL_DIR:
CLEAN_BOOT_FILE:start_clean
RABBITMQ_NAME_TYPE:-sname
RABBITMQ_NODENAME:rabbit@slavery01
PRELAUNCH_RESULT:0
RABBITMQ_DIST_ARG:-kernel inet_dist_listen_min 25672 -kernel inet_dist_listen_max 25672
RABBITMQ_DIST_PORT:25672
RABBITMQ_CONFIG_ARG:
RABBITMQ_NODE_PORT:
RABBITMQ_NODE_IP_ADDRESS:
SASL_BOOT_FILE:start_sasl
RABBITMQ_SERVER_ERL_ARGS:+K true +A30 +P 1048576 -kernel inet_default_connect_options [{nodelay,true}]
RABBITMQ_SERVER_ADDITIONAL_ERL_ARGS:
RABBITMQ_LISTEN_ARG:
RABBITMQ_LOGS:/var/log/rabbitmq/[e-mail]
RABBITMQ_SASL_LOGS:/var/log/rabbitmq/[e-mail]
RABBITMQ_ENABLED_PLUGINS_FILE:/etc/rabbitmq/enabled_plugins
RABBITMQ_PLUGINS_DIR:/opt/rabbitmq-server-3.4.2/sbin/../plugins
RABBITMQ_PLUGINS_EXPAND_DIR:/var/lib/rabbitmq/mnesia/rabbit@slavery01-plugins-expand
RABBITMQ_MNESIA_DIR:/var/lib/rabbitmq/mnesia/rabbit@slavery01
RABBITMQ_SERVER_START_ARGS:
RABBITMQ_DIST_ARG:-kernel inet_dist_listen_min 25672 -kernel inet_dist_listen_max 25672
[root@slavery01 sbin]# rabbitmq-server

    说明：

• rabbitmq-server本质是shell通过erl运行/opt/rabbitmq-server-3.4.2/ebin/rrabbit.beam这个erlang程序；
• rabbitmq-server需要erlang语言环境支持；

 

3.rabbitmq3.4.2的默认配置文件在哪里？默认插件放在哪里？日志放在哪里？

默认配置项	默认配置项值
默认配置文件目录	/etc/rabbitmq/rabbitmq
默认日志文件目录	/var/log/rabbitmq
默认数据库目录	/var/lib/rabbitmq/mnesia
默认激活插件的目录	/etc/rabbitmq/enabled_plugins
默认插件所在目录	/opt/rabbitmq-3.4.2/plugins
默认rabbitmq相关环境配置文件	/etc/rabbitmq/rabbitmq-env.conf

 

4.为什么有了 rabbitmqctl 还需要 RabbitMQ Management plugin?

•     原因一：rabbitmqctl需要有Erlang运行环境支持，必须和rabbitmq集群使用相同的.erlang.cookie;
•     原因二：就算有了一种的条件，那么拿到这个权限就可以操作一切，比较危险；
•     原因三：不是所有人都喜欢使用rabbitmqctl这种CLI命令，不如界面点击灵活可视化效果好；
•     原因四：rabbitmqctl难于与其他编程语言集成。

 

5.RabbitMQ Management plugin 提供了哪些功能?

    Web interface        通过鼠标点击就可以查看各种信息,WEB UI提供了在 rabbitmq server 上的可视化操作;

    REST interface      通过HTTP URI实现对各种功能的访问.REST API 提供了一种与其他语言和工具集成的方式.返回的结构均以JSON格式提供,故需要支持JSON解析,需要支持HTTP basic authentication,需要手动构造完整的 HTTP request.支持对返回结果的排序,显示过滤,以及获取历史数据;

    CLI interface          rabbitmqadmin 脚本访问 (Python2.x).CLI interface 优于 REST-based API 的地方是不需要构建 request 中的全部内容，提供了优雅的格式化的输出。rabbitmqadmin 已经实现了对 REST API 的封装，提供了更加简洁的调用接口，能够对 rabbitmq server 进行管理和监控。rabbitmqadmin 提供了 Web UI 上所具有的全部功能，且更易于在脚本中使用。rabbitmqadmin 是一个特化的 HTTP 客户端，但如果你打算在自己的应用程序中调用 rabbitmqadmin ，那么还是建议你采用直接访问 HTTP API 的方式.另外rabbitmqadmin一般会在增加可执行权限后放到/opt/rabbitmq-3.4.2/sbin中.