【原创】管理 RabbitMQ 服务器的几种方式

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[root@Betty chapter-9]# vi /usr/sbin/rabbitmqctl

#!/bin/sh

##  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 VMware, Inc.

##  Copyright (c) 2007-2013 VMware, 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     # $0 为 /usr/sbin/rabbitmqctl 所以 `dirname $0`/rabbitmq-env

                                # 为 /usr/sbin/rabbitmq-env

                                # 这里是初始化了一些默认的环境变量值（详见下面）

##--- Set environment vars RABBITMQ_<var_name> to defaults if not set

# 若未手动设置 $RABBITMQ_NODENAME 则设置其为默认值 ${NODENAME}

[ "x" = "x$RABBITMQ_NODENAME" ] && RABBITMQ_NODENAME=${NODENAME}

# 若未手动设置 $RABBITMQ_CTL_ERL_ARGS 则设置其值为默认值 ${CTL_ERL_ARGS}

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

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

exec ${ERL_DIR}erl \

    -pa "${RABBITMQ_HOME}/ebin" \

    -noinput \

    -hidden \

    ${RABBITMQ_CTL_ERL_ARGS} \

    -sname rabbitmqctl$$ \                  # $$ 为当前进程的 pid

    -boot "${CLEAN_BOOT_FILE}" \

    -s rabbit_control_main \

    -nodename $RABBITMQ_NODENAME \

    -extra "$@"

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[root@Betty ~]# vi /usr/sbin/rabbitmq-env

#!/bin/sh

##  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 VMware, Inc.

##  Copyright (c) 2007-2013 VMware, Inc.  All rights reserved.

##

# 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"    # $0 的值应该为 /usr/sbin/rabbitmq-env

while [ -h "$SCRIPT_PATH" ] ; do       # -h 用于判定是否为符号链接

    # readlink -f 获取符号链接 rabbitmq-env 所对应的完整路径 /usr/lib/rabbitmq/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

    # 直接执行 readlink 将获取符号链接 rabbitmq-env 所对应的相对路径 ../lib/rabbitmq/sbin/rabbitmq-env

      REL_PATH=`readlink $SCRIPT_PATH`

      # expr STRING : REGEXP 判定 $REL_PATH 是不是以 '/' 开头

      if expr "$REL_PATH" : '/.*' > /dev/null; then

        SCRIPT_PATH="$REL_PATH"   # 以 '/' 开头

      else

        SCRIPT_PATH="`dirname "$SCRIPT_PATH"`/$REL_PATH"

      fi

    else

      SCRIPT_PATH=$FULL_PATH

    fi

done

SCRIPT_DIR=`dirname $SCRIPT_PATH`    # 得到 SCRIPT_DIR = /usr/lib/rabbitmq/sbin

RABBITMQ_HOME="${SCRIPT_DIR}/.."     # 得到 RABBITMQ_HOME = /usr/lib/rabbitmq/

[ "x" = "x$HOSTNAME" ] && HOSTNAME=`env hostname`  # 得到 HOSTNAME = Betty

NODENAME=rabbit@${HOSTNAME%%.*}      # 得到 NODENAME = rabbit@Betty 其中 ${HOSTNAME%%.*} 的含义是

                                     # 以 '.' 为分隔位置，从后开始作最长匹配的删除

                                     # 如果是一个 '%' 则为最短匹配

## Set defaults

. ${SCRIPT_DIR}/rabbitmq-defaults    # 初始化默认环境变量（详见下面）

## Common defaults

SERVER_ERL_ARGS="+K true +A30 +P 1048576 \

  -kernel inet_default_connect_options [{nodelay,true}]"    # 默认的通用配置选项

# 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 -n 不输出换行符

    echo "location has moved to ${CONF_ENV_FILE}"

fi

## Get configuration variables from the configure environment file

[ -f ${CONF_ENV_FILE} ] && . ${CONF_ENV_FILE} # 如果存在 ${CONF_ENV_FILE} 文件则执行该 环境配置 文件

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[root@Betty ~]# vi /usr/sbin/rabbitmq-defaults

#!/bin/sh

##  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 VMware, Inc.

##  Copyright (c) 2012-2013 VMware, 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

CONFIG_FILE=${SYS_PREFIX}/etc/rabbitmq/rabbitmq                 # 配置文件路径

LOG_BASE=${SYS_PREFIX}/var/log/rabbitmq                         # 日志文件路径

MNESIA_BASE=${SYS_PREFIX}/var/lib/rabbitmq/mnesia               # 数据库路径

ENABLED_PLUGINS_FILE=${SYS_PREFIX}/etc/rabbitmq/enabled_plugins # 记录已使能插件的文件

PLUGINS_DIR="${RABBITMQ_HOME}/plugins"                          # 插件所在路径

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