【Linux-Centos7】安装 RabbitMQ

1.环境

Centos7 64 系统 Linux

1.1.安装文件版本

• wxWidgets-3.2.1.tar.bz2
• otp_src_25.2.tar.gz
• rabbitmq-server-generic-unix-3.11.5.tar.xz

2.安装部署

2.1.编译安装

2.1.1.下载

• 下载rabbitmq-server-generic-unix-3.11.5.tar.xz
  • 或者查看github
• 选择版本Erlang(https://rabbitmq.com/which-erlang.html)
• 下载Erlang源码 25.2
  • 下载wxwidgets

将下载的包放到/opt/rabbitmq-server中

2.1.2.安装 wxwidgets

编译安装Erlang的前提，需要编译安装wxwidgets

# [下载wxwidgets](http://www.wxwidgets.org/downloads/)
# 解压
bzip2 -dkv wxWidgets-3.2.1.tar.bz2
tar -xvf wxWidgets-3.2.1.tar
# unzip wxWidgets-3.2.1.zip # 或者
yum -y install make gcc gcc-c++ kernel-devel m4 ncurses-devel openssl-devel unixODBC unixODBC-devel java-devel
# Erlang: No OpenGL headers found, wx will NOT be usable
yum install mesa* --skip-broken
yum install freeglut*
# 需要安装GTK+: yum install *gtk*或 yum install *gtk* --skip-broken
yum install *gtk*

# 配置
cd /opt/rabbitmq-server/wxWidgets-3.2.1
./configure --with-gtk=3 --with-opengl --enable-debug --enable-unicode
# 编译&安装（时间有点长）
make && make install
# install path: /usr/local/include/wx-3.2

# 测试
wx-config

2.1.3.安装 Erlang

# 解压
tar -zxvf otp_src_25.2.tar.gz
cd /opt/rabbitmq-server/otp_src_25.2
# 配置
./configure --prefix=/usr/local/erlang
# 出现如下信息，即说明配置成功
#*********************************************************************
#**********************  APPLICATIONS INFORMATION  *******************
#*********************************************************************
#
#erts           : 
#                 JIT disabled due to lack of compiler with C++17 support
#
#*********************************************************************
#*********************************************************************
#**********************  DOCUMENTATION INFORMATION  ******************
#*********************************************************************
#
#documentation  : 
#                 fop is missing.
#                 Using fakefop to generate placeholder PDF files.

# 编译&安装
make -j && make install
# install path: /usr/local/erlang/bin

2.1.4.安装 rabbitmq-server

安装位置: /usr/local/rabbitmq
日志位置: /usr/local/rabbitmq/var/log

yum install libtool libtool-ltdl-devel libevent-devel lua  ncurses-devel openssl-devel flex

xz -d rabbitmq-server-generic-unix-3.11.5.tar.xz
tar xf rabbitmq-server-generic-unix-3.11.5.tar
mv rabbitmq_server-3.11.5 /usr/local/rabbitmq

# 配置环境变量
vim /etc/profile
PATH=$PATH:/usr/local/erlang/bin
PATH=$PATH:/usr/local/rabbitmq/sbin
source /etc/profile

遇到的问题（参考）

---

1) PROBLEM：rabbitmq no such file or directory “crypto.app”

下载 https://github.com/openssl/openssl/tags 选择 OpenSSL_1_1_1q
将下载的 openssl-OpenSSL_1_1_1j.tar.gz

tar -xzvf openssl-OpenSSL_1_1_1j.tar.gz
cd /opt/rabbitmq-server/openssl-OpenSSL_1_1_1j
# 配置
./config shared
# 编译安装
make && make install
# ----------------------- Erlang Rebuild -----------------------
cd /opt/rabbitmq-server/otp_src_25.2
make clean
# 配置
./configure --prefix=/usr/local/erlang
# 编译安装
make -j && make install
# 测试
elr
> crypto:start()

2) PROBLEM：warning: the VM is running with native name encoding of latin1 which may cause Elixir to malfunction as it expects utf8. Please ensure your locale is set to UTF-8 (which can be verified by running “locale” in your shell)

vim /etc/profile
# 末尾添加
export LC_ALL=en_US.UTF-8
source /etc/profile

3) PROBLEM：Error: unable to perform an operation on node ‘rabbit@HOST-NAME’. Please see diagnostics information and suggestions below.

vim /etc/hosts
# IP 本机名称
xxx.xxx.xxx.xxx HOST-NAME

---

2.1.5.启动RabbitMQ服务

# 前台启动
rabbitmq-server
# 后台启动
rabbitmq-server -detached
# 查看服务状态
rabbitmqctl status

2.1.6.关闭RabbitMQ服务

rabbitmqctl stop

2.1.7.启动管理端(添加用户)插件

# 开启web管理界面
rabbitmq-plugins enable rabbitmq_management
# 检查所有插件的启用和禁用状态
# rabbitmq-plugins list
rabbitmqctl add_user admin '123456'
rabbitmqctl set_user_tags admin administrator
rabbitmqctl set_permissions -p / admin '.*' '.*' '.*'
# 重启
rabbitmqctl stop
rabbitmq-server -detached

2.1.8.开放服务器端口

firewall-cmd --zone=public --add-port=15672/tcp --permanent
firewall-cmd --zone=public --add-port=5672/tcp --permanent
firewall-cmd --reload

2.1.9.测试

curl http://127.0.0.1:15672
curl http://IP:15672

2.1.10.设置开机启动

• 将 /usr/local/rabbitmq/sbin/rabbitmq-server、/usr/local/rabbitmq/sbin/rabbitmq-env 备份
• 将rabbitmq-server、rabbitmq-env拷贝到对应的服务器上
  • 或者修改原先脚本，在脚本头加入 ERLANG_HOME=/usr/local/erlang/bin；将erl修改成$ERLANG_HOME/erl
• 进入目录 cd /usr/lib/systemd/system
• 将文件拷贝到对应的服务器上
• 重新加载服务 systemctl daemon-reload
• 设置为开机启动 systemctl enable rabbitmq.service
• 查看是否已开机启动 systemctl is-enabled rabbitmq.service
• 查看服务状态 systemctl status rabbitmq.service
• 启用服务 systemctl enable rabbitmq.service
• 启动服务 systemctl start rabbitmq.service
• 停止服务 systemctl stop rabbitmq.service

附录

A.参考

• install-generic-unix
• rabbitmq config
• RabbitMQ超详细安装教程（Linux）
• 参考
• 填坑参考
• 填坑参考
• 填坑 unable to perform an operation
• 填坑 the VM is running with native name encoding of latin1 which may
• 依赖 openssl

B.参考配置文件

b1.rabbitmq.service

#
# /usr/lib/systemd/system
# systemd service file for RabbitMQ Server forking server
#
[Unit]
Description=Rabbitmq Server
Documentation=Rabbitmq Server 3.11.5 Rabbitmq Server Generic Unix 3.11.5
Documentation=https://github.com/rabbitmq/rabbitmq-server
Documentation=https://github.com/rabbitmq/rabbitmq-server/releases
Documentation=https://rabbitmq.com/install-generic-unix.html
Documentation=https://rabbitmq.com/which-erlang.html

After=network.target

[Service]
Type=forking
User=root
# Group=root
WorkingDirectory=/usr/local/rabbitmq
ExecStart=/usr/local/rabbitmq/sbin/rabbitmq-server -detached
ExecReload=/usr/local/rabbitmq/sbin/rabbitmqctl stop
ExecStop=/usr/local/rabbitmq/sbin/rabbitmqctl stop
PrivateTmp=true

[Install]
WantedBy=multi-user.target

b2.hosts

xxx.xxx.xxx.xxx springcloud

b3.hostsrabbitmq-env

#!/bin/sh -e
##  This Source Code Form is subject to the terms of the Mozilla Public
##  License, v. 2.0. If a copy of the MPL was not distributed with this
##  file, You can obtain one at https://mozilla.org/MPL/2.0/.
##
##  Copyright (c) 2007-2020 VMware, Inc. or its affiliates.  All rights reserved.
##
ERLANG_HOME=/usr/local/erlang/bin
if [ "$RABBITMQ_ENV_LOADED" = 1 ]; then
    return 0;
fi

if [ -z "$RABBITMQ_SCRIPTS_DIR" ]; then
    # 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="$0"
    while [ -h "$SCRIPT_PATH" ] ; do
        # Determine if readlink -f is supported at all. TODO clean this up.
        FULL_PATH=`readlink -f $SCRIPT_PATH 2>/dev/null`
        if [ "$?" != "0" ]; then
          REL_PATH=`readlink $SCRIPT_PATH`
          if expr "$REL_PATH" : '/.*' > /dev/null; then
            SCRIPT_PATH="$REL_PATH"
          else
            SCRIPT_PATH="`dirname "$SCRIPT_PATH"`/$REL_PATH"
          fi
        else
          SCRIPT_PATH=$FULL_PATH
        fi
    done
    set -e

    RABBITMQ_SCRIPTS_DIR=`dirname $SCRIPT_PATH`
fi

_rmq_env_now()
{
    date '+%Y-%m-%d %H:%M:%S'
}

_rmq_env_print()
{
    _rmq_env_tmp="$1"
    _rmq_env_tmp_len="${#_rmq_env_tmp}"
    shift
    printf '%s %s %s\n' "$(_rmq_env_now)" "$_rmq_env_tmp" "$1" 1>&2
    shift
    _rmq_env_print_line=''
    _rmq_env_indent="$((_rmq_env_tmp_len + 21))"
    for _rmq_env_print_line in "$@"
    do
        printf "%${_rmq_env_indent}s%s\n" ' ' "$_rmq_env_print_line" 1>&2
    done
    unset _rmq_env_print_line
    unset _rmq_env_indent
    unset _rmq_env_tmp_len
    unset _rmq_env_tmp
}

_rmq_env_perr()
{
    _rmq_env_print '[error]' "$@"
}

_rmq_env_pwarn()
{
    _rmq_env_print '[warning]' "$@"
}

rmq_realpath() {
    local path=$1

    if [ -d "$path" ]; then
        cd "$path" && pwd
    elif [ -f "$path" ]; then
        cd "$(dirname "$path")" && echo $(pwd)/$(basename "$path")
    else
        echo "$path"
    fi
}

RABBITMQ_HOME="$(rmq_realpath "${RABBITMQ_SCRIPTS_DIR}/..")"
ESCRIPT_DIR="${RABBITMQ_HOME}/escript"

## Set defaults
. ${RABBITMQ_SCRIPTS_DIR}/rabbitmq-defaults

# We save the current value of $RABBITMQ_PID_FILE in case it was set by
# an init script. If $CONF_ENV_FILE overrides it again, we must ignore
# it and warn the user.
saved_RABBITMQ_PID_FILE="$RABBITMQ_PID_FILE"

## Get configuration variables from the configure environment file
[ "x" = "x$RABBITMQ_CONF_ENV_FILE" ] && RABBITMQ_CONF_ENV_FILE="$CONF_ENV_FILE"
if [ -f "$RABBITMQ_CONF_ENV_FILE" ]; then
    CONF_ENV_FILE_PHASE=rabbitmq-env
    . "$RABBITMQ_CONF_ENV_FILE" || true
fi

# Bump ETS table limit to 50000
if [ -z "$ERL_MAX_ETS_TABLES" ]; then
    export ERL_MAX_ETS_TABLES=50000
fi

# Default is defined here:
# https://github.com/erlang/otp/blob/master/erts/emulator/beam/erl_port.h
if [ -z "$ERL_MAX_PORTS" ]; then
    export ERL_MAX_PORTS=65536
fi

[ -n "$ERL_EPMD_PORT" ] && export ERL_EPMD_PORT
[ -n "$ERL_EPMD_ADDRESS" ] && export ERL_EPMD_ADDRESS

DEFAULT_SCHEDULER_BIND_TYPE="db"
[ -n "$SCHEDULER_BIND_TYPE" ] || SCHEDULER_BIND_TYPE="$DEFAULT_SCHEDULER_BIND_TYPE"
[ -n "$RABBITMQ_SCHEDULER_BIND_TYPE" ] || RABBITMQ_SCHEDULER_BIND_TYPE="$SCHEDULER_BIND_TYPE"

DEFAULT_DISTRIBUTION_BUFFER_SIZE=128000
[ -n "$DISTRIBUTION_BUFFER_SIZE" ] || DISTRIBUTION_BUFFER_SIZE="$DEFAULT_DISTRIBUTION_BUFFER_SIZE"
[ -n "$RABBITMQ_DISTRIBUTION_BUFFER_SIZE" ] || RABBITMQ_DISTRIBUTION_BUFFER_SIZE="$DISTRIBUTION_BUFFER_SIZE"

DEFAULT_MAX_NUMBER_OF_PROCESSES=1048576
[ -n "$MAX_NUMBER_OF_PROCESSES" ] || MAX_NUMBER_OF_PROCESSES="$DEFAULT_MAX_NUMBER_OF_PROCESSES"
[ -n "$RABBITMQ_MAX_NUMBER_OF_PROCESSES" ] || RABBITMQ_MAX_NUMBER_OF_PROCESSES="$MAX_NUMBER_OF_PROCESSES"

DEFAULT_MAX_NUMBER_OF_ATOMS=5000000
[ -n "$MAX_NUMBER_OF_ATOMS" ] || MAX_NUMBER_OF_ATOMS="$DEFAULT_MAX_NUMBER_OF_ATOMS"
[ -n "$RABBITMQ_MAX_NUMBER_OF_ATOMS" ] || RABBITMQ_MAX_NUMBER_OF_ATOMS="$MAX_NUMBER_OF_ATOMS"

DEFAULT_SCHEDULER_BUSY_WAIT_THRESHOLD=none
[ -n "$SCHEDULER_BUSY_WAIT_THRESHOLD" ] || SCHEDULER_BUSY_WAIT_THRESHOLD="$DEFAULT_SCHEDULER_BUSY_WAIT_THRESHOLD"
[ -n "$RABBITMQ_SCHEDULER_BUSY_WAIT_THRESHOLD" ] || RABBITMQ_SCHEDULER_BUSY_WAIT_THRESHOLD="$SCHEDULER_BUSY_WAIT_THRESHOLD"

## Common server defaults
SERVER_ERL_ARGS=" +P $RABBITMQ_MAX_NUMBER_OF_PROCESSES +t $RABBITMQ_MAX_NUMBER_OF_ATOMS +stbt $RABBITMQ_SCHEDULER_BIND_TYPE +zdbbl $RABBITMQ_DISTRIBUTION_BUFFER_SIZE +sbwt $RABBITMQ_SCHEDULER_BUSY_WAIT_THRESHOLD +sbwtdcpu $RABBITMQ_SCHEDULER_BUSY_WAIT_THRESHOLD +sbwtdio $RABBITMQ_SCHEDULER_BUSY_WAIT_THRESHOLD "

##--- Set environment vars RABBITMQ_ to defaults if not set

[ "x" = "x$RABBITMQ_CTL_ERL_ARGS" ] && RABBITMQ_CTL_ERL_ARGS="$CTL_ERL_ARGS"
[ "x" = "x$RABBITMQ_CTL_DIST_PORT_MIN" ] && RABBITMQ_CTL_DIST_PORT_MIN="$CTL_DIST_PORT_MIN"
[ "x" = "x$RABBITMQ_CTL_DIST_PORT_MAX" ] && RABBITMQ_CTL_DIST_PORT_MAX="$CTL_DIST_PORT_MAX"
[ "x" = "x$RABBITMQ_CTL_DIST_PORT_MIN" ] && RABBITMQ_CTL_DIST_PORT_MIN='35672'
[ "x" = "x$RABBITMQ_CTL_DIST_PORT_MAX" ] && RABBITMQ_CTL_DIST_PORT_MAX="$(($RABBITMQ_CTL_DIST_PORT_MIN + 10))"

[ "x" = "x$RABBITMQ_SERVER_ERL_ARGS" ] && RABBITMQ_SERVER_ERL_ARGS=${SERVER_ERL_ARGS}
[ "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$RABBITMQ_SERVER_CODE_PATH" ] && RABBITMQ_SERVER_CODE_PATH=${SERVER_CODE_PATH}
[ "x" = "x$RABBITMQ_IGNORE_SIGINT" ] && RABBITMQ_IGNORE_SIGINT="true"
[ "xtrue" = "x$RABBITMQ_IGNORE_SIGINT" ] && RABBITMQ_IGNORE_SIGINT_FLAG="+B i"

if [ -n "$saved_RABBITMQ_PID_FILE" ] && \
    [ "$saved_RABBITMQ_PID_FILE" != "$RABBITMQ_PID_FILE" ]
then
    _rmq_env_pwarn 'RABBITMQ_PID_FILE was already set by the init script to:' \
        "$saved_RABBITMQ_PID_FILE" \
        'The value set in rabbitmq-env.conf is ignored because it would break the init script.'

    RABBITMQ_PID_FILE="$saved_RABBITMQ_PID_FILE"
fi

[ "x" = "x$RABBITMQ_BOOT_MODULE" ] && RABBITMQ_BOOT_MODULE=${BOOT_MODULE}

##--- End of overridden  variables

_rmq_env_set_erl_libs()
{
    if [ -n "$ERL_LIBS" ]
    then
        export ERL_LIBS="$RABBITMQ_HOME/plugins:$ERL_LIBS"
    else
        export ERL_LIBS="$RABBITMQ_HOME/plugins"
    fi
}

run_escript()
{
    escript_main="${1:?escript_main must be defined}"
    shift
    escript="${1:?escript must be defined}"
    shift

    _rmq_env_set_erl_libs

    # Important: do not quote RABBITMQ_CTL_ERL_ARGS as they must be
    # word-split
    # shellcheck disable=SC2086
    exec $ERLANG_HOME/erl +B \
        -boot "$CLEAN_BOOT_FILE" \
        -noinput -noshell -hidden -smp enable \
        $RABBITMQ_CTL_ERL_ARGS \
        -kernel inet_dist_listen_min "$RABBITMQ_CTL_DIST_PORT_MIN" \
        -kernel inet_dist_listen_max "$RABBITMQ_CTL_DIST_PORT_MAX" \
        -run escript start \
        -escript main "$escript_main" \
        -extra "$escript" "$@"
}

RABBITMQ_ENV_LOADED=1

# Since we source this elsewhere, don't accidentally stop execution
true

b4.rabbitmq-server

#!/bin/sh
# vim:sw=4:et:
##  This Source Code Form is subject to the terms of the Mozilla Public
##  License, v. 2.0. If a copy of the MPL was not distributed with this
##  file, You can obtain one at https://mozilla.org/MPL/2.0/.
##
##  Copyright (c) 2007-2020 VMware, Inc. or its affiliates.  All rights reserved.
##
ERLANG_HOME=/usr/local/erlang/bin
set -e

# Get default settings with user overrides for (RABBITMQ_)
# Non-empty defaults should be set in rabbitmq-env
SCRIPTS_DIR=$(dirname "$0")
. "$SCRIPTS_DIR/rabbitmq-env"

[ "$NOTIFY_SOCKET" ] && RUNNING_UNDER_SYSTEMD=true

RABBITMQ_DEFAULT_ALLOC_ARGS="+MBas ageffcbf +MHas ageffcbf +MBlmbcs 512 +MHlmbcs 512 +MMmcs 30"

check_start_params() {
    check_not_empty RABBITMQ_BOOT_MODULE
    check_not_empty SASL_BOOT_FILE
}

check_not_empty() {
    local name="${1:?}"
    local value
    eval value=\$$name
    if [ -z "$value" ]; then
        echo "Error: ENV variable should be defined: $1.
       Please check rabbitmq-env, rabbitmq-defaults, and ${RABBITMQ_CONF_ENV_FILE} script files"
        exit 78
    fi
}

start_rabbitmq_server() {
    set -e

    _rmq_env_set_erl_libs

    RABBITMQ_START_RABBIT=
    [ "x" = "x$RABBITMQ_ALLOW_INPUT" ] && RABBITMQ_START_RABBIT=" -noinput"
    if test -z "$RABBITMQ_NODE_ONLY"; then
        if test "$USE_RABBIT_BOOT_SCRIPT"; then
            # TODO: This is experimental and undocumented at this point.
            # It is here just to do simple checks while playing with how
            # RabbitMQ is started.
            "$SCRIPTS_DIR/rabbitmq-rel" gen-boot
            SASL_BOOT_FILE=rabbit
            test -f "$SASL_BOOT_FILE.boot"
            RABBITMQ_START_RABBIT="$RABBITMQ_START_RABBIT -init_debug"
        else
            RABBITMQ_START_RABBIT="$RABBITMQ_START_RABBIT -s $RABBITMQ_BOOT_MODULE boot"
        fi
    fi

    # 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

    export ERL_MAX_ETS_TABLES \
        SYS_PREFIX

    check_start_params

    exec $ERLANG_HOME/erl \
        -pa "$RABBITMQ_SERVER_CODE_PATH" \
        ${RABBITMQ_START_RABBIT} \
        -boot "${SASL_BOOT_FILE}" \
        +W w \
        ${RABBITMQ_DEFAULT_ALLOC_ARGS} \
        ${RABBITMQ_SERVER_ERL_ARGS} \
        ${RABBITMQ_SERVER_ADDITIONAL_ERL_ARGS} \
        ${RABBITMQ_SERVER_START_ARGS} \
        -syslog logger '[]' \
        -syslog syslog_error_logger false \
        -kernel prevent_overlapping_partitions false \
        "$@"
}

stop_rabbitmq_server() {
    if test "$rabbitmq_server_pid"; then
        kill -TERM "$rabbitmq_server_pid"
        wait "$rabbitmq_server_pid" || true
    fi
}

if [ "$RABBITMQ_ALLOW_INPUT" -o "$RUNNING_UNDER_SYSTEMD" -o "$detached" ]; then
    # Run erlang VM directly, completely replacing current shell
    # process - so the pid file written in the code above will be
    # valid (unless detached, which is also handled in the code
    # above).
    #
    # And also this is the correct mode to run the broker under
    # systemd - there is no need in a proxy process that converts
    # signals to graceful shutdown command, the unit file should already
    # contain instructions for graceful shutdown. Also by removing
    # this additional process we could simply use value returned by
    # `os:getpid/0` for a systemd ready notification.
    start_rabbitmq_server "$@"
else
    # When RabbitMQ runs in the foreground but the Erlang shell is
    # disabled, we setup signal handlers to stop RabbitMQ properly. This
    # is at least useful in the case of Docker.
    # The Erlang VM should ignore SIGINT.
    RABBITMQ_SERVER_START_ARGS="${RABBITMQ_SERVER_START_ARGS} ${RABBITMQ_IGNORE_SIGINT_FLAG}"

    # Signal handlers. They all stop RabbitMQ properly, using
    # rabbitmqctl stop. This script will exit with different exit codes:
    #   SIGHUP, SIGTSTP + SIGCONT
    #     Ignored until we implement a useful behavior.
    #   SIGTERM
    #	  Exits 0 since this is considered a normal process termination.
    #   SIGINT
    #     Exits 128 + $signal_number where $signal_number is 2 for SIGINT (see
    #     https://pubs.opengroup.org/onlinepubs/009695399/utilities/kill.html).
    #     This is considered an abnormal process termination. Normally, we
    #     don't need to specify this exit code because the shell propagates it.
    #     Unfortunately, the signal handler doesn't work as expected in Dash,
    #     thus we need to explicitly restate the exit code.
    #
    # The behaviors below should remain consistent with the
    # equivalent signal handlers in the Erlang code
    # (see apps/rabbitmq_prelaunch/src/rabbit_prelaunch_sighandler.erl).
    trap '' HUP TSTP CONT
    trap "stop_rabbitmq_server; exit 0" TERM
    trap "stop_rabbitmq_server; exit 130" INT

    start_rabbitmq_server "$@" &
    export rabbitmq_server_pid=$!

    # Block until RabbitMQ exits or a signal is caught.
    # Waits for last command (which is start_rabbitmq_server)
    #
    # The "|| true" is here to work around an issue with Dash. Normally
    # in a Bourne shell, if `wait` is interrupted by a signal, the
    # signal handlers defined above are executed and the script
    # terminates with the exit code of `wait` (unless the signal handler
    # overrides that).
    # In the case of Dash, it looks like `set -e` (set at the beginning
    # of this script) gets precedence over signal handling. Therefore,
    # when `wait` is interrupted, its exit code is non-zero and because
    # of `set -e`, the script terminates immediately without running the
    # signal handler. To work around this issue, we use "|| true" to
    # force that statement to succeed and the signal handler to properly
    # execute. Because the statement below has an exit code of 0, the
    # signal handler has to restate the expected exit code.
    wait "$rabbitmq_server_pid" || true
fi