RabbitMq安装过程

安装Erlong
RabbitMQ是一个开源的遵循 AMQP协议实现的基于 Erlang语言编写，即需要先安装部署Erlang环境再安装RabbitMQ环境。需加注意的是，根据两者版本号的对应表安装相应版本的Erlang和RabbitMQ。
1.先下载：http://erlang.org/download/otp_src_20.3.tar.gz
2.解压：tar -xvf otp_src_20.3.tar.gz
3.准备环境：yum -y install make gcc gcc-c++ kernel-devel m4 ncurses-devel openssl-devel
4.进入目录：cd otp_src_20.3
5.设定安装规则：

./configure --prefix=/usr/local/erlang --with-ssl --enable-threads --enable-smp-support --enable-kernel-poll --enable-hipe --without-javac
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6.安装：make && make install
7.配置环境变量：

vim /etc/profile

添加配置：
#set erlang environment
ERL_PATH=/usr/local/erlang/bin
PATH=$ERL_PATH:$PATH

使配置生效：
source /etc/profile
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8.检验是否安装成功：erl

退出：halt().
参考博客链接：

https://blog.csdn.net/ws_kfxd/article/details/85858736
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安装Socat

yum install -y socat
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安装RabbitMQ
1.通过在线安装或者下载后rpm包后再上传到服务器上

rpm -Uvh https://github.com/rabbitmq/rabbitmq-server/releases/download/v3.8.9/rabbitmq-server-3.8.9-1.el7.noarch.rpm --nodeps
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如果遇到网络很慢的问题，建议下载rpm包，上传到Linux服务器

rpm -Uvh rabbitmq-server-3.8.9-1.el7.noarch.rpm --nodeps
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如果遇到erlang已安装且版本正确，但是RabbitMQ检测失败的情况，可以追加参数 —nodeps （不验证软件包依赖）

2.启用Rabbit MQ服务

systemctl enable rabbitmq-server
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3.启动Rabbit MQ服务

systemctl start rabbitmq-server
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查看服务状态

systemctl status rabbitmq-server
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4.停止服务

systemctl stop rabbitmq-server
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5.重启服务

systemctl restart rabbitmq-server
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参考博客链接：

https://blog.csdn.net/qq_39706515/article/details/119972725
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RabbitMq遇到的问题
问题1：erlang版本要求
解决方法：去官网下载要求的版本
问题2：erlang版本已经下载了要求的版本还是出现问题1的错误
解决方法：加上–nodeps参数

[root@localhost ]# rpm -ivh --nodeps rabbitmq-server-3.8.12-1.el7.noarch.rpm 
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问题3：启动rabbitmq报错

[root@localhost ]# systemctl start rabbitmq-server
Job for rabbitmq-server.service failed because the control process exited with error code. See "systemctl status rabbitmq-server.service" and "journalctl -xe" for details.
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解决方法：查看日志

[root@slave2 rabbitmq]# journalctl -xe
Feb 19 07:15:52 slave2 systemd[1]: Failed to start RabbitMQ broker.
-- Subject: Unit rabbitmq-server.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
   Unit rabbitmq-server.service has failed.
-- 
-- The result is failed.
Feb 19 07:15:52 slave2 systemd[1]: Unit rabbitmq-server.service entered failed state.
Feb 19 07:15:52 slave2 systemd[1]: rabbitmq-server.service failed.
Feb 19 07:16:01 slave2 polkitd[902]: Registered Authentication Agent for unix-process:52647:403980 (system bus name :1.27 [/usr/bin/pk
Feb 19 07:16:02 slave2 systemd[1]: rabbitmq-server.service holdoff time over, scheduling restart.
Feb 19 07:16:02 slave2 systemd[1]: Stopped RabbitMQ broker.
-- Subject: Unit rabbitmq-server.service has finished shutting down
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit rabbitmq-server.service has finished shutting down.
Feb 19 07:16:02 slave2 systemd[1]: Starting RabbitMQ broker...
-- Subject: Unit rabbitmq-server.service has begun start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit rabbitmq-server.service has begun starting up.
Feb 19 07:16:02 slave2 rabbitmq-server[52652]: /usr/lib/rabbitmq/bin/rabbitmq-server: line 82: exec: erl: not found
Feb 19 07:16:02 slave2 systemd[1]: rabbitmq-server.service: main process exited, code=exited, status=127/n/a
Feb 19 07:16:02 slave2 systemd[1]: Failed to start RabbitMQ broker.
-- Subject: Unit rabbitmq-server.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit rabbitmq-server.service has failed.
-- 
-- The result is failed.
Feb 19 07:16:02 slave2 systemd[1]: Unit rabbitmq-server.service entered failed state.
Feb 19 07:16:02 slave2 systemd[1]: rabbitmq-server.service failed.
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发现错误提示，找不到erl环境

Feb 19 07:16:02 slave2 rabbitmq-server[52652]: /usr/lib/rabbitmq/bin/rabbitmq-server: line 82: exec: erl: not found
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修改rabbitmq-server启动脚本（启动脚本位置可以在报错日志里面拿到我的是上面报错提示的/usr/lib/rabbitmq/bin/rabbitmq-server）在set -e下面添加两行

#erlang
export PATH=$PATH:/usr/local/erlang/bin
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这一步是配置erlang的环境变量 和安装erlang第七步相同。

[root@slave2 rabbitmq]# vim /usr/lib/rabbitmq/bin/rabbitmq-server 
#!/bin/sh
# vim:sw=4:et:
##  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 https://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) 2007-2021 VMware, Inc. or its affiliates.  All rights reserved.
##

set -e
#erlang
export PATH=$PATH:/usr/local/erlang/bin
# Get default settings with user overrides for (RABBITMQ_)
# Non-empty defaults should be set in rabbitmq-env
SCRIPTS_DIR=$(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"

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

check_start_params() {
    check_not_empty RABBITMQ_BOOT_MODULE
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参考博客链接：

https://blog.csdn.net/weixin_43914685/article/details/113871672
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因为安装时我遇到的错误是：

查看日志后的信息为：

因此解决方案是修改rabbitmq-server启动脚本。

当然也看到一些错误原因是是未设置host配置引起的：
host文件并未配置，mq服务要启动，需要对应的ip和主机名映射。

[root@xxxx /]# vim /etc/hosts

127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.38.110 xxxx
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获取主机名和ip:

[root@xxxx /]# hostname
xxxx
[root@xxxx /]# ifconfig
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访问：
guest用户默认只可以localhost(本机)访问
因此：
在rabbitmq的配置文件目录下（默认为：/etc/rabbitmq）创建一个rabbitmq.config文件。文件中添加如下配置（请不要忘记那个“.”）：

[{rabbit, [{loopback_users, []}]}].
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重启rabbitmq服务

systemctl restart rabbitmq-server
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如果仍不能用主机浏览器访问，可能需要关闭虚拟机的防火墙。

查看状态：systemctl status firewalld
关闭： systemctl stop firewalld
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参考博客链接：

https://www.cnblogs.com/qstudy/p/Linux.html
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