2台服务器部署负载均衡 两台服务器搭建集群

目录

1、修改linux配置文件

2、复制cookie内容

3、创建用户登录查看是否创建成功

4、重启后报错的问题

---

首先准备好环境，rabbit安装见：

centos7.9 安装rabbitmq

我是这个成功安装的基础上搭建的rabbitmq集群，

我安装的是普通集群，

192.168.1.61   rabbitmq1    （主）
192.168.1.62   rabbitmq2   (从)

1、修改linux配置文件

两台服务器修改如下：

vi /etc/hosts

 

使用命令查询主机是否修改：

hostnamectl

如果发现hostname名字没修改成host文件中的名字，执行命令修改：

hostnamectl set-hostname  rabbitmq1

2、复制cookie内容

首先切换到.erlang.cookie，所有的目录，默认是在：/var/lib/rabbimq

但有时候，命令ll -a 居然没有！！！然后怎么办？写了一个程序，连接到rabbitmq,发几条消息，消费几条消息，重启后，就生成了。

cd /var/lib/rabbitmq

把主服务器上的.erlang.cookie文件，复制到从服务器，相同的位置，可以把这个文件下载到本机，再上传到从服务器，或者使用命令复制，在主服务器上操作：

scp .erlang.cookie root@192.168.1.62:/var/lib/rabbitmq/.erlang.cookie

回车会提示输入root密码，输入回车就行

 然后授权， .erlang.cookie 文件权限只能是600，777我试过，不行的

chmod 600 .erlang.cookie

 

 要注意这里，刚刚复制过来的是root,用户，要修改过来

chown rabbitmq:rabbitmq /var/lib/rabbitmq/.erlang.cookie

主服务器执行如今命令：

rabbitmqctl stop_app
rabbitmqctl reset
rabbitmqctl start_app

如果报：You cannot reset a node when it is the only disc node in a cluster，执行：

rabbitmqctl force_reset

执行rabbitmqctl stop_app命令可能会报错：

[root@rabbitmq01 rabbitmq]# rabbitmqctl stop_app
Stopping rabbit application on node rabbit@rabbitmq01 ...
Error: unable to perform an operation on node 'rabbit@rabbitmq01'. Please see diagnostics information and suggestions below.

Most common reasons for this are:

 * Target node is unreachable (e.g. due to hostname resolution, TCP connection or firewall issues)
 * CLI tool fails to authenticate with the server (e.g. due to CLI tool's Erlang cookie not matching that of the server)
 * Target node is not running

In addition to the diagnostics info below:

 * See the CLI, clustering and networking guides on https://rabbitmq.com/documentation.html to learn more
 * Consult server logs on node rabbit@rabbitmq01
 * If target node is configured to use long node names, don't forget to use --longnames with CLI tools

DIAGNOSTICS
===========

attempted to contact: [rabbit@rabbitmq01]

rabbit@rabbitmq01:
  * connected to epmd (port 4369) on rabbitmq01
  * epmd reports: node 'rabbit' not running at all
                  no other nodes on rabbitmq01
  * suggestion: start the node

Current node details:
 * node name: 'rabbitmqcli-1562-rabbit@rabbitmq01'
 * effective user's home directory: /var/lib/rabbitmq
 * Erlang cookie hash: KiLCK6kZzMo9nB0K7pdlng==

 解决的办法是，输入命令：

systemctl start rabbitmq-server

就可以解决了

然后从服务器分别执行命令： 

rabbitmqctl stop_app
rabbitmqctl reset
rabbitmqctl join_cluster  rabbit@rabbitmq1   
rabbitmqctl start_app

可能会报以下错误：

[root@rabbitmq02 rabbitmq]# rabbitmqctl join_cluster  rabbit@rabbitmq01
Clustering node rabbit@rabbitmq02 with rabbit@rabbitmq01
Error: unable to perform an operation on node 'rabbit@rabbitmq01'. Please see diagnostics information and suggestions below.

Most common reasons for this are:

 * Target node is unreachable (e.g. due to hostname resolution, TCP connection or firewall issues)
 * CLI tool fails to authenticate with the server (e.g. due to CLI tool's Erlang cookie not matching that of the server)
 * Target node is not running

In addition to the diagnostics info below:

 * See the CLI, clustering and networking guides on https://rabbitmq.com/documentation.html to learn more
 * Consult server logs on node rabbit@rabbitmq01
 * If target node is configured to use long node names, don't forget to use --longnames with CLI tools

DIAGNOSTICS
===========

attempted to contact: [rabbit@rabbitmq01]

rabbit@rabbitmq01:
  * unable to connect to epmd (port 4369) on rabbitmq01: address (cannot connect to host/port)


Current node details:
 * node name: 'rabbitmqcli-1958-rabbit@rabbitmq02'
 * effective user's home directory: /var/lib/rabbitmq
 * Erlang cookie hash: KiLCK6kZzMo9nB0K7pdlng==

[root@rabbitmq02 rabbitmq]# systemctl start firewalld
[root@rabbitmq02 rabbitmq]# systemctl stop firewalld

解决的办法是，在主服务器和从服务上执行以下命令：先开启防火封墙，再关闭

systemctl start firewalld
 
 systemctl stop firewalld

3、创建用户登录查看是否创建成功

两台服务器分别执行命令，其中root是我自己定义，可以随意修改

rabbitmqctl add_user root root
rabbitmqctl set_user_tags root administrator
rabbitmqctl set_permissions -p / root ".*" ".*" ".*"

这样的方式还不够完善，一台挂了，另一台就无法消费消息了，所以， 要设置镜像模式：

 

 

查看集群状态：

rabbitmqctl cluster_status

集群搭建成功了

4、重启后报错的问题

  当关机然后第二天启动，发现服务无法启动：

[root@rabbitmq02 ~]# service rabbitmq-server   start
Redirecting to /bin/systemctl start rabbitmq-server.service
Job for rabbitmq-server.service failed because a timeout was exceeded. See "systemctl status rabbitmq-server.service" and "journalctl -xe" for details.
[root@rabbitmq02 ~]#

这里一定要注意：

一定先启动从节点，再启动主节点， 否则会一直卡在命令窗口