python modules in use rabbitmq

The first is to install rabbitmq friends. I believe this will be linux and windows people should be able to install it!

Specific installation methods Baidu. But when I install linux, had wanted to install the source code, but it seems to install the file in question, I do not know if he did not C language compiler package. Now without him, I finally installed RPM package.

The two installation package, I have to share it, we all go to download it.

erlang19.0.4-1 https://ftp.dgpm.co/s/zzc7sZbm8mxqe93

rabbitmq3.7.5 https://ftp.dgpm.co/s/NKx9HZmKfSKMys8

When installing rabbitmq, there is a small error, only need to install the support package can be resolved. It is this socat

yum install socat get a key.

After the installation is complete. The effect is such

There are some commonly used commands.

carried out:

/bin/systemctl stoprabbitmq-server.service #关闭

/bin/systemctl start rabbitmq-server.service #启动

/bin/systemctl status rabbitmq-server.service #状态

1. User Management

User management including increasing users, delete users, view the list of users, change user passwords.

The appropriate command

(1) add a user

rabbitmqctl add_user Username Password

(1.1) give the user authority to order

rabbitmqctl set_permissions -p "/" User'.*' '.*' '.*'

(1.2) gives the user command role

rabbitmqctl set_user_tags User administrator

(2) delete a user

rabbitmqctl delete_user Username

(3) modify the user's password

rabbitmqctl change_password Username Newpassword

(4) 查看当前用户列表

rabbitmqctl list_users

开启管理UI:

rabbitmq-plugins enable rabbitmq_management
firewall-cmd --zone=public --add-port=15672/tcp --permanent
firewall-cmd --reload
最后的的是防火墙开放端口。大家都懂得。

有一个用的比较多的命令，查看队列的。就是rabbitmqctl list_queues
查看队列和消息数量。

--------------------------------好了，rabbitMQ的安装就介绍了这里了吧------------------------------------------

现在开始说在python里面生产者和消费者的代码，刚开始消费者一直有一个报错。我都迷糊，查了好多资料，都解决不了，最后才知道，是rabbitmq的参数位置变了，所以我的参数位置也要调整。

就是这个报错，我都快懵了。

python生产者代码：

#_*_coding:utf-8_*_
#author:david.z

import pika
import random
credentials=pika.PlainCredentials('david','123')  #这里做了一个用户身份认证识别
connection=pika.BlockingConnection(
    pika.ConnectionParameters('IP地址',5672,'/',credentials) #这里是连rabbitmq
)
channel=connection.channel()  #声明一个管道
#声明queue

channel.queue_declare(queue='PMC2',durable=True)  #加True是为管道持久化

#n RabbitMQ a message can never be sent directly to queue,it always
# list=['我爱北京天安门','天安门上太阳升','鱼戏莲叶东，',' 鱼戏莲叶西，','鱼戏莲叶南，',' 鱼戏莲叶北。']
# for i in list:
# 
#     print (i)

channel.basic_publish(exchange='',
                      routing_key='PMC2',
                      body="我爱北京天安门",
                      properties=pika.BasicProperties(
                          delivery_mode=2, #模式为2是为了消息持久化
                      ))
print ("[x] Sent 'Hello World!'")
connection.close()

python消费者代码：

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Time    : 2018/2/22 15:57
# @Author  :david
# @File    : rabbitMQ_rescv_1.py
# @Software: PyCharm

import pika
credentials = pika.PlainCredentials('david', '123')
connection = pika.BlockingConnection(pika.ConnectionParameters('IP地址',5672,'/',credentials))
channel = connection.channel()
channel.queue_declare(queue='PMC2',durable=True)
def callback(ch, method, properties, body):
    print(" [x] Received %r" % body.decode())
channel.basic_qos(prefetch_count=1) #加上这句可以实现负载平均化
channel.basic_consume('PMC2', #消费消息
                      callback,
                      True)
print(' [*] Waiting for messages. To exit press CTRL+C')
channel.start_consuming()

自此简单的生产者消费代码就出来了。

然后就是广播，用的exchange.这里一定要提醒一下，广播原理类似于收音机，他是会发广播。但是如果生产者如果下线，然后在上线，是不会收到，上线之前的广播的，因为广播是不会一直存的。过时就没了。

python modules in use rabbitmq

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