python操作redis集群与Django中redis-session存储
一、对redis的单实例进行连接操作
strictRedis对象方法用于连接redis
指定主机地址,port与服务器连接,默认db是0,redis默认数据库有16个,在配置文件中指定database 16
根据不同的实例方法,与redis的命令对应
python3>>>import redis
>>>r = redis.StrictRedis(host='localhost', port=6379, db=0,password='root')
>>>r.set('lufei', 'guojialei')
True
>>>r.get('lufei')
'bar'
增删改查
>>> conn=redis.StrictRedis()
>>>
>>>
>>> conn.set("name1","alex1")
True
>>> conn.set("name2","wupeiqi")
True
>>>
>>>
>>> conn.set("name1","alex666")
True
>>> conn.delete("name2","name1")
2
>>> conn.keys()
[b'name3', b'name2', b'name1']
二、sentinel集群连接并操作
2.1 环境搭建:
[root@db01 ~]# redis-server /data/6380/redis.conf[root@db01 ~]# redis-server /data/6381/redis.conf
[root@db01 ~]# redis-server /data/6382/redis.conf
[root@db01 ~]# redis-sentinel /data/26380/sentinel.conf &
2.2 测试读写分离:
## 导入redis sentinel包>>> from redis.sentinel import Sentinel
##指定sentinel的地址和端口号
>>> sentinel = Sentinel([('localhost', 26380)], socket_timeout=0.1)
##测试,获取以下主库和从库的信息
>>> sentinel.discover_master('mymaster')
>>> sentinel.discover_slaves('mymaster')
##配置读写分离
#写节点
>>> master = sentinel.master_for('mymaster', socket_timeout=0.1)
#读节点
>>> slave = sentinel.slave_for('mymaster', socket_timeout=0.1)
###读写分离测试 key
>>> master.set('oldboy', '123')
>>> slave.get('oldboy')
'123'
2.3 python连接rediscluster集群测试:
redis cluster的连接并操作(python2.7.2以上版本才支持redis cluster,我们选择的是3.5)https://github.com/Grokzen/redis-py-cluster
--------------------
python3
>>> from rediscluster import StrictRedisCluster
>>> startup_nodes = [{"host": "127.0.0.1", "port": "7000"}]
### Note: decode_responses must be set to True when used with python3
>>> rc = StrictRedisCluster(startup_nodes=startup_nodes, decode_responses=True)
>>> rc.set("foo", "bar")
True
>>> rc.set("foo", "bar")
'bar'
补充:rediscluster 安装方式:
pip3 install redis-py-cluster
三、 redis存储session
django-redis-sessions 官方文档:https://pypi.org/project/django-redis-sessions/
dango-redis 官方文档:http://niwinz.github.io/django-redis/latest/#_configure_as_cache_backend
3.1 安装模块:
#安装模块pip3 install django-redis-sessions
#或者
pip3 install django-redis
3.2 创建django项目:
django-admin startproject mydjango
3.3 修改settings.py文件:
CACHES = {"default": {
"BACKEND": "django_redis.cache.RedisCache",
"LOCATION": "redis://127.0.0.1:6379/0",
"OPTIONS": {
"CLIENT_CLASS": "django_redis.client.DefaultClient",
"PASSWORD": "",
# "PARSER_CLASS": "redis.connection.HiredisParser",
# "SOCKET_TIMEOUT": 10,
# "CONNECTION_POOL_CLASS_KWARGS": {
# "max_connections": 2,
# }
}
}
}
#SESSION_COOKIE_AGE = 30 * 60 #设置session过期时间为30分钟
SESSION_ENGINE = 'django.contrib.sessions.backends.cache'
3.4 创建app01:
django-admin startapp app01
3.5 编写session视图函数 app01.views:
from django.shortcuts import render,HttpResponsedef set_session(request):
request.session['username']='chaoge'
request.session['age']=18
return HttpResponse("设置sesson成功")
def get_session(request):
username=request.session['username']
age = request.session['age']
return HttpResponse(username+":"+str(age))
3.6 添加url路由:
vim mydjango/urls.py
from django.contrib import adminfrom django.urls import path
from app01 import views
urlpatterns = [
path('set_session/',views.set_session),
path('get_session/',views.get_session),
path('admin/', admin.site.urls),
]
3.7 启动redis服务端,默认方式启动:
#& 把redis任务放在后台运行
redis-server &
redis-cli 连接无误
发送ping命令得到pong即可
3.8 启动django:
python3 manage.py runserver 0.0.0.0:8000
3.9 web窗口调试:
访问视图,设置一条session信息,存入redis数据库
访问视图,获取session信息
3.10 redis-cli客户端测试:
检查redis数据库,是否存在一条key
#查看存在的key
127.0.0.1:6379> keys *1) ":1:django.contrib.sessions.cachep220moqvxclz2hyjqmbybqs3v8ck2i39"
#获取这个key的值
127.0.0.1:6379> get :1:django.contrib.sessions.cachep220moqvxclz2hyjqmbybqs3v8ck2i39
"\x80\x04\x95!\x00\x00\x00\x00\x00\x00\x00}\x94(\x8c\busername\x94\x8c\x06chaoge\x94\x8c\x03age\x94K\x12u."
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