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How to build a stand-alone Redis cache service

1. Install gcc[root@localhost~]#yuminstallgcc Loaded plug-in: fastestmirror,langpacksbase|3.6kB00:00:00Loadingmirrorspeedsfromcachedhostfile*base: Resolving dependencies-->Checking transactions--->Software package gcc.x86_64.0.4 .8.5-16.el7 will be upgraded ---> Package gcc.x86_64.0.4.8.5-44.el7 will be updated --> Processing dependency libgomp=4.

May 26, 2023 pm 11:26 PM

redis

What will happen if Redis memory is too large?

1. When the main database is down, let’s first look at the disaster recovery process when the main database is down: As shown below, when the main database is down, our most common disaster recovery strategy is “cutting off the master”. Specifically, it selects a slave library from the remaining slave libraries of the cluster and upgrades it to the master library. After the slave library is upgraded to the master library, the remaining slave libraries are mounted under it to become its slave library, and finally the entire master-slave database is restored. Cluster structure. The above is a complete disaster recovery process, and the most costly process is the remounting of the slave library, not the switching of the main library. This is because redis cannot continue to synchronize data from the new main database after the main database changes based on synchronization points like mysql and mongodb. In the redis cluster, once the slave database changes master, Redis's approach is to clear the slave database that replaced the master database and then complete the synchronization from the new master database.

May 26, 2023 pm 11:19 PM

redis

How to solve common latency problems in Redis

Using highly complex commands If you find that the access delay suddenly increases when using Redis, how can you troubleshoot? First of all, the first step is to check the slow log of Redis. Redis provides a statistics function for slow log commands. Through the following settings, we can check which commands have a large delay during execution. First set the slow log threshold of Redis. Only commands that exceed the threshold will be recorded. The unit here is microseconds. For example, set the slow log threshold to 5 milliseconds and set only the latest 1000 slow log records to be retained: # Command execution exceeds 5 Millisecond record slow log CONFIGSETslowlog-log-slower-than5000#Only keep the latest 1000 slow logs

May 26, 2023 pm 10:50 PM

redis

How to integrate SpringBoot with Redis

1. Introduce dependency org.springframework.bootspring-boot-starter-data-redis2.4.4 2. Backend code: spring.redis.database=0spring.redis.host=192.168.1.xxxspring.redis.port=8099spring.redis. jedis.pool.max-active=8spring.redis.jedis.pool.max-wait=-1msspring.redis.jedis.pool.max-i

May 26, 2023 pm 10:31 PM

redisSpringBoot

What is the underlying principle of redis

Redis core object There is a "core object" in Redis called redisObject, which is used to represent all keys and values. The redisObject structure is used to represent the five data types of String, Hash, List, Set, and ZSet. The source code of redisObject is in redis.h, written in C language. If you are interested, you can check it out by yourself. I have drawn a picture here about redisObject, which shows the structure of redisObject as follows: In redisObject, "type indicates which type it belongs to" Data type, encoding represents the storage method of the data", that is, the underlying

May 26, 2023 pm 10:21 PM

redis

How to use Redis in Golang distributed applications

Text Redis is a high-performance in-memory database that is often used in distributed systems. In addition to being a distributed cache or a simple in-memory database, it also has some special application scenarios. This article combines Golang to write the corresponding middleware. In a distributed lock stand-alone system, we can use sync.Mutex to protect critical resources. There is also such a demand in a distributed system. When multiple hosts seize the same resource, a corresponding "distributed lock" needs to be added. In Redis, we can use the setnx command to set the corresponding value if the key does not exist. If the setting is successful, the lock will be successful. If the key does not exist and return failure, the lock release can be achieved through del. The main logic is as follows: typeRedisLoc

May 26, 2023 pm 10:07 PM

Golangredis

How to install redis extension in docker php container

1. Download the redis extension package redis extension download address https://pecl.php.net/package/redis 2. Unzip the extension package $tar-zxvfredis-5.3.4.tgz Unzip the redis extension package 3. Copy the extension package to the PHP container 3.1 View the container dockerps-a3.2 Copy the extension package to the PHP container dockercpdockercp/docker/tool/redis-5.3.4php:/usr/src/php/ext/redis#/docker/tool/redis-5.3.4 The address of the unzipped package #php:container

May 26, 2023 pm 10:01 PM

DockerPHPredis

How to use redis to implement countdown tasks

An example is as follows: importredisimporttimedefevent_handler(msg):'''After listening to any key expiration, the message obtained is as follows msg={'type':'pmessage',#Return value type 'pattern':'__keyevent@2__:expired',# Source 'channel'

May 26, 2023 pm 09:58 PM

redis

What are the various data types and cluster-related knowledge in redis?

Various data types The string type is simple and convenient, and supports space pre-allocation, that is, more space will be allocated each time, so that if the string becomes longer next time, there is no need to apply for additional space. Of course, the premise is that the remaining space is enough. . [Related recommendation: Redis video tutorial] The List type can implement a simple message queue, but please note that there may be message loss, and it does not support ACK mode. The Hash table is a bit like a relational database, but when the hash table becomes larger and larger, please be careful to avoid using statements such as hgetall, because requesting a large amount of data will cause redis to block, so the brothers behind will have to wait. The set collection type can help you do some statistics, for example, if you want statistics

May 26, 2023 pm 09:40 PM

redis

How to open and close redis in Linux

Redis is a high-performance key-value database. The emergence of redis has largely compensated for the shortcomings of keyvalue storage such as memcached, and can play a very good supplementary role to relational databases in some situations. 1. Start: redis-server (redis-serverredis.conf) 2. Log in: redis-cli (redis-cli-p6379) 3. Close: redis-clishutdown

May 26, 2023 pm 09:16 PM

Linuxredis

How to start redis under linux system

1. Start directly into the redis root directory and execute the command: #Add the '&' sign to make redis run as a background program nohupredis-server& 2. Start by specifying the configuration file to start the specified configuration file for the redis service, for example, configure it as /etc/ redis/6379.conf Enter the redis root directory and enter the command: ./redis-server/etc/redis/6379.conf #If the port is changed, you also need to specify the port when using the redis-cli client to connect, for example: redis- cli-p63803

May 26, 2023 pm 09:00 PM

Linuxredis

How to set redis password in Linux system

After installing redis under the Linux system, no password is required by default, and you need to set the password yourself. First open the configuration file vimredis.conf, search for /requirepass in the command line state, then add requirepass123 in the insert mode, close redis/usr/local/redis/bin/redis-clishutdown, start redis/usr/local/redis/bin/redis-server/ usr/local/redis/etc/redis.conf Enter the client to view /usr/local/redis/bin/redis

May 26, 2023 pm 09:00 PM

Linuxredis

How to use redis publish and subscribe method to implement a simple messaging system

I. Basic use 1. Configuration We use SpringBoot2.2.1.RELEASE to build the project environment and directly add the redis dependency org.springframework.bootspring-boot-starter-data-redis in pom.xml. If our redis is the default configuration, then You don’t need to add any additional configuration; you can also configure it directly in the application.yml configuration, as follows spring:redis:host:127.0.0.1port:6379password:2. Use the publish/subscribe posture of redis, mainly using the two commands pu

May 26, 2023 pm 08:52 PM

redis

How to install redis server under debian

To install Redis on Ubuntu system, use the source to install Redis. Use the following command: apt-getupdateapt-getinstallredis-server to start Redis. Redis-server checks whether redis starts redis-cli. The above command will open the following terminal: redis127.0.0.1:6379>127.0.0.1 is the current terminal. Machine IP, 6379 is the redis service port. Now we enter the PING command. redis127.0.0.1:6379>pingPONG The above shows that we have successfully installed redis.

May 26, 2023 pm 08:42 PM

redisdebian