排查无法连接Redis服务器故障（无法连上redis服务器）

No matter what kind of project generally uses Redis, it can bring a lot of convenience to the project, but sometimes unexpected problems may occur when connecting to the Redis server. In order to ensure the normal operation of Redis, this article will introduce some troubleshooting when connecting to Redis server fls.

First of all, it is necessary to make sure that Redis server is installed correctly. We can log in to the server hosting Redis and execute the redis-cli.exe command to confirm whether it can be connected properly. If a connection exception occurs, it is usually due to an incorrect installation. If it is not a problem of installation, you can check the Redis server configuration file and check the ports, IP addresses and passwords set by Redis.

Second, check the client connection limit. To ensure that the other connections that we make won’t be blocked, we need to first check the maximum number of connections set by the client connection. Usually, specify the maximum number of connections in the configuration file. If the maximum number of connections is not set, there may be too many connections from other clients that block our connections.

We can also use the telnet command to check if the port number of the Redis server can be connected properly. If the connection fls, it means that there is a problem with the port number of the Redis server, or the IP address or port number of the Redis server is blocked by the firewall. For example, the following telnet commands are used to connect Redis server port 6379:

telnet 127.0.0.1 6379

Finally, if all of the above solutions are not suitable, you can consider upgrading or reinstalling the Redis server version. The latest version of Redis contns many improvements, which can solve many connection errors.

Troubleshooting a connection flure to the Redis server is not a difficult task. All we need to do is check the installation, configuration, client connection limits, port numbers, and upgrade or reinstall the server version. With these troubleshooting methods, we can solve most connection exceptions and ensure the normal operation of Redis.