排查vm上redis连接失败问题（vm redis连接不上）

Nowadays, Redis is a popularly used data storage. Redis can provide an excellent memory caching system or a powerful message broker, protecting the data storage capabilities of large applications.

When an application is running on the virtual machine (VM) environment, the connection of Redis may fl. When Redis connection flure occurs, it can bring a lot of trouble to users and even make the system completely halt, so it is necessary to troubleshoot Redis connection flure on the VM.

First, we need to check whether there is any problem in the Redis configuration of the VM. For example, checking if the port settings of Redis is wrong, if you can connect with other programs, if the timeout settings on the VM is too short and so on. We can log the VM settings to file and use the terminal tool to diagnose it.

The second step is to make sure that the network connectivity of the VM is normal and ensure the opening of the required port settings. We can use the ping command to check the basic network integrity of the machine, and use the telnet command to check whether the VM Redis port is open. If there is an issue, we can restart the VM Network Service or make necessary adjustments to the firewall settings.

Next, we need to make sure that the sources of the user’s code is correct. For example, if the code for broker type is specified incorrectly, it may also lead to connection flure. We can use the source debugging tool to debug the execution of the user’s code and verify the syntax and any error of the connection detls.

Finally, we need to check the status of the server. If the server used is of low configuration and cannot handle high throughput, leading to Redis crash or memory overloading problem, we can upgrade the server or optimize the configuration.

To sum up, when Redis connection flure occurs on the VM, we need to take proper measures to troubleshoot the problem such as verifying the Redis configuration on the VM, ensure the network connectivity, checking the client code and optimizing the server status. After doing all these, we should be able to make the VM Redis connection run normally agn.