Shulou(Shulou.com)06/03 Report--

What is the reason for the slow access to the CVM? There may be many reasons why the access speed of the CVM is very slow. First of all, we need to log in to the backend server or the monitoring platform to check whether the system resources have reached the upper limit, such as CPU, memory, disk, Imax O, network bandwidth and so on.

1.CPU and memory load is too high

If it is caused by a normal increase in traffic, consider the expansion of the CVM. If it is a performance problem, you can find the slow query code through the log, check the processes occupied by CPU, and then use the jstack command to generate the stack information of the process.

two。 Insufficient bandwidth for server egress

After the user visits to the website, the concurrency is large, the exit bandwidth allocated to the user will become smaller and the bandwidth can be increased. Check the request log of the Web server to see if there is a ddos attack.

3. Memory or disk space is full

Kill the useless process, check the log of the application that occupies a high number of processes, and optimize its application.

Increase the memory, use pstack and other tools to check the pid of the corresponding process, locate the cause of the failure according to the system call, and clean the disk in time if the space is full.

4.I/O read and write load is too high

Because reading the database causes the IO of the CVM to be too high, which is usually caused by slow query, leave it to the developer to optimize.

If too much Web access leads to a large number of log writes, you can consider temporarily shutting down the log or optimizing the log; if the IO is too high due to writing to the database, increase the cache memory parameters of DB or upgrade the hard disk and replace the hard disk with SSD hard disk.

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