Troubleshooting: MySQL containers in alicloud lightweight application servers stop automatically

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Details of the problem

Recently, I helped a graduate teacher to deploy a set of on alicloud lightweight application servers app Back end , Contains a MySQL Service instances and a set of Java Code .MySQL The deployment of is to use yum install docker Environmental Science , Then run one of them MySQL Containers .Java The deployment of is to use yum install jdk Environmental Science , And then run java -jar ${jar file } that will do . I deploy and run first MySQL service , Run again Jar file .

The operation of the whole deployment is not complicated , There should be no problem . But run start Jar When you file , The database connection error is always reported , As shown in the figure below ：

Face the problem , First of all, I was in the local IDEA Medium test start , But no error was reported .

Then I found that every time Java Run at startup jar In the process of packaging ,MySQL The container will stop . Even after the container hangs up , I will restart it manually right away ,MySQL The container will also stop again in twoorthree minutes .

This is depressing , function Jar package , How could it lead to MySQL Hang up ？

Question why

Finally, I realized that the alicloud lightweight application server may be configured too low , The server that the teacher chooses is the cheapest ,1 nucleus CPU,1G Memory . Start up Jar When you file ,MySQL The container stopped because of insufficient memory .

solve the problem

Find the cause , Then the problem will be solved .

There are two solutions ：

1. Upgrade server configuration . This is the simplest and most direct way .
2. Deploy in a way that consumes less resources .

In this deployment , I took the second approach , No more use and startup docker, Instead, the traditional method , A set of... Is deployed directly on the server MySQL service . Then the problem was solved .

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