容器启动Mysql5.7占用太大内存的问题

javajianghu · May 24, 2024 · c8d9684 · c8d9684
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+        - [Mysql容器启动内存异常占用的问题](/md/2024-05-24-Mysql容器启动内存异常占用的问题.md)
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diff --git a/md/2024-05-24-Mysql容器启动内存异常占用的问题.md b/md/2024-05-24-Mysql容器启动内存异常占用的问题.md
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+# 问题回顾
+使用一下docker-compose.yaml启动了mysql容器。
+
+启动成功后，使用free -mh查看宿主机内存占用情况，并用docket stats 查看容器情况，mysql竟然占用了16个G
+
+## docker-compose.yaml
+```yaml
+version: '3.9'
+services:
+  mysql:
+    image: mysql:5.7.29
+    restart: on-failure
+    container_name: mysql
+    environment:
+      - TZ=Asia/Shanghai
+      - MYSQL_ROOT_PASSWORD=123456
+    volumes:
+      - /etc/localtime:/etc/localtime:ro
+      - ${PWD}/config/my.cnf:/etc/mysql/my.cnf
+      - ${PWD}/data:/var/lib/mysql
+      - ${PWD}/logs:/usr/local/mysql/log
+    ports:
+      - 3306:3306
+```
+## my.cnf 配置
+```
+[mysqld]
+lower_case_table_names=1
+port=3306
+```
+
+## docker stats Mysql占用了16G
+![Mysql占用了16G](./assets/Snipaste_2024-05-24_10-29-45.png)
+
+## 问题排查
+
+进入到容器内部
+```shell
+docker exec -it mysql
+```
+
+使用top命令，提示命令不存在，那么执行下面命令，安装top命令
+```shell
+apt install procps
+```
+
+执行top，并按m键，发现只有mysqld这个进程占用内存。
+![mysqld这个进程占用内存](./assets/Snipaste_2024-05-24_10-54-52.png)
+
+这就很奇怪了。
+
+在google下发现了这篇文章。
+
+[**docker启动mysql时内存占用过多**](https://blog.chenwx.top/p/docker-mysql-event1.html)
+
+
+# 原因分析：
+文章指出
+**这个问题的直接原因是文件描述符上限太大了;**
+
+## 原文截图
+![原文截图](./assets/Snipaste_2024-05-24_14-52-20.png)
+
+
+于是我修改下docker-compose启动脚本
+```yaml
+version: '3.9'
+services:
+  mysql:
+    image: mysql:5.7.29
+    restart: on-failure
+    container_name: mysql
+    environment:
+      - TZ=Asia/Shanghai
+      - MYSQL_ROOT_PASSWORD=123456
+    ulimits:
+      nproc: 65535
+      nofile:
+        soft: 26677
+        hard: 46677
+    volumes:
+      - /etc/localtime:/etc/localtime:ro
+      - ${PWD}/config/my.cnf:/etc/mysql/my.cnf
+      - ${PWD}/data:/var/lib/mysql
+      - ${PWD}/logs:/usr/local/mysql/log
+    ports:
+      - 3306:3306
+```
+重新run了容器，发现内存下来了。
+```shell
+root@betterme:/data/soft/mysql# free -mh
+               total        used        free      shared  buff/cache   available
+Mem:            27Gi       2.3Gi        19Gi       7.8Mi       5.2Gi        24Gi
+Swap:          8.0Gi          0B       8.0Gi
+```
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