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Why does MySQL 5.7 inside a docker container always crash?
Posted by: budianto ip
Date: May 17, 2023 10:48PM

I have a MySQL 5.7 docker container that was provisioned via a docker-compose file, the file looks like this:

```yml
version: '3'

# Run command: docker compose --env-file .env.local up
services:
# Database
db_hm:
image: mysql:5.7
volumes:
- db_data_hm:/var/lib/mysql
restart: always
ports:
- '127.0.0.1:3316:3306'
environment:
MYSQL_ROOT_PASSWORD: ${HD_DB_PASSWORD}
MYSQL_DATABASE: ${HD_DB_NAME}
MYSQL_USER: ${HD_DB_USER}
MYSQL_PASSWORD: ${HD_DB_PASSWORD}
networks:
- wpsite_hm
# Wordpress
wordpress_hm:
depends_on:
- db_hm
build:
context: ./docker/wordpress
dockerfile: ./Dockerfile
read_only: false
ports:
- '8001:80'
expose:
- 80
restart: always
volumes:
- './:/var/www/html'
- './php.ini:/usr/local/etc/php/php.ini'
environment:
HDB_DB_HOST: ${HD_DB_HOST}
HDB_DB_USER: ${HD_DB_USER}
HDB_DB_NAME: ${HD_DB_NAME}
HDB_DB_PASSWORD: ${HD_DB_PASSWORD}
networks:
- wpsite_hm

volumes:
db_data_hm:
```

I have a stress test script created via JMeter. Whenever I run the test using 30 concurrent users, the MySQL container always log something like this:
```log
2023-01-28T19:23:59.927259Z 0 [Note] mysqld: ready for connections.
Version: '5.7.40' socket: '/var/run/mysqld/mysqld.sock' port: 3306 MySQL Community Server (GPL)
2023-01-28 19:24:20+00:00 [Note] [Entrypoint]: Entrypoint script for MySQL Server 5.7.40-1.el7 started.
2023-01-28 19:24:20+00:00 [Note] [Entrypoint]: Switching to dedicated user 'mysql'
2023-01-28 19:24:20+00:00 [Note] [Entrypoint]: Entrypoint script for MySQL Server 5.7.40-1.el7 started.
'/var/lib/mysql/mysql.sock' -> '/var/run/mysqld/mysqld.sock'
2023-01-28T19:24:21.595285Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2023-01-28T19:24:21.600648Z 0 [Note] mysqld (mysqld 5.7.40) starting as process 1 ...
2023-01-28T19:24:21.659734Z 0 [Note] InnoDB: PUNCH HOLE support available
2023-01-28T19:24:21.660855Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2023-01-28T19:24:21.660865Z 0 [Note] InnoDB: Uses event mutexes
2023-01-28T19:24:21.660870Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2023-01-28T19:24:21.660875Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.12
2023-01-28T19:24:21.660888Z 0 [Note] InnoDB: Using Linux native AIO
2023-01-28T19:24:21.664699Z 0 [Note] InnoDB: Number of pools: 1
2023-01-28T19:24:21.668572Z 0 [Note] InnoDB: Using CPU crc32 instructions
2023-01-28T19:24:21.673989Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2023-01-28T19:24:21.687345Z 0 [Note] InnoDB: Completed initialization of buffer pool
2023-01-28T19:24:21.691938Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2023-01-28T19:24:21.715903Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2023-01-28T19:24:21.723552Z 0 [Note] InnoDB: Log scan progressed past the checkpoint lsn 4363179685
2023-01-28T19:24:21.723590Z 0 [Note] InnoDB: Doing recovery: scanned up to log sequence number 4363179694
2023-01-28T19:24:21.723597Z 0 [Note] InnoDB: Database was not shutdown normally!
2023-01-28T19:24:21.723601Z 0 [Note] InnoDB: Starting crash recovery.
2023-01-28T19:24:21.989305Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2023-01-28T19:24:21.989429Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2023-01-28T19:24:21.989781Z 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2023-01-28T19:24:22.011166Z 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2023-01-28T19:24:22.012602Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2023-01-28T19:24:22.012633Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2023-01-28T19:24:22.013269Z 0 [Note] InnoDB: Waiting for purge to start
2023-01-28T19:24:22.064048Z 0 [Note] InnoDB: 5.7.40 started; log sequence number 4363179694
2023-01-28T19:24:22.065063Z 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
2023-01-28T19:24:22.072885Z 0 [Note] Plugin 'FEDERATED' is disabled.
2023-01-28T19:24:22.088705Z 0 [Note] InnoDB: Buffer pool(s) load completed at 230128 19:24:22
2023-01-28T19:24:22.127157Z 0 [Note] Found ca.pem, server-cert.pem and server-key.pem in data directory. Trying to enable SSL support using them.
2023-01-28T19:24:22.127199Z 0 [Note] Skipping generation of SSL certificates as certificate files are present in data directory.
2023-01-28T19:24:22.127213Z 0 [Warning] A deprecated TLS version TLSv1 is enabled. Please use TLSv1.2 or higher.
2023-01-28T19:24:22.127219Z 0 [Warning] A deprecated TLS version TLSv1.1 is enabled. Please use TLSv1.2 or higher.
2023-01-28T19:24:22.134621Z 0 [Warning] CA certificate ca.pem is self signed.
2023-01-28T19:24:22.136068Z 0 [Note] Skipping generation of RSA key pair as key files are present in data directory.
2023-01-28T19:24:22.153990Z 0 [Note] Server hostname (bind-address): '*'; port: 3306
2023-01-28T19:24:22.155336Z 0 [Note] IPv6 is available.
2023-01-28T19:24:22.155380Z 0 [Note] - '::' resolves to '::';
2023-01-28T19:24:22.155429Z 0 [Note] Server socket created on IP: '::'.
2023-01-28T19:24:22.175855Z 0 [Warning] Insecure configuration for --pid-file: Location '/var/run/mysqld' in the path is accessible to all OS users. Consider choosing a different directory.
2023-01-28T19:24:22.331036Z 0 [Note] Event Scheduler: Loaded 0 events
2023-01-28T19:24:22.334317Z 0 [Note] mysqld: ready for connections.
```

Note that, my server has 8 vCPU and 16 GB of RAM.

I'd searched for answers regarding this kind of issue, most were related to insufficient memory allocation. But during the test, the memory utilization was always below 40%. Other possibilities would be a corrupt database or something that killed the MySQL instance, but unfortunately, I can't see any message related to that.

Any kind of help will be much appreciated.

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Why does MySQL 5.7 inside a docker container always crash?
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May 17, 2023 10:48PM


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