MacOS下Rancher Desktop部署Bitnami MySQL Helm Chart Pod启动失败

问题复现步骤 #

• 本地环境为MacOS，使用Rancher Desktop
• 采用默认配置
• 执行命令：helm install my-release bitnami/mysql
• Pod启动失败，处于CrashLoopBackOff状态

错误信息 #

% kubectl get pods                     
NAME                 READY   STATUS             RESTARTS        AGE
my-release-mysql-0   0/1     CrashLoopBackOff   6 (3m12s ago)   8m57s

% kubectl logs my-release-mysql-0
/usr/lib: './var/cache/ldconfig': Permission denied
/usr/lib: './proc/tty/driver': Permission denied
/usr/lib: './root': Permission denied
/usr/lib: './etc/ssl/private': Permission denied
mysql Wed Aug 24 23:07:43 UTC 2022INFO  ==> ** Starting MySQL **
2022-08-24T23:07:43.299737Z 0 [Warning] [MY-010939] [Server] Failed to get absolute path of program executable --defaults-file=/opt/bitnami/mysql/conf/my.cnf
2022-08-24T23:07:43.933997Z 0 [Warning] [MY-010918] [Server] 'default_authentication_plugin' is deprecated and will be removed in a future release. Please use authentication_policy instead.
2022-08-24T23:07:43.934191Z 0 [System] [MY-010116] [Server] --defaults-file=/opt/bitnami/mysql/conf/my.cnf (mysqld 8.0.30) starting as process 1
2022-08-24T23:07:43.953718Z 0 [Warning] [MY-013242] [Server] --character-set-server: 'utf8' is currently an alias for the character set UTF8MB3, but will be an alias for UTF8MB4 in a future release. Please consider using UTF8MB4 in order to be unambiguous.
2022-08-24T23:07:43.954132Z 0 [Warning] [MY-013244] [Server] --collation-server: 'utf8mb3_general_ci' is a collation of the deprecated character set UTF8MB3. Please consider using UTF8MB4 with an appropriate collation instead.
2022-08-24T23:07:43.956530Z 0 [Warning] [MY-010091] [Server] Can't create test file /bitnami/mysql/data/mysqld_tmp_file_case_insensitive_test.lower-test
2022-08-24T23:07:43.956655Z 0 [Warning] [MY-010159] [Server] Setting lower_case_table_names=2 because file system for /bitnami/mysql/data/ is case insensitive
2022-08-24T23:07:43.957378Z 0 [ERROR] [MY-013276] [Server] Failed to set datadir to '/bitnami/mysql/data/' (OS errno: 2 - No such file or directory)
2022-08-24T23:07:43.958983Z 0 [ERROR] [MY-010119] [Server] Aborting
2022-08-24T23:07:43.962276Z 0 [System] [MY-010910] [Server] --defaults-file=/opt/bitnami/mysql/conf/my.cnf: Shutdown complete (mysqld 8.0.30)  Source distribution.

注意：相同操作在Ubuntu 20.04机器上可正常运行。

解决方案 #

方法1：调整Rancher Desktop存储驱动 #

1. 打开Rancher Desktop设置界面，切换到「Virtual Machine」标签页
2. 将存储驱动从默认的virtiofs改为overlay
3. 重启Rancher Desktop生效
4. 清理现有失败的部署和存储卷：

   helm uninstall my-release
   kubectl delete pvc data-my-release-mysql-0
   

5. 重新执行安装命令：helm install my-release bitnami/mysql

方法2：禁用安全上下文约束（临时应急方案） #

如果无法调整存储驱动，可在安装时禁用容器的安全上下文限制：

helm install my-release bitnami/mysql --set securityContext.enabled=false --set containerSecurityContext.enabled=false

核心原因：MacOS上Rancher Desktop默认的virtiofs存储驱动在处理容器内目录权限和文件创建时存在兼容性问题，切换为overlay驱动可解决这类文件系统相关的权限、目录不存在错误。

内容的提问来源于stack exchange，提问作者Jerrod Horton