[the problem has been solved] - MySQL uses the same yaml and NFS shared storage to report an error

Introduction ： I used to use nfs Of storageclass Create... In the cluster mysql5.7.33 Will report a mistake , But creating 5.7.37 Occasionally, it can start successfully , however mysql Set up -e MYSQL_ROOT_PASSWORD=deepwise It doesn't work . And mysql5.7.37 It cannot be used after entering the container localhost Connect . But change ceph Of storageclass,mysql5.7.33 It won't be wrong . Mount directly nfs Test with or without nodes .

Fault recurrence

k8s colony 1.20.15, Kernel version 4.20.17-042017-generic, System version ubuntu16.04

Compare machines

k3s A single node v1.23.2+k3s1, Kernel version 5.4.0-122-generic, System version ubuntu20.04

Conclusion

It is suspected that the error is caused by the problem of the kernel version .

See the article https://mp.weixin.qq.com/s/L6_LB4gtj_bzW3C8328o2w Although the problem is irrelevant, it gives a hint of inspiration .