1.错误：

W: GPG error: http://repo.mysql.com/apt/debian buster InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 467B942D3A79BD29

原因：
更换三方源没有对应的Key

解决：
直接执行如下命令，比如我没有 467B942D3A79BD29，就需要执行

apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 467B942D3A79BD29

2.配置日志路径

root@e299293028b3:/etc/mysql# cat /etc/mysql/my.cnf
# Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA

#
# The MySQL  Server configuration file.
#
# For explanations see
# http://dev.mysql.com/doc/mysql/en/server-system-variables.html

[mysqld]
pid-file        = /var/run/mysqld/mysqld.pid
socket          = /var/run/mysqld/mysqld.sock
datadir         = /var/lib/mysql
secure-file-priv= NULL
#日志路径
log-error       =/var/log/mysql/error.log
log             =/var/log/mysql/mysql.log
long_query_time =2
log-slow-queries=/var/log/mysql/slowquery.log
# Custom config should go here
!includedir /etc/mysql/conf.d/