启动失败
启动失败场景1_Could not open file mysqld.log
问题描述
rpm方式安装完数据库后启动数据库提示不能打开mysqld.log
12月 21 10:23:33 dtweb1 mysqld[26916]: 2023-12-21T02:23:33.925906Z 0 [ERROR] [MY-010187] [Server] Could not open file '/topsoft/mysqldb/logs/mysqld.log' for error logging: Permission denied
问题分析
--查看目录权限，发现是755，没问题
ls -ld /topsoft/mysqldb/logs
解决办法
重新单独设置文件权限，再次启动数据库不报错。
chmod 755 /topsoft/mysqldb/logs/mysqld.log
启动失败场景2_File './binlog.index' not found
问题描述
rpm方式安装完数据库后启动数据库提示无法找到binlog.index文件
mysqld: File './binlog.index' not found (OS errno 13 - Permission denied)
35:24.732753Z 0 [Warning] [MY-010091] [Server] Can't create test file /topsoft/mysql/mysqld_tmp_file_case_insensitive_test.lower-test
2023-12-21T01:35:24.732874Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.23) starting as process 108015
2023-12-21T01:35:24.736728Z 0 [Warning] [MY-010091] [Server] Can't create test file /topsoft/mysql/mysqld_tmp_file_case_insensitive_test.lower-test
2023-12-21T01:35:24.736760Z 0 [Warning] [MY-010091] [Server] Can't create test file /topsoft/mysql/mysqld_tmp_file_case_insensitive_test.lower-test
2023-12-21T01:35:24.738710Z 0 [ERROR] [MY-010119] [Server] Aborting
2023-12-21T01:35:24.738957Z 0 [System] [MY-010910] [Server] /usr/sbin/mysqld: Shutdown complete (mysqld 8.0.23) MySQL Community Server - GPL.
问题分析
发现/etc/my.cnf中无binlog参数，增加binlog参数再次启动数据库不再提示该错误
解决办法
log_bin = /topsoft/mysql/binlog #二进制日志文件前缀
binlog_format = ROW
binlog_expire_logs_seconds=604800 #mysql binlog日志文件保存的过期时间7天，过期后自动删除;默认值是0，不限制,这样会占用空间太多 单位秒
max_binlog_size = 1G #限制单个文件大小,默认大小:1,073,741,824,即1G,太大了
启动失败场景3_Can't create test file
问题描述
rpm方式安装完数据库后启动数据库提示 Can't create test file。头一回碰到很是懵，无从下手。
[root@dtweb1 mysqldb]# systemctl status mysqld8
● mysqld8.service - MySQL Server
Loaded: loaded (/usr/lib/systemd/system/mysqld8.service; disabled; vendor preset: disabled)
Active: failed (Result: exit-code) since 四 2023-12-21 10:23:33 CST; 2s ago
Docs: man:mysqld(8)
http://dev.mysql.com/doc/refman/en/using-systemd.html
Process: 26916 ExecStart=/usr/sbin/mysqld --defaults-file=/etc/my.cnf (code=exited, status=1/FAILURE)
Main PID: 26916 (code=exited, status=1/FAILURE)
12月 21 10:23:33 dtweb1 mysqld[26916]: 2023-12-21T02:23:33.921118Z 0 [Warning] [MY-010091] [Server] Can't create test file /topsoft/mysqldb/data/mysqld_tmp_file_case_insensitive_test.lower-test
12月 21 10:23:33 dtweb1 mysqld[26916]: 2023-12-21T02:23:33.921225Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.23) starting as process 26916
12月 21 10:23:33 dtweb1 mysqld[26916]: 2023-12-21T02:23:33.924665Z 0 [Warning] [MY-010091] [Server] Can't create test file /topsoft/mysqldb/data/mysqld_tmp_file_case_insensitive_test.lower-test
12月 21 10:23:33 dtweb1 mysqld[26916]: 2023-12-21T02:23:33.924694Z 0 [Warning] [MY-010091] [Server] Can't create test file /topsoft/mysqldb/data/mysqld_tmp_file_case_insensitive_test.lower-test
12月 21 10:23:33 dtweb1 mysqld[26916]: 2023-12-21T02:23:33.925906Z 0 [ERROR] [MY-010187] [Server] Could not open file '/topsoft/mysqldb/logs/mysqld.log' for error logging: Permission denied
12月 21 10:23:33 dtweb1 mysqld[26916]: 2023-12-21T02:23:33.925984Z 0 [ERROR] [MY-010119] [Server] Aborting
12月 21 10:23:33 dtweb1 mysqld[26916]: 2023-12-21T02:23:33.926240Z 0 [System] [MY-010910] [Server] /usr/sbin/mysqld: Shutdown complete (mysqld 8.0.23) MySQL Community Server - GPL.
12月 21 10:23:33 dtweb1 systemd[1]: mysqld8.service: main process exited, code=exited, status=1/FAILURE
12月 21 10:23:33 dtweb1 systemd[1]: Unit mysqld8.service entered failed state.
12月 21 10:23:33 dtweb1 systemd[1]: mysqld8.service failed.
分析过程
参考一博主的步骤，说是selinux参数未设置禁用导致
解决办法
selinux参数设置禁用，再次启动数据库不再提示该错误
sed -i "s/SELINUX=enforcing/SELINUX=disabled/g" /etc/selinux/config
setenforce 0
3306端口不通
问题描述
rpm方式安装完数据库后，数据库连接工具不能访问数据库，ip通端口不通
分析过程
刚开始以为是tcp中无3306端口导致，设置了禁用ipv6后依然不能访问，排除tcp中无3306端口导致。
[root@dtweb1 logs]# netstat -nltp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 127.0.0.1:59681 0.0.0.0:* LISTEN 109980/KvEdrSvc
tcp 0 0 0.0.0.0:58595 0.0.0.0:* LISTEN 1284/sshd
tcp 0 0 127.0.0.1:55566 0.0.0.0:* LISTEN 1700/logagent
tcp 0 0 0.0.0.0:10007 0.0.0.0:* LISTEN 114368/../jdk1.8//b
tcp 0 0 0.0.0.0:10008 0.0.0.0:* LISTEN 114368/../jdk1.8//b
tcp6 0 0 :::58595 :::* LISTEN 1284/sshd
tcp6 0 0 :::33060 :::* LISTEN 73573/mysqld
tcp6 0 0 127.0.0.1:8005 :::* LISTEN 114677/../jdk1.8/bi
tcp6 0 0 :::3306 :::* LISTEN 73573/mysqld
tcp6 0 0 :::63443 :::* LISTEN 1700/logagent
tcp6 0 0 :::8088 :::* LISTEN 114677/../jdk1.8/bi
--查看防火墙 发现并未开启防火墙
systemctl status firewalld
--禁用ipv6
vi /etc/sysctl.conf
##add by disable ipv6
net.ipv6.conf.all.disable_ipv6 =1
net.ipv6.conf.default.disable_ipv6 =1
net.ipv6.conf.eth0.disable_ipv6 =1
--生效
sysctl -p
解决办法
原因暂时未知，参考一博主的做法客户端竟然神奇的能访问数据库了。
--停止数据库
systemctl stop mysqld
--禁用开机启动
systemctl disable mysqld
--启动数据库 ，数据库连接成功
systemctl start mysqld
--设置开机启动
systemctl enable mysqld
服务器本地登录失败
问题描述
rpm方式安装完数据库后，服务器本地登录失败，提示不能连接sock文件
[root@dtweb1 logs]# mysql -uroot -p
Enter password:
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)
分析过程
查找服务器上都有哪些sock文件
--查找服务器上都有哪些sock文件
[root@dtweb1 logs]# find / -name mysql.sock
-rw-r--r-- 1 mysql mysql 342 Sep 27 14:27 /topsoft/mysql/mysql.sock
--指定-S 参数登录数据库，登录成功
mysql -uroot -p -S /topsoft/mysql/mysql.sock
解决办法
创建软链接，再次登录正常
ln -s /topsoft/mysql/mysql.sock /var/lib/mysql/mysql.sock