檢視mysqld和mysql預設讀取my.cnf的順序
···
mysql --help --verbose | grep 'my.cnf'
order of preference, my.cnf, $MYSQL_TCP_PORT,
/etc/my.cnf /etc/mysql/my.cnf /usr/local/mysql/etc/my.cnf ~/.my.cnf
mysqld --verbose --help | grep 'my.cnf'
/etc/my.cnf /etc/mysql/my.cnf /usr/local/mysql/etc/my.cnf ~/.my.cnf
my.cnf, $MYSQL_TCP_PORT, /etc/services, built-in default
報錯的表現
mysql
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)
stace mysql 指令的執行過程
strace /usr/local/mysql/bin/mysql
execve("/usr/local/mysql/bin/mysql", ["/usr/local/mysql/bin/mysql"], [/ 21 vars /]) = 0
= 0
stat("/etc/my.cnf", 0x7ffca8678640) = -1 ENOENT (No such file or directory)
stat("/etc/mysql/my.cnf", 0x7ffca8678640) = -1 ENOENT (No such file or directory)
stat("/usr/local/mysql/etc/my.cnf", {st_mode=S_IFREG|0644, st_size=3816, ...}) = 0
open("/usr/local/mysql/etc/my.cnf", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=3816, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fb9595ef000
read(3, "# For advice on how to change se"..., 4096) = 3816
read(3, "", 4096) = 0
close(3) = 0
munmap(0x7fb9595ef000, 4096) = 0
stat("/root/.my.cnf", 0x7ffca8678640) = -1 ENOENT (No such file or directory)
stat("/root/.mylogin.cnf", {st_mode=S_IFREG|0600, st_size=504, ...}) = 0
open("/root/.mylogin.cnf", O_RDONLY) = 3
删除.mylogin.cnf檔案
rm /root/.mylogin.cnf
rm: remove regular file ‘/root/.mylogin.cnf’? y
再次登入正常
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