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I've built/installed MariaDB v10.0.13 (r4346) from src.
mysqld -V
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mysqld Ver 10.0.13-MariaDB for Linux on x86_64 (Source distribution)
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My build config includes
cmake .. --debug-output \
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-DCMAKE_BUILD_TYPE="Release" \
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-DCMAKE_INSTALL_PREFIX=/usr/local/mariadb \
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-DINSTALL_LAYOUT=STANDALONE \
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-DINSTALL_SYSCONFDIR=/usr/local/etc/mariadb.DEFAULT \
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-DINSTALL_SYSCONF2DIR=/usr/local/etc/mariadb.DEFAULT/conf.d \
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-DDEFAULT_SYSCONFDIR=/usr/local/etc/mariadb \
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...
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With this config, and the 'docs' below, a config in
/usr/local/etc/mariadb/my.cnf
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should be searched for, found, and used.
It's not.
Here's the ENV.
MariaDB (via systemd) is launched with
/usr/local/mariadb/bin/mysqld --defaults-file=/usr/local/etc/mariadb/my.cnf --basedir=/usr/local/mariadb --datadir=/var/db/mariadb --plugin-dir=/usr/local/mariadb/lib/plugin --log-error=/var/log/mariadb/mariadb-err.log --pid-file=/var/cache/mariadb/mariadb.pid --socket=/var/cache/mariadb/mariadb.sock --port=3306
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Note
cat CMakeLists.txt
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...
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IF(INSTALL_SYSCONFDIR)
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SET(DEFAULT_SYSCONFDIR "${INSTALL_SYSCONFDIR}")
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ENDIF()
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...
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&
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cat ./cmake/install_layout.cmake
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...
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# - INSTALL_SYSCONFDIR (my.cnf config file. Usually /etc or nothing)
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# - INSTALL_SYSCONF2DIR (additional config files, e.g. /etc/mysql/conf.d)
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...
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&
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cat ./scripts/CMakeLists.txt
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...
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IF(INSTALL_SYSCONFDIR)
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SET(sysconfdir ${DEFAULT_SYSCONFDIR})
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ELSE()
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SET(sysconfdir "/etc")
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ENDIF()
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...
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&
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cat ./mysys/my_default.c
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...
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/* Which directories are searched for options (and in which order) */
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...
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/*
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This structure defines the context that we pass to callback
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function 'handle_default_option' used in search_default_file
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to process each option. This context is used if search_default_file
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was called from load_defaults.
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*/
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struct handle_option_ctx
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...
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/**
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Create the list of default directories.
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@param alloc MEM_ROOT where the list of directories is stored
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@details
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The directories searched, in order, are:
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- Windows: GetSystemWindowsDirectory()
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- Windows: GetWindowsDirectory()
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- Windows: C:/
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- Windows: Directory above where the executable is located
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- Unix: /etc/ or the value of DEFAULT_SYSCONFDIR, if defined
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- Unix: /etc/mysql/ unless DEFAULT_SYSCONFDIR is defined
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- ALL: getenv("MYSQL_HOME")
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- ALL: --defaults-extra-file=<path> (run-time option)
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- Unix: ~/
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On all systems, if a directory is already in the list, it will be moved
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to the end of the list. This avoids reading defaults files multiple times,
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while ensuring the correct precedence.
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@retval NULL Failure (out of memory, probably)
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@retval other Pointer to NULL-terminated array of default directories
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*/
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...
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&
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@ https://mariadb.com/kb/en/mariadb/documentation/getting-started/configuring-mariadb-with-mycnf/
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On a Linux, Unix or Mac server, MariaDB looks for the my.cnf file in the following locations:
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Location Scope
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/etc/my.cnf Global
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/etc/mysql/my.cnf Global
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SYSCONFDIR/my.cnf Global
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$MYSQL_HOME/my.cnf Server
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defaults-extra-file File specified with --defaults-extra-file=path, if any
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/.my.cnf User
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SYSCONFDIR is the directory specified with the CMake SYSCONFDIR option when MariaDB was built, by default etc under the compiled-in installation directory.
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With x.13, changes to my config in
/usr/local/etc/mariadb/my.cnf
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are NOT correctly picked up by any mysql client tools.
For example, if in my.cnf I add
...
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[client]
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user = root
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password = 'XXXXXX'
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...
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and it's correctly picked up, then at shell, instead of
mysqlshow -u root -p
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password: XXXXXX
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I should be able to just
with the in-config, specified user= & password= optiont picked up.
But, with MariaDB 10.0.13, config file changes are simply ignored.
Checking, If I
I see
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stat("/usr/local/etc/mariadb.DEFAULT/my.cnf", {st_mode=S_IFREG|0644, st_size=202, ...}) = 0
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open("/usr/local/etc/mariadb.DEFAULT/my.cnf", O_RDONLY) = 3
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fstat(3, {st_mode=S_IFREG|0644, st_size=202, ...}) = 0
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mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f1db94ec000
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read(3, "#\n# This group is read both both"..., 4096) = 202
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openat(AT_FDCWD, "/etc/my.cnf.d/", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 4
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getdents(4, /* 3 entries */, 32768) = 88
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getdents(4, /* 0 entries */, 32768) = 0
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close(4) = 0
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stat("/etc/my.cnf.d/default_plugins.cnf", {st_mode=S_IFREG|0640, st_size=122, ...}) = 0
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open("/etc/my.cnf.d/default_plugins.cnf", O_RDONLY) = 4
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fstat(4, {st_mode=S_IFREG|0640, st_size=122, ...}) = 0
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mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f1db94eb000
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read(4, "[server]\n#plugin-load=blackhole="..., 4096) = 122
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read(4, "", 4096) = 0
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close(4) = 0
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munmap(0x7f1db94eb000, 4096) = 0
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read(3, "", 4096) = 0
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close(3) = 0
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munmap(0x7f1db94ec000, 4096) = 0
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stat("/root/.my.cnf", {st_mode=S_IFREG|0644, st_size=8792, ...}) = 0
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open("/root/.my.cnf", O_RDONLY) = 3
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...
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Notice,
stat("/usr/local/etc/mariadb.DEFAULT/my.cnf", {st_mode=S_IFREG|0644, st_size=202, ...}) = 0
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open("/usr/local/etc/mariadb.DEFAULT/my.cnf", O_RDONLY) = 3
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then
stat("/root/.my.cnf", {st_mode=S_IFREG|0644, st_size=8792, ...}) = 0
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open("/root/.my.cnf", O_RDONLY) = 3
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is searched. There's no indication at all that the specified dir
-DDEFAULT_SYSCONFDIR=/usr/local/etc/mariadb \
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is searched.
This is consistent with
$ mysqldump --help
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...
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Default options are read from the following files in the given order:
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/usr/local/etc/mariadb.DEFAULT/my.cnf ~/.my.cnf
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...
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where, as in the strace ^^^, that those are the ONLY two locations checked – DESPITE having specified all of
-DINSTALL_SYSCONFDIR=/usr/local/etc/mariadb.DEFAULT \
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-DINSTALL_SYSCONF2DIR=/usr/local/etc/mariadb.DEFAULT/conf.d \
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-DDEFAULT_SYSCONFDIR=/usr/local/etc/mariadb \
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Verifying what DOES work, starting with
ls -al /usr/local/etc/mariadb/my.cnf /etc/my.cnf /root/.my.cnf
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ls: cannot access /etc/my.cnf: No such file or directory
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ls: cannot access /root/.my.cnf: No such file or directory
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-rw-r--r--+ 1 root mysql 8.7K Aug 11 17:48 /usr/local/etc/mariadb/my.cnf
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given a config that includes
grep "\[client\]" /usr/local/etc/mariadb/my.cnf -A2
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[client]
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user = root
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password = 'xxxxxx'
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the file's only picked up if it exists in /root/.my.cnf
mysqlshow
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mysqlshow: Access denied for user 'root'@'localhost' (using password: NO)
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ln -sf /usr/local/etc/mariadb/my.cnf /etc/my.cnf
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mysqlshow
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mysqlshow: Access denied for user 'root'@'localhost' (using password: NO)
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rm -f /etc/my.cnf
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ln -sf /usr/local/etc/mariadb/my.cnf /root/.my.cnf
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mysqlshow
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+------------------------------+
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| Databases |
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+------------------------------+
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| information_schema |
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| mysql |
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| performance_schema |
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| test |
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+------------------------------+
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Bottom line:
The docs and behavior of default config-file location/use are inconsistent (and likely have been for years).
There should be a clear, consistent, documented search order, and an option to override – at build- (maybe run-, too) time with an abolute/exclusive location.
The current 'right' config option should be
-DDEFAULT_SYSCONFDIR= /path/to/dir/that/contains/my.cnf/
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which, if defined, should limit search path to ONLY that dir, overriding all other search paths.
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