MARIADB and MySQL Coexist

The following is an official MARIADB document explaining how MARIADB is installed on a host that already exists on a MySQL instance:

https://mariadb.com/kb/en/library/installing-mariadb-alongside-mysql/

However, if you install the MARIADB first, then install MySQL, for example:

MariaDB binaries in /opt/mysql/ MariaDB -10.2.8-linux-x86_64/

In/usr/local/making a soft link, i.e.

ln -s /opt/mysql/mariadb-10.2.8-linux-x86_64/ mysql

See "MARIADB Installation" in the configuration is the same.

Attention during installation

The new MySQL instance configuration file, such as/ETC/MY3308.CNF, data and other files are set/data/mysql/mysql3308/{data,log,tmp}under.
The soft links made are:

ln -s /opt/mysql/mysql-5.7.19-linux-glibc2.12-x86_64/    mysql5.7

When initializing MySQL, be sure to specify the configuration file!!

cd /usr/local/mysql5.7./bin/mysqld --defaults-file=/etc/my3308.cnf --initialize

Initialization does not have an error, but the view log found error and multiple warning, see finally.
There is one error:

[ERROR] Can‘t read from messagefile ‘/opt/mysql/mariadb-10.2.8-linux-x86_64/share/english/errmsg.sys‘

In the configuration file, add a parameter to

[mysqld]language = /usr/local/mysql5.7/share/english

Start

Directly using the absolute path of the mysqld to start

/usr/local/mysql5.7/bin/mysqld --defaults-file=/etc/my3308.cnf &

Shut down

Directly using the absolute path of the mysqladmin to close

/usr/local/mysql5.7/bin/mysqladmin -S /data/mysql/mysql3308/tmp/mysql3308.sock -uroot -p shutdown

Extended

The Startup/shutdown/Login database can be made into shell files

Start

echo ‘/usr/local/mysql5.7/bin/mysqld --defaults-file=/etc/my3308.cnf &‘ > start.shchmod +x start.sh

Shut down

echo ‘/usr/local/mysql5.7/bin/mysqladmin -S /data/mysql/mysql3308/tmp/mysql3308.sock -uroot -p1234567 shutdown‘ > stop.shchmod +x stop.sh

Login

echo ‘/usr/local/mysql5.7/bin/mysql -S /data/mysql/mysql3308/tmp/mysql3308.sock -uroot -p1234567‘ > login.shchmod +x login.sh

This enables the MARIADB and MySQL to coexist on the same host.

However, after initialization, the error log records some warning messages:

2017-10-25T10:39:08.325682Z 0 [Warning] The syntax ‘--language/-l‘ is deprecated and will be removed in a future release. Please use ‘--lc-messages-dir‘ instead.
2017-10-25T10:39:08.325842Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2017-10-25T10:39:08.325937Z 0 [Warning] Using pre 5.5 semantics to load error messages from /usr/local/mysql5.7/share/english/.
2017-10-25T10:39:08.325943Z 0 [Warning] If this is not intended, refer to the documentation for valid usage of --lc-messages-dir and --language parameters.
2017-10-25T10:39:08.326404Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import‘
2017-10-25T10:39:08.326414Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import/source‘
2017-10-25T10:39:08.326478Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import‘
2017-10-25T10:39:08.326483Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import/source‘
2017-10-25T10:39:08.326547Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import‘
2017-10-25T10:39:08.326550Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import/source‘
2017-10-25T10:39:08.326713Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import‘
2017-10-25T10:39:08.326717Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import/source‘
2017-10-25T10:39:08.326784Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import‘
2017-10-25T10:39:08.326792Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import/source‘
2017-10-25T10:39:08.326839Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import‘
2017-10-25T10:39:08.326843Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import/source‘
2017-10-25T10:39:08.326895Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import‘
2017-10-25T10:39:08.326899Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import/source‘
2017-10-25T10:39:08.327097Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import‘
2017-10-25T10:39:08.327108Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import/source‘
2017-10-25T10:39:08.327175Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import‘
2017-10-25T10:39:08.327184Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import/source‘
2017-10-25T10:39:08.327373Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import‘
2017-10-25T10:39:08.327383Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import/source‘
2017-10-25T10:39:08.327432Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import‘
2017-10-25T10:39:08.327439Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import/source‘
2017-10-25T10:39:08.327566Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import‘
2017-10-25T10:39:08.327578Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import/source‘
2017-10-25T10:39:08.327673Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import‘
2017-10-25T10:39:08.327678Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import/source‘
2017-10-25T10:39:08.327762Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import‘
2017-10-25T10:39:08.327766Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import/source‘
2017-10-25T10:39:08.327820Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import‘
2017-10-25T10:39:08.327824Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import/source‘
2017-10-25T10:39:08.327870Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import‘
2017-10-25T10:39:08.327874Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import/source‘
2017-10-25T10:39:08.327968Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import‘
2017-10-25T10:39:08.327972Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import/source‘
2017-10-25T10:39:08.328017Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import‘
2017-10-25T10:39:08.328021Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import/source‘
2017-10-25T10:39:08.328082Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import‘
2017-10-25T10:39:08.328086Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import/source‘
2017-10-25T10:39:08.328152Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import‘
2017-10-25T10:39:08.328156Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import/source‘
2017-10-25T10:39:08.328216Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import‘
2017-10-25T10:39:08.328220Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import/source‘
2017-10-25T10:39:08.328291Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import‘
2017-10-25T10:39:08.328296Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import/source‘
2017-10-25T10:39:08.328341Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import‘
2017-10-25T10:39:08.328345Z 0 [Warning] Unknown LDML tag: ‘charsets/charset/collation/rules/import/source‘
 100
 100
 100
2017-10-25T10:39:08.912076Z 0 [Warning] InnoDB: New log files created, LSN=45790
2017-10-25T10:39:08.965834Z 0 [Warning] InnoDB: Creating foreign key constraint system tables.
2017-10-25T10:39:09.024512Z 0 [Warning] No existing UUID has been found, so we assume that this is the first time that this server has been started. Generating a new UUID: bb700150-b970-11e7-8e66-0050568a571f.
2017-10-25T10:39:09.025193Z 0 [Warning] Gtid table is not ready to be used. Table ‘mysql.gtid_executed‘ cannot be opened.
2017-10-25T10:39:09.026291Z 1 [Note] A temporary password is generated for [email protected]: eiq-<*>yO0k-

Mariadb and MySQL coexist