1. 装置MySQL
体系: Ubuntu 16.04LTS (xenial)
版本: Percorna Server 5.7.21-20
装置: 官网教程
2. mysqld_multi设置文件
新建一个文件 /etc/mysql/multi_server.cnf
[mysqld_multi]
# 假如MySQL效劳不是经由历程mysqld_safe启动的,这个要解释掉
#mysqld = /usr/bin/mysqld_safe
mysqladmin = /usr/bin/mysqladmin
user = multi_admin
password = 123456
[mysqld1]
user = mysql
pid-file = /var/run/mysqld/mysqld.pid
socket = /var/run/mysqld/mysqld.sock
port = 3306
basedir = /usr
datadir = /var/lib/mysql
tmpdir = /tmp
[mysqld2]
user = mysql
pid-file=/var/run/mysqld/mysql.pid2
socket=/var/run/mysqld/mysqld.sock2
port = 3307
basedir = /usr
datadir = /var/lib/mysql2
3. 启动效劳
检察实例运转
mysqld_multi --defaults-file=/etc/mysql/multi_server.cnf report
启动效劳
mysqld_multi --defaults-file=/etc/mysql/multi_server.cnf start
由于平常状况,第一个已经是我们装置好,而且root用户也设置好的,所以不太能够出题目.
mysql2能够涌现的题目:
FATAL ERROR: Tried to start mysqld under group [mysqld2], but no data directory was found or could be created. data directory used: /var/lib/mysql2
MySQL5.7 新增实例的敕令行以下
mysqld --datadir=/var/lib/mysql2 --initialize --initialize-insecure ...
官网链接
再看/usr/bin/mysqld_multi 剧本343行高低
print "\n\nInstalling new database in $datadir\n\n";
$install_cmd="/usr/bin/mysqld ";
$install_cmd.="--initialize ";
$install_cmd.="--user=mysql ";
$install_cmd.="--datadir=$datadir";
咋一看彷佛没什么题目,实际上,用敕令行实行
which mysqld 获得的效果 /usr/sbin/mysqld
所以把这个剧本修正以后,就可以一般启动了.
固然,假如还不可的话,能够要考虑一下用户权限题目
假如运用Ubuntu的话,能够还要检察是不是apparmor的权限限定
接上面,假如就这样启动的话,mysql2 实例会随机给root用户建一个随机暗码,致使后续客户端没法登录该实例.假如须要找回暗码,只能经由历程error_log
这时候,一样须要修正剧本,在剧本中加上参数"--initialize-insecure",注重参数间的空格.
竖立衔接以后,再实行
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'new_password';
4. 后续操纵
给root用户加权限
GRANT ALL PRIVILEGES ON . TO root@'%' IDENTIFIED BY "123456";
flush privileges;
在各个实例给mysqld_multi治理用户multi_admin 加上shutdown权限
GRANT SHUTDOWN ON . TO multi_admin@localhost IDENTIFIED BY 'password';
假如经由历程mysqld_multi stop 没法有用封闭实例,能够经由历程mysqladmin 直接shutdown
后续假如由于操纵不当致使实例没法启动,能够经由历程敕令检察毛病日记
tail -30 /var/log/mysql/error.log
常见题目
2018-02-22T02:02:28.227868Z 0 [ERROR] /usr/sbin/mysqld: Can't create/write to file '/var/run/mysqld/mysql.pid3' (Errcode: 13 - Permission denied)
2018-02-22T02:02:28.227889Z 0 [ERROR] Can't start server: can't create PID file: Permission denied
这时候,能够看到/var/run/mysqld 文件夹以下,把文件都删除,再重启一下就可以够了
-rw-r--r-- 1 root root 0 Feb 22 02:01 mysqld.pid
-rw-r--r-- 1 root root 0 Feb 21 15:35 mysqld.pid2
srwxrwxrwx 1 mysql mysql 0 Feb 22 02:02 mysqld.sock=
srwxrwxrwx 1 mysql mysql 0 Feb 22 02:02 mysqld.sock2=
-rw------- 1 mysql mysql 6 Feb 22 02:02 mysqld.sock2.lock
srwxrwxrwx 1 mysql mysql 0 Feb 22 02:02 mysqld.sock3=
-rw------- 1 mysql mysql 6 Feb 22 02:02 mysqld.sock3.lock
-rw------- 1 mysql mysql 6 Feb 22 02:02 mysqld.sock.lock
-rw-r--r-- 1 root root 0 Feb 22 02:01 mysql.pid2
-rw-r--r-- 1 root root 0 Feb 22 02:01 mysql.pid3
相干引荐：
MySQL单机多实例计划布置
MySQL单机多实例设置
LBOMP – MySQL单机备份监控东西
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