Corosync+pacemaker+DRBD+mysql(mariadb)实现高可用(ha)的mysql集群(centos7)

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Corosync+pacemaker+DRBD+mysql(mariadb)实现高可用(ha)的mysql集群(centos7)

目录:

  • 介绍环境

  • 借助pcs安装与配置corosync和pacemaker(pcs只是一个管理工具)

  • DRBD安装配置参考之前的博客《DRBD-MYSQL分布式块设备实现高可用》http://legehappy.blog.51cto.com/13251607/1975804

  • Mysql安装和配置

  • Crmsh安装和资源管理


据说这种Corosync+pacemaker+DRBD+mysql(mariadb)的架构可以达到99.99%,就是说这种架构非常的稳定,所以觉得还是需要了解一下的。

先给大家介绍一下高可用的衡量标准:高可用性集群可以通过系统可靠性(reliability)和可维护性(maintainablilty)来度量的,工程上,通常使用平均故障时间(MTTF)来度量系统的可靠性,用平均维修时间(MTTR)来度量系统的可维护性。于是可靠性被定义为:HA=MTTF/(MTTF+MTTR)*100% 具体HA衡量标准:

99%---一年宕机时间不超过4天

99,.9%---一年宕机时间不超过10小时

99.99%---一年宕机时间不超过1小时

99.999%---一年宕机时间不超过6分钟

环境:

[[email protected] ~]# cat /etc/redhat-release

CentOS Linux release 7.2.1511 (Core)

[[email protected] ~]# cat /etc/redhat-release

CentOS Linux release 7.2.1511 (Core)

cml1:serve ip:192.168.5.101r vip:192.168.5.250

cml2:server ip:192.168.5.102 vip:192.168.5.250

cml3:client ip:192.168.5.104

 

 

技术分享

二、借助pcs安装与配置corosync和pacemaker(pcs只是一个管理工具)

配置集群的前提:

(1)时间同步

[[email protected]~]# ntpdate cn.pool.ntp.org

[[email protected]~]# ntpdate cn.pool.ntp.org

(2)主机名互相访问

[[email protected]~]# ssh-keygen

[[email protected]~]# ssh-copy-id cml2

[[email protected]~]# hostname

cml1

[[email protected]~]# cat /etc/hosts

192.168.5.101 cml1

192.168.5.102 cml2

192.168.5.104 cml3

(3)是否使用仲裁设备。

Centos7上面不需要使用

 

生命周期管理工具:

Pcs:agent(pcsd)

Crash:pssh

 

1、在两节点上执行:

[[email protected] ~]# yum install -y pacemaker pcspsmisc policycoreutils-python

 

2、两节点上启动pcs并且开机启动:

[[email protected] ~]# systemctl start pcsd.service
[[email protected] ~]# systemctl enable pcsd.service

 

3、两节点上修改用户hacluster的密码(用户已经固定不可以改变)

[[email protected] ~]# echo redhat | passwd --stdin hacluster

 

4、注册pcs集群主机(默认注册使用用户名hacluster,和密码):

[[email protected] corosync]# pcs cluster auth cml1 cml2    ##设置注册那个集群节点
cml1: Already authorized
cml2: Already authorized

 

5、在集群上注册两台集群:

[[email protected] corosync]# pcs cluster setup--name mycluster cml1 cml2 --force。  ##设置集群

 

6、接下来就在某个节点上已经生成来corosync配置文件:

[[email protected] corosync]# ls

corosync.conf  corosync.conf.example  corosync.conf.example.udpu  corosync.xml.example  uidgid.d

#我们看到生成来corosync.conf配置文件:

 

7、我们看一下注册进来的文件:

[[email protected] corosync]# cat corosync.conf
totem {
   version: 2
   secauth: off
   cluster_name: webcluster
   transport: udpu
}
 
nodelist {
   node {
       ring0_addr: cml1
       nodeid: 1
    }
 
   node {
       ring0_addr: cml2
       nodeid: 2
    }
}
 
quorum {
   provider: corosync_votequorum
   two_node: 1
}
 
logging {
   to_logfile: yes
   logfile: /var/log/cluster/corosync.log
   to_syslog: yes
}

 

8、启动集群:

[[email protected] corosync]# pcs cluster start--all
cml1: Starting Cluster...
cml2: Starting Cluster...
##相当于启动来pacemaker和corosync:
[[email protected] corosync]# ps -ef | grepcorosync
root     57490      1  1 21:47 ?        00:00:52 corosync
root     75893  51813  0 23:12 pts/0    00:00:00 grep --color=auto corosync
[[email protected] corosync]# ps -ef | greppacemaker
root     57502      1  0 21:47 ?        00:00:00 /usr/sbin/pacemakerd -f
haclust+ 57503  57502  0 21:47 ?        00:00:03 /usr/libexec/pacemaker/cib
root     57504  57502  0 21:47 ?        00:00:00/usr/libexec/pacemaker/stonithd
root     57505  57502  0 21:47 ?        00:00:01 /usr/libexec/pacemaker/lrmd
haclust+ 57506  57502  0 21:47 ?        00:00:01 /usr/libexec/pacemaker/attrd
haclust+ 57507  57502  0 21:47 ?        00:00:00 /usr/libexec/pacemaker/pengine
haclust+ 57508  57502  0 21:47 ?        00:00:01 /usr/libexec/pacemaker/crmd
root     75938  51813  0 23:12 pts/0    00:00:00 grep --color=auto pacemaker

 

8、查看集群的状态(显示为no faults就是ok)

[[email protected] corosync]# corosync-cfgtool -s
Printing ring status.
Local node ID 1
RING ID 0
       id    = 192.168.5.101
       status     = ring 0 active with no faults
[[email protected] corosync]# ssh cml2corosync-cfgtool -s
Printing ring status.
Local node ID 2
RING ID 0
       id    = 192.168.5.102
       status     = ring 0 active with no faults

 

10、可以查看集群是否有错:

[[email protected] corosync]# crm_verify -L -V
  error: unpack_resources:     Resourcestart-up disabled since no STONITH resources have been defined
  error: unpack_resources:    Either configure some or disable STONITH with the stonith-enabled option
  error: unpack_resources:     NOTE:Clusters with shared data need STONITH to ensure data integrity
Errors found during check: config not valid

 

##因为我们没有配置STONITH设备,所以我们下面要关闭

 

11、关闭STONITH设备:

[[email protected] corosync]# pcs property setstonith-enabled=false
[[email protected] corosync]# crm_verify -L -V
[[email protected] corosync]# pcs property list
Cluster Properties:
 cluster-infrastructure: corosync
 cluster-name: mycluster
 dc-version: 1.1.16-12.el7_4.2-94ff4df
 have-watchdog: false
 stonith-enabled: false

三、DRBD安装配置

参考之前的博客《DRBD-MYSQL分布式块设备实现高可用》http://legehappy.blog.51cto.com/13251607/1975804

 

四、Mysql安装和配置

##这里我是使用yum直接安装的,如果使用编译安装也是一样的但是就要在

[

[email protected] ~]# cd /etc/systemd/system
[[email protected] system]# cat mariadb.service
[Unit]
Description=mariadb
After=network.target
 
[Service]
Type=forking
ExecStart=/usr/local/mysql/sbin/mysql
ExecReload=/usr/local/mysql/sbin/mysql -sreload
ExecStop=/usr/local/mysql/sbin/mysql -squit
PrivateTmp=true
 
[Install]
WantedBy=multi-user.target

 

1、两节点上面安装:

[[email protected] ~]# yum install mariadb-servermariadb -y

 

2、在/etc/my.cnf文件中修改mysql数据库存放目录为/data

[[email protected] ~]# cat /etc/my.cnf
[mysqld]
datadir=/data
socket=/var/lib/mysql/mysql.sock
# Disabling symbolic-links is recommendedto prevent assorted security risks
symbolic-links=0
# Settings user and group are ignored whensystemd is used.
# If you need to run mysqld under adifferent user or group,
# customize your systemd unit file formariadb according to the
# instructions inhttp://fedoraproject.org/wiki/Systemd
 
[mysqld_safe]
log-error=/var/log/mariadb/mariadb.log
pid-file=/var/run/mariadb/mariadb.pid
 
#
# include all files from the configdirectory
#
!includedir /etc/my.cnf.d

##先不要启动因为后面直接使用crm配置启动。

 

五、Crmsh安装和资源管理

1、安装crmsh:

集群我们可以下载安装crmsh来操作(从github来下载,然后解压直接安装):只在一个节点安装即可。(但最好选择两节点上安装这样测试时方便点)

[[email protected] ~]# cd /usr/local/src/
[[email protected] src]# ls
nginx-1.12.0         php-5.5.38.tar.gz
crmsh-2.3.2.tar  nginx-1.12.0.tar.gz  zabbix-3.2.7.tar.gz
[[email protected] src]# tar -xf crmsh-2.3.2.tar
[[email protected] crmsh-2.3.2]# python setup.pyinstall

 

2、用crmsh来管理:

[[email protected] ~]# crm help

Help overview for crmsh

 

 

Available topics:

 

       Overview       Help overview forcrmsh

 

       Topics         Available topics

 

       Description    Program description

       CommandLine    Command lineoptions

       Introduction   Introduction

       Interface      User interface

       Completion     Tab completion

       Shorthand      Shorthand syntax

       Features       Features

       Shadows        Shadow CIB usage

       Checks         Configurationsemantic checks

       Templates      Configurationtemplates

       Testing        Resource testing

       Security       Access ControlLists (ACL)

       Resourcesets   Syntax: Resourcesets

       AttributeListReferences Syntax: Attribute list references

       AttributeReferences Syntax: Attribute references

       RuleExpressions Syntax: Rule expressions

       Lifetime       Lifetime parameterformat

       Reference      Command reference

 

3、借助crmsh配置mysql高可用

[[email protected] ~]# crm
crm(live)# status
Stack: corosync
Current DC: cml2 (version1.1.16-12.el7_4.4-94ff4df) - partition with quorum
Last updated: Wed Oct 25 09:22:31 2017
Last change: Wed Oct 25 09:22:19 2017 byroot via cibadmin on cml1
 
2 nodes configured
0 resources configured
 
Online: [ cml1 cml2 ]
 
No resources
 
##配置之前最好检查服务没有启动
[[email protected] ~]# systemctl stop mariadb
[[email protected] ~]# umount /dev/drbd1
[[email protected] ~]# systemctl stop drbd
[[email protected] ~]# systemctl enable mariadb  ####需要设置开机启动在下面配置systemd:mariadb时才会出现。

(1)增加DRBD资源:

[[email protected] data]# crm
crm(live)# configure
crm(live)configure# propertystonith-enabled=false
crm(live)configure# propertyno-quorum-policy=ignore
crm(live)configure#  property migration-limit=1
crm(live)configure#  verify
crm(live)configure# primitive mysqldrbdocf:linbit:drbd params drbd_resource=mysql op start timeout=240 op stoptimeout=100 op monitor role=Master interval=20 timeout=30 op monitor role=Slaveinterval=30 timeout=30
crm(live)configure# ms ms_mysqldrbdmysqldrbd meta master-max=1 master-node-max=1 clone-max=2 clone-node-max=1notify=true
crm(live)configure# verify
crm(live)configure# show
node 1: cml1
node 2: cml2
primitive mysqldrbd ocf:linbit:drbd        params drbd_resource=mysql        op start timeout=240 interval=0        op stop timeout=100 interval=0        op monitor role=Master interval=20 timeout=30        op monitor role=Slave interval=30 timeout=30
ms ms_mysqldrbd mysqldrbd        meta master-max=1 master-node-max=1 clone-max=2 clone-node-max=1notify=true
property cib-bootstrap-options:        have-watchdog=false        dc-version=1.1.16-12.el7_4.2-94ff4df        cluster-infrastructure=corosync        cluster-name=mycluster        stonith-enabled=false        no-quorum-policy=ignore
       property migration-limit=1
crm(live)configure# commit

(2)增加文件系统资源:

crm(live)configure#  primitive mystore ocf:heartbeat:Filesystemparams device=/dev/drbd1 directory=/data fstype=ext4 op start timeout=60 opstop timeout=60        
crm(live)configure# verify

(3)给文件系统类型和drbd做亲缘性绑定(inf为证书为接近,当位负数时候为分离)。

crm(live)configure# colocationmystore_with_ms_mysqldrbd inf: mystore ms_mysqldrbd:Master
crm(live)configure# verify

(4)做顺序约束,当drbd起来之后才对文件系统进行绑定:

crm(live)configure# ordermystore_after_ms_mysqldrbd mandatory: ms_mysqldrbd:promote mystore:start 
crm(live)configure# verify
crm(live)configure# commit

 

(5)查看一下资源当前的配置:

crm(live)# status
Stack: corosync
Current DC: cml1 (version1.1.16-12.el7_4.2-94ff4df) - partition with quorum
Last updated: Sun Oct 22 14:18:52 2017
Last change: Sun Oct 22 14:18:05 2017 byroot via cibadmin on cml1
 
2 nodes configured
3 resources configured
 
Online: [ cml1 cml2 ]
 
Full list of resources:
 
 Master/Slave Set: ms_mysqldrbd [mysqldrbd]
    Masters: [ cml1 ]
    Slaves: [ cml2 ]
 mystore       (ocf::heartbeat:Filesystem):   Started cml1

 

##查看当前配置:

crm(live)configure# show
node 1: cml1
node 2: cml2
primitive mysqldrbd ocf:linbit:drbd        params drbd_resource=mysql        op start timeout=240 interval=0        op stop timeout=100 interval=0        op monitor role=Master interval=20 timeout=30        op monitor role=Slave interval=30 timeout=30
primitive mystore Filesystem        params device="/dev/drbd1" directory="/data"fstype=xfs        op start timeout=60 interval=0        op stop timeout=60 interval=0
ms ms_mysqldrbd mysqldrbd        meta master-max=1 master-node-max=1 clone-max=2 clone-node-max=1 notify=true
order mystore_after_ms_mysqldrbd Mandatory:ms_mysqldrbd:promote mystore:start
colocation mystore_with_ms_mysqldrbd inf:mystore ms_mysqldrbd:Master
property cib-bootstrap-options:        have-watchdog=false        dc-version=1.1.16-12.el7_4.2-94ff4df        cluster-infrastructure=corosync        cluster-name=mycluster        stonith-enabled=false        no-quorum-policy=ignore
       property migration-limit=1

 

##查看下cml1你应该会发现已经挂载了/data目录:

[[email protected] ~]# df -h
Filesystem           Size Used Avail Use% Mounted on
/dev/mapper/cl-root   17G 9.0G  8.1G  53% /
devtmpfs             588M     0 588M   0% /dev
tmpfs                599M   39M 560M   7% /dev/shm
tmpfs                599M  8.1M 591M   2% /run
tmpfs                599M     0 599M   0% /sys/fs/cgroup
/dev/sda1           1014M  168M 847M  17% /boot
tmpfs                120M     0 120M   0% /run/user/0
/dev/drbd1           5.0G   62M 5.0G   2% /data

 

(6)接下来增加一下mysql资源,并作亲缘性绑定:

crm(live)configure# primitive mysqldsystemd:mariadb op start timeout=100 op stop timeout=100
 
crm(live)configure# primitive mysqldsystemd:mariadb
crm(live)configure# colocationmysqld_with_mystore inf: mysqld mystore 
crm(live)configure# verify

(7)提交并且查看:

crm(live)configure# commit
crm(live)configure# show
node 1: cml1
node 2: cml2
primitive mysqld systemd:mariadb        op start timeout=100 interval=0        op stop timeout=100 interval=0
primitive mysqldrbd ocf:linbit:drbd        params drbd_resource=mysql        op start timeout=240 interval=0        op stop timeout=100 interval=0        op monitor role=Master interval=20 timeout=30        op monitor role=Slave interval=30 timeout=30
primitive mystore Filesystem        params device="/dev/drbd1" directory="/data"fstype=xfs        op start timeout=60 interval=0        op stop timeout=60 interval=0
ms ms_mysqldrbd mysqldrbd        meta master-max=1 master-node-max=1 clone-max=2 clone-node-max=1notify=true
colocation mysqld_with_mystore inf: mysqld mystore
order mystore_after_ms_mysqldrbd Mandatory:ms_mysqldrbd:promote mystore:start
colocation mystore_with_ms_mysqldrbd inf:mystore ms_mysqldrbd:Master
property cib-bootstrap-options:        have-watchdog=false        dc-version=1.1.16-12.el7_4.2-94ff4df        cluster-infrastructure=corosync        cluster-name=mycluster        stonith-enabled=false        no-quorum-policy=ignore
       property migration-limit=1

(8)作顺序约束,先挂载文件系统,然后在启动msyqld资源:

 

crm(live)configure# ordermysqld_after_mystore mandatory: mystore mysqld
crm(live)configure# verify
crm(live)configure# show
node 1: cml1
node 2: cml2
primitive mysqld systemd:mariadb        op start timeout=100 interval=0        op stop timeout=100 interval=0
primitive mysqldrbd ocf:linbit:drbd        params drbd_resource=mysql        op start timeout=240 interval=0        op stop timeout=100 interval=0        op monitor role=Master interval=20 timeout=30        op monitor role=Slave interval=30 timeout=30
primitive mystore Filesystem        params device="/dev/drbd1" directory="/data"fstype=xfs        op start timeout=60 interval=0        op stop timeout=60 interval=0
ms ms_mysqldrbd mysqldrbd         meta master-max=1 master-node-max=1clone-max=2 clone-node-max=1 notify=true
order mysqld_after_mystore Mandatory:mystore mysqld
colocation mysqld_with_mystore inf: mysqldmystore
order mystore_after_ms_mysqldrbd Mandatory:ms_mysqldrbd:promote mystore:start
colocation mystore_with_ms_mysqldrbd inf:mystore ms_mysqldrbd:Master
property cib-bootstrap-options:        have-watchdog=false        dc-version=1.1.16-12.el7_4.2-94ff4df        cluster-infrastructure=corosync        cluster-name=mycluster        stonith-enabled=false        no-quorum-policy=ignore
       property migration-limit=1
crm(live)configure# commit

 

(9)检测资源,并且看一下node2的mysql是否已经启动:

crm(live)# status
Stack: corosync
Current DC: cml1 (version1.1.16-12.el7_4.4-94ff4df) - partition with quorum
Last updated: Wed Oct 25 23:45:57 2017
Last change: Wed Oct 25 23:36:20 2017 byroot via crm_attribute on cml1
 
2 nodes configured
5 resources configured
 
Online: [ cml1 cml2 ]
 
Full list of resources:
 
 Master/Slave Set: ms_mysqldrbd [mysqldrbd]
    Masters: [ cml1 ]
    Slaves: [ cml2 ]
 mystore (ocf::heartbeat:Filesystem):  Started cml1
 mysqld (systemd:mariadb):      Started cml1
 myvip   (ocf::heartbeat:IPaddr): Started cml1
 
####我们看到mysql已经启动了:

 

(10)增加VIP资源,作虚拟IP调度:

crm(live)# configure
crm(live)configure# primitive myvipocf:heartbeat:IPaddr params ip="192.168.5.200" op monitor interval=20timeout=20 on-fail=restart
crm(live)configure#  colocation vip_with_ms_mysqldrbd inf:ms_mysqldrbd:Master myvip
crm(live)configure# verify
crm(live)configure# commit
crm(live)configure# show
node 1: cml1        attributesstandby=off
node 2: cml2        attributesstandby=off
primitive mysqld systemd:mariadb        opstart timeout=100 interval=0        opstop timeout=100 interval=0
primitive mysqldrbd ocf:linbit:drbd        paramsdrbd_resource=mysql        opstart timeout=240 interval=0        opstop timeout=100 interval=0        opmonitor role=Master interval=20 timeout=30        opmonitor role=Slave interval=30 timeout=30
primitive mystore Filesystem        paramsdevice="/dev/drbd1" directory="/data" fstype=ext4        opstart timeout=60 interval=0        opstop timeout=60 interval=0
primitive myvip IPaddr        paramsip=192.168.5.250        opmonitor interval=20 timeout=20 on-fail=restart
ms ms_mysqldrbd mysqldrbd        metamaster-max=1 master-node-max=1 clone-max=2 clone-node-max=1 notify=true
order mysqld_after_mystone Mandatory:mystore mysqld
colocation mysqld_with_mystone inf: mysqldmystore
order mystone_after_ms_mysqldrbd Mandatory:ms_mysqldrbd:promote mystore:start
colocation mystore_with_ms_mysqldrbd inf:mystore ms_mysqldrbd:Master
colocation vip_with_ms_mysqldrbd inf:ms_mysqldrbd:Master myvip
property cib-bootstrap-options:        have-watchdog=false       dc-version=1.1.16-12.el7_4.4-94ff4df       cluster-infrastructure=corosync       cluster-name=webcluster       stonith-enabled=false       no-quorum-policy=ignore
       property migration-limit=1

六、测试:

最后所有的工作都完成之后,我们测试一下vip:

[[email protected] ~]# df -TH

Filesystem              Type      Size Used Avail Use% Mounted on

/dev/mapper/centos-root xfs        19G 6.8G   13G  36% /

devtmpfs                devtmpfs  501M    0  501M   0% /dev

tmpfs                   tmpfs     512M 143M  370M  28% /dev/shm

tmpfs                   tmpfs     512M  20M  493M   4% /run

tmpfs                   tmpfs     512M    0  512M   0% /sys/fs/cgroup

/dev/sda1               xfs       521M 161M  361M  31% /boot

tmpfs                   tmpfs     103M    0  103M   0% /run/user/0

/dev/drbd1              ext4       11G  69M  9.9G   1% /data

[[email protected] ~]# mysql

Welcome to the MariaDB monitor.  Commands end with ; or \g.

Your MariaDB connection id is 2

Server version: 5.5.56-MariaDB MariaDBServer

 

Copyright (c) 2000, 2017, Oracle, MariaDBCorporation Ab and others.

 

Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ toclear the current input statement.

 

MariaDB [(none)]> show databases;

+---------------------+

| Database            |

+---------------------+

| information_schema  |

| cml                 |

| cml2                |

| cmltest             |

| #mysql50#lost+found |

| mysql               |

| performance_schema  |

| test                |

| testcml             |

+---------------------+

9 rows in set (0.01 sec)

 

###现在操作是授权

 

MariaDB [(none)]> GRANT ALL ON *.* TO‘root‘@‘%‘ IDENTIFIED BY ‘123456‘;

Query OK, 0 rows affected (0.02 sec)

 

MariaDB [(none)]> FLUSH PRIVILEGES;

Query OK, 0 rows affected (0.00 sec)

 

###使用客户端访问vip:

[[email protected] ~]# mysql -uroot -p123456 -h192.168.5.250

Welcome to the MariaDB monitor.  Commands end with ; or \g.

Your MariaDB connection id is 3

Server version: 5.5.56-MariaDB MariaDBServer

 

Copyright (c) 2000, 2017, Oracle, MariaDBCorporation Ab and others.

 

Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ toclear the current input statement.

 

MariaDB [(none)]> show databases;

+---------------------+

| Database            |

+---------------------+

| information_schema  |

| cml                 |

| cml2                |

| cmltest             |

| #mysql50#lost+found |

| mysql               |

| performance_schema  |

| test                |

| testcml             |

+---------------------+

9 rows in set (0.00 sec)

###下面我们把cml1设置为standby,然后在cml2访问:

crm(live)#node standby

crm(live)#status

Stack:corosync

CurrentDC: cml1(version 1.1.16-12.el7_4.2-94ff4df) - partition with quorum

Lastupdated: Sun Oct 22 14:54:14 2017

Lastchange: Sun Oct 22 14:54:02 2017 by root via crm_attribute on cml1

 

2 nodesconfigured

5resources configured

 

Node cml1:standby

Online:[ cml2 ]

 

Fulllist of resources:

 

 Master/Slave Set: ms_mysqldrbd [mysqldrbd]

     Masters: [ cml2 ]

     Stopped: [ cml1 ]

 mystore       (ocf::heartbeat:Filesystem):   Started cml2

 mysqld (systemd:mariadb):      Started cml2

 myvip (ocf::heartbeat:IPaddr):       Started cml2

 

###在cml2上面访问(我们发现vip已经漂移过来,数据也漂移了过来):

[[email protected]~]# mysql -uroot -p123456 -h 192.168.5.250

Welcometo the MariaDB monitor.  Commands endwith ; or \g.

YourMariaDB connection id is 3

Serverversion: 5.5.56-MariaDB MariaDB Server

 

Copyright(c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.

 

Type‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement.

 

MariaDB[(none)]> show databases;

+---------------------+

|Database            |

+---------------------+

|information_schema  |

|cml                 |

|cml2                |

|cmltest             |

|#mysql50#lost+found |

|mysql               |

|performance_schema  |

|test                |

|testcml             |

+---------------------+

9 rowsin set (0.00 sec)


本文出自 “第一个legehappy51cto博客” 博客,请务必保留此出处http://legehappy.blog.51cto.com/13251607/1976251

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