安装Docker

由于我用的是Windows10，所以我打开了Hyper-V，然后在Dcoker官网下载并安装了Docker。

CentOS 之间使用 yum install docker 安装docker然后使用systemctl start docker启动服务，systemctl enable docker开机启动docker服务。

使Docker容器和Windows10建立局域网连接

Docker创建一个局域网

docker network create --subnet=[IP]/[掩码位数] 子网名称

指令示例：

docker network create --subnet=192.168.100.0/24 homenet

在Windows10中将这个子网添加到路由表中 ，Linux重启即可

route add -p [局域网ip] mask [子网掩码] [经过网关（使用Docker默认网关）]

指令示例（管理员模式下运行指令）：

route add -p 192.168.100.0 mask 255.255.255.0 10.0.75.2

简单Mysql持久化

预先准备

先启动一个mysql，查看需要持久化的文件有哪些。

docker run -itd --net homenet --ip 192.168.100.10 --name mysql000 -e MYSQL_ROOT_PASSWORD=00000000 mysql
docker exec -it mysql000 /bin/bash
# find / -name "mysql"

然后发现了以下需要映射的文件
/etc/mysql/my.cnf
/var/lib/mysql
保存一份my.cnf文件到宿主机，挂载文件时需要用到

然后删除刚才创建的Mysql，删除前顺便测试下局域网有没有用

 mysql -h 192.168.100.10 -u root -p
 [mysql]exit
 docker stop mysql000
 docker rm mysql000

启动mysql

然后创建mysql容器，命令示例（在挂载过程中需要输入Windows10密码授权本地文件操作）：

docker run -itd --privileged=true --net homenet --ip 192.168.100.10 --name mysql000 -e MYSQL_ROOT_PASSWORD=00000000 -e MYSQL_USER="ovea" -e MYSQL_PASSWORD="00300100" -v /c/Users/OVEA/Documents/Docker/MySQL/MySQL000/etc/my.cnf:/etc/mysql/my.cnf -v /c/Users/OVEA/Documents/Docker/MySQL/MySQL000/varlib:/var/lib/mysql mysql

搭建MySQL集群

预习准备

docker pull mysql/mysql-cluster
docker run -itd --net homenet --ip 192.168.100.10 --name mysql000 -e MYSQL_ROOT_PASSWORD=00000000 mysql/mysql-cluster ndbd

然后查找需要映射的文件
/var/lib/mysql
/var/lib/mysql-files/
/var/lib/mysql-keyring/
/etc/my.cnf
/etc/mysql-cluster.cnf
最后两个文件保存一份到宿主机

docker stop mysql000
docker rm mysql000

修改配置文件

修改my.cnf [Linux下该文件权限应为644或744]

主要是manager以外的节点使用的，ip指向manager节点的IP

[mysqld]
ndbcluster
ndb-connectstring=192.168.100.10
user=mysql

[mysql_cluster]
ndb-connectstring=192.168.100.10

修改mysql-cluster.cnf [Linux下该文件权限应为644或744]

主要配置节点之间的关系和职责

# Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA

[ndbd default]
NoOfReplicas=4
DataMemory=128M
IndexMemory=16M


[ndb_mgmd]
NodeId=1
hostname=192.168.100.10
datadir=/var/lib/mysql

[ndbd]
NodeId=2
hostname=192.168.100.11
datadir=/var/lib/mysql

[ndbd]
NodeId=3
hostname=192.168.100.12
datadir=/var/lib/mysql

[ndbd]
NodeId=4
hostname=192.168.100.13
datadir=/var/lib/mysql

[mysqld]
NodeId=5
hostname=192.168.100.14

启动5个节点

Windows 指令示例

docker run -itd --privileged=true --net homenet --ip 192.168.100.10 --name mysql-mgmd-000  -v /c/Users/OVEA/Documents/Docker/MySQL/MySQL000/etc/mysql-cluster.cnf:/etc/mysql-cluster.cnf -v /c/Users/OVEA/Documents/Docker/MySQL/MySQL000/varlib:/var/lib/mysql mysql/mysql-cluster ndb_mgmd
docker run -itd --privileged=true --net homenet --ip 192.168.100.11 --name mysql-node-000  -v /c/Users/OVEA/Documents/Docker/MySQL/MySQL001/etc/my.cnf:/etc/my.cnf -v /c/Users/OVEA/Documents/Docker/MySQL/MySQL001/etc/mysql-cluster.cnf:/etc/mysql-cluster.cnf -v /c/Users/OVEA/Documents/Docker/MySQL/MySQL001/varlib:/var/lib/mysql mysql/mysql-cluster ndbd
docker run -itd --privileged=true --net homenet --ip 192.168.100.12 --name mysql-node-001  -v /c/Users/OVEA/Documents/Docker/MySQL/MySQL002/etc/my.cnf:/etc/my.cnf -v /c/Users/OVEA/Documents/Docker/MySQL/MySQL002/etc/mysql-cluster.cnf:/etc/mysql-cluster.cnf -v /c/Users/OVEA/Documents/Docker/MySQL/MySQL002/varlib:/var/lib/mysql mysql/mysql-cluster ndbd
docker run -itd --privileged=true --net homenet --ip 192.168.100.13 --name mysql-node-002  -v /c/Users/OVEA/Documents/Docker/MySQL/MySQL003/etc/my.cnf:/etc/my.cnf -v /c/Users/OVEA/Documents/Docker/MySQL/MySQL003/etc/mysql-cluster.cnf:/etc/mysql-cluster.cnf -v /c/Users/OVEA/Documents/Docker/MySQL/MySQL003/varlib:/var/lib/mysql mysql/mysql-cluster ndbd
docker run -itd --privileged=true --net homenet --ip 192.168.100.14 --name mysql000  -v /c/Users/OVEA/Documents/Docker/MySQL/MySQL004/etc/my.cnf:/etc/my.cnf  -v /c/Users/OVEA/Documents/Docker/MySQL/MySQL004/varlib:/var/lib/mysql -e MYSQL_RANDOM_ROOT_PASSWORD=true mysql/mysql-cluster mysqld

Linux命令示例：

docker run -itd --privileged=true --net homenet --ip 192.168.100.10 --name mysql-mgmd-000  -v /home/ovea/Documents/Docker/MySQL/MySQL000/etc/mysql-cluster.cnf:/etc/mysql-cluster.cnf -v /home/ovea/Documents/Docker/MySQL/MySQL000/varlib:/var/lib/mysql mysql/mysql-cluster ndb_mgmd
docker run -itd --privileged=true --net homenet --ip 192.168.100.11 --name mysql-node-000  -v /home/ovea/Documents/Docker/MySQL/MySQL001/etc/my.cnf:/etc/my.cnf -v /home/ovea/Documents/Docker/MySQL/MySQL001/etc/mysql-cluster.cnf:/etc/mysql-cluster.cnf -v /home/ovea/Documents/Docker/MySQL/MySQL001/varlib:/var/lib/mysql mysql/mysql-cluster ndbd
docker run -itd --privileged=true --net homenet --ip 192.168.100.12 --name mysql-node-001  -v /home/ovea/Documents/Docker/MySQL/MySQL002/etc/my.cnf:/etc/my.cnf -v /home/ovea/Documents/Docker/MySQL/MySQL002/etc/mysql-cluster.cnf:/etc/mysql-cluster.cnf -v /home/ovea/Documents/Docker/MySQL/MySQL002/varlib:/var/lib/mysql mysql/mysql-cluster ndbd
docker run -itd --privileged=true --net homenet --ip 192.168.100.13 --name mysql-node-002  -v /home/ovea/Documents/Docker/MySQL/MySQL003/etc/my.cnf:/etc/my.cnf -v /home/ovea/Documents/Docker/MySQL/MySQL003/etc/mysql-cluster.cnf:/etc/mysql-cluster.cnf -v /home/ovea/Documents/Docker/MySQL/MySQL003/varlib:/var/lib/mysql mysql/mysql-cluster ndbd
docker run -itd --privileged=true --net homenet --ip 192.168.100.14 --name mysql000  -v /home/ovea/Documents/Docker/MySQL/MySQL004/etc/my.cnf:/etc/my.cnf  -v /home/ovea/Documents/Docker/MySQL/MySQL004/varlib:/var/lib/mysql -e MYSQL_RANDOM_ROOT_PASSWORD=true mysql/mysql-cluster mysqld

必须一次启动成功，否则将会导致无法正确运行！启动完前一个节点再启动下一个节点。
结果：


在日志中找到密码然后登录

docker logs mysql000
docker exec mysql000 /bin/bash
# mysql -u root -p

需要把-v挂载除配置文件外的其他选项（持久化集群）都取消掉才能正常打开mysqld服务，原因不明……而且错误也没有写入日志中!

解决方案，先停止所有容器，然后全部启动。(虽然这样是启动了，但是密码就不知道了)
Windows10

docker stop $(docker ps -q)
docker start $(docker ps -a -q)

Linux

sudo docker stop $(sudo docker ps -q)
sudo docker start $(sudo docker ps -a -q)

参考资料

https://www.jianshu.com/p/cc837360c9e7