galera集群

一、环境准备

1、各主机配置静态域名解析：

cat /etc/hosts

127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4

::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

192.168.210.131 node1 node1.test.com

192.168.210.130 node2 node2.test.com

192.168.210.132 node3 node3.test.com

 

2、并配置各节点ssh无密钥登陆

 

3、安装docker环境

wget http://download2.yunwei.edu/shell/docker.tar.gz

tar zxf  docker.tar.gz

cd docker

sh docker

 

4、下载配置文件并且导入镜像

wget http://download2.yunwei.edu/shell/galera.tar.gz

tar zxf  galera.tar.gz

docker load -i mariadb-galera.tar

mkdir mkdir /opt/mariadb

#######将config.tar.gz 解压后，mv到mkdir /opt/mariadb，

tar zxf config.tar.gz && mv config /opt/mariadb/

 

二、配置集群

#######node1

docker run -d --net host --name galera1 \

-e WSREP_NODE_ADDRESS=192.168.210.131 \

-e WSREP_CLUSTER_ADDRESS=gcomm://192.168.210.131:4567,192.168.210.130:4567,192.168.210.132:4567 \

-p 3306:3306 \

-p 4567:4567/udp \

-p 4567-4568:4567-4568 \

-p 4444:4444 \

-v /opt/mariadb/config/mysql:/etc/mysql \

-v /opt/mariadb/config/data:/var/lib/mysql:Z \

--restart=always \

panubo/mariadb-galera mysqld

 

#######node2

docker run -d --net host --name galera2 \

-e WSREP_NODE_ADDRESS=192.168.210.130 \

-e WSREP_CLUSTER_ADDRESS=gcomm://192.168.210.131:4567,192.168.210.130:4567,192.168.210.132:4567 \

-p 3306:3306 \

-p 4567:4567/udp \

-p 4567-4568:4567-4568 \

-p 4444:4444 \

-v /opt/mariadb/config/mysql:/etc/mysql \

-v /opt/mariadb/config/data:/var/lib/mysql:Z \

--restart=always \

panubo/mariadb-galera mysqld

 

#########node3

docker run -d --net host --name galera3 \

-e WSREP_NODE_ADDRESS=192.168.210.132 \

-e WSREP_CLUSTER_ADDRESS=gcomm://192.168.210.131:4567,192.168.210.130:4567,192.168.210.132:4567 \

-e MYSQL_ROOT_PASSWORD=123 \

-p 3306:3306 \

-p 4567:4567/udp \

-p 4567-4568:4567-4568 \

-p 4444:4444 \

-v /opt/mariadb/config/mysql:/etc/mysql \

-v /opt/mariadb/config/data:/var/lib/mysql:Z \

--restart=always \

panubo/mariadb-galera mysqld --wsrep-new-cluster

 

 

三、登陆数据库时，安装mariadb客户端

yum install mariadb -y

mysql -h 192.168.210.131 -P 3306 -u root -p123

 

检查集群状态：

SHOW STATUS LIKE 'wsrep_cluster_size';

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

| Variable_name      | Value |

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

| wsrep_cluster_size | 3     |

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

 

 

四、故障恢复：

（1）集群中某slave节点down机，重启该节点后，重启docke容器即可；

（2）集群中master节点down机，重启该master节点后，master-docker容器不能正常启动，因为这是master节点已经切换，

         需要将原先master-docker容器删除，再以非wrsep方式启动一个普通容器；

（3）集群全部意外down机，强制找一台节点作为master节点；到如下路径，将 safe_to_bootstrap: 0修改为1（平时集群正常时，每个节点都为0）

[root@con3 data]# pwd

/opt/mariadb/data

[root@con3 data]# cat grastate.dat

# GALERA saved state

version: 2.1

uuid:    6a26abec-e7b5-11e8-b15b-b74046986de4

seqno:   -1

safe_to_bootstrap: 0

 

之后在该节点启动wsrep进程的docker