open stack--galera cluster

1、環境準備

一、各主機配置靜態域名解析：

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

 

二、並配置各節點ssh無密鑰登錄

 

三、安裝docker環境

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

tar zxf  docker.tar.gz

cd docker

sh docker

 

四、下載配置文件而且導入鏡像

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

tar zxf  galera.tar.gz

docker load -i mariadb-galera.tar

mkdir mkdir /opt/mariadb

#######將config.tar.gz 解壓後，mv到mkdir /opt/mariadb，

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

 

2、配置集羣

#######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

 

 

3、登錄數據庫時，安裝mariadb客戶端

yum install mariadb -y

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

 

檢查集羣狀態：

SHOW STATUS LIKE 'wsrep_cluster_size';

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

| Variable_name      | Value |

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

| wsrep_cluster_size | 3     |

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

 

 

4、故障恢復：

（1）集羣中某slave節點down機，重啓該節點後，重啓docke容器便可；

（2）集羣中master節點down機，重啓該master節點後，master-docker容器不能正常啓動，由於這是master節點已經切換，

         須要將原先master-docker容器刪除，再以非wrsep方式啓動一個普通容器；

（3）集羣所有意外down機，強制找一臺節點做爲master節點；到以下路徑，將 safe_to_bootstrap: 0修改成1（平時集羣正常時，每一個節點都爲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

 

以後在該節點啓動wsrep進程的docker