ansible-galera集群部署（13）

一、环境准备

1、各主机配置静态域名解析：

[root@node1 ~]# cat /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::         localhost localhost.localdomain localhost6 localhost6.localdomain6
172.16.254.20 reg.yunwei.edu
#192.168.42.30 reg.yunwei.edu
192.168.42.172 node3
192.168.42.122 node2
192.168.42.121 node1
192.168.42.30 dlp 

2、并配置各节点ssh无密钥登陆

 

3、安装docker环境

[root@node1 ~]# ls
anaconda-ks.cfg  docker  docker.tar.gz  image  yum-repo.sh
[root@node1 ~]# cd docker
[root@node1 docker]# ls
ca.crt  docker-app.tar.gz  docker.sh  remove.sh
[root@node1 docker]# bash docker.sh 

4、下载配置文件并且导入镜像

wget http://download2.yunwei.edu/shell/ansible-galera.tar.gz
[root@dlp ~]# ls
anaconda-ks.cfg                       config.tar.gz  docker.tar.gz  kubernetes.tar.gz   test      username
ansible-galera.tar.gz                 data           galera.tar.gz  mariadb-galera.tar  total.sh  yum-repo.sh
bash-completion-2.1-6.el7.noarch.rpm  docker         kubernetes     password            try.html
[root@dlp ~]# tar xf ansible-galera.tar.gz 
[root@dlp ~]# ls
anaconda-ks.cfg        bash-completion-2.1-6.el7.noarch.rpm  docker         kubernetes          password  try.html
ansible-galera         config.tar.gz                         docker.tar.gz  kubernetes.tar.gz   test      username
ansible-galera.tar.gz  data                                  galera.tar.gz  mariadb-galera.tar  total.sh  yum-repo.sh
[root@dlp ~]# cd ansible-galera
[root@dlp ansible-galera]# ls
bin  delete.yml  hosts  install.yml  roles
[root@dlp ansible-galera]# mv * /etc/ansible/
[root@dlp ansible-galera]# cd /etc/ansible/
[root@dlp ansible]# ls
bin  delete.yml  hosts  install.yml  roles

wget http://download2.yunwei.edu/shell/galera.tar.gz
[root@dlp ~]# mv config.tar.gz mariadb-galera.tar /etc/ansible/bin/
[root@dlp ~]# cd /etc/ansible/
[root@dlp ansible]# ls
bin  delete.yml  hosts  install.yml  roles
[root@dlp ansible]# cat hosts
[all]
192.168.42.121
192.168.42.122
192.168.42.172

[master]
192.168.42.121

[slave1]
192.168.42.122

[slave2]
192.168.42.172

[all:vars]
#定义集群ip
master="192.168.42.121"
slave1="192.168.42.122"
slave2="192.168.42.172"

#部署目录，即 ansible 工作目录
base_dir="/etc/ansible"

#默认软件安装目录
opt_dir="/opt"

在部署节点：

docker pull reg.yunwei.edu/learn/ansible:alpine3

docker run -itd -v /etc/ansible:/etc/ansible -v /etc/kubernetes/:/etc/kubernetes/ -v /root/.kube:/root/.kube -v /usr/local/bin/:/usr/local/bin/ 1acb4fd5df5b  /bin/sh

进入容器设置免密钥，测试是否能ping通：
ansible all -m ping
/ # cd /etc/ansible/
/etc/ansible # ls
bin          delete.yml   hosts        install.yml  roles
/etc/ansible # ansible-playbook install.yml 

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、查看集群是否同步

[root@node1 docker]# docker ps -a
CONTAINER ID        IMAGE                                    COMMAND                  CREATED             STATUS                        PORTS               NAMES
08ccff9d97ad        panubo/mariadb-galera                    "/galera-entrypoint.…"    minutes ago      Up  minutes                                     galera1
[root@node1 docker]# docker exec -it 08ccff9d97ad sh
# mysql -uroot -p123
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is
Server version: 10.1.-MariaDB-~jessie mariadb.org binary distribution

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

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

MariaDB [(none)]> SHOW STATUS LIKE 'wsrep_cluster_size';
+--------------------+-------+
| Variable_name      | Value |
+--------------------+-------+
| wsrep_cluster_size |      |
+--------------------+-------+
 row in set (0.34 sec)

MariaDB [(none)]> create database test1;
Query OK,  row affected (0.30 sec)

[root@node2 ~]# docker exec -it d8b804886305 sh
# mysql -uroot -p123
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is
Server version: 10.1.-MariaDB-~jessie mariadb.org binary distribution

Copyright (c) , , 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 |
| mysql              |
| performance_schema |
| test               |
| test1              |
+--------------------+
 rows in set (0.73 sec)

四、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     |

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

五、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