环境

cpu mem hostname public ip cluster ip CentOS MySQL
双核 2GB mysql_1 10.0.0.231 10.10.10.1 7.5 5.7
双核 2GB mysql_2 10.0.0.232 10.10.10.2 7.5 5.7
双核 2GB mysql_3 10.0.0.233 10.10.10.3 7.5 5.7

创建 galera yum 源文件

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cat > /etc/yum.repos.d/galera.repo <<-END
[galera]
name = Galera
baseurl = http://releases.galeracluster.com/galera-3/centos/7/x86_64/
gpgkey = http://releases.galeracluster.com/GPG-KEY-galeracluster.com
gpgcheck = 1

[mysql-wsrep]
name = MySQL-wsrep
baseurl = http://releases.galeracluster.com/mysql-wsrep-5.7/centos/7/x86_64/
gpgkey = http://releases.galeracluster.com/GPG-KEY-galeracluster.com
gpgcheck = 1
END

安装

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yum install galera-3 mysql-wsrep-5.7 rsync

修改 /etc/my.cnf

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[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
user=mysql
binlog-format=ROW
bind-address=0.0.0.0
default-storage-engine=innodb
innodb-autoinc-lock-mode=2
innodb-flush-log-at-trx-commit=0
innodb-buffer-pool-size=1024M #物理内存一半
wsrep-provider=/usr/lib64/galera-3/libgalera_smm.so
wsrep-provider-options="gcache.dir=/var/lib/gcache;gcache.size=1G;gcache.recover=yes;pc.recovery=TRUE"
wsrep-cluster-name="mysql_galera_cluster" #集群名字
wsrep-cluster-address="gcomm://10.10.10.1,10.10.10.2,10.10.10.3"
wsrep-sst-method=rsync
wsrep-node-name=mysql_1 #当前节点名字
wsrep-node-address="10.10.10.1" #当前节点 cluster ip
#wsrep-auto-increment-control=OFF #只通过一个节点做增删改时使用

[mysql_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

!includedir /etc/my.cnf.d/

随机选择一个节点，使用专用脚本 mysqld_bootstrap 初始化集群

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/usr/bin/mysqld_bootstrap
# 该命令会启动本机的 mysqld 服务
systemctl status mysqld

查找密码，修改初始密码

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grep -i password /var/log/messages
# 记录输出的密码
mysqladmin -uroot -p password 'P@sswo2d'
# 根据提示输入上一步输出的密码

在其他节点上启动 mysqld 服务

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systemctl start mysqld

查看集群节点数量

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show status like 'wsrep_cluster_size';

ssl 加密同步数据(不推荐，存在性能损失)

  • 生成证书

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    mkdir /etc/my.cnf.d/ssl && cd /etc/my.cnf.d/ssl
openssl genrsa 2048 > ca-key.pem
openssl req -new -x509 -nodes -days 365000 \
      -key ca-key.pem -out ca-cert.pem #按提示输入信息
openssl req -newkey rsa:2048 -days 365000 \
      -nodes -keyout server-key.pem -out server-req.pem #按提示输入信息，与上一步信息不同
openssl rsa -in server-key.pem -out server-key.pem
openssl x509 -req -in server-req.pem -days 365000 \
      -CA ca-cert.pem -CAkey ca-key.pem -set_serial 01 \
      -out server-cert.pem

  • 修改配置文件 my.cnf

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    # 在 wsrep_provider_options 中添加如下选项，选项间用分号";"间隔
socket.ssl_key=/etc/my.cnf.d/ssl/server-key.pem; socket.ssl_cert=/etc/my.cnf.d/ssl/server-cert.pem; socket.ssl_ca=/etc/my.cnf.d/ssl/ca-cert.pem; socket.checksum=2; socket.ssl_cipher=AES128-SHA

  • 重新启动集群

ssl 加密客户端(不推荐，存在性能损失)

  • MySQL 5.7 server 自带 ssl 加密，客户端连接时，指定参数 –ssl-mode=required 即可