118 lines
3.5 KiB
Markdown
118 lines
3.5 KiB
Markdown
---
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title: "CentOS7 安装 Mysql Galera 集群"
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date: 2019-10-30T11:13:44+08:00
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lastmod: 2019-10-30T11:13:44+08:00
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keywords: []
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tags: ["mysql", "galera"]
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categories: ["database"]
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---
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## 环境
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cpu | mem | hostname | public ip | cluster ip | CentOS | MySQL
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---- | ---- | ---- | ---- | ---- | ---- | ----
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双核 | 2GB | mysql_1 | 10.0.0.231 | 10.10.10.1 | 7.5 | 5.7
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双核 | 2GB | mysql_2 | 10.0.0.232 | 10.10.10.2 | 7.5 | 5.7
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双核 | 2GB | mysql_3 | 10.0.0.233 | 10.10.10.3 | 7.5 | 5.7
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## 创建 galera yum 源文件
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```bash
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cat > /etc/yum.repos.d/galera.repo <<-END
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[galera]
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name = Galera
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baseurl = http://releases.galeracluster.com/galera-3/centos/7/x86_64/
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gpgkey = http://releases.galeracluster.com/GPG-KEY-galeracluster.com
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gpgcheck = 1
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[mysql-wsrep]
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name = MySQL-wsrep
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baseurl = http://releases.galeracluster.com/mysql-wsrep-5.7/centos/7/x86_64/
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gpgkey = http://releases.galeracluster.com/GPG-KEY-galeracluster.com
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gpgcheck = 1
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END
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```
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## 安装
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```bash
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yum install galera-3 mysql-wsrep-5.7 rsync
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```
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## 修改 /etc/my.cnf
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```
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[mysqld]
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datadir=/var/lib/mysql
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socket=/var/lib/mysql/mysql.sock
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user=mysql
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binlog-format=ROW
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bind-address=0.0.0.0
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default-storage-engine=innodb
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innodb-autoinc-lock-mode=2
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innodb-flush-log-at-trx-commit=0
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innodb-buffer-pool-size=1024M #物理内存一半
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wsrep-provider=/usr/lib64/galera-3/libgalera_smm.so
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wsrep-provider-options="gcache.dir=/var/lib/gcache;gcache.size=1G;gcache.recover=yes;pc.recovery=TRUE"
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wsrep-cluster-name="mysql_galera_cluster" #集群名字
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wsrep-cluster-address="gcomm://10.10.10.1,10.10.10.2,10.10.10.3"
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wsrep-sst-method=rsync
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wsrep-node-name=mysql_1 #当前节点名字
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wsrep-node-address="10.10.10.1" #当前节点 cluster ip
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#wsrep-auto-increment-control=OFF #只通过一个节点做增删改时使用
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[mysql_safe]
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log-error=/var/log/mysqld.log
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pid-file=/var/run/mysqld/mysqld.pid
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!includedir /etc/my.cnf.d/
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```
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## 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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```bash
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/usr/bin/mysqld_bootstrap
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# 该命令会启动本机的 mysqld 服务
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systemctl status mysqld
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```
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## 查找密码，修改初始密码
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```bash
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grep -i password /var/log/messages
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# 记录输出的密码
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mysqladmin -uroot -p password 'P@sswo2d'
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# 根据提示输入上一步输出的密码
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```
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## 在其他节点上启动 mysqld 服务
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```bash
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systemctl start mysqld
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```
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## 查看集群节点数量
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```sql
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show status like 'wsrep_cluster_size';
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```
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## ssl 加密同步数据(不推荐，存在性能损失)
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- 生成证书
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```bash
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mkdir /etc/my.cnf.d/ssl && cd /etc/my.cnf.d/ssl
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openssl genrsa 2048 > ca-key.pem
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openssl req -new -x509 -nodes -days 365000 \
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-key ca-key.pem -out ca-cert.pem #按提示输入信息
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openssl req -newkey rsa:2048 -days 365000 \
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-nodes -keyout server-key.pem -out server-req.pem #按提示输入信息，与上一步信息不同
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openssl rsa -in server-key.pem -out server-key.pem
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openssl x509 -req -in server-req.pem -days 365000 \
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-CA ca-cert.pem -CAkey ca-key.pem -set_serial 01 \
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-out server-cert.pem
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```
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- 修改配置文件 my.cnf
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```
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# 在 wsrep_provider_options 中添加如下选项，选项间用分号";"间隔
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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
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```
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- 重新启动集群
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## ssl 加密客户端(不推荐，存在性能损失)
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- MySQL 5.7 server 自带 ssl 加密，客户端连接时，指定参数 --ssl-mode=required 即可
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