MySQL-MMM的负载均衡及高可用

用途mmm是基于信息探测方式进行mysql主从复制架构的监测与故障转移mmm可以做到负载均衡,100%的数据可用性mmm所涉及的检查项服务器可达性,服务可达性,复制线程可

用途
 mmm是基于信息探测方式进行mysql主从复制架构的监测与故障转移
 mmm可以做到负载均衡,100%的数据可用性
 mmm所涉及的检查项   服务器可达性,服务可达性,复制线程可控性

 如图: 当 master1在宕机时, mmm可以将之前分摊的流量进行转移,甚至于将从服务器提升为主

延续双主模型.

mmm-agent端状态一览
   online 节点可用
   replication_delay 复制延迟或无法进行(检查req_backlog文件)
   replication_fail 复制失败
   awating_recovery 等待恢复
   hard_offline  主机离线
   admin_offline  主控端离线
   unknown  未知错误

规划如下
172.16.43.200  主控机器负责监测与资源的管理
172.16.43.1  vip(172.16.43.11)  master1 主主复制第一台(可读写)
172.16.43.2  vip(172.16.43.12)  master2 主主复制第二台(只读)
172.16.43.3  vip(172.16.43.13)  slave   主从方式复制 1 , 2 的信息(只读)

实验过程如下

主控安装安装: ansible, mysql客户端, mysql-mmm
集群节点安装如下: mariadb, mysql-agent

i)  主机互信,ansible部署的关键

yum -y install ansible-1.5.4-1.el6.noarch.rpm vim /etc/ansible/hosts # 主控节点完成 [masterserver] master1.king.com master2.king.com . [slaveserver] slave.king.com # 主控节点完成互信多个被管理节点不重复了 ssh-keygen -t rsa ssh-copy-id -i .ssh/id_rsa.pub root@slave.king.com . # 主控节点完成安装mysql-mmm* yum -y install mysql mysql-mmm* . # 实现mmm配置文件有两种 # 1. 主控端 mmm_common, mmm_mon # 2. 集群端 mmm_common, mmm_agent # 主控端配置common /etc/mysql-mmm/mmm_common.conf active_master_role writer . cluster_interface eth0 pid_path /var/run/mysql-mmm/mmm_agentd.pid bin_path /usr/sbin replication_user repl replication_password repl agent_user mmm_agent agent_password agent_password . ip 172.16.43.1 mode master peer master2 . ip 172.16.43.2 mode master peer master1 . ip 172.16.43.3 mode slave . # 谁能写 vip是多少(参照本文配置) hosts master1, master2 ips 172.16.43.11 mode exclusive . # 谁能读 vip是多少(参照本文配置) hosts master1, master2 ips 172.16.43.11, 172.16.43.12, 172.16.43.13 mode balanced . # 主控节点完成 vim /etc/mysql-mmm/mmm_mon.conf # 需要改 ping_ips, 把你想监控的集群加入进入就可以了 # 172.16.0.1 是网关ip ping_ips 172.16.0.1, 172.16.43.1, 172.16.43.2, 172.16.43.3 . monitor_user mmm_monitor monitor_password monitor_password

ii) 安装 mariadb, mysql-agent安装与配置

# 编写 install.yaml, 使用ansible-playbook执行按成安装配置 - hosts: masterserver:slaveserver remote_user: root tasks: - name: mariadb install copy: src=/root/mariadb-10.0.10-linux-x86_64.tar.gz dest=/tmp - name: conf service command: tar xf /tmp/mariadb-10.0.10-linux-x86_64.tar.gz -C /usr/local ############################################################### # 见谅下面的 name: x , 写了半天才知道不能在一个name中包含多个command,所以.. # ############################################################### - name: 1 command: ln -sv /usr/local/mariadb-10.0.10-linux-x86_64 /usr/local/mysql - name: 2 command: cp /usr/local/mysql/support-files/mysql.server /etc/rc.d/init.d/mysqld - name: 3 command: chmod x /etc/rc.d/init.d/mysqld - name: 4 command: mkdir /mydata/data -p - name: 5 command: mkdir /mydata/binlogs -p - name: 6 command: mkdir /mydata/relaylogs -p - name: 7 command: useradd -r -s /sbin/nologin mysql -U - name: 8 command: chown mysql.mysql /mydata -R - name: 9 command: chown mysql.mysql /usr/local/mysql -R - name: 9-1 # 将本地配置好的安装文件移植到集群节点, 解压的配置文件可能不符合要求 copy: src=/usr/local/mysql/scripts/mysql_install_db dest=/usr/local/mysql/scripts/ - name: 10 command: /usr/local/mysql/scripts/mysql_install_db --user=mysql --datadir=/mydata/data - name: mariadb conf # 此处配置文件 /etc/my.cnf 配置好 # log-bin=/mydata/binlogs/mysql-bin # relay-log=/mydata/relaylogs/relay-bin # datadir=/mydata/data copy: src=/etc/my.cnf dest=/etc/my.cnf notify: - restart mariadb - name: install mysql-mmm-agent yum: name=mysql-mmm-agent state=present - name: conf mysql-mmm-agent copy: src=/etc/mysql-mmm/mmm_common.conf dest=/etc/mysql-mmm - name: modify mmm_agent.conf command: sed -i 's@^(this[[:space:]]).*@1{{ item }}@' /etc/mysql-mmm/mmm_agent.conf with_items: - master1 - master2 - slave - name: 11 command: sed -i 's@^(ENABLED=).*@11@' /etc/default/mysql-mmm-agent handlers: - name: restart mariadb service: name=mysqld state=restarted

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