Mysql半雙工主從復(fù)制
https://blog.csdn.net/qq_35349982/article/details/108558868
繼續(xù)主從復(fù)制之后的MHA搭建

master-1 192.168.182.128

slave-1 192.168.182.132

slave-2 192.168.182.130

mha-1 192.168.182.133

準(zhǔn)備工作

關(guān)閉防火墻

1.機(jī)器都要做關(guān)閉防火墻：

systemctl stop firewalld.servicesystemctl disable firewalld.servicesystemctl status firewalld.service

2. ssh互通環(huán)境

實現(xiàn)遠(yuǎn)程控制及數(shù)據(jù)管理功能：

在Manager節(jié)點生成密鑰對兒，并設(shè)置其可遠(yuǎn)程連接本地主機(jī)后， 將私鑰文件及authorized_keys文件復(fù)制給余下的所有節(jié)點即可。

#master (在root目錄下創(chuàng)建密鑰，不需要輸密鑰，一路回車鍵) ssh-keygen -t rsa #一定要用root用戶執(zhí)行，否則權(quán)限不夠 #復(fù)制給其他節(jié)點的時候，還要再輸入服務(wù)器的密碼 ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.182.132 ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.182.130 ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.182.133 ##復(fù)制給其他節(jié)點 #salve1 ssh-keygen -t rsa ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.182.130 ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.182.128 ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.182.133 #salve2 ssh-keygen -t rsa ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.182.132 ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.182.128 ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.182.133 #mh1 ssh-keygen -t rsa ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.182.132 ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.182.128 ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.182.130

補(bǔ)充

#查看生成公鑰 cat ~/.ssh/id_rsa.pub

參考:

https://www.jianshu.com/p/4d3888e116b2

MHA搭建

前提:ssh互通環(huán)境

1. MHA安裝之前需要先安裝這兩個查詢依賴，不然可能會安裝失敗

yum install perl-ExtUtils-MakeMaker yum install perl-Test-Simple

2. 四個節(jié)點都需安裝node（mha服務(wù)額外安裝一個mannger服務(wù)）

yum install -y mha4mysql-node-0.58-0.el7.centos.noarch.rpm

master節(jié)點與連兩個slave節(jié)點需要安裝perl包（三個節(jié)點都執(zhí)行）

#（進(jìn)入mysql授權(quán)命令）MHA的管理賬號 grant all privileges on *.* to 'mhamanger'@'%' identified by 'mhamanger'; flush privileges;

3. 在MHA節(jié)點上安裝（二選一）

有兩個安裝方法：選一個就行，我是用的方案二，安裝的特別慢

• 安裝MHA方案一：

安裝本地的mha4mysql-manager-0.58-0.el7.centos.noarch.rpm的文件

yum install perl-DBD-MySQL -y rpm -ivh mha4mysql-node-0.58-0.el7.centos.noarch.rpm yum install -y epel-release #安裝perl包依賴的時候，可能會報錯，執(zhí)?以下命令即可： sed -i 's#https://#http://#g' /etc/yum.repos.d/epel*repo yum install -y perl-Config-Tiny perl-Log-Dispatch perl-ParallelForkManager perl-Time-HiRes rpm -ivh mha4mysql-manager-0.58-0.el7.centos.noarch.rpm

• 安裝MHA方案二：

去官網(wǎng)下載，tar的安裝包，初始化安裝

yum install perl-DBD-MySQL perl-Config-Tiny perl-Log-Dispatch perl-Parallel-ForkManager perl-Time-HiRes # 去下載manger的版本 https://github.com/yoshinorim/mha4mysql-manager/releases ##mha4mysql-manager-0.58.tar.gz cd /usr/local/src ##解壓 tar xf mha4mysql-node-0.57.tar.gz #進(jìn)目錄 cd mha4mysql-node-0.57 ##下面這步可能會失敗，要安裝一個 perl perl Makefile.PL ##初始化 make && make install

4. 創(chuàng)建配置文件

#配置?件?錄 mkdir -p /etc/mha #日志目錄 mkdir -p /var/log/mha/app1 #創(chuàng)建配置文件 vi /etc/mha/app1.cnf [server default] manager_log=/var/log/mha/app1/manager manager_workdir=/var/log/mha/app1 master_binlog_dir=/var/lib/mysql password=root ping_interval=2 repl_password=root repl_user=root ssh_user=root user=root [server1] hostname=192.168.182.128 port=3306 [server2] hostname=192.168.182.132 port=3306 [server3] hostname=192.168.182.130 port=3306

5.對節(jié)點進(jìn)行檢測( 驗證SSH通信)

masterha_check_ssh --conf=/etc/mha/app1.cnf

如果最后一行顯示為[info]All SSH connection tests passed successfully.則表示成功

5.檢查管理的MySQL復(fù)制集群的連接配置參數(shù)是否OK

masterha_check_repl --conf=/etc/mha/app1.cnf

6.開啟MHA Manager監(jiān)控

nohup masterha_manager --conf=/etc/mha/app1.cnf --remove_dead_master_conf --ignore_last_failover < /dev/null> /var/log/mha/app1/manager.log 2>&1 &

–remove_dead_master_conf //該參數(shù)代表當(dāng)發(fā)生主從切換后，老的主庫的ip將會從配置文件中移除。

–manger_log //日志存放位置

• 關(guān)閉監(jiān)控

masterha_stop -conf=/etc/mha/app1.cnf

7.查看master節(jié)點狀態(tài)

masterha_check_status -conf=/etc/mha/app1.cnf

查看日志（報錯的話，方便查日志）

```shell tail -200 /etc/mha_master/manager.log ```

8.模擬宕機(jī)狀態(tài)

##在master節(jié)點上運(yùn)行 systemctl stop mysqld ## 觀察mhamanger節(jié)點?志： tail -f /var/log/mha/app1/manager

9. 主機(jī)修復(fù)后，需要在mha中從新添加服務(wù)器節(jié)點

## master節(jié)點 systemctl start mysqld ##mha的配置文件，從新添加修復(fù)后的服務(wù)器節(jié)點，然后重新啟動MHA服務(wù)器 [server1] hostname=192.168.182.128 port=3306

完整的配置

• MHA的配置

[server default] manager_log=/var/log/mha/app1/manager manager_workdir=/var/log/mha/app1 master_binlog_dir=/var/lib/mysql password=root ping_interval=2 repl_password=root repl_user=root ssh_user=root user=root [server1] hostname=192.168.182.128 port=3306 [server2] hostname=192.168.182.132 port=3306[server3] hostname=192.168.182.130 port=3306

• master節(jié)點的配置

[mysqld] # # Remove leading # and set to the amount of RAM for the most important data # cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%. # innodb_buffer_pool_size = 128M # # Remove leading # to turn on a very important data integrity option: logging # changes to the binary log between backups. # log_bin log_bin=mysql-bin server-id=1 sync-binlog=1 binlog-ignore-db=preformance_schema binlog-ignore-db=information_schema binlog-ignore-db=sys rpl_semi_sync_master_enabled=1 # Remove leading # to set options mainly useful for reporting servers. # The server defaults are faster for transactions and fast SELECTs. # Adjust sizes as needed, experiment to find the optimal values. # join_buffer_size = 128M # sort_buffer_size = 2M # read_rnd_buffer_size = 2M datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock# Disabling symbolic-links is recommended to prevent assorted security risks symbolic-links=0log-error=/var/log/mysqld.log pid-file=/var/run/mysqld/mysqld.pid

• slave1的配置

[mysqld] # # Remove leading # and set to the amount of RAM for the most important data # cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%. # innodb_buffer_pool_size = 128M # # Remove leading # to turn on a very important data integrity option: logging # changes to the binary log between backup log_bin=mysql-bin server-id=2 relay_log=mysql-replay-bin read_only=1 relay_log_purge=0 binlog-ignore-db=preformance_schema binlog-ignore-db=information_schema binlog-ignore-db=sys rpl_semi_sync_slave_enabled=1# Remove leading # to set options mainly useful for reporting servers. # The server defaults are faster for transactions and fast SELECTs. # Adjust sizes as needed, experiment to find the optimal values. # join_buffer_size = 128M # sort_buffer_size = 2M # read_rnd_buffer_size = 2M datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock# Disabling symbolic-links is recommended to prevent assorted security risks symbolic-links=0 log-error=/var/log/mysqld.log pid-file=/var/run/mysqld/mysqld.pid

• slave2的配置

[mysqld] # # Remove leading # and set to the amount of RAM for the most important data # cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%. # innodb_buffer_pool_size = 128M # # Remove leading # to turn on a very important data integrity option: logging # changes to the binary log between backups. log_bin=mysql-bin server-id=3 relay_log=mysql-replay-bin read_only=1 relay_log_purge=0 binlog-ignore-db=preformance_schema binlog-ignore-db=information_schema binlog-ignore-db=sys rpl_semi_sync_slave_enabled=1 # Remove leading # to set options mainly useful for reporting servers. # The server defaults are faster for transactions and fast SELECTs. # Adjust sizes as needed, experiment to find the optimal values. # join_buffer_size = 128M # sort_buffer_size = 2M # read_rnd_buffer_size = 2M datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock# Disabling symbolic-links is recommended to prevent assorted security risks symbolic-links=0log-error=/var/log/mysqld.log pid-file=/var/run/mysqld/mysqld.pid

參考

https://blog.csdn.net/qq_23830637/article/details/106968615####mha官網(wǎng) https://github.com/yoshinorim/mha4mysql-manager/releases #####mha安裝前rpm https://www.cnblogs.com/ding2016/p/9102052.html

問題：

解決Enter passphrase for key

#ssh-agent是用于管理密鑰，ssh-add用于將密鑰加入到ssh-agent中，SSH可以和ssh-agent通信獲取密鑰， eval `ssh-agent` ssh-add

https://blog.csdn.net/superbfly/article/details/75287741

ssh重啟失敗

Failed to issue method call: Unit ssh.service failed to load: No such file or directory.

systemctl enable sshd.servicesystemctl start sshd.servicesystemctl status sshd.service

https://blog.csdn.net/mengjiangtao/article/details/24195523

manager_log=/var/log/mha/app1/manager manager_workdir=/var/log/mha/app1 master_binlog_dir=/var/lib/mysql password=root ping_interval=2 repl_password=root repl_user=root ssh_user=root user=root [server1] hostname=192.168.182.128 port=3306 [server2] hostname=192.168.182.132 port=3306 [server3] hostname=192.168.182.130 port=3306 #將來可不可以成為master候選節(jié)點/主節(jié)點 #candidate_master=1 # master候選人，master掛掉后，這個節(jié)點成為master # condidate_master=1################以下的了解即可 #設(shè)置master 保存binlog的位置，以便MHA可以找到master的日志 master_binlog_dir=/opt/mysql_data manager_workdir=/var/log/mha_master/app1.log #設(shè)置master 保存binlog的位置，以便MHA可以找到master的日志，我這里的也就是mysql的數(shù)據(jù)目錄 manager_log=/var/log/mha_master/manager.log #設(shè)置自動failover時候的切換腳本 master_ip_failover_script="/etc/mha_master/scripts/master_ip_failover" #設(shè)置手動切換時候的切換腳本 master_ip_online_change_script="/etc/mha_master/scripts/master_ip_online_change" #//設(shè)置發(fā)生切換后發(fā)送的報警的腳本 report_script="/etc/mha_master/scripts/send_report" #設(shè)置遠(yuǎn)端mysql在發(fā)生切換時binlog的保存位置 remote_workdir=/tmp ##實現(xiàn)多路由監(jiān)測Master的可用性 secondary_check_script= /usr/local/bin/masterha_secondary_check -s 10.0.20.201 -s 10.0.20.202 -s 10.0.20.203 -s 10.0.20.204 shutdown_script="" ################以下的了解即可

參考

https://blog.csdn.net/qq_23830637/article/details/106968615
https://www.cnblogs.com/panwenbin-logs/p/8306906.html#autoid-0-0-0
http://www.ttlsa.com/mysql/step-one-by-one-deploy-mysql-mha-cluster/
https://www.cnblogs.com/shengdimaya/p/6949882.html
https://blog.csdn.net/qq_23830637/article/details/106968615
https://www.cnblogs.com/panwenbin-logs/p/8306906.html#autoid-0-0-0
http://www.ttlsa.com/mysql/step-one-by-one-deploy-mysql-mha-cluster/
https://www.cnblogs.com/shengdimaya/p/6949882.html

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