MySQL-Xenon高可用

在MySQL5.5及以下传统复制的时代，MHA在MySQL高可用应用中非常成熟，在MySQL5.6的GTID时代开启以后，MHA却没有与新的MySQL一起顺应潮流，MHA最近一次发版是2018年。于是RadonDB开发团队研发并开源新一代MySQL集群高可用工具。基于Raft协议进行无中心化选主，实现主从秒级切换；基于semi-sync机制，保障数据不丢失，实现数据强一致性。并结合MySQL5.7及以上版本并行复制特性，实现binlog并行回放那个，大大降低从库延迟。

代码托管：https://github.com/radondb/xenon

Xenon 实验环境

master db01 192.168.3.112
slave db02 192.168.3.113
salve db03 192.168.3.114

1、配置基于增强半同步的主从复制，配置过程详见《MySQL-主从复制》中。

2、三台主机安装 xtrabackup

# rpm-ivhpercona-xtrabackup-80-8.0.13-1.el7.x86_64.rpm

3、三台主机配置互信，免密ssh登录

4、三台主机安装 go 环境

go 下载地址：https://golang.google.cn/dl/

# tar -zxvf go1.14.8.linux-amd64.tar.gz -C /opt/# vim /etc/profileexport GOPATH=/opt/go/binexport PATH=$PATH:$GOPATH

5、安装Xenon

下载地址：https://github.com/radondb/xenon/

# unzip xenon-master.zip# make

6、三台主机配置 Xenon

# mkdir /opt/xenon# cp -r /root/xenon-master/bin/ /opt/xenon/# mkdir /opt/xenon/etc# cp /root/xenon-master/conf/xenon-sample.conf.json /opt/xenon/etc/xenon.json#echo"/opt/xenon/etc/xenon.json" > /opt/xenon/bin/config.path# chown mysql.mysql /opt/xenon/ -R

修改 xenon.json 文件

# more /opt/xenon/etc/xenon.json {"server": {"endpoint":"192.168.3.114:8801" },"raft": {"meta-datadir":"raft.meta","leader-start-command":"sudo /sbin/ip a a 192.168.3.110/24 dev ens33 && arping -c 3 -A 192.168.3.110 -I ens33","leader-stop-command":"sudo /sbin/ip a d 192.168.3.110/24 dev ens33" },"mysql": {"admin":"root","version":"mysql80","passwd":"123","host":"192.168.3.114","port":3306,"basedir":"/opt/mysql","defaults-file":"/opt/mysql/.my.cnf","ping-timeout":1000,"master-sysvars":"tokudb_fsync_log_period=default;sync_binlog=default;innodb_flush_log_at_trx_commit=default","slave-sysvars" : "tokudb_fsync_log_period=1000;sync_binlog=1000;innodb_flush_log_at_trx_commit=2" },"replication": {"user":"repl","passwd":"repl" },"backup": {"ssh-host":"192.168.3.114","ssh-user":"root","ssh-passwd":"root123","basedir":"/opt/mysql","backupdir":"/opt/mysql/data","xtrabackup-bindir":"/bin","max-allowed-local-trx-count": 1000,"backup-use-memory": "1GB","backup-parallel": 4 },"rpc": {"request-timeout":500 },"log": {"level":"INFO" }}

三台主机启动 xenon ，并添加节点。官方建议Xenon和MySQL使用同一用户启动。

以普通用户启动要配置sudo

## NOPASSWD 免输入密码sudo，不加此选项，则启动失败# visudomysqlALL=(ALL) NOPASSWD: /usr/sbin/ip

在 mysql 用户下启动，xenon会自动拉起mysql进程服务

# su - mysql$ nohup /opt/xenon/bin/xenon -c /opt/xenon/etc/xenon.json > /opt/xenon/xenon.log 2>&1 &$ ./xenoncli cluster add 192.168.3.112:8801,192.168.3.113:8801,192.168.3.114:8801

查看集群状态

$ ./xenoncli cluster status

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

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

|192.168.3.112:8801| [ViewID:3 EpochID:0]@LEADER | RUNNING | ON |state:[NONE]␤ | [ALIVE] [READWRITE] | [true/true] | 192.168.3.112:8801 |

| || || LastError: || ||

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

|192.168.3.113:8801| [ViewID:3 EpochID:0]@FOLLOWER | RUNNING | ON |state:[NONE]␤ | [ALIVE] [READONLY] | [true/true] | 192.168.3.112:8801 |

| || || LastError: || ||

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

|192.168.3.114:8801| [ViewID:3 EpochID:0]@FOLLOWER | RUNNING | ON |state:[NONE]␤ | [ALIVE] [READONLY] | [true/true] | 192.168.3.112:8801 |

| || || LastError: || ||

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

$ ./xenoncli cluster mysql

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

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

| 192.168.3.112:8801 | LEADER | ALIVE | READWRITE | [mysql-bin.000008/388] | [true/true] | 0 ||

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

|192.168.3.113:8801| FOLLOWER | ALIVE | READONLY | [mysql-bin.000008/388] | [true/true] |0| |

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

| 192.168.3.114:8801 | FOLLOWER | ALIVE | READONLY | [mysql-bin.000008/388] | [true/true] | 0 ||

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

关闭集群``` shell# ./xenoncli mysql stopmonitor# ./xenoncli mysql shutdown# pkill xenon

Xenon 备份

$ /opt/xenon/bin/xenoncli mysql backup--to=/opt/mysql/9876

2023/06/1815:48:41.643361 callx.go:92: [WARNING] get.client.error[dial tcp 192.168.3.113:8801: connect: connection refused]

2023/06/1815:48:41.643473 callx.go:163: [WARNING] get.client.error[dial tcp 192.168.3.113:8801: connect: connection refused]

2023/06/1815:48:41.652513 callx.go:183: [WARNING] best.slave.can't.found.set.to.leader[192.168.3.112:8801] 2023/06/18 15:48:41.652531 mysql.go:562: [WARNING] S1-->found.the.best.backup.host[192.168.3.112:8801].... 2023/06/18 15:48:41.783611 mysql.go:576: [WARNING] S2-->rm.and.mkdir.backupdir[/opt/mysql/9876] 2023/06/18 15:48:41.783637 mysql.go:581: [WARNING] S3-->xtrabackup.begin....

 2023/06/18 15:48:41.784505 callx.go:442: [WARNING] rebuildme.backup.req[&{From: BackupDir:/opt/mysql/9876 SSHHost:192.168.3.114 SSHUser:mysql SSHPasswd:mysql SSHPort:22 IOPSLimits:100000 XtrabackupBinDir:/usr/bin}].from[192.168.3.112:8801]

2023/06/18 15:48:42.804183 common.go:41: [PANIC] rsp[cmd.outs.[completed OK!].found[0]!=expects[1]] != [OK]panic: [PANIC] rsp[cmd.outs.[completed OK!].found[0]!=expects[1]] != [OK]goroutine 1 [running]:xbase/xlog.(*Log).Panic(0xc0000ec170, 0x8dd965, 0xf, 0xc0000e1d68, 0x1, 0x1) /root/xenon-master/src/xbase/xlog/xlog.go:164 +0x153cli/cmd.RspOK(...) /root/xenon-master/src/cli/cmd/common.go:41cli/cmd.mysqlDoBackupCommandFn(0xc0000fe000, 0xc0000ec200, 0x0, 0x1) /root/xenon-master/src/cli/cmd/mysql.go:584 +0x481vendor/github.com/spf13/cobra.(*Command).execute(0xc0000fe000, 0xc0000ec1e0, 0x1, 0x1, 0xc0000fe000, 0xc0000ec1e0) /root/xenon-master/src/vendor/github.com/spf13/cobra/command.go:603 +0x22evendor/github.com/spf13/cobra.(*Command).ExecuteC(0xc7f800, 0x1, 0xc0000e1f78, 0x40746f) /root/xenon-master/src/vendor/github.com/spf13/cobra/command.go:689 +0x2bcvendor/github.com/spf13/cobra.(*Command).Execute(...) /root/xenon-master/src/vendor/github.com/spf13/cobra/command.go:648main.main() /root/xenon-master/src/cli/cli.go:43 +0x31

从输出日志信息看是备份失败，经排查是因为xenon.json配置中 mysql 部分的 host 参数导致。

"mysql": {"admin":"root","version":"mysql80","passwd":"123","host":"192.168.3.114", # 设置为主机IP地址，设置为localhost导致备份失败"port":3306,"basedir":"/opt/mysql","defaults-file":"/opt/mysql/.my.cnf","ping-timeout":1000,"master-sysvars":"tokudb_fsync_log_period=default;sync_binlog=default;innodb_flush_log_at_trx_commit=default","slave-sysvars" : "tokudb_fsync_log_period=1000;sync_binlog=1000;innodb_flush_log_at_trx_commit=2" },

链接：https://www.cnblogs.com/zbc230/p/17486690.html

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