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 -ivh percona-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/profile
export GOPATH=/opt/go/bin
export 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
# visudo
mysql ALL=(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
+--------------------+-------------------------------+---------+---------+--------------------------+---------------------+----------------+--------------------+
| ID | Raft | Mysqld | Monitor | Backup | Mysql | IO/SQL_RUNNING | MyLeader |
+--------------------+-------------------------------+---------+---------+--------------------------+---------------------+----------------+--------------------+
| 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
+--------------------+----------+-------+-----------+------------------------+----------------+----------------+------------+
| ID | Raft | Mysql | Option | Master_Log_File/Pos | IO/SQL_Running | Seconds_Behind | Last_Error |
+--------------------+----------+-------+-----------+------------------------+----------------+----------------+------------+
| 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
2023/06/18 15:48:41.643361 callx.go:92: [WARNING] get.client.error[dial tcp 192.168.3.113:8801: connect: connection refused]
2023/06/18 15:48:41.643473 callx.go:163: [WARNING] get.client.error[dial tcp 192.168.3.113:8801: connect: connection refused]
2023/06/18 15:48:41.652513 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 +0x153
cli/cmd.RspOK(...)
/root/xenon-master/src/cli/cmd/common.go:41
cli/cmd.mysqlDoBackupCommandFn(0xc0000fe000, 0xc0000ec200, 0x0, 0x1)
/root/xenon-master/src/cli/cmd/mysql.go:584 +0x481
vendor/github.com/spf13/cobra.(*Command).execute(0xc0000fe000, 0xc0000ec1e0, 0x1, 0x1, 0xc0000fe000, 0xc0000ec1e0)
/root/xenon-master/src/vendor/github.com/spf13/cobra/command.go:603 +0x22e
vendor/github.com/spf13/cobra.(*Command).ExecuteC(0xc7f800, 0x1, 0xc0000e1f78, 0x40746f)
/root/xenon-master/src/vendor/github.com/spf13/cobra/command.go:689 +0x2bc
vendor/github.com/spf13/cobra.(*Command).Execute(...)
/root/xenon-master/src/vendor/github.com/spf13/cobra/command.go:648
main.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"
},
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