mysql8.0使用pxc实现高可用

环境准备

准备三台虚拟机，其对应的主机名和IP地址为

pxc-1	192.168.190.129
pxc-2	192.168.190.133
pxc-3	192.168.190.134

解析,都要做解析

测试

下载pxc的安装包，

官网：https://www.percona.com/downloads

选择8.0的版本并下载，之后上传到虚拟机

下载 qpress-11-1.el8.x86_64.rpm

https://repo.percona.com/yum/release/8/RPMS/x86_64/z

之后同样上传到虚拟机

解压

部署

在虚拟机安装

[root@pxc-2 ~]# yum install *.rpm /root -y

初始化数据库,在pxc-2和pxc-3修改server-id为2和3就可以了

[root@pxc-1 ~]# vim /etc/my.cnf

启动数据库

[root@pxc-1 ~]# systemctl start mysqld

登陆数据库后修改密码

授权用户

创建集群

修改配置参数

[root@pxc-1 ~]# vim /etc/my.cnf

pxc-2和pxc-3同理，但只修改 wsrep_node_name（为本主机名），wsrep_node_address（为本主机IP）

将引导服务mysql目录下的*.pem拷贝给其他服务器

关闭数据库，都关

[root@pxc-1 ~]# systemctl stop mysql.service

第一个节点需要以引导模式启动：

接着在第二和第三个节点上正常启动数据库服务

查看

mysql> SHOW STATUS LIKE 'wsrep%';
+----------------------------------+-------------------------------------------                                                                                                    -------------------------------------------------------------------------------                                                                                                    ----------------------+
| Variable_name                    | Value                                                                                                                                                                                                                                                                                                                                                  |
+----------------------------------+-------------------------------------------                                                                                                    -------------------------------------------------------------------------------                                                                                                    ----------------------+
| wsrep_local_state_uuid           | 7b513b9c-e6cb-11ef-acb6-f2f80e7c1599                                                                                                                                                                                                                                                                                                                   |
| wsrep_protocol_version           | 10                                                                                                                                                                                                                                                                                                                                                     |
| wsrep_last_applied               | 16                                                                                                                                                                                                                                                                                                                                                     |
| wsrep_last_committed             | 16                                                                                                                                                                                                                                                                                                                                                     |
| wsrep_monitor_status (L/A/C)     | [ (2, 2), (16, 16), (16, 16) ]                                                                                                                                                                                                                                                                                                                         |
| wsrep_replicated                 | 0                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_replicated_bytes           | 0                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_repl_keys                  | 0                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_repl_keys_bytes            | 0                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_repl_data_bytes            | 0                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_repl_other_bytes           | 0                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_received                   | 2                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_received_bytes             | 152                                                                                                                                                                                                                                                                                                                                                    |
| wsrep_local_commits              | 0                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_local_cert_failures        | 0                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_local_replays              | 0                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_local_send_queue           | 0                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_local_send_queue_max       | 1                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_local_send_queue_min       | 0                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_local_send_queue_avg       | 0                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_local_recv_queue           | 0                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_local_recv_queue_max       | 2                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_local_recv_queue_min       | 0                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_local_recv_queue_avg       | 0.5                                                                                                                                                                                                                                                                                                                                                    |
| wsrep_local_cached_downto        | 1                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_flow_control_paused_ns     | 0                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_flow_control_paused        | 0                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_flow_control_sent          | 0                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_flow_control_recv          | 0                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_flow_control_active        | false                                                                                                                                                                                                                                                                                                                                                  |
| wsrep_flow_control_requested     | false                                                                                                                                                                                                                                                                                                                                                  |
| wsrep_flow_control_interval      | [ 100, 100 ]                                                                                                                                                                                                                                                                                                                                           |
| wsrep_flow_control_interval_low  | 100                                                                                                                                                                                                                                                                                                                                                    |
| wsrep_flow_control_interval_high | 100                                                                                                                                                                                                                                                                                                                                                    |
| wsrep_flow_control_status        | OFF                                                                                                                                                                                                                                                                                                                                                    |
| wsrep_cert_deps_distance         | 0                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_apply_oooe                 | 0                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_apply_oool                 | 0                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_apply_window               | 0                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_apply_waits                | 0                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_commit_oooe                | 0                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_commit_oool                | 0                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_commit_window              | 0                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_local_state                | 4                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_local_state_comment        | Synced                                                                                                                                                                                                                                                                                                                                                 |
| wsrep_cert_index_size            | 0                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_cert_bucket_count          | 1                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_gcache_pool_size           | 4432                                                                                                                                                                                                                                                                                                                                                   |
| wsrep_causal_reads               | 0                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_cert_interval              | 0                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_open_transactions          | 0                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_open_connections           | 0                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_ist_receive_status         |                                                                                                                                                                                                                                                                                                                                                        |
| wsrep_ist_receive_seqno_start    | 0                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_ist_receive_seqno_current  | 0                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_ist_receive_seqno_end      | 0                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_incoming_addresses         | 192.168.190.129:3306                                                                                                                                                                                                                                                                                                                                   |
| wsrep_cluster_weight             | 1                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_desync_count               | 0                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_evs_delayed                |                                                                                                                                                                                                                                                                                                                                                        |
| wsrep_evs_evict_list             |                                                                                                                                                                                                                                                                                                                                                        |
| wsrep_evs_repl_latency           | 2.485e-06/4.641e-06/7.737e-06/1.77919e-06/                                                                                                    5                                                                                                                                                                                                        |
| wsrep_evs_state                  | OPERATIONAL                                                                                                                                                                                                                                                                                                                                            |
| wsrep_gcomm_uuid                 | c7343249-e6d8-11ef-816f-5b945b7c8cd0                                                                                                                                                                                                                                                                                                                   |
| wsrep_gmcast_segment             | 0                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_cluster_capabilities       |                                                                                                                                                                                                                                                                                                                                                        |
| wsrep_cluster_conf_id            | 1                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_cluster_size               | 1                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_cluster_state_uuid         | 7b513b9c-e6cb-11ef-acb6-f2f80e7c1599                                                                                                                                                                                                                                                                                                                   |
| wsrep_cluster_status             | Primary                                                                                                                                                                                                                                                                                                                                                |
| wsrep_connected                  | ON                                                                                                                                                                                                                                                                                                                                                     |
| wsrep_local_bf_aborts            | 0                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_local_index                | 0                                                                                                                                                                                                                                                                                                                                                      |
| wsrep_provider_capabilities      | :MULTI_MASTER:CERTIFICATION:PARALLEL_APPLY                                                                                                    ING:TRX_REPLAY:ISOLATION:PAUSE:CAUSAL_READS:INCREMENTAL_WRITESET:UNORDERED:PREO                                                                                                    RDERED:STREAMING:NBO: |
| wsrep_provider_name              | Galera                                                                                                                                                                                                                                                                                                                                                 |
| wsrep_provider_vendor            | Codership Oy <[e-mail]> (modifie                                                                                                    d by Percona <https://percona.com/>)                                                                                                                                                                     |
| wsrep_provider_version           | 4.14(779b689)                                                                                                                                                                                                                                                                                                                                          |
| wsrep_ready                      | ON                                                                                                                                                                                                                                                                                                                                                     |
| wsrep_thread_count               | 9                                                                                                                                                                                                                                                                                                                                                      |
+----------------------------------+-------------------------------------------                                                                                                    -------------------------------------------------------------------------------                                                                                                    ----------------------+
79 rows in set (0.01 sec)

第一个节点

以引导模式来进行关闭：

systemctl stop [e-mail]

其他节点正常下线

 systemctl stop mysqld