本篇内容介绍了“怎么在k8s上部署MySQL 8.0 MGR”的有关知识，在实际案例的操作过程中，不少人都会遇到这样的困境，接下来就让小编带领大家学习一下如何处理这些情况吧！希望大家仔细阅读，能够学有所成！

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一。环境概述

     k8s环境：1台master节点，3台node节点。

      在三个节点上搭建MGR集群。mysql的数据文件是挂载在本地存储，在镜像制作完成后，需要把初始化后的数据文件copy到三个节点本地的挂载点/data/mysql/data/，另外需要修改auto.cnf里面的uuid，让三个节点的uuid不同。

二。搭建步骤

1. 制作mysql 8.0.15镜像

   此步骤略过，参照mysql官方的二进制包安装步骤， https://dev.mysql.com/doc/refman/8.0/en/binary-installation.html。   安装完毕后制作成镜像。

2. 准备生成三个节点pod的相关yaml文件。

   ---创建namespace的文件namespace.yaml:

   apiVersion: v1
   kind: Namespace
   metadata:
     name: mysqldb
   

   ---节点1的configmap文件mysql-mgr-cnf-0.yaml：

   apiVersion: v1
   data:
     mysql-mgr-0.cnf: |
       [mysqld]
       port = 3306
       character_set_server = utf8
       socket = /tmp/mysql.sock
       basedir = /usr/local/mysql
       log-error = /data/mysql/data/mysql.err
       pid-file = /data/mysql/data/mysql.pid
       datadir = /data/mysql/data
       server_id = 092832
       log_bin = mysql-bin
       relay-log = relay-bin
       #back_log = 500
       #max_connections = 3000
       #wait_timeout = 5022397
       interactive_timeout = 5022397
       max_connect_errors = 1000
       relay-log-recovery=1
       #max_allowed_packet = 32M
       sort_buffer_size = 4M
       read_buffer_size = 4M
       join_buffer_size = 8M
       thread_cache_size = 64
       #tmp_table_size = 256M
       log_slave_updates=1
       long_query_time = 1
       slow_query_log = 1
       slow_query_log_file = /data/mysql/data/slow_sql.log
       skip-name-resolve
       sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
       innodb_buffer_pool_size=700M
       #innodb_data_file_path = ibdata1:1024M:autoextend
       innodb_flush_log_at_trx_commit=1
       innodb_log_buffer_size = 16M
       innodb_log_file_size = 256M
       innodb_log_files_in_group = 2
       innodb_max_dirty_pages_pct = 50
       sync_binlog=1
       master_info_repository=TABLE
       relay_log_info_repository=TABLE
       log_timestamps=SYSTEM
       gtid_mode = ON
       enforce_gtid_consistency = ON
       master_info_repository = TABLE
       relay_log_info_repository = TABLE
       log_slave_updates = ON
       binlog_checksum = NONE
       log_slave_updates = ON
       slave_parallel_type=LOGICAL_CLOCK
       slave_parallel_workers=8
       slave-preserve-commit-order=on
       #group_replication_compression_threshold=200000
       transaction_write_set_extraction = XXHASH64
       loose-group_replication_group_name="01e5fb97-be64-41f7-bafd-3afc7a6ab555"
       loose-group_replication_start_on_boot=off
       loose-group_replication_local_address="mysql-mgr-0.mgrtest.mysqldb.svc.cluster.local.:13306"
       loose-group_replication_group_seeds="mysql-mgr-0.mgrtest.mysqldb.svc.cluster.local.:13306,mysql-mgr-1.mgrtest.mysqldb.svc.cluster.local.:13306,mysql-mgr-2.mgrtest.mysqldb.svc.cluster.local.:13306"
       loose-group_replication_bootstrap_group = off
       loose-group_replication_ip_whitelist='10.244.0.0/16,172.17.0.0/16,10.229.0.0/16,10.228.0.0/16'
       report_host = mysql-mgr-0.mgrtest.mysqldb.svc.cluster.local
       [mysqldump]
       quick
       max_allowed_packet = 32M
   kind: ConfigMap
   metadata:
     name: mysql-mgr-0-cnf
     namespace: mysqldb

   ---节点2的configmap文件mysql-mgr-cnf-1.yaml：

   apiVersion: v1
   data:
     mysql-mgr-1.cnf: |
       [mysqld]
       port = 3306
       character_set_server = utf8
       socket = /tmp/mysql.sock
       basedir = /usr/local/mysql
       log-error = /data/mysql/data/mysql.err
       pid-file = /data/mysql/data/mysql.pid
       datadir = /data/mysql/data
       server_id = 092231
       log_bin = mysql-bin
       relay-log = relay-bin
       #back_log = 500
       #max_connections = 3000
       #wait_timeout = 5022397
       interactive_timeout = 5022397
       max_connect_errors = 1000
       relay-log-recovery=1
       #max_allowed_packet = 32M
       sort_buffer_size = 4M
       read_buffer_size = 4M
       join_buffer_size = 8M
       thread_cache_size = 64
       #tmp_table_size = 256M
       log_slave_updates=1
       long_query_time = 1
       slow_query_log = 1
       slow_query_log_file = /data/mysql/data/slow_sql.log
       skip-name-resolve
       sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
       innodb_buffer_pool_size=700M
       #innodb_data_file_path = ibdata1:1024M:autoextend
       innodb_flush_log_at_trx_commit=1
       innodb_log_buffer_size = 16M
       innodb_log_file_size = 256M
       innodb_log_files_in_group = 2
       innodb_max_dirty_pages_pct = 50
       sync_binlog=1
       master_info_repository=TABLE
       relay_log_info_repository=TABLE
       log_timestamps=SYSTEM
       gtid_mode = ON
       enforce_gtid_consistency = ON
       master_info_repository = TABLE
       relay_log_info_repository = TABLE
       log_slave_updates = ON
       binlog_checksum = NONE
       log_slave_updates = ON
       slave_parallel_type=LOGICAL_CLOCK
       slave_parallel_workers=8
       slave-preserve-commit-order=on
       #group_replication_compression_threshold=200000
       transaction_write_set_extraction = XXHASH64
       loose-group_replication_group_name="01e5fb97-be64-41f7-bafd-3afc7a6ab555"
       loose-group_replication_start_on_boot=off
       loose-group_replication_local_address="mysql-mgr-1.mgrtest.mysqldb.svc.cluster.local.:13306"
       loose-group_replication_group_seeds="mysql-mgr-0.mgrtest.mysqldb.svc.cluster.local.:13306,mysql-mgr-1.mgrtest.mysqldb.svc.cluster.local.:13306,mysql-mgr-2.mgrtest.mysqldb.svc.cluster.local.:13306"
       loose-group_replication_bootstrap_group = off
       loose-group_replication_ip_whitelist='10.244.0.0/16,172.17.0.0/16,10.229.0.0/16,10.228.0.0/16'
       report_host = mysql-mgr-1.mgrtest.mysqldb.svc.cluster.local
       [mysqldump]
       quick
       max_allowed_packet = 32M
   kind: ConfigMap
   metadata:
     name: mysql-mgr-1-cnf
     namespace: mysqldb

   ---节点3的configmap文件mysql-mgr-cnf-2.yaml：

   apiVersion: v1
   data:
     mysql-mgr-2.cnf: |
       [mysqld]
       port = 3306
       character_set_server = utf8
       socket = /tmp/mysql.sock
       basedir = /usr/local/mysql
       log-error = /data/mysql/data/mysql.err
       pid-file = /data/mysql/data/mysql.pid
       datadir = /data/mysql/data
       server_id = 092132
       log_bin = mysql-bin
       relay-log = relay-bin
       #back_log = 500
       #max_connections = 3000
       #wait_timeout = 5022397
       interactive_timeout = 5022397
       max_connect_errors = 1000
       relay-log-recovery=1
       #max_allowed_packet = 32M
       sort_buffer_size = 4M
       read_buffer_size = 4M
       join_buffer_size = 8M
       thread_cache_size = 64
       #tmp_table_size = 256M
       log_slave_updates=1
       long_query_time = 1
       slow_query_log = 1
       slow_query_log_file = /data/mysql/data/slow_sql.log
       skip-name-resolve
       sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
       innodb_buffer_pool_size=700M
       #innodb_data_file_path = ibdata1:1024M:autoextend
       innodb_flush_log_at_trx_commit=1
       innodb_log_buffer_size = 16M
       innodb_log_file_size = 256M
       innodb_log_files_in_group = 2
       innodb_max_dirty_pages_pct = 50
       sync_binlog=1
       master_info_repository=TABLE
       relay_log_info_repository=TABLE
       log_timestamps=SYSTEM
       gtid_mode = ON
       enforce_gtid_consistency = ON
       master_info_repository = TABLE
       relay_log_info_repository = TABLE
       log_slave_updates = ON
       binlog_checksum = NONE
       log_slave_updates = ON
       slave_parallel_type=LOGICAL_CLOCK
       slave_parallel_workers=8
       slave-preserve-commit-order=on
       #group_replication_compression_threshold=200000
       transaction_write_set_extraction = XXHASH64
       loose-group_replication_group_name="01e5fb97-be64-41f7-bafd-3afc7a6ab555"
       loose-group_replication_start_on_boot=off
       loose-group_replication_local_address="mysql-mgr-2.mgrtest.mysqldb.svc.cluster.local.:13306"
       loose-group_replication_group_seeds="mysql-mgr-0.mgrtest.mysqldb.svc.cluster.local.:13306,mysql-mgr-1.mgrtest.mysqldb.svc.cluster.local.:13306,mysql-mgr-2.mgrtest.mysqldb.svc.cluster.local.:13306"
       loose-group_replication_bootstrap_group = off
       loose-group_replication_ip_whitelist='10.244.0.0/16,172.17.0.0/16,10.229.0.0/16,10.228.0.0/16'
       report_host = mysql-mgr-2.mgrtest.mysqldb.svc.cluster.local
       [mysqldump]
       quick
       max_allowed_packet = 32M
   kind: ConfigMap
   metadata:
     name: mysql-mgr-2-cnf
     namespace: mysqldb
   
   ----节点1的pod的yaml文件:
   apiVersion: v1
   kind: Pod
   metadata:
     name: mysql-mgr-0
     namespace: mysqldb
     labels:
       name: mysql-mgr
   spec:
     affinity:
       nodeAffinity:
         requiredDuringSchedulingIgnoredDuringExecution:
           nodeSelectorTerms:
             - matchExpressions:
               - key: mysqlrole
                 operator: In
                 values: ["mysql-mgr-0"]
     hostname: mysql-mgr-0
     subdomain: mgrtest
     containers:
     - image: 172.16.110.102:5000/mysql8.0:latest
       name: mysql-mgr-0
       imagePullPolicy: IfNotPresent
       command: [ "/bin/bash", "-ce", "cd /usr/local/mysql && bin/mysqld_safe --defaults-file=/etc/my.cnf && tail -f /dev/null" ]
       #env:
       #- name: MYSQL_ROOT_PASSWORD
       #  value: noc-mysql
       ports:
         - containerPort: 3306
       volumeMounts:
       - name: tz-config
         mountPath: /etc/localtime
       - name: mysql-data
         mountPath: /data/mysql/data/
       - name: mysql-config
         mountPath: /etc/my.cnf
         subPath: my.cnf
       env:
       - name: INNODB_BUFFER_POOL_SIZE
         value: 500M
       #- name: REPORT_HOST
       #  value: mysql-mgr-0.mgrtest.mysqldb.svc.cluster.local
     volumes:
       - name: tz-config
         hostPath:
           path: /etc/localtime
       - name: mysql-data
         hostPath:
           path: /data/mysql/data/
       - name: mysql-config
         configMap:
           name: mysql-mgr-0-cnf
           items:
             - key: mysql-mgr-0.cnf
               path: my.cnf
   ----节点2的pod的yaml文件:

   apiVersion: v1
   kind: Pod
   metadata:
     name: mysql-mgr-1
     namespace: mysqldb
     labels:
       name: mysql-mgr
   spec:
     affinity:
       nodeAffinity:
         requiredDuringSchedulingIgnoredDuringExecution:
           nodeSelectorTerms:
             - matchExpressions:
               - key: mysqlrole
                 operator: In
                 values: ["mysql-mgr-1"]
     hostname: mysql-mgr-1
     subdomain: mgrtest
     containers:
     - image: 172.16.110.102:5000/mysql8.0:latest
       name: mysql-mgr-1
       imagePullPolicy: IfNotPresent
       command: [ "/bin/bash", "-ce", "cd /usr/local/mysql && bin/mysqld_safe --defaults-file=/etc/my.cnf && tail -f /dev/null" ]
       #env:
       #- name: MYSQL_ROOT_PASSWORD
       #  value: noc-mysql
       ports:
         - containerPort: 3306
       volumeMounts:
       - name: tz-config
         mountPath: /etc/localtime
       - name: mysql-data
         mountPath: /data/mysql/data
       - name: mysql-config
         mountPath: /etc/my.cnf
         subPath: my.cnf
       env:
       - name: INNODB_BUFFER_POOL_SIZE
         value: 500M
     volumes:
       - name: tz-config
         hostPath:
           path: /etc/localtime
       - name: mysql-data
         hostPath:
           path: /data/mysql/data/
       - name: mysql-config
         configMap:
           name: mysql-mgr-1-cnf
           items:
             - key: mysql-mgr-1.cnf
               path: my.cnf
   
   ---节点3的pod的yaml文件:

   apiVersion: v1
   kind: Pod
   metadata:
     name: mysql-mgr-2
     namespace: mysqldb
     labels:
       name: mysql-mgr
   spec:
     affinity:
       nodeAffinity:
         requiredDuringSchedulingIgnoredDuringExecution:
           nodeSelectorTerms:
             - matchExpressions:
               - key: mysqlrole
                 operator: In
                 values: ["mysql-mgr-2"]
     hostname: mysql-mgr-2
     subdomain: mgrtest
     containers:
     - image: 172.16.110.102:5000/mysql8.0:latest
       name: mysql-mgr-2
       imagePullPolicy: IfNotPresent
       command: [ "/bin/bash", "-ce", "cd /usr/local/mysql && bin/mysqld_safe --defaults-file=/etc/my.cnf && tail -f /dev/null" ]
       #env:
       #- name: MYSQL_ROOT_PASSWORD
       #  value: noc-mysql
       ports:
         - containerPort: 3306
       volumeMounts:
       - name: tz-config
         mountPath: /etc/localtime
       - name: mysql-data
         mountPath: /data/mysql/data
       - name: mysql-config
         mountPath: /etc/my.cnf
         subPath: my.cnf
       env:
       - name: INNODB_BUFFER_POOL_SIZE
         value: 500M
     volumes:
       - name: tz-config
         hostPath:
           path: /etc/localtime
       - name: mysql-data
         hostPath:
           path: /data/mysql/data/
       - name: mysql-config
         configMap:
           name: mysql-mgr-2-cnf
           items:
             - key: mysql-mgr-2.cnf
               path: my.cnf
   
   ---为三个pod创建的service的yaml文件

   apiVersion: v1
   kind: Service
   metadata:
     name: mgrtest
     namespace: mysqldb
   spec:
     selector:
       name: mysql-mgr
     clusterIP:   None
     ports:
     - name:   foo
       port:   3306
       targetPort: 3306
   

3.  创建namespace，service，configmap，pod

   kubectl create -f namespace.yaml

   kubectl create -f mysql-mgr-svc.yaml

   kubectl create -f mysql-mgr-cnf-0.yaml

   kubectl create -f mysql-mgr-cnf-1.yaml

   kubectl create -f mysql-mgr-cnf-2.yaml

   kubectl create -f mysql-mgr-0-pod.yaml

   kubectl create -f mysql-mgr-1-pod.yaml

   kubectl create -f mysql-mgr-2-pod.yaml

   创建后如下图所示:

   

4.  配置节点1：

   root@dkm:/app/mgr# kubectl exec -it mysql-mgr-0 -n mysqldb /bin/bash

   root@mysql-mgr-0:/# /usr/local/mysql/bin/mysql -uroot -p

   alter user 'root'@'localhost' identified by 'Mysql123!@#';
   set sql_log_bin=0;
   create user rpl_user@'%' identified by 'Rpl_pass@123';
   grant replication slave on *.* to rpl_user@'%';
   flush privileges;
   set sql_log_bin=1;
   change master to master_user='rpl_user',master_password='Rpl_pass@123' for channel 'group_replication_recovery';
   install PLUGIN group_replication SONAME 'group_replication.so';
   
   reset master;
   set global group_replication_single_primary_mode=FALSE;
   set global group_replication_enforce_update_everywhere_checks=TRUE;
   set global group_replication_bootstrap_group=ON;
   start group_replication;
   set global group_replication_bootstrap_group=OFF;
   select * from performance_schema.replication_group_members;
   

5. 配置节点2：

   set sql_log_bin=0;
   create user rpl_user@'%' identified by 'Rpl_pass@123';
   grant replication slave on *.* to rpl_user@'%';
   flush privileges;
   set sql_log_bin=1;
   change master to master_user='rpl_user',master_password='Rpl_pass@123' for channel 'group_replication_recovery';
   install PLUGIN group_replication SONAME 'group_replication.so';
   
   reset master;
   set global group_replication_single_primary_mode=FALSE;
   set global group_replication_enforce_update_everywhere_checks=TRUE;
   set global group_replication_recovery_get_public_key=on;
   start group_replication;
   select * from performance_schema.replication_group_members;

   

6.   配置节点3：

   set sql_log_bin=0;
   create user rpl_user@'%' identified by 'Rpl_pass@123';
   grant replication slave on *.* to rpl_user@'%';
   flush privileges;
   set sql_log_bin=1;
   change master to master_user='rpl_user',master_password='Rpl_pass@123' for channel 'group_replication_recovery';
   install PLUGIN group_replication SONAME 'group_replication.so';
   
   reset master;
   set global group_replication_single_primary_mode=FALSE;
   set global group_replication_enforce_update_everywhere_checks=TRUE;
   set global group_replication_recovery_get_public_key=on;
   start group_replication;
   select * from performance_schema.replication_group_members;

   

    

7. 总结：

   （1）节点之间是通过域名互相通讯，域名的构成: hostname.service.namespace.svc.cluster.local.

   （2）注意在每个节点的配置文件里配置report_host为该节点的域名，也就是hostname.service.namespace.svc.cluster.local。否则会报错：

   2019-04-10T09:16:53.607069+08:00 55 [ERROR] [MY-010584] [Repl] Slave I/O for channel 'group_replication_recovery': error connecting to master 'rpl_user@mysql-mgr-0:3306' - retry-time: 60  retries: 1, Error_code: MY-002005
   ...

   2019-04-10T09:17:53.682099+08:00 24 [ERROR] [MY-011582] [Repl] Plugin group_replication reported: 'There was an error when connecting to the donor server. Please check that group_replication_recovery channel credentials and all MEMBER_HOST column values of performance_schema.replication_group_members table are correct and DNS resolvable.'

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