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怎么在k8s上部署mysql8.0MGR

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一。环境概述

k8s环境：1台master节点，3台node节点。

怎么在k8s上部署mysql 8.0 MGR

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

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。
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
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:
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;
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;
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;
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.'

“怎么在k8s上部署mysql 8.0 MGR”的内容就介绍到这里了，感谢大家的阅读。如果想了解更多行业相关的知识可以关注创新互联网站，小编将为大家输出更多高质量的实用文章！

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