k8s-v1.2.3部署mysql-8服务

一、环境准备

CentOS Linux release 7.7.1908 (Core) 3.10.0-1062.el7.x86_64

kubeadm-1.22.3-0.x86_64

kubelet-1.22.3-0.x86_64

kubectl-1.22.3-0.x86_64

kubernetes-cni-0.8.7-0.x86_64

主机名	IP	VIP
k8s-master01	192.168.30.106	192.168.30.115
k8s-master02	192.168.30.107
k8s-master03	192.168.30.108
k8s-node01	192.168.30.109
k8s-node02	192.168.30.110
k8s-nfs	192.168.30.114

二、配置好PV和PVC

这里我就不再详细说明，可以参考我上篇（归海听雪：k8s-1.22.3版本中使用持久化卷之StorageClass+NFS）

三、部署mysql8服务

1、把mysql8配置文件放到configmap

这里面的一些配置参数，可以根据自已的实际情况进行修改优化

vim mysql-configmap.yaml

---
apiVersion: v1
kind: ConfigMap
metadata:name: mysql-confignamespace: k8s-mysqllabels:app: mysql
data:my.cnf: |-[client]default-character-set=utf8mb4[mysql]default-character-set=utf8mb4[mysqld]max_connections = 2000secure_file_priv=/var/lib/mysqlsql_mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTIONskip-name-resolveopen_files_limit = 65535table_open_cache = 128log_error = /var/lib/mysql/mysql-error.log #错误日志路径slow_query_log = 1long_query_time = 1 #慢查询时间 超过1秒则为慢查询slow_query_log_file = /var/lib/mysql/mysql-slow.logdefault-storage-engine = InnoDB #默认存储引擎innodb_file_per_table = 1innodb_open_files = 500innodb_buffer_pool_size = 64Minnodb_write_io_threads = 4innodb_read_io_threads = 4innodb_thread_concurrency = 0innodb_purge_threads = 1innodb_flush_log_at_trx_commit = 2innodb_log_buffer_size = 2Minnodb_log_file_size = 32Minnodb_log_files_in_group = 3innodb_max_dirty_pages_pct = 90innodb_lock_wait_timeout = 120bulk_insert_buffer_size = 8Mmyisam_sort_buffer_size = 8Mmyisam_max_sort_file_size = 10Gmyisam_repair_threads = 1interactive_timeout = 28800wait_timeout = 28800[mysqldump]quickmax_allowed_packet = 16M #服务器发送和接受的最大包长度[myisamchk]key_buffer_size = 8Msort_buffer_size = 8Mread_buffer = 4Mwrite_buffer = 4M

kubectl apply -f mysql-configmap.yaml

2、生成mysql-statefulset文件

vim mysql-statefulset.yaml

apiVersion: v1
kind: Service
metadata:namespace: defaultname: mysql-headless
spec:clusterIP: None  #无头服务selector:app: mysqlports:- name: mysqlport: 3306protocol: TCP
---
apiVersion: apps/v1
kind: StatefulSet
metadata:namespace: defaultname: mysql
spec:podManagementPolicy: OrderedReady  #pod名-> 0-N,删除N->0replicas: 1revisionHistoryLimit: 10serviceName: mysql-headlessselector:matchLabels:app: mysqltemplate:metadata:  #name没写，会默认生成的labels:app: mysqlspec:containers:- name: mysqlimage: registry-op.test.cn/mysql:8.0.19ports:- containerPort: 3306name: clientenv:- name: MYSQL_ROOT_PASSWORD    ## 配置Root用户默认密码value: "112233"resources:limits:cpu: 2000mmemory: 512Mirequests:cpu: 2000mmemory: 512Mi
# health checklivenessProbe:initialDelaySeconds: 30periodSeconds: 10timeoutSeconds: 5successThreshold: 1failureThreshold: 3exec:command: ["mysqladmin", "-uroot", "-p${MYSQL_ROOT_PASSWORD}", "ping"]readinessProbe:initialDelaySeconds: 10periodSeconds: 10timeoutSeconds: 5successThreshold: 1failureThreshold: 3exec:command: ["mysqladmin", "-uroot", "-p${MYSQL_ROOT_PASSWORD}", "ping"]# health checkvolumeMounts:- name: confmountPath: /etc/mysql/conf.d/my.cnfsubPath: my.cnf- name: datamountPath: /var/lib/mysqlreadOnly: false- name: localtimereadOnly: truemountPath: /etc/localtimevolumes:- name: confconfigMap:name: mysql-configdefaultMode: 0755- name: localtimehostPath:type: Filepath: /etc/localtimeimagePullSecrets:- name: registry-op.test.cnvolumeClaimTemplates:- metadata:name: dataspec:accessModes: ["ReadWriteMany"]storageClassName: managed-nfs-storagevolumeMode: Filesystemresources:requests:storage: 20Gi

kubectl apply -f mysql-statefulset.yaml

3、设置外部访问

vim mysql-service.yaml

---
apiVersion: v1
kind: Service
metadata:name: mysqlnamespace: defaultlabels:app: mysql
spec:type: NodePortports:- name: tcpport: 3306nodePort: 32306selector:app: mysql

kubectl apply -f mysql-service.yaml

4、查看状态

# kubectl get pods|grep mysql
mysql-0                                   1/1     Running   0               15h# kubectl get svc|grep mysql
mysql            NodePort    10.96.196.95    <none>        3306:32306/TCP   15h
mysql-headless   ClusterIP   None            <none>        3306/TCP         15h

5、登录mysql验证

# kubectl exec -it mysql-0 /bin/sh -n default
# mysql -uroot -p112233
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 11172
Server version: 8.0.19 MySQL Community Server - GPLCopyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.mysql>

说明mysql8可以正常使用了

6、查看存储

# kubectl get pv|grep mysql
pvc-98be7119-fe14-4d50-9f68-a4e4031c68b0   20Gi       RWX            Retain           Bound    default/data-mysql-0             managed-nfs-storage                  15h# kubectl get pvc|grep mysql
data-mysql-0   Bound    pvc-98be7119-fe14-4d50-9f68-a4e4031c68b0   20Gi       RWX            managed-nfs-storage   15h

#登录到192.168.10.114存储上看一下数据

# ll /data/volumes/default-data-mysql-0-pvc-98be7119-fe14-4d50-9f68-a4e4031c68b0/
total 178224
drwxr-x--- 2 polkitd input     4096 Dec 28 18:34 #innodb_temp
-rw-r----- 1 polkitd input       56 Dec 28 18:34 auto.cnf
-rw-r----- 1 polkitd input  3110839 Dec 28 18:34 binlog.000001
-rw-r----- 1 polkitd input      340 Dec 28 18:36 binlog.000002
-rw-r----- 1 polkitd input       32 Dec 28 18:34 binlog.index
-rw------- 1 polkitd input     1676 Dec 28 18:34 ca-key.pem
-rw-r--r-- 1 polkitd input     1112 Dec 28 18:34 ca.pem
-rw-r--r-- 1 polkitd input     1112 Dec 28 18:34 client-cert.pem
-rw------- 1 polkitd input     1680 Dec 28 18:34 client-key.pem
-rw-r----- 1 polkitd input     5400 Dec 28 18:34 ib_buffer_pool
-rw-r----- 1 polkitd input 33554432 Dec 28 18:36 ib_logfile0
-rw-r----- 1 polkitd input 33554432 Dec 28 18:34 ib_logfile1
-rw-r----- 1 polkitd input 33554432 Dec 28 18:34 ib_logfile2
-rw-r----- 1 polkitd input 12582912 Dec 28 18:36 ibdata1
-rw-r----- 1 polkitd input 12582912 Dec 28 18:35 ibtmp1
drwxr-x--- 2 polkitd input     4096 Dec 28 18:34 mysql
-rw-r----- 1 polkitd input     3647 Dec 28 18:34 mysql-error.log
-rw-r----- 1 polkitd input      537 Dec 28 18:34 mysql-slow.log
-rw-r----- 1 polkitd input 30408704 Dec 28 18:36 mysql.ibd
drwxr-x--- 2 polkitd input     4096 Dec 28 18:34 performance_schema
-rw------- 1 polkitd input     1676 Dec 28 18:34 private_key.pem
-rw-r--r-- 1 polkitd input      452 Dec 28 18:34 public_key.pem
-rw-r--r-- 1 polkitd input     1112 Dec 28 18:34 server-cert.pem
-rw------- 1 polkitd input     1676 Dec 28 18:34 server-key.pem
drwxr-x--- 2 polkitd input     4096 Dec 28 18:34 sys
drwxr-x--- 2 polkitd input     4096 Dec 28 18:36 test
-rw-r----- 1 polkitd input 12582912 Dec 28 18:34 undo_001
-rw-r----- 1 polkitd input 10485760 Dec 28 18:36 undo_002

四、外部访问验证

找一台外部机器，安装一下mysql8的client包

1、下载mysql8包

mkdir /opt/mysql8
cd /opt/mysql8
wget   https://cdn.mysql.com/archives/mysql-8.0/mysql-8.0.16-2.el7.x86_64.rpm-bundle.tar

2、安装

tar -xf mysql-8.0.16-2.el7.x86_64.rpm-bundle.tar
rpm -ivh mysql-community-client-8.0.16-2.el7.x86_64.rpm mysql-community-libs-8.0.16-2.el7.x86_64.rpm mysql-community-common-8.0.16-2.el7.x86_64.rpm

3、验证登录mysql

前面已经配置了mysql8为nodeport访问，并且端口是32306，所以理论外部可以直接访问的

#mysql -h 192.168.30.109 -P 32306 -uroot -p112233
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 11315
Server version: 8.0.19 MySQL Community Server - GPLCopyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.mysql>

可以测试一下，把当前的pod删除，自动创建后，看一下数据库中的数据是否正常。