K8S中部署mysql-ha高可用集群
作者：互联网
作者：李毓
约定：
k8s:1.18
helm:v3
mysql:5.7.13
ceph:rbd模式
按照之前的教程，先添加好仓库
[root@adm-master ~]# helm repo list
NAME URL
charts https://kubernetes.oss-cn-hangzhou.aliyuncs.com/charts
stable http://mirror.azure.cn/kubernetes/charts
aliyuncs https://apphub.aliyuncs.com
[root@adm-master ~]# helm pull aliyuncs/mysqlha
[root@adm-master ~]# tar -zxvf mysqlha-1.0.0.tgz
[root@adm-master mysqlha]# ls
Chart.yaml OWNERS README.md templates values.yaml
官方的模板里面有个坑
这里原本是没有的，要给他加上。
[root@adm-master mysqlha]# vim templates/statefulset.yaml
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: {{ template "fullname" . }}
labels:
app: {{ template "fullname" . }}
chart: "{{ template "mysqlha.chart" . }}"
release: "{{ .Release.Name }}"
heritage: "{{ .Release.Service }}"
spec:
serviceName: {{ template "fullname" . }}
replicas: {{ .Values.mysqlha.replicaCount }}
selector:
matchLabels:
app: {{ template "fullname" . }}
执行命令
[root@adm-master mysqlha]# helm install mysql . -f ./values.yaml
NAME: mysql
LAST DEPLOYED: Sat Mar 20 20:54:20 2021
NAMESPACE: default
STATUS: deployed
REVISION: 1
TEST SUITE: None
NOTES:
The MySQL cluster is comprised of 3 MySQL pods: 1 master and 2 slaves. Each instance is accessible within the cluster through:
<pod-name>.mysql-mysqlha
`mysql-mysqlha-0.mysql-mysqlha` is designated as the master and where all writes should be executed against. Read queries can be executed against the `mysql-mysqlha-readonly` service which distributes connections across all MySQL pods.
To connect to your database:
1. Obtain the root password:
kubectl get secret --namespace default mysql-mysqlha -o jsonpath="{.data.mysql-root-password}" | base64 --decode; echo
2. Run a pod to use as a client:
kubectl run mysql-client --image=mysql:5.7.13 -it --rm --restart='Never' --namespace default -- /bin/sh
3. To connect to Master service (read/write):
mysql -h mysql-mysqlha-0.mysql-mysqlha -u root -p
4. To connect to slave service (read-only):
mysql -h mysql-mysqlha-readonly -u root -p
有必要验证一下读写分离
先获取密码
进行base64反编码
[root@adm-master mysqlha]# echo -n MjIzRjBNTkFFV2hh | base64 --decode
223F0MNAEWha
[root@adm-master mysqlha]# echo -n a3FOdzZUbktGVjNq | base64 --decode
kqNw6TnKFV3j
进入容器
[root@adm-master mysqlha]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
mysql-mysqlha-0 2/2 Running 0 31m 10.244.2.227 adm-node2 <none> <none>
mysql-mysqlha-1 2/2 Running 0 30m 10.244.1.193 adm-node1 <none> <none>
mysql-mysqlha-2 2/2 Running 0 29m 10.244.2.228 adm-node2 <none> <none>
nfs-client-provisioner-cc544b949-k8n2s 1/1 Running 29 109d 10.244.1.186 adm-node1 <none> <none>
rbd-provisioner-c968dcb4b-wbhlc 1/1 Running 1 26h 10.244.1.187 adm-node1 <none> <none>
[root@adm-master mysqlha]# kubectl exec -it mysql-mysqlha-0 sh
kubectl exec [POD] [COMMAND] is DEPRECATED and will be removed in a future version. Use kubectl kubectl exec [POD] -- [COMMAND] instead.
Defaulting container name to mysql.
Use 'kubectl describe pod/mysql-mysqlha-0 -n default' to see all of the containers in this pod.
#
# mysql -h10.244.2.227 -uroot -pkqNw6TnKFV3j
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 203
Server version: 5.7.13-log MySQL Community Server (GPL)
Copyright (c) 2000, 2016, 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>
创建数据
mysql> show databases;
+------------------------+
| Database |
+------------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
| xtrabackup_backupfiles |
+------------------------+
5 rows in set (0.00 sec)
mysql> CREATE DATABASE test;
Query OK, 1 row affected (0.02 sec)
mysql> CREATE TABLE test.messages (message VARCHAR(250));
Query OK, 0 rows affected (0.06 sec)
mysql> INSERT INTO test.messages VALUES ('hello');
Query OK, 1 row affected (0.02 sec)
mysql> show databases;
+------------------------+
| Database |
+------------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
| test |
| xtrabackup_backupfiles |
+------------------------+
6 rows in set (0.00 sec)
mysql> use test;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> select * from messages;
+---------+
| message |
+---------+
| hello |
+---------+
1 row in set (0.00 sec)
# mysql -uroot -h10.1.195.242 -pkqNw6TnKFV3j
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 265
Server version: 5.7.13 MySQL Community Server (GPL)
Copyright (c) 2000, 2016, 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> show databases ;
+------------------------+
| Database |
+------------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
| test |
| xtrabackup_backupfiles |
+------------------------+
6 rows in set (0.01 sec)
标签：ha,--,root,master,mysql,adm,mysqlha,K8S 来源： https://blog.51cto.com/14783669/2667194