k8s部署mysql服务(RC部署)
编写mysql-rc.yaml文件apiVersion: v1kind: ReplicationControllermetadata:name: mysql-rclabels:name: mysql-rcspec:replicas: 1selector:name: mysql-podtemplate:metadata:labels:name: mysql-podspec:conta
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编写mysql-rc.yaml文件
apiVersion: v1
kind: ReplicationController
metadata:
name: mysql-rc
labels:
name: mysql-rc
spec:
replicas: 1
selector:
name: mysql-pod
template:
metadata:
labels:
name: mysql-pod
spec:
containers:
- name: mysql
image: mysql:5.7
imagePullPolicy: IfNotPresent
ports:
- containerPort: 3306
volumeMounts:
- mountPath: /var/lib/mysql
name: mydata
env:
- name: MYSQL_ROOT_PASSWORD
value: "root"
volumes:
- name: mydata
hostPath:
path: /root/mysql/data创建mysql-rc pod
[root@master mysql]# kubectl apply -f mysql-rc.yaml -n gridcloud
replicationcontroller/mysql-rc created
编写mysql-service.yaml文件
apiVersion: v1
kind: Service
metadata:
name: mysql-svc
labels:
name: mysql-svc
spec:
type: NodePort
ports:
- port: 3306
targetPort: 3306
nodePort: 30306
selector:
name: mysql-pod启动mysql-service pod
[root@master mysql]# kubectl apply -f mysql-service.yaml -n gridcloud
service/mysql-svc created
查看我们的pod情况
[root@master mysql]# kubectl get pods -n gridcloud
NAME READY STATUS RESTARTS AGE
mysql-rc-d2whh 0/1 ContainerCreating 0 59s
显示正在创建并查看该pod信息
[root@master mysql]# kubectl describe pod mysql-rc-d2whh -n gridcloud
Name: mysql-rc-d2whh
Namespace: gridcloud
Priority: 0
Node: node2/192.168.0.153
Start Time: Sat, 30 May 2020 00:28:52 +0800
Labels: name=mysql-pod
Annotations: <none>
Status: Running
IP: 10.244.2.49
IPs:
IP: 10.244.2.49
Controlled By: ReplicationController/mysql-rc
Containers:
mysql:
Container ID: docker://64769dcdc408ecd690707aa4ce56bc6ddfed7b41e46cf3c7f8d99461788944d1
Image: mysql:5.7
Image ID: docker-pullable://mysql@sha256:d16d9ef7a4ecb29efcd1ba46d5a82bda3c28bd18c0f1e3b86ba54816211e1ac4
Port: 3306/TCP
Host Port: 0/TCP
State: Running
Started: Sat, 30 May 2020 00:30:35 +0800
Ready: True
Restart Count: 0
Environment:
MYSQL_ROOT_PASSWORD: root
Mounts:
/var/lib/mysql from mydata (rw)
/var/run/secrets/kubernetes.io/serviceaccount from default-token-sq8nw (ro)
Conditions:
Type Status
Initialized True
Ready True
ContainersReady True
PodScheduled True
Volumes:
mydata:
Type: HostPath (bare host directory volume)
Path: /root/mysql/data
HostPathType:
default-token-sq8nw:
Type: Secret (a volume populated by a Secret)
SecretName: default-token-sq8nw
Optional: false
QoS Class: BestEffort
Node-Selectors: <none>
Tolerations: node.kubernetes.io/not-ready:NoExecute for 300s
node.kubernetes.io/unreachable:NoExecute for 300s
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Scheduled 2m38s default-scheduler Successfully assigned gridcloud/mysql-rc-d2whh to node2
Normal Pulling 2m38s kubelet, node2 Pulling image "mysql:5.7"
Normal Pulled 57s kubelet, node2 Successfully pulled image "mysql:5.7"
Normal Created 56s kubelet, node2 Created container mysql
Normal Started 56s kubelet, node2 Started container mysql
最后显示创建成功，最后在查询状态
[root@master mysql]# kubectl get pods -n gridcloud
NAME READY STATUS RESTARTS AGE
mysql-rc-d2whh 1/1 Running 0 2m48s显示running状态，表示创建成功，并查看详细信息显示分配在node2上，如下
[root@master mysql]# kubectl get pods -n gridcloud -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
mysql-rc-d2whh 1/1 Running 0 5m28s 10.244.2.49 node2 <none> <none>登录数据库，并创建一个库，做测试
[root@manage-host bin]# mysql -uroot -h 192.168.0.155 -P 30306 -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 3
Server version: 5.7.30 MySQL Community Server (GPL)
Copyright (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> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
+--------------------+
4 rows in set (0.00 sec)
mysql> create database test;
Query OK, 1 row affected (0.00 sec)
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
| test |
+--------------------+
5 rows in set (0.00 sec)
mysql> quit
Bye
最后我们看我们挂载的路径下有我们的数据库数据信息，此时在node2上查看（前后多了一个test）
[root@node2 ~]# ls /root/mysql/data/
auto.cnf ca.pem client-key.pem ibdata1 ib_logfile1 mysql private_key.pem server-cert.pem sys
ca-key.pem client-cert.pem ib_buffer_pool ib_logfile0 ibtmp1 performance_schema public_key.pem server-key.pem
[root@node2 ~]# cd /root/mysql/data/
[root@node2 data]# ls
auto.cnf ca.pem client-key.pem ibdata1 ib_logfile1 mysql private_key.pem server-cert.pem sys
ca-key.pem client-cert.pem ib_buffer_pool ib_logfile0 ibtmp1 performance_schema public_key.pem server-key.pem test接着我们就重启下pod看看我们的数据库信息是否可查
[root@master mysql]# kubectl get pods -n gridcloud
NAME READY STATUS RESTARTS AGE
mysql-rc-d2whh 1/1 Running 0 72m
[root@master mysql]# kubectl delete pod mysql-rc-d2whh -n gridcloud
pod "mysql-rc-d2whh" deleted
[root@master mysql]# kubectl apply -f mysql-service.yaml -n gridcloud
service/mysql-svc unchanged然后我们重新登录数据库查看刚刚创建的库是否存在
[root@manage-host bin]# mysql -uroot -h 192.168.0.155 -P 30306 -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.7.30 MySQL Community Server (GPL)
Copyright (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> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
| test |
+--------------------+
5 rows in set (0.00 sec)
显示我们的数据没丢失，至此数据库部署成功
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