注：有mysql安裝在k8s集群內，集群外且通過k8s service endpoint代理外部mysql服務供內k8s內部集群訪問兩種方式，本文為第二種

一，先在k8s-node上docker安裝mysql,并遠程連接可用

1.下載mysql鏡像

[root@k8s-node1 ~]# docker pull mysql:5.7

5.7: Pulling from library/mysql

27833a3ba0a5: Pull complete

864c283b3c4b: Pull complete

cea281b2278b: Pull complete

8f856c14f5af: Pull complete

9c4f38c23b6f: Pull complete

1b810e1751b3: Pull complete

5479aaef3d30: Pull complete

1d924ec3d520: Pull complete

1ab7ae63ac60: Pull complete

08aa5f3680e9: Pull complete

a832d0a0972a: Pull complete

Digest: sha256:dba5fed182e64064b688ccd22b2f9cad4ee88608c82f8cff21e17bab8da72b81

Status: Downloaded newer imagefor mysql:5.7[root@k8s-node1 ~]# docer images-bash: docer: 未找到命令

[root@k8s-node1 ~]# docker images

REPOSITORY TAG IMAGE ID CREATED SIZE

mytomcat v8 f1332ae3f57012days ago 463MB

mytomcat v9 f1332ae3f57012days ago 463MB

tomcat8 f1332ae3f570 12days ago 463MB

mysql5.7 98455b9624a9 2weeks ago 372MB

k8s.gcr.io/kube-proxy v1.14.0 5cd54e388aba 2 weeks ago 82.1MB

k8s.gcr.io/kube-controller-manager v1.14.0 b95b1efa0436 2weeks ago 158MB

k8s.gcr.io/kube-scheduler v1.14.0 00638a24688b 2 weeks ago 81.6MB

k8s.gcr.io/kube-apiserver v1.14.0 ecf910f40d6e 2weeks ago 210MB

quay.io/coreos/flannel v0.11.0-amd64 ff281650a721 2 months ago 52.6MB

k8s.gcr.io/coredns 1.3.1 eb516548c180 2 months ago 40.3MB

k8s.gcr.io/etcd 3.3.10 2c4adeb21b4f 4months ago 258MB

k8s.gcr.io/pause 3.1 da86e6ba6ca1 15months ago 742kB

[root@k8s-node1 ~]#

2.啟動，-v

[root@k8s-node1 mysql]# docker run -d -p 3306:3306 -v /var/local/mysql:/var/lib/mysql -e MYSQL_ROOT_PASSWORD=mysql --name docker-mysql mysql:5.787b7410ea379136b3743e194bb312b1bb6fe02abe73e706e04c68856aecc507a

[root@k8s-node1 mysql]#

進入mysql container

[root@k8s-node1 mysql]# docker ps -a

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

87b7410ea379 mysql:5.7 "docker-entrypoint.s…" About a minute ago Up About a minute 0.0.0.0:3306->3306/tcp, 33060/tcp docker-mysql[root@k8s-node1 mysql]# docker exec -it 87b7410ea379 /bin/bash

root@87b7410ea379:/# mysql -uroot -pmysql

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 connectionid is 2Server version:5.7.25MySQL 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 clearthe current input statement.

mysql>

mysql> exit

Bye

root@87b7410ea379:/# exit

exit

[root@k8s-node1 mysql]#

3.遠程連接

二，到k8s master創建server,endpoint代理訪問

1.到k8s-master上驗證是否可以連接，前提是已安裝mysql客戶端(如果沒有centos7安裝mysql客戶端)

[root@k8s-master master]# mysql -h192.168.111.131 -P3306 -uroot -pmysql

Welcome to the MariaDB monitor. Commands end with ; or \g.

Your MySQL connectionid is 12Server version:5.7.25MySQL Community Server (GPL)

Copyright (c)2000, 2018, Oracle, MariaDB Corporation Ab and others.

Type'help;' or '\h' for help. Type '\c' to clearthe current input statement.

MySQL [(none)]>exit

Bye

[root@k8s-master master]#

2.創建mysql-out.svc.yaml文件

[root@k8s-master ~]# cat mysql-out-svc.yaml

apiVersion: v1

kind: Service

metadata:

name: mysql-out-svc

spec:

ports:- port: 3306protocol: TCP

targetPort:3306

---apiVersion: v1

kind: Endpoints

metadata:

name: mysql-out-svc

subsets:-addresses:- ip: "192.168.111.131"ports:- port: 3306[root@k8s-master ~]#

在service中,各項配置意義

spec:

type: NodePort????? #這里代表是NodePort類型的,另外還有ingress,LoadBalancer

ports:

- port: 80????????? #這里的端口和clusterIP(kubectl describe service service-hello中的IP的port)對應，即在集群中所有機器上curl 10.98.166.242:80可訪問發布的應用服務。

targetPort: 8080? #端口一定要和container暴露出來的端口對應，nodejs暴露出來的端口是8081，所以這里也應是8081

protocol: TCP

nodePort: 31111?? # 所有的節點都會開放此端口，此端口供外部調用。

selector:

run: hello???????? #這里選擇器一定要選擇容器的標簽，之前寫name:kube-node是錯的。

3.啟動service

[root@k8s-master ~]# kubectl create -f mysql-out-svc.yaml

service/mysql-out-svc created

endpoints/mysql-out-svc created

[root@k8s-master ~]# kubectl get services -o wide

NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE SELECTOR

kubernetes ClusterIP10.96.0.1 443/TCP 8d mysql-out-svc ClusterIP 10.111.241.185 3306/TCP 18s service-hello NodePort 10.98.166.242 80:31111/TCP 8d run=hello

[root@k8s-master ~]# kubectl get endpoints -o wide

NAME ENDPOINTS AGE

kubernetes192.168.111.130:64438d

mysql-out-svc 192.168.111.131:330637s

service-hello 10.244.1.36:8080,10.244.1.37:8080 8d

因為使用的是k8s集群外部mysql服務，然后用service代理，讓k8s集群內的其它service(如service-hello)可通過 cluster-ip:port(10.111.241.185:3306)來訪問外部的mysql服務

所以此外并沒有生成mysql?的pod

[root@k8s-master ~]# kubectl get pods -o wide

NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES

hello-5cd4456b66-gstq6 1/1 Running 1 7d17h 10.244.1.36 k8s-node1 hello-5cd4456b66-sb5px 1/1 Running 1 7d17h 10.244.1.37 k8s-node1

4.在k8s-master上也可以通過?cluster-ip:port(10.111.241.185:3306)來訪問外部的mysql服務

[root@k8s-master ~]# mysql -h10.111.241.185 -P3306 -uroot -pmysql

Welcome to the MariaDB monitor. Commands end with ; or \g.

Your MySQL connectionid is 13Server version:5.7.25MySQL Community Server (GPL)

Copyright (c)2000, 2018, Oracle, MariaDB Corporation Ab and others.

Type'help;' or '\h' for help. Type '\c' to clearthe current input statement.

MySQL [(none)]>

到此，k8s上安裝msyql完成

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