Kubernetes 安装 MetaLB 基于 service LoadBalancer 功能实现wordpress

综合案例：wordpress

[root@master1 metallb]# kubectl get node
NAME          STATUS   ROLES           AGE   VERSION
master1.org   Ready    control-plane   12d   v1.35.4
node1.org     Ready    <none>          12d   v1.35.4
node2.org     Ready    <none>          12d   v1.35.4
node3.org     Ready    <none>          12d   v1.35.4

#下载指定版本

METALLB_VERSION='v0.15.3'

wget https://raw.githubusercontent.com/metallb/metallb/${METALLB_VERSION}/config/manifests/metallb-native.yaml

kubectl apply -f metallb-native.yaml

#指定IP地址池

[root@master1 metallb]# cat service-metallb-IPAddressPool.yaml
apiVersion: metallb.io/v1beta1
kind: IPAddressPool
metadata:
  name: localip-pool
  namespace: metallb-system
spec:
  addresses:
  - 192.168.3.10-192.168.3.50
  autoAssign: true
  avoidBuggyIPs: true

[root@master1 metallb]# cat service-metallb-L2Advertisement.yaml
apiVersion: metallb.io/v1beta1
kind: L2Advertisement
metadata:
  name: localip-pool-l2a
  namespace: metallb-system
spec:
  ipAddressPools:
  - localip-pool
  interfaces:
  - ens33

kubectl apply -f service-metallb-IPAddressPool.yaml

kubectl apply -f service-metallb-L2Advertisement.yaml

kubectl get all -n metallb-system

[root@master1 metallb]# kubectl get all -n metallb-system
NAME                              READY   STATUS    RESTARTS   AGE
pod/controller-7f475568c5-r6b4j   1/1     Running   0          71s
pod/speaker-5d76c                 1/1     Running   0          71s
pod/speaker-lm4r7                 1/1     Running   0          71s
pod/speaker-qgp89                 1/1     Running   0          71s
pod/speaker-rj2b7                 1/1     Running   0          71s

NAME                              TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)   AGE
service/metallb-webhook-service   ClusterIP   10.105.251.51   <none>        443/TCP   71s

NAME                     DESIRED   CURRENT   READY   UP-TO-DATE   AVAILABLE   NODE SELECTOR            AGE
daemonset.apps/speaker   4         4         4       4            4           kubernetes.io/os=linux   71s

NAME                         READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/controller   1/1     1            1           71s

NAME                                    DESIRED   CURRENT   READY   AGE
replicaset.apps/controller-7f475568c5   1         1         1       71s

kubectl get IPAddressPool -n metallb-system

[root@master1 metallb]# kubectl get IPAddressPool -n metallb-system 
NAME           AUTO ASSIGN   AVOID BUGGY IPS   ADDRESSES
localip-pool   true          true              ["192.168.3.10-192.168.3.50"]

[root@master1 workload]# cat wordpress-mysql-svc-deployment.yaml
apiVersion: v1
kind: Namespace
metadata:
  name: demo
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: mysql
  namespace: demo
spec:
  replicas: 1
  selector:
    matchLabels:
      app: mysql
  template:
    metadata:
      labels:
        app: mysql
    spec:
      containers:
      - image: registry.cn-beijing.aliyuncs.com/wangxiaochun/mysql:8.0.29-oracle
        name: mysql
        env:
        - name: MYSQL_ROOT_PASSWORD
          value: "123456"
        - name: MYSQL_DATABASE
          value: "wordpress"
        - name: MYSQL_USER
          value: wordpress
        - name: MYSQL_PASSWORD
          value: "123456"
---
apiVersion: v1
kind: Service
metadata:
  name: mysql
  namespace: demo
spec:
  ports:
  - port: 3306
    protocol: TCP
    targetPort: 3306
  selector:
    app: mysql
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: wordpress
  namespace: demo
spec:
  replicas: 1
  selector:
    matchLabels:
      app: wordpress
  template:
    metadata:
      labels:
        app: wordpress
    spec:
      containers:
      - image: registry.cn-beijing.aliyuncs.com/wangxiaochun/wordpress:php8.2-apache
        name: wordpress
        env:
        - name: WORDPRESS_DB_HOST
          #value: mysql.demo.svc.cluster.local.
          value: mysql
        - name: WORDPRESS_DB_USER
          value: wordpress
        - name: WORDPRESS_DB_PASSWORD
          value: "123456"
        - name: WORDPRESS_DB_NAME
          value: wordpress
---
apiVersion: v1
kind: Service
metadata:
  name: wordpress
  namespace: demo
spec:
  ports:
  - port: 80
    protocol: TCP
    targetPort: 80
  selector:
    app: wordpress
  #type: NodePort
  type: LoadBalancer #有前提，需要部署LoadBalancer軟件

kubectl apply -f wordpress-mysql-svc-deployment.yaml

[root@master1 workload]# kubectl get pod -n demo
NAME                        READY   STATUS    RESTARTS   AGE
mysql-6d544df847-td9pw      1/1     Running   0          86s
wordpress-bdcb8c7fb-x6nzf   1/1     Running   0          86s
[root@master1 workload]# 
[root@master1 workload]# kubectl get deploy -n demo
NAME        READY   UP-TO-DATE   AVAILABLE   AGE
mysql       1/1     1            1           98s
wordpress   1/1     1            1           98s

[root@master1 workload]# kubectl get svc -n demo      
NAME        TYPE           CLUSTER-IP       EXTERNAL-IP    PORT(S)        AGE
mysql       ClusterIP      10.111.141.148   <none>         3306/TCP       2m4s
wordpress   LoadBalancer   10.102.238.141   192.168.3.11   80:30644/TCP   2m4s

[root@master1 workload]# kubectl get ep -n demo   
Warning: v1 Endpoints is deprecated in v1.33+; use discovery.k8s.io/v1 EndpointSlice
NAME        ENDPOINTS           AGE
mysql       10.244.2.160:3306   2m27s
wordpress   10.244.3.55:80      2m26s

进入 MySQL Pod 内部直接访问

进入 MySQL 容器

容器内用 localhost 连接

kubectl exec -it -n demo mysql-6d544df847-td9pw -- sh

[root@master1 workload]# kubectl exec -it -n demo mysql-6d544df847-td9pw -- sh
sh-4.4# 
sh-4.4# 
sh-4.4# mysql -u wordpress -p123456 wordpress
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 15
Server version: 8.0.29 MySQL Community Server - GPL

Copyright (c) 2000, 2022, Oracle and/or its affiliates.

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>

测试mysql

集群内 Pod 通过 Service DNS 访问

MySQL 的 Service 名为 mysql，在 demo 命名空间

完整service名称

mysql.demo.svc.cluster.local

弄个临时容器有mysql客户端命令的

kubectl run mysql-client --rm -it --image=registry.cn-beijing.aliyuncs.com/wangxiaochun/mysql:8.0.29-oracle -- bash

在容器内连接使用service名称

mysql -h mysql.demo.svc.cluster.local -u wordpress -p123456 wordpress

[root@master1 workload]# kubectl run mysql-client --rm -it --image=registry.cn-beijing.aliyuncs.com/wangxiaochun/mysql:8.0.29-oracle -- bash
All commands and output from this session will be recorded in container logs, including credentials and sensitive information passed through the command prompt.
If you don't see a command prompt, try pressing enter.
bash-4.4# 
bash-4.4# mysql -h mysql.demo.svc.cluster.local -u wordpress -p123456 wordpress
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 16
Server version: 8.0.29 MySQL Community Server - GPL

Copyright (c) 2000, 2022, Oracle and/or its affiliates.

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> exit

kubectl run dns-test --rm -it --image nicolaka/netshoot -- bash

root@master1 workload]# kubectl run dns-test --rm -it --image nicolaka/netshoot -- bash
All commands and output from this session will be recorded in container logs, including credentials and sensitive information passed through the command prompt.
If you don't see a command prompt, try pressing enter.


dns-test:~# host mysql.demo.svc.cluster.local.
mysql.demo.svc.cluster.local has address 10.111.141.148

dns-test:~# nslookup mysql.demo.svc.cluster.local
;; Got recursion not available from 10.96.0.10
;; Got recursion not available from 10.96.0.10
;; Got recursion not available from 10.96.0.10
;; Got recursion not available from 10.96.0.10
Server:         10.96.0.10
Address:        10.96.0.10#53

Name:   mysql.demo.svc.cluster.local
Address: 10.111.141.148
;; Got recursion not available from 10.96.0.10

dns-test:~#

dns-test:~# dig mysql.demo.svc.cluster.local

; <<>> DiG 9.20.17 <<>> mysql.demo.svc.cluster.local
;; global options: +cmd
;; Got answer:
;; WARNING: .local is reserved for Multicast DNS
;; You are currently testing what happens when an mDNS query is leaked to DNS
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 32657
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; COOKIE: e69ab84f8f7aebe8 (echoed)
;; QUESTION SECTION:
;mysql.demo.svc.cluster.local.  IN      A

;; ANSWER SECTION:
mysql.demo.svc.cluster.local. 30 IN     A       10.111.141.148

;; Query time: 4 msec
;; SERVER: 10.96.0.10#53(10.96.0.10) (UDP)
;; WHEN: Fri May 22 09:25:38 UTC 2026
;; MSG SIZE  rcvd: 113

root@master1 workload]# kubectl  get svc -n demo
NAME        TYPE           CLUSTER-IP       EXTERNAL-IP    PORT(S)        AGE
mysql       ClusterIP      10.111.141.148   <none>         3306/TCP       43m
wordpress   LoadBalancer   10.102.238.141   192.168.3.11   80:30644/TCP   43m

从集群外访问

http://192.168.3.11/

posted @ 2026-05-22 17:58 minger_lcm 阅读(10) 评论(0) 收藏举报

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Kubernetes 安装 MetaLB 基于 service LoadBalancer 功能 实现wordpress

进入 MySQL Pod 内部直接访问

集群内 Pod 通过 Service DNS 访问

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Kubernetes 安装 MetaLB 基于 service LoadBalancer 功能实现wordpress