通过K8s部署wordpress:5-php7.2-fpm
目标
在默认的名称空间下创建wordpress:5-php7.2-fpm、nginx、mysql的pod。
由于nginx和wordpress（php-fpm）需要共享一个volume，所以这两个pod需要指定在同一node上部署（使用nodeSelector）。
一、给一个node打标签
目前我们测试环境有三个工作节点，分别是35、36、37：
kubectl get nodes
NAME STATUS ROLES AGE VERSION
31 Ready master 8d v1.18.2
32 Ready master 6d19h v1.18.2
33 Ready master 6d19h v1.18.2
35 Ready <none> 6d23h v1.18.2
36 Ready <none> 6d23h v1.18.2
37 Ready <none> 6d23h v1.18.2我选择为36节点打上label：
kubectl label nodes 36 nodetype=wordpress
node/36 labeled用kubectl get nodes --show-labels 可以看到36节点最后面加入了nodetype=wordpress标签。
二、设置nginx
1）nginx的default.conf配置
server {
listen 80;
server_name localhost;
access_log /var/log/nginx/host.access.log main;
location / {
root /var/www/html;
index index.php index.html index.htm;
try_files $uri $uri/ /index.php?$args;
}
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root /usr/share/nginx/html;
}
location ~ \.php$ {
fastcgi_pass wordpress.default.svc.cluster.local:9000;
fastcgi_index index.php;
fastcgi_param SCRIPT_FILENAME /var/www/html$fastcgi_script_name;
include fastcgi_params;
}
}2）设置nginx的yaml文件
apiVersion: v1
kind: ConfigMap
metadata:
name: nginx-conf
namespace: default
data:
default.conf: |
server {
listen 80;
server_name localhost;
access_log /var/log/nginx/host.access.log main;
location / {
root /var/www/html;
index index.php index.html index.htm;
try_files $uri $uri/ /index.php?$args;
}
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root /usr/share/nginx/html;
}
location ~ \.php$ {
fastcgi_pass wordpress.default.svc.cluster.local:9000;
fastcgi_index index.php;
fastcgi_param SCRIPT_FILENAME /var/www/html$fastcgi_script_name;
include fastcgi_params;
}
}
---
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
app: nginx
name: nginx
spec:
replicas: 1
selector:
matchLabels:
app: nginx
template:
metadata:
labels:
app: nginx
spec:
nodeSelector:
nodetype: wordpress #指定使用的node
containers:
- image: nginx:alpine
name: nginx
volumeMounts:
- name: ngxconfs
mountPath: /etc/nginx/conf.d/
readOnly: true
- name: wwwdata
mountPath: /var/www/html
volumes:
- name: ngxconfs
configMap:
name: nginx-conf
optional: false
- name: wwwdata
hostPath:
path: /root/wwwdata
---
apiVersion: v1
kind: Service
metadata:
labels:
app: nginx
name: nginx
namespace: default
spec:
ports:
- name: "80"
port: 80
protocol: TCP
targetPort: 80
selector:
app: nginx
type: NodePort #NodePort实现Pod外部通信
---
二、设置mysql
创建mysql.yaml，内容如下：
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
app: wpdb
name: wpdb
spec:
replicas: 1
selector:
matchLabels:
app: wpdb
template:
metadata:
labels:
app: wpdb
spec:
containers:
- image: mysql:5.7
name: wpdb
env:
- name: MYSQL_DATABASE
value: wpdb
- name: MYSQL_USER
value: wpuser
- name: MYSQL_PASSWORD
value: wppass
- name: MYSQL_RANDOM_ROOT_PASSWORD
value: '1'
---
apiVersion: v1
kind: Service
metadata:
labels:
app: wpdb
name: wpdb
namespace: default
spec:
ports:
- name: "3306"
port: 3306
protocol: TCP
targetPort: 3306
selector:
app: wpdb
type: ClusterIP三、设置wordpress（php-fpm镜像版本）
创建wordpress.yaml
apiVersion: v1
kind: ConfigMap
metadata:
name: fpm-conf
namespace: default
data:
www.conf: |
[www]
user = www-data
group = www-data
listen = 127.0.0.1:9000
pm = dynamic
pm.max_children = 5
pm.start_servers = 2
pm.min_spare_servers = 1
pm.max_spare_servers = 3
---
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
app: wordpress
name: wordpress
spec:
replicas: 1
selector:
matchLabels:
app: wordpress
template:
metadata:
labels:
app: wordpress
spec:
nodeSelector:
nodetype: wordpress
containers:
- image: wordpress:5-php7.2-fpm
name: wordpress
volumeMounts:
- name: fpmconfs
mountPath: /usr/local/etc/php-fpm.d/
readOnly: true
- name: wwwdata
mountPath: /var/www/html
env:
- name: WORDPRESS_DB_NAME
value: wpdb
- name: WORDPRESS_DB_USER
value: wpuser
- name: WORDPRESS_DB_PASSWORD
value: wppass
- name: WORDPRESS_DB_HOST
value: "wpdb.default.svc.cluster.local."
volumes:
- name: fpmconfs
configMap:
name: fpm-conf
optional: fals
- name: wwwdata
hostPath:
path: /root/wwwdata
---
apiVersion: v1
kind: Service
metadata:
labels:
app: wordpress
name: wordpress
namespace: default
spec:
ports:
- name: "9000"
port: 9000
protocol: TCP
targetPort: 9000
selector:
app: wordpress
type: ClusterIP
四、创建应用
$ kubectl apply -f mysql.yaml
deployment.apps/wpdb created
service/wpdb created
$ kubectl apply -f wordpress.yaml
configmap/fpm-conf unchanged
deployment.apps/wordpress created
service/wordpress created
$ kubectl apply -f nginx.yaml
configmap/nginx-conf created
deployment.apps/nginx created
service/nginx created查看pod的状态
$ kubectl get pod -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
nginx-7fc4b6d479-q5q6q 1/1 Running 0 2m6s 10.244.2.22 36 <none> <none>
wordpress-666b699b97-5lggt 0/1 CrashLoopBackOff 7 15m 10.244.2.20 36 <none> <none>
wpdb-698dcf9f99-pz58j 1/1 Running 0 2m53s 10.244.2.21 36 <none> <none>
P.S. 在部署wordpress的容器时我曾经遇到CrashLoopBackOff错误，用kubectl logs 容器Name -p查看日志进行排障，显示为FPM的设置问题。
[27-May-2020 16:03:34] ERROR: unable to bind listening socket for address 'wordpress.default.svc.cluster.local.:9000': Cannot assign requested address (99)
[27-May-2020 16:03:34] ERROR: FPM initialization failed当时误把socket的监听地址写成容器地址了。
查看pod的端口：
$ kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 8d
nginx NodePort 10.100.128.76 <none> 80:31456/TCP 72m
wordpress NodePort 10.100.230.206 <none> 80:31009/TCP 94s
wpdb ClusterIP 10.99.43.10 <none> 3306/TCP 73m遗留问题：wordpress.yaml配置问题，导致该pod和docker无法正常启动，留日后修改。问题文件gitee路径：https://gitee.com/maxidea/k8s-testing-files/blob/master/k8s/wordpress/wordpress.yaml
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