K8s之实践Pod深入理解

1、同一pod下的nginx+php+mysql

nginx+php+mysql.yaml文件

---

apiVersion: v1

kind: Secret

metadata:

  name: mysql-pass

  namespace: default

type: Qpaque

data:

#echo -n "Passwd123" |base64

  password: UGFzc3dkMTIz

#echo -n "tmp" |base64

  database: dG1w

#echo -n "123" |base64

  passwd: MTIz

---

apiVersion: apps/v1

kind: Deployment

metadata:

  name: nginx-php-mysql

spec:

  selector:

    matchLabels:

      app: nginx-php-mysql

  replicas: 1

  template:

    metadata:

      labels:

        app: nginx-php-mysql

    spec:

      containers:

      - name: php

        image: registry.cn-shenzhen.aliyuncs.com/user-sum/php

        imagePullPolicy: IfNotPresent

        ports:

        - containerPort: 9000

        volumeMounts:

        - name: nginx-data

          mountPath: /var/www/html/

      - name: nginx

        image: registry.cn-shenzhen.aliyuncs.com/user-sum/alpine:nginx1.18.0

        imagePullPolicy: IfNotPresent

        ports:

        - containerPort: 80

        volumeMounts:

        - name: nginx-data

          mountPath: /usr/share/nginx/html

        - name: nginx-conf

          mountPath: /etc/nginx/conf.d/

      - image: mysql:5.7

        imagePullPolicy: IfNotPresent

        name: mysql

        env:

        - name: MYSQL_ROOT_PASSWORD

          valueFrom:

            secretKeyRef:

            #kubectl create secret generic mysql-pass --from-literal=password=Passwd123

              name: mysql-pass

              key: password

        - name: MYSQL_DATABASE

          valueFrom:

            secretKeyRef:

            #kubectl create secret generic mysql-pass --from-literal=database=tmp

              name: mysql-pass

              key: database

        - name: MYSQL_USER

          value: sun

        - name: MYSQL_PASSWORD

          valueFrom:

            secretKeyRef:

              #kubectl create secret generic mysql-pass --from-literal=passwd=123

              name: mysql-pass

              key: passwd

        ports:

        - containerPort: 3306

          name: mysql

        volumeMounts:

        - name: mysql-persistent-storage

          mountPath: /var/lib/mysql

      volumes:

      - name: nginx-data

        nfs:

         server: 192.168.10.10  #nfs server服务器IP

         path: "/www"

#kubectl create cm ngin-conf --from-file=/conf/default.conf

      - name: nginx-conf

        configMap:

         name: ngin-conf

         items:

         - key: default.conf

           path: add.conf

      - name: mysql-persistent-storage

        emptyDir: {}

---

apiVersion: v1

kind: Service

metadata:

  name: nginx-php-mysql

spec:

  type: NodePort

  ports:

  - name: nginx

    port: 80

    protocol: TCP

    targetPort: 80

    nodePort: 30010

  selector:

    app: nginx-php-mysql

master安装nfs（注意work节点也要安装nfs并启动）

# yum -y install nfs-utils

# systemctl start nfs

# echo "/www    192.168.10.0/24(rw,sync,no_root_squash)" >> /etc/exports

# systemctl restart nfs

# echo "test" > /www/index.html

# cat /www/index.php

<?php

  phpinfo();

?>

配置文件default.conf

# cat /conf/default.conf

server {

    listen       80;

    server_name  localhost;

    location / {

        root   /usr/share/nginx/html;

        index  index.html index.htm;

    }

    error_page   500 502 503 504  /50x.html;

    location = /50x.html {

        root   /usr/share/nginx/html;

    }

    location ~ \.php$ {

        fastcgi_pass   127.0.0.1:9000;

        fastcgi_index  index.php;

        fastcgi_param  SCRIPT_FILENAME  /var/www/html/$fastcgi_script_name;

        include        fastcgi_params;

    }

}

# kubectl create cm ngin-conf --from-file=/conf/default.conf

注意：采用configMap的挂载方式，如果修改了文件，需要删除configMap并重新创建

创建：kubectl create cm ngin-conf --from-file=/conf/default.conf

查看：kubectl describe cm

删除：kubectl delete configmaps ngin-conf

cm=configmaps(简称)

# kubectl apply -f nginx+php+mysql.yaml

测试：

[root@master-test www]# curl 192.168.10.10:30010

test

[root@master-test www]# curl 192.168.10.10:30010/index.php -I

HTTP/1.1 200 OK

Server: nginx/1.18.0

Date: Wed, 04 Nov 2020 02:50:30 GMT

Content-Type: text/html

Connection: keep-alive

X-Powered-By: PHP/5.4.16

修改vim /www/index.php

<h1>Test php-mysql </h1>

<?php

  mysqli_connect('127.0.0.1','sun','123') or die('failed');

  echo 'success';

?>

再次访问，success成功啦

[root@master-test www]# curl 192.168.10.10:30010/index.php -i

HTTP/1.1 200 OK

Server: nginx/1.18.0

Date: Wed, 04 Nov 2020 02:54:15 GMT

Content-Type: text/html

Transfer-Encoding: chunked

Connection: keep-alive

X-Powered-By: PHP/5.4.16

<h1>Test php-mysql </h1>

success[root@master-test www]#

2、nginx+php同一个Pod、mysql另一个Pod

nginx+php.yaml文件

---

apiVersion: apps/v1

kind: Deployment

metadata:

  name: nginx-php

spec:

  selector:

    matchLabels:

      app: nginx-php

  replicas: 1

  template:

    metadata:

      labels:

        app: nginx-php

    spec:

      containers:

      - name: php

        image: registry.cn-shenzhen.aliyuncs.com/user-sum/php

        imagePullPolicy: IfNotPresent

        ports:

        - containerPort: 9000

        volumeMounts:

        - name: nginx-data

          mountPath: /var/www/html/

      - name: nginx

        image: registry.cn-shenzhen.aliyuncs.com/user-sum/alpine:nginx1.18.0

        imagePullPolicy: IfNotPresent

        ports:

        - containerPort: 80

        volumeMounts:

        - name: nginx-data

          mountPath: /usr/share/nginx/html

        - name: nginx-conf

          mountPath: /etc/nginx/conf.d/

      volumes:

      - name: nginx-data

        nfs:

         server: 192.168.10.10  #nfs server服务器IP

         path: "/www"

      - name: nginx-conf

        configMap:

         name: ngin-conf

         items:

         - key: default.conf

           path: add.conf

---

apiVersion: v1

kind: Service

metadata:

  name: nginx-php

spec:

  type: NodePort

  ports:

  - name: nginx

    port: 80

    protocol: TCP

    targetPort: 80

    nodePort: 30010

  selector:

    app: nginx-php

配置文件default.conf(和1一样，不用修改)

# cat /conf/default.conf

server {

    listen       80;

    server_name  localhost;

    location / {

        root   /usr/share/nginx/html;

        index  index.html index.htm;

    }

    error_page   500 502 503 504  /50x.html;

    location = /50x.html {

        root   /usr/share/nginx/html;

    }

    location ~ \.php$ {

        fastcgi_pass   127.0.0.1:9000;

        fastcgi_index  index.php;

        fastcgi_param  SCRIPT_FILENAME  /var/www/html/$fastcgi_script_name;

        include        fastcgi_params;

    }

}

master安装nfs（注意work节点也要安装nfs并启动）

# yum -y install nfs-utils

# systemctl start nfs

# echo "/www    192.168.10.0/24(rw,sync,no_root_squash)" >> /etc/exports

# systemctl restart nfs

# echo "test" > /www/index.html

# cat /www/index.php

<?php

  phpinfo();

?>

# kubectl apply -f nginx+php.yaml

mysql.yaml

---

apiVersion: v1

kind: Secret

metadata:

  name: mysql-pass

  namespace: default

type: Qpaque

data:

#echo -n "Passwd123" |base64

  password: UGFzc3dkMTIz

#echo -n "tmp" |base64

  database: dG1w

#echo -n "123" |base64

  passwd: MTIz

---

apiVersion: apps/v1

kind: Deployment

metadata:

  name: mysql

spec:

  selector:

    matchLabels:

      app: mysql

  replicas: 1

  template:

    metadata:

      labels:

        app: mysql

    spec:

      containers:

      - image: mysql:5.7

        imagePullPolicy: IfNotPresent

        name: mysql

        env:

        - name: MYSQL_ROOT_PASSWORD

          valueFrom:

            secretKeyRef:

            #kubectl create secret generic mysql-pass --from-literal=password=Passwd123

              name: mysql-pass

              key: password

        - name: MYSQL_DATABASE

          valueFrom:

            secretKeyRef:

            #kubectl create secret generic mysql-pass --from-literal=database=tmp

              name: mysql-pass

              key: database

        - name: MYSQL_USER

          value: sun

        - name: MYSQL_PASSWORD

          valueFrom:

            secretKeyRef:

              #kubectl create secret generic mysql-pass --from-literal=passwd=123

              name: mysql-pass

              key: passwd

        ports:

        - containerPort: 3306

          name: mysql

        volumeMounts:

        - name: mysql-persistent-storage

          mountPath: /var/lib/mysql

      volumes:

      - name: mysql-persistent-storage

        emptyDir: {}

---

apiVersion: v1

kind: Service

metadata:

  name: mysql

  labels:

    app: mysql

spec:

  ports:

  - name: mysql

    port: 3306

    targetPort: 3306

  selector:

    app: mysql

# kubectl apply -f mysql.yaml

测试：

修改vim /www/index.php

<h1>Test php-mysql </h1>

<?php

  mysqli_connect('10.106.159.184','sun','123') or die('failed');

  echo 'success';

?>

再次访问，success成功啦

[root@master-test ~]# curl 192.168.10.10:30010/index.php -i

HTTP/1.1 200 OK

Server: nginx/1.18.0

Date: Wed, 04 Nov 2020 03:40:58 GMT

Content-Type: text/html

Transfer-Encoding: chunked

Connection: keep-alive

X-Powered-By: PHP/5.4.16

<h1>Test php-mysql </h1>

success[root@master-test ~]#

3、php一个Pod、nginx一个Pod、mysql一个Pod

php.yaml

---

apiVersion: apps/v1

kind: Deployment

metadata:

  name: php

spec:

  selector:

    matchLabels:

      app: php

  replicas: 1

  template:

    metadata:

      labels:

        app: php

    spec:

      containers:

      - name: php

        image: registry.cn-shenzhen.aliyuncs.com/user-sum/php

        imagePullPolicy: IfNotPresent

        ports:

        - containerPort: 9000

        volumeMounts:

        - name: nginx-data

          mountPath: /var/www/html/

      volumes:

      - name: nginx-data

        nfs:

         server: 192.168.10.10  #nfs server服务器IP

         path: "/www"

---

apiVersion: v1

kind: Service

metadata:

  name: php

spec:

  ports:

  - name: php

    port: 9000

    protocol: TCP

    targetPort: 9000

  selector:

    app: php

# kubectl aapply -f php.yml

nginx.yaml

---

apiVersion: apps/v1

kind: Deployment

metadata:

  name: nginx

spec:

  selector:

    matchLabels:

      app: nginx

  replicas: 1

  template:

    metadata:

      labels:

        app: nginx

    spec:

      containers:

      - name: nginx

        image: registry.cn-shenzhen.aliyuncs.com/user-sum/alpine:nginx1.18.0

        imagePullPolicy: IfNotPresent

        ports:

        - containerPort: 80

        volumeMounts:

        - name: nginx-data

          mountPath: /usr/share/nginx/html

        - name: nginx-conf

          mountPath: /etc/nginx/conf.d/

      volumes:

      - name: nginx-data

        nfs:

         server: 192.168.10.10  #nfs server服务器IP

         path: "/www"

      - name: nginx-conf

        configMap:

         name: ngin-conf

         items:

         - key: default.conf

           path: add.conf

---

apiVersion: v1

kind: Service

metadata:

  name: nginx

spec:

  type: NodePort

  ports:

  - name: nginx

    port: 80

    protocol: TCP

    targetPort: 80

    nodePort: 30010

  selector:

    app: nginx

配置文件nginx.conf

# cat /conf/default.conf

server {

    listen       80;

    server_name  localhost;

    location / {

        root   /usr/share/nginx/html;

        index  index.php index.html index.htm;

    }

    error_page   500 502 503 504  /50x.html;

    location = /50x.html {

        root   /usr/share/nginx/html;

    }

    location ~ \.php$ {

        fastcgi_pass   10.108.129.142:9000;

        fastcgi_index  index.php;

        fastcgi_param  SCRIPT_FILENAME  /var/www/html/$fastcgi_script_name;

        include        fastcgi_params;

    }

}

删除：kubectl delete configmaps ngin-conf

重新创建：kubectl create cm ngin-conf --from-file=/conf/default.conf

# kubectl apply -f nginx.yaml

mysql.yaml

 ---

apiVersion: v1

kind: Secret

metadata:

  name: mysql-pass

  namespace: default

type: Qpaque

data:

#echo -n "Passwd123" |base64

  password: UGFzc3dkMTIz

#echo -n "tmp" |base64

  database: dG1w

#echo -n "123" |base64

  passwd: MTIz

---

apiVersion: apps/v1

kind: Deployment

metadata:

  name: mysql

spec:

  selector:

    matchLabels:

      app: mysql

  replicas: 1

  template:

    metadata:

      labels:

        app: mysql

    spec:

      containers:

      - image: mysql:5.7

        imagePullPolicy: IfNotPresent

        name: mysql

        env:

        - name: MYSQL_ROOT_PASSWORD

          valueFrom:

            secretKeyRef:

            #kubectl create secret generic mysql-pass --from-literal=password=Passwd123

              name: mysql-pass

              key: password

        - name: MYSQL_DATABASE

          valueFrom:

            secretKeyRef:

            #kubectl create secret generic mysql-pass --from-literal=database=tmp

              name: mysql-pass

              key: database

        - name: MYSQL_USER

          value: sun

        - name: MYSQL_PASSWORD

          valueFrom:

            secretKeyRef:

              #kubectl create secret generic mysql-pass --from-literal=passwd=123

              name: mysql-pass

              key: passwd

        ports:

        - containerPort: 3306

          name: mysql

        volumeMounts:

        - name: mysql-persistent-storage

          mountPath: /var/lib/mysql

      volumes:

      - name: mysql-persistent-storage

        emptyDir: {}

---

apiVersion: v1

kind: Service

metadata:

  name: mysql

  labels:

    app: mysql

spec:

  ports:

  - name: mysql

    port: 3306

    targetPort: 3306

  selector:

    app: mysql

# kubectl apply -f mysql.yaml

测试：

修改vim /www/index.php

<h1>Test php-mysql </h1>

<?php

  mysqli_connect('10.109.228.202','sun','123') or die('failed');

  echo 'success';

#  phpinfo();

?>

再次访问，success成功啦

[root@master-test ~]# curl 192.168.10.10:30010/index.php -i

HTTP/1.1 200 OK

Server: nginx/1.18.0

Date: Wed, 04 Nov 2020 05:24:57 GMT

Content-Type: text/html

Transfer-Encoding: chunked

Connection: keep-alive

X-Powered-By: PHP/5.4.16

<h1>Test php-mysql </h1>

success[root@master-test ~]#