kubernetes - minikube : how to add second container to the pod?

Question

我正在寻求有关如何将第二个容器添加到现有 pod(我的意思是一个带有两个容器的 pod)的帮助。错误是 CrashLoopBackOff .我正在使用 minikube。我请求任何帮助解决问题将不胜感激。

wordpress.yaml
--------XXXX------------------
apiVersion: v1
kind: Service
metadata:
  name: my-nginx-svc
  labels:
    app: nginx
spec:
  type: LoadBalancer
  ports:
  - port: 80
  selector:
    app: nginx
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: my-nginx
  labels:
    app: nginx
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.14.2
        ports:
        - containerPort: 80
     - name: wordpress
        image: wordpress
        ports:
        - containerPort: 80

#watch kubectl get pods

Every 2.0s: kubectl get pods                                                                                                                         cent8-minikube: Wed Jun 10 16:47:30 2020

NAME                            READY   STATUS             RESTARTS   AGE
my-nginx-6b474476c4-9p4cn       1/1     Running            0          5h41m
my-nginx-6b474476c4-m2xkd       1/1     Running            0          5h41m
my-nginx-9f44b5996-744n5        1/2     CrashLoopBackOff   9          21m
my-nginx-9f44b5996-vl6g2        1/2     CrashLoopBackOff   9          22m
test-minikube-f4df69575-2sbl5   1/1     Running            0          26h

[root@cent8-minikube ~]# kubectl describe pod my-nginx-9f44b5996-vl6g2
Name:         my-nginx-9f44b5996-vl6g2
Namespace:    default
Priority:     0
Node:         cent8-minikube/192.168.194.128
Start Time:   Wed, 10 Jun 2020 16:25:14 -0700
Labels:       app=nginx
              pod-template-hash=9f44b5996
Annotations:  <none>
Status:       Running
IP:           172.17.0.8
IPs:
  IP:           172.17.0.8
Controlled By:  ReplicaSet/my-nginx-9f44b5996
Containers:
  nginx:
    Container ID:   docker://5e4cfd4e726373916a105a95644a7a286966482e33eaaac986e44514aef86606
    Image:          nginx:1.14.2
    Image ID:       docker-pullable://nginx@sha256:f7988fb6c02e0ce69257d9bd9cf37ae20a60f1df7563c3a2a6abe24160306b8d
    Port:           80/TCP
    Host Port:      0/TCP
    State:          Running
      Started:      Wed, 10 Jun 2020 16:25:16 -0700
    Ready:          True
    Restart Count:  0
    Environment:    <none>
    Mounts:
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-lqnj8 (ro)
  wordpress:
    Container ID:   docker://5e37277badca1658a10d4d826428f538a45d5e0eaecabd5e196f8b6ab5848ec7
    Image:          wordpress
    Image ID:       docker-pullable://wordpress@sha256:ff8be61894e74b6a005ab54ba73aa7084b6dbd11605f12ac383549763918bf09
    Port:           80/TCP
    Host Port:      0/TCP
    State:          Waiting
      Reason:       CrashLoopBackOff
    Last State:     Terminated
      Reason:       Error
      Exit Code:    1
      Started:      Wed, 10 Jun 2020 16:46:37 -0700
      Finished:     Wed, 10 Jun 2020 16:46:38 -0700
    Ready:          False
    Restart Count:  9
    Environment:    <none>
    Mounts:
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-lqnj8 (ro)
Conditions:
  Type              Status
  Initialized       True
  Ready             False
  ContainersReady   False
  PodScheduled      True
Volumes:
  default-token-lqnj8:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  default-token-lqnj8
    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  23m                   default-scheduler        Successfully assigned default/my-nginx-9f44b5996-vl6g2 to cent8-minikube
  Normal   Pulled     23m                   kubelet, cent8-minikube  Container image "nginx:1.14.2" already present on machine
  Normal   Created    23m                   kubelet, cent8-minikube  Created container nginx
  Normal   Started    23m                   kubelet, cent8-minikube  Started container nginx
  Normal   Pulling    22m (x4 over 23m)     kubelet, cent8-minikube  Pulling image "wordpress"
  Normal   Pulled     22m (x4 over 23m)     kubelet, cent8-minikube  Successfully pulled image "wordpress"
  Normal   Created    22m (x4 over 23m)     kubelet, cent8-minikube  Created container wordpress
  Normal   Started    22m (x4 over 23m)     kubelet, cent8-minikube  Started container wordpress
  Warning  BackOff    3m35s (x95 over 23m)  kubelet, cent8-minikube  Back-off restarting failed container
[root@cent8-minikube ~]#

[root@cent8-minikube ~]# kubectl describe pod my-nginx-9f44b5996-744n5
Name:         my-nginx-9f44b5996-744n5
Namespace:    default
Priority:     0
Node:         cent8-minikube/192.168.194.128
Start Time:   Wed, 10 Jun 2020 16:25:33 -0700
Labels:       app=nginx
              pod-template-hash=9f44b5996
Annotations:  <none>
Status:       Running
IP:           172.17.0.10
IPs:
  IP:           172.17.0.10
Controlled By:  ReplicaSet/my-nginx-9f44b5996
Containers:
  nginx:
    Container ID:   docker://9e3d6f0073e51eb475c2f2677fa413509f49a07c955d04b09417811d37ba8433
    Image:          nginx:1.14.2
    Image ID:       docker-pullable://nginx@sha256:f7988fb6c02e0ce69257d9bd9cf37ae20a60f1df7563c3a2a6abe24160306b8d
    Port:           80/TCP
    Host Port:      0/TCP
    State:          Running
      Started:      Wed, 10 Jun 2020 16:25:35 -0700
    Ready:          True
    Restart Count:  0
    Environment:    <none>
    Mounts:
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-lqnj8 (ro)
  wordpress:
    Container ID:   docker://2ca8f22ab14b88973dca8d4d486f82a5b0d9bc7b84960882cff0a81afd744bf4
    Image:          wordpress
    Image ID:       docker-pullable://wordpress@sha256:ff8be61894e74b6a005ab54ba73aa7084b6dbd11605f12ac383549763918bf09
    Port:           80/TCP
    Host Port:      0/TCP
    State:          Waiting
      Reason:       CrashLoopBackOff
    Last State:     Terminated
      Reason:       Error
      Exit Code:    1
      Started:      Wed, 10 Jun 2020 16:46:41 -0700
      Finished:     Wed, 10 Jun 2020 16:46:42 -0700
    Ready:          False
    Restart Count:  9
    Environment:    <none>
    Mounts:
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-lqnj8 (ro)
Conditions:
  Type              Status
  Initialized       True
  Ready             False
  ContainersReady   False
  PodScheduled      True
Volumes:
  default-token-lqnj8:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  default-token-lqnj8
    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  26m                  default-scheduler        Successfully assigned default/my-nginx-9f44b5996-744n5 to cent8-minikube
  Normal   Pulled     26m                  kubelet, cent8-minikube  Container image "nginx:1.14.2" already present on machine
  Normal   Created    26m                  kubelet, cent8-minikube  Created container nginx
  Normal   Started    26m                  kubelet, cent8-minikube  Started container nginx
  Normal   Pulling    25m (x4 over 26m)    kubelet, cent8-minikube  Pulling image "wordpress"
  Normal   Pulled     25m (x4 over 26m)    kubelet, cent8-minikube  Successfully pulled image "wordpress"
  Normal   Created    25m (x4 over 26m)    kubelet, cent8-minikube  Created container wordpress
  Normal   Started    25m (x4 over 26m)    kubelet, cent8-minikube  Started container wordpress
  Warning  BackOff    67s (x116 over 26m)  kubelet, cent8-minikube  Back-off restarting failed container
[root@cent8-minikube ~]#

``` [root@cent8-minikube ~]# kubectl logs my-nginx-9f44b5996-vl6g2 -c wordpress WordPress not found in /var/www/html - copying now... Complete! WordPress has been successfully copied to /var/www/html AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 172.17.0.8. Set the 'ServerName' directive globally to suppress this message (98)Address already in use: AH00072: make_sock: could not bind to address 0.0.0.0:80 no listening sockets available, shutting down AH00015: Unable to open logs 

如何向 Pod 添加第二个容器？

在哪里检查崩溃容器的日志或如何调试？

你能指导我，如何解决这个错误？

Answer 1

虽然我同意在单独的 Pod 中运行单独的应用程序，但有时将它们放在一起更容易。在目前的情况下，这可以通过以下方式实现:

Wordpress 是硬配置，因此将 Nginx 移动到单独的端口更可行(如果不是完全直接的话)

    apiVersion: v1
kind: ConfigMap
metadata:
  name: nginx
data:
  default.conf.template: |
    server {
        listen       ${NGINX_PORT};
        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;
        }
    }
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: my-nginx
  labels:
    app: nginx
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
        - name: nginx
          image: nginx
          env:
            - name: NGINX_PORT
              value: "81"
          volumeMounts:
            - mountPath: /etc/nginx/templates/
              name: config
          ports:
            - containerPort: 81
        - name: wordpress
          image: wordpress
          ports:
            - containerPort: 80
      volumes:
        - name: config
          configMap:
            name: nginx