1.题目概述

  • 添加一个sidecar容器（使用busybox镜像）到已有的pod 11-factor-app中
  • 确保sidecar容器能够输出/var/log/11-factor-app.log的信息

  • 使用volume挂载/var/log目录，确保sidecar能访问11-factor-app.log文件

    2.解析

  • 通过kubectl get pod -o yaml的方法将pod备份，删除旧pod 11-factor-app

  • copy一份新的yaml文件，添加一个名为sidecar的容器
  • 新建emptyDir的卷，确保两个容器都挂载了/var/log目录
  • 新建含有sidecar的pod，并通过kubectl logs验证

    3.参考答案

    3.1.备份pod

    1. kubectl get po 11-factor-app -o yaml > pod.yaml

    3.2.修改yaml

    1. apiVersion: v1
    2. kind: Pod
    3. metadata:
    4. name: 11-factor-app
    5. spec:
    6. containers:
    7. - name: 11-factor-app
    8.   image: busybox
    9.   args:
    10.   - /bin/sh
    11.   - -c
    12.   - >
    13.     i=0;
    14.     while true;
    15.     do
    16.       echo "$i: $(date)" >> /var/log/11-factor-app.log;
    17.       i=$((i+1));
    18.       sleep 1;
    19.     done      
    20.   volumeMounts:
    21.   - name: varlog
    22.     mountPath: /var/log
    23. - name: sidecar
    24.   image: busybox
    25.   args: [/bin/sh, -c, 'tail -n+1 -f /var/log/11-factor-app.log']
    26.   volumeMounts:
    27.   - name: varlog
    28.     mountPath: /var/log
    29. volumes:
    30. - name: varlog
    31.   emptyDir: {}

    3.3.创建pod

    1. kubectl apply -f pod.yaml
    https://kubernetes.io/docs/concepts/cluster-administration/logging/