这可能是一个简单的问题,但我找不到合适的解决方案。
我有一个如下所示的 Docker 镜像。我想做的事情只是在 kubernetes pod 中运行 curl 命令,但我收到如下错误。我也无法通过 bash 执行。
$ kubectl exec -ti hub-cronjob-dev-597cc575f-6lfdc -n hub-dev sh
Defaulting container name to hub-cronjob.
Use 'kubectl describe pod/hub-cronjob-dev-597cc575f-6lfdc -n hub-dev' to see all of the containers in this pod.
/usr/src/app $ curl
sh: curl: not found
尝试过 bash
$ kubectl exec -ti cronjob-dev-597cc575f-6lfdc -n hub-dev bash
mand in container: failed to exec in container: failed to start exec "8019bd0d92aef2b09923de78753eeb0c8b60a78619543e4cd27069128a30da92": OCI runtime exec failed: exec failed: container_linux.go:349: starting container process caused "exec: \"bash\": executable file not found in $PATH": unknown
docker 文件
FROM node:12-alpine AS builder
# Variables from outside
ARG NODE_ENVIRONMENT=development
ENV NODE_ENV=$NODE_ENVIRONMENT
# Create app directory
WORKDIR /usr/src/app
#Install curl
RUN apk --no-cache add curl -> did not work
RUN apk update && apk add curl curl-dev bash -> did not work
# Install app dependencies
COPY package*.json ./
RUN npm install
# Bundle app source
COPY . .
# Build Stage 2
# Take the build from the previous stage
FROM node:12-alpine
WORKDIR /usr/src/app
COPY --from=builder /usr/src/app /usr/src/app
# run the application
EXPOSE 50005 9183
CMD [ "npm", "run", "start:docker" ]
最佳答案
您的 Dockerfile 由多个阶段组成,也称为 multi-stage build .
每一个FROM
语句都是一个新的舞台和新的形象。在您的情况下,您有 2 个阶段:
builder
构建应用程序并安装 curlsecond stage
从 builder
阶段复制/usr/src/app在这种情况下,第二个 FROM node:12-alpine
语句将仅包含您从第一阶段复制的基本 alpine 包、节点工具和/usr/src/app。
如果你想在你的最终图像中使用 curl,你需要在第二阶段安装 curl
(在第二个 FROM node:12-alpine
之后):
FROM node:12-alpine AS builder
# Variables from outside
ARG NODE_ENVIRONMENT=development
ENV NODE_ENV=$NODE_ENVIRONMENT
# Create app directory
WORKDIR /usr/src/app
# Do not install
# Install app dependencies
COPY package*.json ./
RUN npm install
# Bundle app source
COPY . .
# Build Stage 2
# Take the build from the previous stage
FROM node:12-alpine
#Install curl
RUN apk update && apk add curl
WORKDIR /usr/src/app
COPY --from=builder /usr/src/app /usr/src/app
# run the application
EXPOSE 50005 9183
CMD [ "npm", "run", "start:docker" ]
正如评论中提到的,您可以通过直接运行 docker 容器来测试它——无需在 k8s 集群中运行 pod:
docker build -t image . && docker run -it image sh -c 'which curl'
对于以编译型编程语言实现的应用程序,使用多阶段构建是很常见的。
关于docker - sh : curl: not found even install curl inside k8s pod,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/65709665/