Kubernetes - Dockerfile
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Kubernetes - Dockerfile
Image 镜像由多层 Layer 组成，Layer 是一组只读不可修改的文件，Layer 可以在镜像间共享Image = Layer + Union FS 1234567891011121314$ docker inspect nginx:alpine... "RootFS": { "Type": "layers", "Layers": [ "sha256:e5e13b0c77cbb769548077189c3da2f0a764ceca06af49d8d558e759f5c232bd", "sha256:07099189e7ec257e501d9625507b55e0ea32c330e38c90d8533b3fa2a7a97069", "sha256:fcf860bf48b4e20f24f44ba02...
2022-09-15
Kubernetes - Docker Architecture
Architecture 核心是 Docker daemon Flow123456789101112131415161718192021222324252627$ docker run hello-worldUnable to find image 'hello-world:latest' locallylatest: Pulling from library/hello-world2db29710123e: Pull completeDigest: sha256:faa03e786c97f07ef34423fccceeec2398ec8a5759259f94d99078f264e9d7afStatus: Downloaded newer image for hello-world:latestHello from Docker!This message shows that your installation appears to be working correctly.To generate this message, Docker took the following...
2022-09-26
Kubernetes - Docker Hub
Registry Registry -> Repository Docker Hub 默认 Registry ImageOfficial Dockerhttps://hub.docker.com/u/library Verified Bitnami / Rancher / Ubuntu Unofficial半官方 开通 Verified publisher，需要付费 民间 个人镜像 Naming user/app:tagtag = version + osslim / fat OS Example Alpine / CentOS alpine3.15 Ubuntu 18.04 bionic Ubuntu 20.04 focal Debian 9 stretch Debian 10 buster Debian 11 bullseye FlowOnline1234567$ docker login -u zhongmingmaoPassword:WARNING! Your pas...
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Kubernetes - Docker Nature
本质 容器，是一个特殊的隔离环境，能够让进程只看到这个环境内的有限信息，不能对外界环境施加影响隔离的原因：系统安全隔离的实现：namespace + cgroup + chroot(rootfs) Container vs VM 容器并不是直接运行在 Docker 上，Docker 只是辅助建立隔离环境，让容器基于 Linux 运行 VM 虚拟化出来的是硬件，需要在上面再安装一个 Guest OS 才能运行应用程序，会消耗大量的系统资源 容器则直接利用了下层的计算机硬件和操作系统，非常轻量级，但多个容器共用 OS Kernel，隔离程度不如 VM 实现方式 优势 劣势 VM 虚拟化硬件 隔离程度非常高 资源消耗大，启动慢 Container 直接利用下层的硬件和操作系统 资源利用率高运行速度快 隔离程度较低
