容器引擎 Docker

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什么是 Docker？

Docker™ provides a way to run applications securely isolated in a container, packaged with all its dependencies and libraries.

环境搭建

下载

MacOS

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# https://docs.docker.com/desktop/mac/install/
# 根据芯片类型，下载并安装

Windows

　从 Toolbox 的 Archive 页面找到 DockerToolbox-19.03.1.exe 并下载

Toolbox 项目已经于 2021 年停止了维护

安装

　注意安装组件的时候，选择 Full installation，其他的均使用默认的选项，即可

配置

代理

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$ vim ~/.docker/config.json
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{
  "proxies": {
    "default": {
      "httpProxy": "socks5://127.0.0.1:1080",
      "httpsProxy": "socks5://127.0.0.1:1080",
      "noProxy": "*.yuzhouwan.com"
    }
  }
}

镜像源

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https://docker.mirrors.ustc.edu.cn
https://hub-mirror.c.163.com

# 另外，登陆阿里云账号后，可以通过该地址获取到专属的阿里云镜像
# https://cr.console.aliyun.com/cn-hangzhou/instances/mirrors
配置文件
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$ vim ~/.docker/config.json
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{
  "registry-mirrors": [
    "https://registry.docker-cn.com"
  ]
}
配置守护程序
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# 增加如下配置项
$ vim /etc/docker/daemon.json
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{
  "registry-mirrors": ["https://registry.docker-cn.com"]
}
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# 重启 Docker 服务使其生效
$ sudo service docker restart

# 校验是否生效
$ docker system info
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# ...
Registry Mirrors:
 https://registry.docker-cn.com
# ..
命令行指定
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$ docker-machine create --engine-registry-mirror=http://hub-mirror.c.163.com -d virtualbox kafka-connect
Desktop 设置

（对 Docker™ 的截图）

Boot 2 Docker

  • 打开 cmd 命令行
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$ cmd
  • 查看帮助文档
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$ docker-machine -h
  • 创建名为 kafka-connect 的镜像
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$ docker-machine create --driver virtualbox kafka-connect
  • 进入 kafka-connect 镜像
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$ docker-machine env kafka-connect
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SET DOCKER_TLS_VERIFY=1
SET DOCKER_HOST=tcp://127.0.0.1:2376
SET DOCKER_CERT_PATH=C:\Users\BenedictJin\.docker\machine\machines\kafka-connect
SET DOCKER_MACHINE_NAME=kafka-connect
SET COMPOSE_CONVERT_WINDOWS_PATHS=true
REM Run this command to configure your shell:
REM     @FOR /f "tokens=*" %i IN ('docker-machine env kafka-connect') DO @%i
  • 拷贝上面输出的最后一行，去掉 REM 注释，并运行
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$ @FOR /f "tokens=*" %i IN ('docker-machine env kafka-connect') DO @%i
  • 此时，就可以执行 docker 相关的命令了
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$ docker info
  • 移除 kafka-connect 镜像
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$ docker-machine rm kafka-connect

常用命令

build

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$ docker build [OPTIONS] PATH | URL | -

$ docker -D build -t apache/druid:tag -f distribution/docker/Dockerfile .

version

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$ docker version
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Client: Docker Engine - Community
 Version:           19.03.5
 API version:       1.40
 Go version:        go1.12.12
 Git commit:        633a0ea
 Built:             Wed Nov 13 07:22:34 2019
 OS/Arch:           darwin/amd64
 Experimental:      false

Server: Docker Engine - Community
 Engine:
  Version:          19.03.5
  API version:      1.40 (minimum version 1.12)
  Go version:       go1.12.12
  Git commit:       633a0ea
  Built:            Wed Nov 13 07:29:19 2019
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          v1.2.10
  GitCommit:        b34a5c8af56e510852c35414db4c1f4fa6172339
 runc:
  Version:          1.0.0-rc8+dev
  GitCommit:        3e425f80a8c931f88e6d94a8c831b9d5aa481657
 docker-init:
  Version:          0.18.0
  GitCommit:        fec3683

status

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$ service docker status
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Redirecting to /bin/systemctl status  docker.service
● docker.service - LSB: start and stop docker
   Loaded: loaded (/etc/docker/docker; enabled; vendor preset: disabled)
   Active: active (running) since Tue 2018-09-18 09:54:31 CST; 29min ago
     Docs: man:systemd-sysv-generator(8)
  Process: 14743 ExecStart=/etc/docker/docker start (code=exited, status=0/SUCCESS)
   CGroup: /docker.slice/docker.service
           ├─14907 /opt/ali-iaas/docker/plugins/alinet 127.0.0.1
           ├─14919 /opt/ali-iaas/docker/plugins/tmpfs 127.0.0.1
           └─14933 /opt/ali-iaas/docker/plugins/alilocal 127.0.0.1

logs

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$ docker logs -f <容器名 or 容器ID>

login

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$ docker login reg.docker.yuzhouwan.com

cp

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# 从容器中将文件拷贝出来
$ docker cp <容器名 or 容器ID>:/home/benedict_jin/a.txt /opt/
# 从将文件拷贝到容器里面
$ docker cp /opt/ <容器名 or 容器ID>:/home/benedict_jin/a.txt

push

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$ docker push [OPTIONS] NAME[:TAG]

$ docker push asdf2014/druid:fc95c928069537b3f3a6baf86f220b893d42fdc5
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The push refers to repository [docker.io/asdf2014/druid]
5f70bf18a086: Pushed
5228ceab8d39: Pushed
1b1abbf7c11b: Pushed
2e786558cfc7: Pushed
a4b1169e928b: Pushed
92ef334e5d67: Pushed
3375b0a62576: Pushed
1d834f05c29e: Pushed
b29380a5a354: Pushed
231bdbae9aea: Pushed
ba16d454860a: Pushed
1a5ede0c966b: Pushed
fc95c928069537b3f3a6baf86f220b893d42fdc5: digest: sha256:eefe3df1bc504516e514aac9d00abd905f4003668c11af604817dfc75caed2ee size: 2832

run

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$ docker run [OPTIONS] IMAGE[:TAG|@DIGEST] [COMMAND] [ARG...]

restart

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$ docker restart <容器名 or 容器ID>

stop

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# usage
$ docker stop [OPTIONS] CONTAINER [CONTAINER...]
# example
$ docker stop c269c13a8fee
# stop all
$ docker stop $(docker ps -a -q)

rmi

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# usage
$ docker rmi [OPTIONS] IMAGE [IMAGE...]
# example
$ docker rmi k8s.gcr.io/coredns:1.3.1

rm

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# usage
$ docker rm <容器名 or 容器ID>
# remove all
$ docker rm $(docker ps -a -f status=exited -q)
$ docker rm $(docker ps -a -f status=exited -f status=created -q)

tag

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$ docker tag SOURCE_IMAGE[:TAG] TARGET_IMAGE[:TAG]

$ docker tag c42de02bd3e2 asdf2014/druid:fc95c928069537b3f3a6baf86f220b893d42fdc5
$ docker images
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REPOSITORY                    TAG                                        IMAGE ID       CREATED        SIZE
asdf2014/druid                fc95c928069537b3f3a6baf86f220b893d42fdc5   c42de02bd3e2   23 hours ago   689MB
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$ docker images
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REPOSITORY                    TAG                                        IMAGE ID       CREATED              SIZE
apache/druid                  0.22.0_with_conf                           5931517fd053   About a minute ago   687MB
<none>                        <none>                                     4200421fc08b   16 hours ago         133MB
apache/druid                  0.22.0_conf                                1fb62951eede   2 weeks ago          686MB
<none>                        <none>                                     90c3bc4ec0af   2 weeks ago          686MB
apache/druid                  tag                                        c42de02bd3e2   2 weeks ago          689MB
asdf2014/druid                fc95c928069537b3f3a6baf86f220b893d42fdc5   c42de02bd3e2   2 weeks ago          689MB
gcr.io/k8s-minikube/kicbase   v0.0.26                                    b0c9ec980b3d   2 months ago         1.08GB
maven                         3.8.1-jdk-11-slim                          1b6721ada2a1   3 months ago         440MB
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$ docker image tag apache/druid:0.22.0_with_conf asdf2014/druid:0.22.0_with_conf
$ docker images
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REPOSITORY                    TAG                                        IMAGE ID       CREATED         SIZE
apache/druid                  0.22.0_with_conf                           5931517fd053   2 minutes ago   687MB
asdf2014/druid                0.22.0_with_conf                           5931517fd053   2 minutes ago   687MB
<none>                        <none>                                     4200421fc08b   16 hours ago    133MB
apache/druid                  0.22.0_conf                                1fb62951eede   2 weeks ago     686MB
<none>                        <none>                                     90c3bc4ec0af   2 weeks ago     686MB
apache/druid                  tag                                        c42de02bd3e2   2 weeks ago     689MB
asdf2014/druid                fc95c928069537b3f3a6baf86f220b893d42fdc5   c42de02bd3e2   2 weeks ago     689MB
gcr.io/k8s-minikube/kicbase   v0.0.26                                    b0c9ec980b3d   2 months ago    1.08GB
maven                         3.8.1-jdk-11-slim                          1b6721ada2a1   3 months ago    440MB

实用技巧

Engine API

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# 获取到 unhealthy 状态的容器
$ curl --unix-socket /var/run/docker.sock "http://localhost/containers/json?filters=\{\"health\":\[\"unhealthy\"\]\}"

# 获取到容器启动的时间戳
$ curl --unix-socket /var/run/docker.sock "http://localhost/containers/<容器 ID>/json" | jq '.State.StartedAt' | date +%s

踩到的坑

No default Boot2Docker ISO found locally

描述

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$ docker-machine create --driver virtualbox kafka-connect
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Running pre-create checks...
(dataagg) No default Boot2Docker ISO found locally, downloading the latest release...
Error with pre-create check: "Get https://api.github.com/repos/boot2docker/boot2docker/releases/latest: dial tcp 127.0.0.1:443: connectex: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond."

解决

　到 boot2docker 的 release 页面下载最新的 boot2docker.iso（当前最新版本为 v17.12.1-ce），并放到 C:\Users\BenedictJin\.docker\machine\cache 目录下，再次运行 docker-machine create xxx 命令即可

Docker.raw 单文件达到 64G

描述

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$ ll -h /Users/benedictjin/Library/Containers/com.docker.docker/Data/vms/0/data/Docker.raw
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-rw-r--r--  1 benedictjin  staff    64G  3 23 22:18 /Users/benedictjin/Library/Containers/com.docker.docker/Data/vms/0/data/Docker.raw

解决

　进入 Preferences 配置页面，选择 Disk 配置页，调整预分配磁盘大小，点击 Apply 按钮以应用修改

output clipped, log limit 1MiB reached

描述

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$ docker -D build -t apache/druid:0.22.0_with_conf -f distribution/docker/Dockerfile .

解决

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$ export BUILDKIT_STEP_LOG_MAX_SIZE=1073741824

资料

Doc

Github

Resource

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