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Update ubuntu to 18.04
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khs1994
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@ -118,7 +118,7 @@ RUN apt-get update && apt-get install -y \
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将 `apt-get update` 放在一条单独的 `RUN` 声明中会导致缓存问题以及后续的 `apt-get install` 失败。比如，假设你有一个 `Dockerfile` 文件：
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```docker
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FROM ubuntu:14.04
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FROM ubuntu:18.04
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RUN apt-get update
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@ -128,7 +128,7 @@ RUN apt-get install -y curl
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构建镜像后，所有的层都在 Docker 的缓存中。假设你后来又修改了其中的 `apt-get install` 添加了一个包：
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```docker
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FROM ubuntu:14.04
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FROM ubuntu:18.04
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RUN apt-get update
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@ -64,18 +64,25 @@ tutum/ubuntu Ubuntu image with SSH access. For the root.
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根据搜索出来的结果，读者可以自行选择下载镜像并使用。
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下面以 ubuntu 14.04 为例，演示如何使用该镜像安装一些常用软件。
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下面以 ubuntu 18.04 为例，演示如何使用该镜像安装一些常用软件。
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首先使用 `-ti` 参数启动容器，登录 bash，查看 ubuntu 的发行版本号。
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```bash
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$ docker run -ti ubuntu:14.04 /bin/bash
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root@7d93de07bf76:/# lsb_release -a
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No LSB modules are available.
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Distributor ID: Ubuntu
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Description: Ubuntu 14.04.1 LTS
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Release: 14.04
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Codename: trusty
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$ docker run -ti ubuntu:18.04 /bin/bash
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root@7d93de07bf76:/# cat /etc/os-release
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NAME="Ubuntu"
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VERSION="18.04.1 LTS (Bionic Beaver)"
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ID=ubuntu
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ID_LIKE=debian
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PRETTY_NAME="Ubuntu 18.04.1 LTS"
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VERSION_ID="18.04"
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HOME_URL="https://www.ubuntu.com/"
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SUPPORT_URL="https://help.ubuntu.com/"
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BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
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PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
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VERSION_CODENAME=bionic
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UBUNTU_CODENAME=bionic
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```
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当试图直接使用 `apt-get` 安装一个软件的时候，会提示 `E: Unable to locate package`。
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@ -6,7 +6,7 @@
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```bash
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$ docker container ls -a
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CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
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7691a814370e ubuntu:14.04 "/bin/bash" 36 hours ago Exited (0) 21 hours ago test
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7691a814370e ubuntu:18.04 "/bin/bash" 36 hours ago Exited (0) 21 hours ago test
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$ docker export 7691a814370e > ubuntu.tar
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```
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@ -11,7 +11,7 @@
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例如，下面的命令输出一个 “Hello World”，之后终止容器。
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```bash
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$ docker run ubuntu:14.04 /bin/echo 'Hello world'
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$ docker run ubuntu:18.04 /bin/echo 'Hello world'
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Hello world
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```
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@ -20,7 +20,7 @@ Hello world
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下面的命令则启动一个 bash 终端，允许用户进行交互。
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```bash
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$ docker run -t -i ubuntu:14.04 /bin/bash
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$ docker run -t -i ubuntu:18.04 /bin/bash
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root@af8bae53bdd3:/#
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```
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@ -11,7 +11,7 @@
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```bash
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docker container ls -a
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CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
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ba267838cc1b ubuntu:14.04 "/bin/bash" 30 minutes ago Exited (0) About a minute ago trusting_newton
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ba267838cc1b ubuntu:18.04 "/bin/bash" 30 minutes ago Exited (0) About a minute ago trusting_newton
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98e5efa7d997 training/webapp:latest "python app.py" About an hour ago Exited (0) 34 minutes ago backstabbing_pike
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```
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@ -11,7 +11,6 @@ mongo 3.2 fe9198c04d62 5 days ago
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<none> <none> 00285df0df87 5 days ago 342 MB
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ubuntu 18.04 f753707788c5 4 weeks ago 127 MB
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ubuntu latest f753707788c5 4 weeks ago 127 MB
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ubuntu 14.04 1e0c3dd64ccd 4 weeks ago 188 MB
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```
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列表包含了 `仓库名`、`标签`、`镜像 ID`、`创建时间` 以及 `所占用的空间`。
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@ -79,7 +78,6 @@ $ docker image ls ubuntu
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REPOSITORY TAG IMAGE ID CREATED SIZE
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ubuntu 18.04 f753707788c5 4 weeks ago 127 MB
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ubuntu latest f753707788c5 4 weeks ago 127 MB
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ubuntu 14.04 1e0c3dd64ccd 4 weeks ago 188 MB
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```
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列出特定的某个镜像，也就是说指定仓库名和标签
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@ -151,5 +149,4 @@ fe9198c04d62 mongo 3.2
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00285df0df87 <none> <none>
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f753707788c5 ubuntu 18.04
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f753707788c5 ubuntu latest
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1e0c3dd64ccd ubuntu 14.04
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```
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@ -8,7 +8,7 @@
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压缩包可以是本地文件、远程 Web 文件，甚至是从标准输入中得到。压缩包将会在镜像 `/` 目录展开，并直接作为镜像第一层提交。
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比如我们想要创建一个 [OpenVZ](https://openvz.org/Main_Page) 的 Ubuntu 14.04 [模板](https://openvz.org/Download/template/precreated)的镜像：
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比如我们想要创建一个 [OpenVZ](https://openvz.org) 的 Ubuntu 14.04 [模板](https://openvz.org/Download/template/precreated)的镜像：
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```bash
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$ docker import \
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