DAY 2

今天要来安装kubernetes，不过在安装k8s前我们需要先装docker，有关docker的介绍可以参考之前的文章:Day2 浅谈Docker-虚拟机器和容器的差别，以下我们直接进入docker的安装步骤。

Docker 安装步骤

1.更新apt并安装软件包用来通过HTTPS获取存储库

apt-get update
apt-get install -y apt-transport-https \
   ca-certificates \
   curl \
   gnupg-agent \
   software-properties-common

2.加入Docker的官方GPG密钥

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | apt-key add -

3.设定稳定版本的存储库

add-apt-repository \
"deb [arch=amd64] https://download.docker.com/linux/ubuntu \
$(lsb_release -cs) \
stable"

4.更新apt，安装最新版本的Docker Engine-Community和Containerd

apt-get update
apt-get install -y docker-ce docker-ce-cli containerd.io

5.测试Docker是否安装成功，输入以下指令，出现以下讯息则安装成功

$ sudo docker run hello-world

Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
b8dfde127a29: Pull complete
Digest: sha256:61bd3cb6014296e214ff4c6407a5a7e7092dfa8eefdbbec539e133e97f63e09f
Status: Downloaded newer image for hello-world:latest

Hello from Docker!
This message shows that your installation appears to be working correctly.

To generate this message, Docker took the following steps:
 1. The Docker client contacted the Docker daemon.
 2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
    (amd64)
 3. The Docker daemon created a new container from that image which runs the
    executable that produces the output you are currently reading.
 4. The Docker daemon streamed that output to the Docker client, which sent it
    to your terminal.

To try something more ambitious, you can run an Ubuntu container with:
 $ docker run -it ubuntu bash

Share images, automate workflows, and more with a free Docker ID:
 https://hub.docker.com/

For more examples and ideas, visit:
 https://docs.docker.com/get-started/

明天再来装kubernetes，又过一天：）