基于Docker搭建大数据集群（一）Docker环境部署
本篇文章是基于Docker搭建大数据集群系列的开篇之作
主要内容
- docker搭建
- docker部署CentOS
- 容器免密钥通信
- 容器保存成镜像
- docker镜像发布
环境
- Linux 7.6
一、Docker安装
安装工具包
yum install -y yum-utils #安装工具包，缺少这些依赖将无法完成```
### 设置远程仓库
```bash
yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo```
### 安装
```bash
yum install docker-ce```
### 启动
```bash
systemctl start docker```
### 查看版本
```bash
docker version```
### 校验
```bash
docker run hello-world```
## 二、docker部署CentOS
### 拉取镜像
```bash
docker pull centos```
### 查看是否拉取成功
```bash
docker imsages```
### 设置docker网桥，用于分配固定IP
```bash
docker network create --subnet=172.15.0.0/16 netgroup```
### 创建容器
> --name 容器名称
> -h 容器主机名
> --net 设置网桥
> --ip 指定容器IP
**master**
docker run -d –privileged -ti -v /sys/fs/cgroup:/sys/fs/cgroup –name cluster-master -h cluster-master –net netgroup –ip 172.15.0.2 centos /usr/sbin/init
**slave1**
docker run -d –privileged -ti -v /sys/fs/cgroup:/sys/fs/cgroup –name cluster-slave1-h cluster-slave1–net netgroup –ip 172.15.0.3 centos /usr/sbin/init
**slave2**
docker run -d –privileged -ti -v /sys/fs/cgroup:/sys/fs/cgroup –name cluster-slave2-h cluster-slave2–net netgroup –ip 172.15.0.4 centos /usr/sbin/init
**slave3**
docker run -d –privileged -ti -v /sys/fs/cgroup:/sys/fs/cgroup –name cluster-slave3-h cluster-slave3–net netgroup –ip 172.15.0.5 centos /usr/sbin/init
### 查看运行中的容器
```bash
docker ps```
### 查看所有容器，包括未运行的容器
```bash
docker pa -a```
### 运行容器
```bash
docker run 容器名或容器ID```
### 进入容器
```bash
docker run exec -ti 容器名或容器ID bash```
### 配置hosts文件
```bash
#安装VIM编辑工具
yum install vim
vim /etc/hosts
#追加以下内容
172.15.0.2 cluster-master
172.15.0.3 cluster-slave1
172.15.0.4 cluster-slave2
172.15.0.5 cluster-slave3
#将配置文件发送到其它节点
scp /etc/hosts cluster-slave1:/etc/
scp /etc/hosts cluster-slave2:/etc/
scp /etc/hosts cluster-slave3:/etc/
三、容器免密钥通信
更换阿里YUM源
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
部署OpenSSH
yum -y install openssh openssh-server openssh-clients
systemctl start sshd
生成密钥
敲出下面命令后连续回车三次
ssh-keygen -t rsa```
### 设置用户密码
```bash
passwd root```
### 公钥分发
> 在所有结点都生成密钥之后再进行这步
**master**
``` bash
ssh-copy-id -f -i ~/.ssh/id_rsa.pub cluster-master
ssh-copy-id -f -i ~/.ssh/id_rsa.pub cluster-slave1
ssh-copy-id -f -i ~/.ssh/id_rsa.pub cluster-slave2
ssh-copy-id -f -i ~/.ssh/id_rsa.pub cluster-slave3
slave1
ssh-copy-id -f -i ~/.ssh/id_rsa.pub cluster-master
ssh-copy-id -f -i ~/.ssh/id_rsa.pub cluster-slave1
ssh-copy-id -f -i ~/.ssh/id_rsa.pub cluster-slave2
ssh-copy-id -f -i ~/.ssh/id_rsa.pub cluster-slave3
slave2
ssh-copy-id -f -i ~/.ssh/id_rsa.pub cluster-master
ssh-copy-id -f -i ~/.ssh/id_rsa.pub cluster-slave1
ssh-copy-id -f -i ~/.ssh/id_rsa.pub cluster-slave2
ssh-copy-id -f -i ~/.ssh/id_rsa.pub cluster-slave3
slave3
ssh-copy-id -f -i ~/.ssh/id_rsa.pub cluster-master
ssh-copy-id -f -i ~/.ssh/id_rsa.pub cluster-slave1
ssh-copy-id -f -i ~/.ssh/id_rsa.pub cluster-slave2
ssh-copy-id -f -i ~/.ssh/id_rsa.pub cluster-slave3
测试免密钥
第一次敲下面命令时，会向你询问，直接打
yes，然后输入对应主机的访问密码
第二次敲ssh命令时，应当直接能够访问，无需输入密码
退出当前用户使用命令exit
master
ssh cluster-master
ssh cluster-slave1
ssh cluster-slave1
ssh cluster-slave1
slave1
ssh cluster-master
ssh cluster-slave1
ssh cluster-slave1
ssh cluster-slave1
slave2
ssh cluster-master
ssh cluster-slave1
ssh cluster-slave1
ssh cluster-slave1
slave3
ssh cluster-master
ssh cluster-slave1
ssh cluster-slave1
ssh cluster-slave1
四、容器保存成镜像
docker commit -m \'提交文字说明\' -a \'作者\' 容器名 提交后的镜像名:提交后的镜像tag名
五、镜像推送到远程仓库
新建账号
创建一个镜像仓库
给需要推送的镜像打标签
docker tag 镜像id 要推入的仓库的用户名/要推入的仓库名:新定义的tag
推送镜像到仓库
docker push 要推入的仓库的用户名/要推入的仓库名:镜像标签