突然有需求，需要使用go語言寫個ssh終端連接功能，這時候手上又沒有服務器，虛擬機也沒有，正好使用docker搞起來
docker容器開啟sshd服務，模擬服務器
我們知道docker是可以用exec來直接訪問容器的，但是還不夠high，有時候要模擬服務器的登錄總不能用docker exec吧，來吧，老司機帶你飛！
以centos為例，需要幾步操作
1.安裝openssh-server
2.初始化root用戶密碼
3.開啟sshd服務
廢話不多說，dockerfile獻上
FROM centos RUN yum install -y wget && \ wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo && \ yum install -y passwd && \ yum install -y openssh-server ssh-keygen && \ echo 'abcd1234' | passwd root --stdin RUN ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key -N "" -q && \ ssh-keygen -t ecdsa -f /etc/ssh/ssh_host_ecdsa_key -N "" -q && \ ssh-keygen -t ed25519 -f /etc/ssh/ssh_host_ed25519_key -N "" -q #RUN systemctl enable sshd CMD /usr/sbin/sshd && tail -f /var/log/wtmp
簡單解釋一下，
- 安裝openssh-server
yum install -y wget && \ wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo && \ yum install -y passwd && \ yum install -y openssh-server ssh-keygen
- 修改root密碼為88888888
echo '88888888' | passwd root --stdin
- 創建ssh-keygen創建相關的ssh文件，-q的意思是靜默模式（就是默認是需要讓你回車輸入的，加上這個直接跳過）
RUN ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key -N "" -q && \ ssh-keygen -t ecdsa -f /etc/ssh/ssh_host_ecdsa_key -N "" -q && \ ssh-keygen -t ed25519 -f /etc/ssh/ssh_host_ed25519_key -N "" -q
- 開啟sshd服務，並用tail來前台執行阻止docker容器退出
CMD /usr/sbin/sshd && tail -f /var/log/wtmp
一、構建鏡像
Dockerfile目錄下執行，yeah，就是chenqionghe/centos鏡像，你也可以弄成自己的，例如muscle/lightwegiht
docker build -t chenqionghe/centos .
二、運行容器
docker run --name centos_ssh -p 2222:22 -it chenqionghe/centos
三、使用ssh連接容器
這里使用了2222端口來映射容器里的22端口，運行起來就可以使用ssh連接了，輸出設置好的88888888密碼，注意，這里用的是2222映射的端口
➜ ~ ssh root@127.0.0.1 -p 2222 root@127.0.0.1's password: Last login: Tue Nov 20 04:10:17 2018 from 172.17.0.1 [root@a8c8e0fbd74f ~]# ls -l / total 56 -rw-r--r-- 1 root root 12030 Oct 6 19:15 anaconda-post.log lrwxrwxrwx 1 root root 7 Oct 6 19:14 bin -> usr/bin drwxr-xr-x 5 root root 360 Nov 20 04:09 dev drwxr-xr-x 54 root root 4096 Nov 20 04:09 etc drwxr-xr-x 2 root root 4096 Apr 11 2018 home lrwxrwxrwx 1 root root 7 Oct 6 19:14 lib -> usr/lib lrwxrwxrwx 1 root root 9 Oct 6 19:14 lib64 -> usr/lib64 drwxr-xr-x 2 root root 4096 Apr 11 2018 media drwxr-xr-x 2 root root 4096 Apr 11 2018 mnt drwxr-xr-x 2 root root 4096 Apr 11 2018 opt dr-xr-xr-x 223 root root 0 Nov 20 04:09 proc
以上就是使用docker開啟ssh模擬服務器的全過程，
附上ubuntu的Dockerfile，原理大同小異
FROM ubuntu:18.04 # Ali apt-get source.list RUN mv /etc/apt/sources.list /etc/apt/sources.list.bak && \ echo "deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse" >> /etc/apt/sources.list && \ echo "deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse" >> /etc/apt/sources.list && \ echo "deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse" >> /etc/apt/sources.list && \ echo "deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse" >> /etc/apt/sources.list && \ echo "deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse" >> /etc/apt/sources.list && \ echo "deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse" >> /etc/apt/sources.list && \ echo "deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse" >> /etc/apt/sources.list && \ echo "deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse" >> /etc/apt/sources.list && \ echo "deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse" >> /etc/apt/sources.list && \ echo "deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse" >> /etc/apt/sources.list #安裝openssh-server RUN apt-get -y update && apt-get -y upgrade && apt-get install -y openssh-server #修改默認密碼 RUN echo 'root:88888888' | chpasswd RUN mkdir -p /run/sshd # 允許登錄 RUN sed -i "s/#PermitRootLogin.*/PermitRootLogin yes/g" /etc/ssh/sshd_config RUN apt-get install -y python vim curl CMD /usr/sbin/sshd -D && tail -f /var/log/wtmp
hight起來，light weight baby!