Install Centos7 operating system in Docker#

If you have not installed Docker, please move to:

My server version#

[ root@shendu ~]# docker version
Client:
 Version:1.13.1
 API version:1.26
 Package version: docker-1.13.1-102.git7f2769b.el7.centos.x86_64
 Go version:      go1.10.3
 Git commit:      7f2769b/1.13.1
 Built:           Mon Aug  515:09:422019
 OS/Arch:         linux/amd64

Server:
 Version:1.13.1
 API version:1.26(minimum version 1.12)
 Package version: docker-1.13.1-102.git7f2769b.el7.centos.x86_64
 Go version:      go1.10.3
 Git commit:      7f2769b/1.13.1
 Built:           Mon Aug  515:09:422019
 OS/Arch:         linux/amd64
 Experimental:false[root@shendu ~]# 

[ root@shendu ~]# uname -a
Linux shendu 3.10.0-693.2.2.el7.x86_64 #1 SMP Tue Sep 1222:26:13 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
[ root@shendu ~]# 

[ root@shendu ~]# cat /etc/redhat-release 
CentOS Linux release 7.6.1810(Core)[root@shendu ~]#

Description:

In view of the domestic network problems, it is very slow to pull the Docker image, and it needs to be set to a domestic image before installation, which can be accelerated.

One, set up mirror accelerator#

I am using NetEase’s mirror address: http://hub-mirror.c.163.com

NetEase Cloud Mirror official address https://c.163yun.com/hub#/library/repository/info?repoId=1055

Configure under centos7:

[ root@shendu ~]# 
[ root@shendu ~]# cat /etc/docker/daemon.json 
{" registry-mirrors":["http://hub-mirror.c.163.com"]}[root@shendu ~]#

Then execute the following two commands to take effect:

sudo systemctl daemon-reload 
 
sudo systemctl restart docker

Create a Dockerfile file: (I created it directly in the root user directory)
document content:

FROM hub.c.163.com/netease_comb/centos:7
MAINTAINER netease
 
# Update yum source
RUN yum makecache fast && yum -y update glibc    
 
# Install common software
RUN yum install -y openssh-server vim tar wget curl rsync bzip2 iptables tcpdump less telnet net-tools lsof
# Initialize ssh login
RUN ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key -N ''
RUN ssh-keygen -t dsa -f /etc/ssh/ssh_host_dsa_key -N ''
RUN ssh-keygen -t ecdsa -f /etc/ssh/ssh_host_ecdsa_key -N ''
RUN ssh-keygen -t ed25519 -f /etc/ssh/ssh_host_ed25519_key -N ''
RUN echo "RSAAuthentication yes">>/etc/ssh/sshd_config
RUN echo "PubkeyAuthentication yes">>/etc/ssh/sshd_config    
 
RUN yum clean all
 
# Start the sshd service and expose port 22
RUN mkdir /var/run/sshd    
 
EXPOSE 22    
 
CMD ["/usr/sbin/sshd","-D"]

Two, get Centos7 mirror#

Run under the folder of Dockerfile: docker build -t centos7-my .
centos7-my is the name of the generated image
If successful, execute docker images and you will see the following result

Three, start the container#

Command: docker run -itd --name os1 -p 10000:22 87bd98509c5e /bin/bash
- - name os1: the name of the container that started the container
87 bd98509c5e: mirror id
- p 10000:22: Port mapping, map container 22 port to Host10000 port for subsequent SSH remote login

Fourth, open the ssh link#

1、 Enter the os1 container:

Command: docker exec -it os1 bash

[ root@shendu ~]# 
[ root@shendu ~]# docker exec -it os1 bash
[ root@d6898c947c4b /]# 
[ root@d6898c947c4b /]#

2、 Start ssh:

Execute first

[ root@d6898c947c4b /]# /usr/sbin/sshd -D

The following results will appear:

Then execute (Enter twice, if there is a warning, you can ignore it)

[ root@d6898c947c4b /]# /usr/sbin/sshd -D &

The following results will appear:

3、 Check if it has started successfully

Use the command: netstat -ntpl |grep 22 or lsof -i:22

[ root@d6898c947c4b /]# 
[ root@d6898c947c4b /]# netstat -ntpl |grep 22
tcp        000.0.0.0:220.0.0.0:*               LISTEN      44/sshd             
tcp6       00:::22:::*                    LISTEN      44/sshd             
[ root@d6898c947c4b /]# 
[ root@d6898c947c4b /]#        
[ root@d6898c947c4b /]# lsof -i:22
COMMAND PID USER   FD   TYPE   DEVICE SIZE/OFF NODE NAME
sshd     44 root    3u  IPv4 32153435      0t0  TCP *:ssh(LISTEN)
sshd     44 root    4u  IPv6 32153437      0t0  TCP *:ssh(LISTEN)[root@d6898c947c4b /]# 
[ root@d6898c947c4b /]# 
[ root@d6898c947c4b /]#

If the above results appear, it is considered a success.

Five, modify the root password#

[ root@d6898c947c4b /]# 
[ root@d6898c947c4b /]# passwd root
Changing password for user root.
New password: 
BAD PASSWORD: The password is shorter than 8 characters
Retype newpassword: 
passwd: all authentication tokens updated successfully.[root@d6898c947c4b /]#

Six, perform ssh remote login test#

1、 I use CRT connection

After the connection is successful