Docker容器Centos容器安装openssh

前面在部署容器，使用docker容器作为jenkins的Slave节点时，会发现在使用centos作为镜像源拉去容器，不能正常连接，最后是因为centos的sshd的问题

下面专门是centos容器安装sshd的实验

1. 拉去centos的镜像

[root@node6 ~]# docker pull centos

[root@node6 ~]# docker images

REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
ubuntu              latest              775349758637        3 days ago          64.2MB
jenkins/jenkins     lts                 fac78e370c0b        6 days ago          568MB
centos              latest              0f3e07c0138f        4 weeks ago         220MB

2. 运行一个容器

[root@node6 ~]# docker run -it centos /bin/bash

安装相关软件

[root@f2320c5d3c54 /]# yum -y update

[root@f2320c5d3c54 /]# yum -y install net-tools passwd cracklib-dicts

3. 创建一个用户，并设置密码

[root@f2320c5d3c54 /]# useradd jenkins

[root@f2320c5d3c54 /]# echo "p@ssw0rd"|passwd --stdin jenkins

Changing password for user jenkins.
passwd: all authentication tokens updated successfully

4. 安装sshd

[root@f2320c5d3c54 /]# yum provides sshd

Last metadata expiration check: 0:15:20 ago on Mon Nov  4 17:33:23 2019.
openssh-server-7.8p1-4.el8.i686 : An open source SSH server daemon
Repo        : BaseOS
Matched from:
Filename    : /usr/sbin/sshd

openssh-server-7.8p1-4.el8.x86_64 : An open source SSH server daemon
Repo        : BaseOS
Matched from:
Filename    : /usr/sbin/sshd

[root@f2320c5d3c54 /]# yum -y install openssh-server-7.8p1-4.el8.x86_64

5. 安装一些其他应用

安装maven

[root@f2320c5d3c54 /]# yum -y install maven

yum安装maven会自己安装Java作为依赖

[root@f2320c5d3c54 /]# java -version

openjdk version "1.8.0_232"
OpenJDK Runtime Environment (build 1.8.0_232-b09)
OpenJDK 64-Bit Server VM (build 25.232-b09, mixed mode)

[root@f2320c5d3c54 /]# mvn -v

Apache Maven 3.5.4 (Red Hat 3.5.4-5)
Maven home: /usr/share/maven
Java version: 1.8.0_232, vendor: Oracle Corporation, runtime: /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.232.b09-0.el8_0.x86_64/jre
Default locale: en_US, platform encoding: ANSI_X3.4-1968
OS name: "linux", version: "3.10.0-957.27.2.el7.x86_64", arch: "amd64", family: "unix"

安装git

[root@f2320c5d3c54 /]# yum -y install git

6. 尝试启动sshd

[root@f2320c5d3c54 /]# /usr/sbin/sshd -D

Could not load host key: /etc/ssh/ssh_host_rsa_key
Could not load host key: /etc/ssh/ssh_host_ecdsa_key
Could not load host key: /etc/ssh/ssh_host_ed25519_key
sshd: no hostkeys available -- exiting.

[root@f2320c5d3c54 /]# ssh-keygen -q -t rsa -b 2048 -f /etc/ssh/ssh_host_rsa_key -N ''

[root@f2320c5d3c54 /]# ssh-keygen -q -t ecdsa -f /etc/ssh/ssh_host_ecdsa_key -N ''

[root@f2320c5d3c54 /]# ssh-keygen -t dsa -f /etc/ssh/ssh_host_ed25519_key -N ''

Generating public/private dsa key pair.
Your identification has been saved in /etc/ssh/ssh_host_ed25519_key.
Your public key has been saved in /etc/ssh/ssh_host_ed25519_key.pub.
The key fingerprint is:
SHA256:uE0sGjrBYgq2t30d0ICWRP3o4Mn+ZhnAH4TX/1riVsA root@f2320c5d3c54
The key's randomart image is:
+---[DSA 1024]----+
|    oo= .        |
|     = = .       |
|    o o = o      |
| .   + * o E     |
|ooo + O S   o    |
|=..o * O . . +   |
|..o.o . = o =    |
|  ..o. = . +     |
|   . .=.  .      |
+----[SHA256]-----+

[root@f2320c5d3c54 /]# /usr/sbin/sshd -D &

[root@f2320c5d3c54 /]# ps -a

PID TTY          TIME CMD
   507 pts/0    00:00:00 sshd
   508 pts/0    00:00:00 ps

7. 已经启动，sshd安装完成

退出，并保存到镜像

[root@f2320c5d3c54 /]# exit

[root@node6 ~]# docker ps -a

CONTAINER ID        IMAGE                 COMMAND                  CREATED             STATUS                      PORTS               NAMES
37e4f2be0a41        5f2bf26e3524          "/bin/bash"              19 minutes ago      Up 19 minutes                                   sweet_hypatia
f2320c5d3c54        centos                "/bin/bash"              40 minutes ago      Exited (0) 12 seconds ago                       compassionate_elbakyan
b119e7f28b50        jenkins/jenkins:lts   "/sbin/tini -- /usr/…"   4 hours ago         Exited (143) 3 hours ago                        jenkins_prod

[root@node6 ~]# docker commit f2320c5d3c54 centos_jenkins

sha256:deca1dcb74bebefb77f9f9ca4328131e52332815d766cace00a16702351e1f8a