centos 实现ssh远程连接docker

摘要: 本文章描述的是centos7下安装了docker，并从官网获取了centos7。这里讲讲述从创建一个容器，安装openssh，创建一个带有ssh、jdk、tomcat的镜像。

一、查看当前镜像

[root@iZ25av9xi4hZ ~]# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
docker.io/centos    latest              980e0e4c79ec        3 weeks ago         196.7 MB
[root@iZ25av9xi4hZ ~]#

上面的centos 是通过docker pull centos拉取获得的最新centos7 版本

二、创建一个容器，并配置ssh、tomcat、jdk

2.1 创建一个容器（命名为base_centos）

[root@iZ25av9xi4hZ ~]# docker run -it --name base_centos  centos:latest  /bin/bash
[root@cf6b692adf02 /]#

2.2 安装net-tools, iproute

net-tools 可以使用ifconfig等命令

[root@cf6b692adf02 /]# yum install -y net-tools

iproute 可以使用ip add 查看网络配置

[root@cf6b692adf02 /]# yum install -y iproute

3、sshd安装，及配置

3.1 安装openssh

[root@cf6b692adf02 /]# yum install -y openssh
[root@cf6b692adf02 /]# yum install -y openssh-server
[root@cf6b692adf02 /]# yum install -y openssh-clients

3.2 配置私钥

输入 命令显示如下，分别配置私钥。其中输入的地方全部选择enter键跳过

[root@cf6b692adf02 /]#/usr/sbin/sshd
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

[root@cf6b692adf02 /]# ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key
Generating public/private rsa key pair.
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /etc/ssh/ssh_host_rsa_key.
Your public key has been saved in /etc/ssh/ssh_host_rsa_key.pub.
The key fingerprint is:
d6:46:9c:ef:bf:5d:45:95:59:50:b9:9b:fa:a6:1d:3d root@cf6b692adf02
The key's randomart image is:
+--[ RSA 2048]----+
|              .oO|
|         . .   +.|
|          +     o|
|         o .   o |
|        S o .   +|
|       . . .   oo|
|            . .Eo|
|             o.o+|
|             .*+.|
+-----------------+

[root@cf6b692adf02 /]# ssh-keygen -t ecdsa -f /etc/ssh/ssh_host_ecdsa_key
Generating public/private ecdsa key pair.
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /etc/ssh/ssh_host_ecdsa_key.
Your public key has been saved in /etc/ssh/ssh_host_ecdsa_key.pub.
The key fingerprint is:
7f:ad:3b:5f:93:c2:6e:f0:05:f8:75:80:18:f8:ba:83 root@cf6b692adf02
The key's randomart image is:
+--[ECDSA  256]---+
|         ..o .   |
|        . . . .  |
|         .  .  . |
|          .. . ..|
|        S.  . o .|
|        .. ..o ..|
|       . .. +ooo.|
|      E o  .o+...|
|         .  +=.  |
+-----------------+
[root@cf6b692adf02 /]#

[root@cf6b692adf02 /]# ssh-keygen -t ed25519 -f /etc/ssh/ssh_host_ed25519_key
Generating public/private ed25519 key pair.
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
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:
44:93:0d:94:eb:e2:a4:3e:a3:fe:ab:e7:4f:2e:f0:44 root@cf6b692adf02
The key's randomart image is:
+--[ED25519  256--+
|       .==       |
|       .o..      |
|        ..       |
|    E  ..        |
|   .   .S        |
|  . . o .        |
|   + +..         |
|    Bo.          |
| .+B=*o          |
+-----------------+
[root@cf6b692adf02 /]#

最后执行一次，再查看sshd进程，发现是启动的。

[root@cf6b692adf02 /]#ps -a | grep sshd
[root@cf6b692adf02 /]# /usr/sbin/sshd
[root@cf6b692adf02 /]# ps -ef | grep sshd
root       109     1  0 13:16 ?        00:00:00 /usr/sbin/sshd
root       128     1  0 13:22 ?        00:00:00 grep --color=auto sshd
[root@cf6b692adf02 /]#

将sshd 加入开机自启(/etc/rc.d/rc.local)

#!/bin/bash
# THIS FILE IS ADDED FOR COMPATIBILITY PURPOSES
#
# It is highly advisable to create own systemd services or udev rules
# to run scripts during boot instead of using this file.
#
# In contrast to previous versions due to parallel execution during boot
# this script will NOT be run after all other services.
#
# Please note that you must run 'chmod +x /etc/rc.d/rc.local' to ensure
# that this script will be executed during boot.

touch /var/lock/subsys/local
/usr/sbin/sshd

4、tomcat 安装及配置

4.1 安装wget命令

#yum install -y wget

4.2 下载tomcat8

[root@cf6b692adf02 tmp]# wget http://mirrors.cnnic.cn/apache/tomcat/tomcat-8/v8.5.5/bin/apache-tomcat-8.5.5.tar.gz[/code] 4.3 安装tomcat8，并加入开机自启

5、jdk 安装配置

[root@cf6b692adf02 tmp]#wget http://download.oracle.com/otn-pub/java/jdk/8u101-b13/jdk-8u101-linux-x64.rpm?AuthParam=1475328855_221393517c76253d935635ef2ec114d1 
[root@cf6b692adf02 tmp]#mv jdk-8u101-linux-x64.rpm?AuthParam=1475328855_221393517c76253d935635ef2ec114d1 jdk.rpm
[root@cf6b692adf02 tmp]#rpm -ivh jdk.rpm
Preparing...                          ################################# [100%]
Updating / installing...
1:jdk1.8.0_101-2000:1.8.0_101-fcs  ################################# [100%]
Unpacking JAR files...
tools.jar...
plugin.jar...
javaws.jar...
deploy.jar...
rt.jar...
jsse.jar...
charsets.jar...
localedata.jar...

[root@cf6b692adf02 tmp]# java -version
java version "1.8.0_101"
Java(TM) SE Runtime Environment (build 1.8.0_101-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.101-b13, mixed mode)
[root@cf6b692adf02 tmp]#

jdk rpm安装在/usr/java/jdk1.8.0_101/jre/bin/java

5、写脚本启动关闭tomcat

5.1 安装vim

[root@cf6b692adf02 tomcat]# yum install vim* -y


五、

5.1 创建新的镜像文件

将之前做的容器弄成镜像文件，取名base:latest

[root@iZ25av9xi4hZ ~]# docker commit cf6b692adf02 base:latest
sha256:a90294e9b9b5b375c895ff32bfd34120797e8391bdbcbfa53b3792d636280f70

查看镜像下载所有的镜像文件

[root@iZ25av9xi4hZ ~]# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
base                latest              a90294e9b9b5        2 minutes ago       934.9 MB
docker.io/centos    latest              980e0e4c79ec        3 weeks ago         196.7 MB
[root@iZ25av9xi4hZ ~]#

5.2创建tomcat_cl 容器，并设置其ssh对于宿主机器的10022端口，8080端口对应宿主机器的10088端口

[root@iZ25av9xi4hZ ~]# docker run  -p 10022:22 -p  10088:8080 --name tomcat_cl  -d  base:latest  /usr/sbin/sshd -D
e21a8af9269cd06b3950f59020de4d29723580c20bd35334ea6ff3fed28fb043
[root@iZ25av9xi4hZ ~]# docker ps
CONTAINER ID        IMAGE               COMMAND               CREATED             STATUS              PORTS                                            NAMES
e21a8af9269c        base:latest         "/usr/sbin/sshd -D"   7 seconds ago       Up 6 seconds        0.0.0.0:10022->22/tcp, 0.0.0.0:10088->8080/tcp   tomcat_cl
cf6b692adf02        centos:latest       "/bin/bash"           About an hour ago   Up 10 minutes                                                        base_centos
[root@iZ25av9xi4hZ ~]#

5.3 ssh登录容器

[root@iZ25av9xi4hZ ~]# ssh root@127.0.0.1 -p 10022
The authenticity of host '[127.0.0.1]:10022 ([127.0.0.1]:10022)' can't be established.
ECDSA key fingerprint is 7f:ad:3b:5f:93:c2:6e:f0:05:f8:75:80:18:f8:ba:83.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '[127.0.0.1]:10022' (ECDSA) to the list of known hosts.
root@127.0.0.1's password:
Permission denied, please try again.

开始没有创建密码，所以叫修改一下密码

[root@iZ25av9xi4hZ ~]# docker exec -it tomcat_cl /bin/bash
[root@e21a8af9269c /]# passwd
Changing password for user root.
New password:
BAD PASSWORD: The password is shorter than 8 characters
Retype new password:
passwd: all authentication tokens updated successfully.
[root@e21a8af9269c /]# exit
exit
[root@iZ25av9xi4hZ ~]#

再次ssh ，可以正常进入

[root@iZ25av9xi4hZ ~]# ssh root@127.0.0.1 -p 10022
root@127.0.0.1's password:
[root@e21a8af9269c ~]#


5.4 在宿主机器检查对应的映射端口

[root@iZ25av9xi4hZ ~]# ps -aux | grep 10022
root     17088  0.0  1.5 188360 15708 ?        Sl   22:41   0:00 docker-proxy -proto tcp -host-ip 0.0.0.0 -host-port 10022 -container-ip 192.168.0.3 -container-port 22
root     17218  0.0  0.0 112660   960 pts/3    S+   22:46   0:00 grep --color=auto 10022
[root@iZ25av9xi4hZ ~]# ps -aux | grep 10088
root     17079  0.0  1.5 131020 15652 ?        Sl   22:41   0:00 docker-proxy -proto tcp -host-ip 0.0.0.0 -host-port 10088 -container-ip 192.168.0.3 -container-port 8080
root     17226  0.0  0.0 112664   960 pts/3    S+   22:47   0:00 grep --color=auto 10088
[root@iZ25av9xi4hZ ~]#

进入容器去启动tomcat

[root@iZ25av9xi4hZ ~]# ssh root@127.0.0.1 -p 10022
root@127.0.0.1's password:
[root@e21a8af9269c ~]# ps -ef | grep java
root       178   162  0 14:52 pts/0    00:00:00 grep --color=auto java
[root@e21a8af9269c ~]# /app/apache-tomcat-cl/bin/startup.sh
Using CATALINA_BASE:   /app/apache-tomcat-cl
Using CATALINA_HOME:   /app/apache-tomcat-cl
Using CATALINA_TMPDIR: /app/apache-tomcat-cl/temp
Using JRE_HOME:        /usr
Using CLASSPATH:       /app/apache-tomcat-cl/bin/bootstrap.jar:/app/apache-tomcat-cl/bin/tomcat-juli.jar
Tomcat started.
[root@e21a8af9269c ~]# ps -ef | grep java                                                                                                                                         root       193     1 56 14:52 pts/0    00:00:02 /usr/bin/java -Djava.util.logging.config.file=/app/apache-tomcat-cl/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djdk.tls.ephemeralDHKeySize=2048 -classpath /app/apache-tomcat-cl/bin/bootstrap.jar:/app/apache-tomcat-cl/bin/tomcat-juli.jar -Dcatalina.base=/app/apache-tomcat-cl -Dcatalina.home=/app/apache-tomcat-cl -Djava.io.tmpdir=/app/apache-tomcat-cl/temp org.apache.catalina.startup.Bootstrap start
root       210   162  0 14:52 pts/0    00:00:00 grep --color=auto java
[root@e21a8af9269c ~]#

通过浏览器输入宿主ip：端口。可以看到tomcat运行起来了。



docker一个小的案例容器搞定，有什么错误的地方欢迎指出