相對於手動製做的docker鏡像,使用dockerfile構建的鏡像有如下優勢:docker
一、dockerfile只有幾kb,便於傳輸centos
二、使用dockerfile構建出來的鏡像,在運行容器的時候,不用指定容器的初始命令bash
三、支持更多的自定義操做ssh
FROM 這個鏡像的媽媽是誰?(指定基礎鏡像) MAINTAINER 告訴別人,誰負責養它?(指定維護者信息,能夠沒有) RUN 你想讓它幹啥(在命令前面加上RUN便可) ADD 給它點創業資金(COPY文件,會自動解壓) WORKDIR 我是cd,今天剛化了妝(設置當前工做目錄) VOLUME 給它一個存放行李的地方(設置卷,掛載主機目錄) EXPOSE 它要打開的門是啥(指定對外的端口)(-P 隨機端口) CMD 奔跑吧,兄弟!(指定容器啓動後的要乾的事情)(容易被替換)
COPY 複製文件 ENV 環境變量 ENTRYPOINT 容器啓動後執行的命令(沒法被替換,啓容器的時候指定的命令,會被當成參數
1:啓動容器安裝軟件服務tcp
docker run -it -p 1022:22 --name luoahong centos:6.9 ###### yum install openssh-server -y /etc/init.d/sshd start echo 123456|passwd --stdin root ######
2:將安裝好服務的容器commit提交爲鏡像測試
docker commit luoahong centos6-ssh:v1
3: 啓動新容器來測試新提交的鏡像ui
docker run -d -p 2022:22 centos6-ssh:v1 /usr/sbin/sshd -D
1:編寫dockerfileserver
[root@luoahong centos6_ssh]# pwd /opt/dockerfile/centos6_ssh [root@luoahong centos6_ssh]# ll total 4 -rw-r--r-- 1 root root 159 Jan 15 18:42 dockerfile [root@luoahong centos6_ssh]# cat dockerfile FROM centos:6.9 RUN yum install openssh-server -y RUN /etc/init.d/sshd start RUN echo 123456|passwd --stdin root CMD ["/usr/sbin/sshd","-D"]
2:docker build構建鏡像blog
[root@luoahong centos6_ssh]# docker build -t centos6-ssh:v2 .
3: 啓動新容器來測試新構建的鏡像ci
[root@luoahong centos6_ssh]# docker run -d -p 1322:22 centos6-ssh:v2 dc6ed1878218e7f13ac753cd5eec290eca1b1c06a1c4da6125b37e4d4f849c97 [root@luoahong centos6_ssh]# docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES dc6ed1878218 centos6-ssh:v2 "/usr/sbin/sshd -D" 5 seconds ago Up 4 seconds 0.0.0.0:1322->22/tcp cranky_colden ea82b9583081 centos6-ssh-httpd:v1 "/bin/bash /init.sh" About an hour ago Up About an hour 0.0.0.0:1122->22/tcp, 0.0.0.0:8080->80/tcp stupefied_rosalind 0d09d3a1591a centos:6.9 "/bin/bash" About an hour ago Exited (0) About an hour ago luoahong 156d80283acf centos6-ssh:v1 "/usr/sbin/sshd -D" About an hour ago Up About an hour 0.0.0.0:2022->22/tcp romantic_chandrasekhar 0485b9ecd1ad centos:6.9 "/bin/bash" 2 hours ago Exited (0) About an hour ago luoahong4
四、測試
[root@luoahong ~]# ssh root@192.168.228.134 -p 1322 The authenticity of host '[192.168.228.134]:1322 ([192.168.228.134]:1322)' can't be established. RSA key fingerprint is SHA256:F6zybEUDFDsU7O33NYhVZrwhSkANZvKhSEXDwc6+lVY. RSA key fingerprint is MD5:04:47:c1:09:1c:0f:46:48:1c:7c:7c:d7:22:71:54:7a. Are you sure you want to continue connecting (yes/no)? yes Warning: Permanently added '[192.168.228.134]:1322' (RSA) to the list of known hosts. root@192.168.228.134's password: [root@dc6ed1878218 ~]#
1:啓動容器安裝軟件服務
docker run -it -p 1022:22 --name luoahong centos:6.9 ###### yum install openssh-server -y /etc/init.d/sshd start echo 123456|passwd --stdin root ######
2:將安裝好服務的容器commit提交爲鏡像
docker commit luoahong centos6-ssh:v1
3: 啓動新容器來測試新提交的鏡像
docker run -d -p 2022:22 centos6-ssh:v1 /usr/sbin/sshd -D
1:編寫dockerfile
[root@luoahong centos6_ssh_http]# pwd /opt/dockerfile/centos6_ssh_http [root@luoahong centos6_ssh_http]# ll total 8 -rw-r--r-- 1 root root 193 Jan 15 18:57 dockerfile -rw-r--r-- 1 root root 54 Jan 15 19:02 init.sh [root@luoahong centos6_ssh_http]# cat dockerfile FROM centos:6.9 RUN yum install openssh-server httpd -y RUN /etc/init.d/sshd start RUN echo 123456|passwd --stdin root ADD init.sh /init.sh CMD [/bin/bash","/init.sh"]
編寫容器啓動腳本
[root@luoahong centos6_ssh_http]# cat init.sh #!/bin/bash /etc/init.d/httpd start /usr/sbin/sshd -D
[root@luoahong centos6_ssh_http]# docker build -t centos6-ssh-httpd:v2
[root@luoahong centos6_ssh_http]# docker run -d -p 8080:80 -p 2122:22 centos6-ssh-httpd:v2 a5ff3069084c82a9b7b5030d4ee21e172fdedb2160b71ccbfb3e63b6cb979552 docker: Error response from daemon: driver failed programming external connectivity on endpoint xenodochial_swartz (78dc457d720cb6611f611b12690499acbe168aae92eb7913b23950e4d71ba860): Bind for 0.0.0.0:8080 failed: port is already allocated. [root@luoahong centos6_ssh_http]# docker ps -a -l CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES a5ff3069084c centos6-ssh-httpd:v2 "/bin/sh -c [/bin/ba鈥? 4 seconds ago Created xenodochial_swartz