1.建立Dockerfile文件html
新建一個目錄,在裏面新建一個dockerfile文件(新建一個的目錄,主要是爲了和以防和其它dockerfile混亂 )nginx
[root@docker01 myfiles]# mkdir centos6.8_dockerfile
[root@docker01 myfiles]#
[root@docker01 myfiles]# cd centos6.8_dockerfile/
建立dockerfile文件(vim Dockerfile)docker
# The dockerfile has Change add sshd services on Centos7.0 #centos7:latest image FROM centos:6.8 MAINTAINER xxx,http://www.cnblogs.com/xxx #Install sshd net-tools RUN yum install openssh-server net-tools -y RUN mkdir /var/run/sshd #Set password for root RUN echo 'root:xxxxxxx' | chpasswd RUN sed -i 's/PermitRootLogin prohibit-password/PermitRootLogin yes/' /etc/ssh/sshd_config #Set history record ENV HISTTIMEFORMAT "%F %T " #Fix sshd service:Read from socket failed: Connection reset by peer? RUN ssh-keygen -A #Change timezone CST RUN \cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime #Open 22 port EXPOSE 22 #Auto running sshd service CMD ["/usr/sbin/sshd","-D"]
上述文件內容就是一個dockerfile 常見的命令組合。開頭帶#號的爲註釋vim
文件解釋: FROM: 必不可少的命令,從某個鏡像做爲基。如 FROM <image_name> ,或者 FROM <image_name>:<tag>. 若是不加tag,默認爲latest。先從本地鏡像倉庫去搜索基鏡像,如過本地沒有,在去網上docker registry去尋找。 MAINTAINER:標明該Dockerfile做者及聯繫方式,可忽略不寫 RUN:創建新的鏡像時,能夠執行在系統裏的命令,如安裝特定的軟件以及設置環境變量。 ENV:設置系統環境變量(注意:寫在/etc/profile裏的命令在dockerfile這裏會不生效,因此爲改爲ENV的方式) EXPOSE:開放容器內的端口,但不和宿主機進行映射。方便在宿主機上進行開發測試。(如需映射到宿主機端口,可在運行容器時使用 -p host_port:container_port) CMD:設置執行的命令,常常用於容器啓動時指定的某個操做。如執行自定義腳本服務,或者是執行系統命令。CMD 只能存在一條,如在Dockerfile中有多條CMD的話,只有最後一條CMD生效!
2.執行build 建立鏡像centos
使用docker build命令來建立鏡像ssh
[root@docker01 centos6.8_dockerfile]# docker build -t centos_ssh_1_6.8 . Sending build context to Docker daemon 15.36 kB Step 1/10 : FROM centos:6.8 ---> 0cd976dc0a98 Step 2/10 : MAINTAINER xxx,http://www.cnblogs.com/xxx ---> Using cache ---> 025bdf5382de Step 3/10 : RUN yum install openssh-server net-tools -y ---> Using cache ---> f970cedf0dc6 Step 4/10 : RUN mkdir /var/run/sshd ---> Using cache ---> 620754832e8c Step 5/10 : RUN echo 'root:xxxxxxx' | chpasswd ---> Using cache ---> 8bcd6f4ae32b Step 6/10 : RUN sed -i 's/PermitRootLogin prohibit-password/PermitRootLogin yes/' /etc/ssh/sshd_config ---> Using cache ---> b46214833685 Step 7/10 : ENV HISTTIMEFORMAT "%F %T " ---> Using cache ---> c18c2102a92e Step 8/10 : RUN \cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime ---> Running in 77698b6cfce0 ---> 0e755b7f8c4a Removing intermediate container 77698b6cfce0 Step 9/10 : EXPOSE 22 ---> Running in 29ab858378f7 ---> 3c8c969057c4 Removing intermediate container 29ab858378f7 Step 10/10 : CMD /usr/sbin/sshd -D ---> Running in 8ebd12375b64 ---> ff004247b678 Removing intermediate container 8ebd12375b64 Successfully built ff004247b678 [root@docker01 centos6.8_dockerfile]#
-t 選項來docker build新的鏡像以便於標記構建的鏡像,. 表示當前目錄,也能夠指定dockerfile 文件所在目錄。socket
3.查看鏡像列表,並建立容器tcp
[root@docker01 centos6.8_dockerfile]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE centos_ssh_1_6.8 latest ff004247b678 About a minute ago 291 MB nginx_diy latest e24d0b283207 About an hour ago 109 MB nginx latest 34678a414b84 About an hour ago 109 MB docker01.lo:5000/nginx latest 958a7ae9e569 3 weeks ago 109 MB nginx <none> 958a7ae9e569 3 weeks ago 109 MB registry latest 9d0c4eabab4d 6 weeks ago 33.2 MB swarm latest 36b1e23becab 5 months ago 15.9 MB centos 6.8 0cd976dc0a98 9 months ago 195 MB
4.建立和查看容器測試
[root@docker01 centos6.8_dockerfile]# docker run -d -it --name mycentos centos_ssh_1_6.8 813171a387c2cc2a2c91ce96815e300c70bf1d42b6bd9e5c83f2d4608a2a2e6b [root@docker01 centos6.8_dockerfile]# docker exec mycentos hostname -I 172.17.0.3 [root@docker01 centos6.8_dockerfile]# ssh root@172.17.0.3 date Read from socket failed: Connection reset by peer [root@docker01 centos6.8_dockerfile]# docker exec mycentos netstat -ntpl Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1/sshd tcp 0 0 :::22 :::* LISTEN 1/sshd
原文連接:http://www.cnblogs.com/hanyifeng/p/6116067.htmlui