标签:5000 centos server1 构建 镜像 Docker root docker
一、Docker镜像的分层
·Dockerfile中的每个指令都会创建一个新的镜像层
·镜像层将被缓存和复用
·当Dockerfile的指令修改了,复制的文件变化了,或者构建镜像时指定的变量不同了,对应的镜像层缓存就会失效
·某一层的镜像缓存失效之后,它之后的镜像层缓存都会失效
·镜像层是不可变的,如果在某一层中添加一个文件,然后在下一层中删除它,则镜像中依然会包含该文件
二、Docker镜像的创建
1、Docker镜像
·应用发布的标准格式
·支撑一个Docker容器的运用
2、Docker镜像的创建方法
(1)、基于已有镜像创建
将容器里面运行的程序及运行环境打包生成新的镜像
docker commit 【选项】 容器ID/名称 仓库名称:【标签】
·-m 说明信息
·-a 作者信息
·-p 生成过程中停止容器的运行
(2)、基于本地模板创建
·通过导入操作系统模板文件生成新的镜像
·使用wget命令导入为本地镜像
wget
http://download.openvz.org/template/precreated/debian-7.0-x86-minimal.tar.gz
·导入成功后可查看本地镜像信息
docker images | grep new
(3)、基于Dockerfile创建
·Dockerfile是由一组指令组成的文件
·Dockerfile结构四部分
基础镜像信息
维护者信息
镜像操作指令
容器启动时执行指令
·Dockerfile每行支持一条指令,每条指令可携带多个参数,支持使用以“#”号开头的注释
Dockerfile操作指令
三、私有仓库建立
[root@server1 apache]# docker pull registryUsing default tag: latest
latest: Pulling from library/registry
cbdbe7a5bc2a: Pull complete
47112e65547d: Pull complete
46bcb632e506: Pull complete
c1cc712bcecd: Pull complete
3db6272dcbfa: Pull complete
Digest: sha256:8be26f81ffea54106bae012c6f349df70f4d5e7e2ec01b143c46e2c03b9e551d
Status: Downloaded newer image for registry:latest
docker.io/library/registry:latest
[root@server1 apache]# vim /etc/docker/daemon.json
{
"insecure-registries": ["20.0.0.11:5000"],
"registry-mirrors": ["https://lyoy0ey2.mirror.aliyuncs.com"]
}
[root@server1 apache]# systemctl restart docker.service
[root@server1 apache]# docker create -it registry /bin/bash
b8fca969d55da2cd78b07750142498eda2ffe25428edbff1aa592fb4f08c20ed [root@server1 apache]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
b8fca969d55d registry "/entrypoint.sh /bin…" 6 seconds ago Created fervent_noether [root@server1 apache]# docker start b8fca969d55d
b8fca969d55d
[root@server1 apache]# docker run -d -p 5000:5000 -v /data/registry:/tmp/registry registry
de58e178a3172ecc8c52bcaf4063da21a5eb9a1605180add6a03a8064a257cf5
[root@server1 apache]# docker tag httpd:centos 20.0.0.10:5000/httpd
[root@server1 apache]# docker push 20.0.0.10:5000/httpd
The push refers to repository [20.0.0.10:5000/httpd]
7bf28fb5dbac: Pushed
35fc0f295312: Pushed
3069654c482f: Pushed
5eb6c74f0823: Pushed
174f56854903: Pushed
latest: digest: sha256:1782102d1c3c1231cd4c17035381e83dc2844547af30c9067a3f96334d585dba size: 1362 获取私有仓库列表
[root@server1 apache]# curl -XGET http://20.0.0.10:5000/v2/_catalog
{"repositories":["httpd"]} #显示上传成功 删除centos镜像
[root@server1 registry]# docker rmi 20.0.0.10:5000/httpd:latest 测试私有仓库下载
[root@server1 registry]# docker pull 20.0.0.10:5000/httpd
Using default tag: latest
latest: Pulling from httpd
2d473b07cdd5: Already exists
5e105bbe607b: Pull complete
0ce1bb40a734: Pull complete
bf8183ec3c05: Pull complete
1b093a1fad54: Pull complete
Digest: sha256:1782102d1c3c1231cd4c17035381e83dc2844547af30c9067a3f96334d585dba
Status: Downloaded newer image for 20.0.0.10:5000/httpd:latest
20.0.0.10:5000/httpd:latest
四、Docker数据卷
1、数据卷容器
[root@server1 www]# docker run --name web100 -v /data2 -v /data3 -it centos:7 /bin/bash [root@server1 registry]# docker run -it --volumes-from web100 --name db1 centos:7 /bin/bash [root@941d8414bc15 /]# ls
anaconda-post.log data3 home media proc sbin tmp
bin dev lib mnt root srv usr
data2 etc lib64 opt run sys var [root@ac1a1deff23d /]# ls
anaconda-post.log data3 home media proc sbin tmp
bin dev lib mnt root srv usr
data2 etc lib64 opt run sys var [root@ac1a1deff23d /]# cd data2
[root@ac1a1deff23d data2]# touch aa
[root@ac1a1deff23d data2]# ls
aa
[root@ac1a1deff23d data2]# cd /data3
[root@ac1a1deff23d data3]# touch bb
[root@ac1a1deff23d data3]# ls
bb [root@941d8414bc15 /]# cd data2
[root@941d8414bc15 data2]# ls
aa
[root@941d8414bc15 data2]# cd /data3
[root@941d8414bc15 data3]# ls
bb
2、端口映射
[root@server1 docker]# docker run -d -P httpd:centos8d2b86c97ac08628fb197d6fdbdabe883195fe43875f9e71efbca94ac559a0aa
[root@server1 docker]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
8d2b86c97ac0 httpd:centos "/run.sh" 5 seconds ago Up 4 seconds 0.0.0.0:32768->80/tcp amazing_northcutt [root@server1 docker]# docker run -d -p 2222:80 httpd:centos
cc7230fdf9c3a40b05733f94989740f488aafdcb6648093325f84fb0fe0f460d
[root@server1 docker]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
cc7230fdf9c3 httpd:centos "/run.sh" 6 seconds ago Up 5 seconds 0.0.0.0:2222->80/tcp heuristic_newton 3、容器互联 [root@server1 docker]# docker run -dit -P --name web11 centos:7 /bin/bash
5fa7635068c78b7c0fc331398ae5f4e393001c1f5c5f02072d11f3471f07e341 --name [root@server1 docker]# docker run -dit -P --name web22 --link web11:web11 centos:7 /bin/bash
b413c6cbf148cb7670084e8e31c24993e61f1cc83efb2eee4a1cd38ee1325ed7 --link [root@server1 docker]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
b413c6cbf148 centos:7 "/bin/bash" 3 minutes ago Up 3 minutes web22
5fa7635068c7 centos:7 "/bin/bash" 4 minutes ago Up 4 minutes web11 [root@server1 docker]# docker exec -it b413c6cbf148 /bin/bash [root@b413c6cbf148 /]# ping web11
PING web11 (172.17.0.5) 56(84) bytes of data.
64 bytes from web11 (172.17.0.5): icmp_seq=1 ttl=64 time=0.066 ms
64 bytes from web11 (172.17.0.5): icmp_seq=2 ttl=64 time=0.058 ms
64 bytes from web11 (172.17.0.5): icmp_seq=3 ttl=64 time=0.060 ms
--- web11 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2000ms
rtt min/avg/max/mdev = 0.058/0.061/0.066/0.007 ms [root@b413c6cbf148 /]# yum -y install net-tools
[root@b413c6cbf148 /]# ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 172.17.0.6 netmask 255.255.0.0 broadcast 172.17.255.255
ether 02:42:ac:11:00:06 txqueuelen 0 (Ethernet)
RX packets 7114 bytes 11320444 (10.7 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 3999 bytes 219299 (214.1 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
loop txqueuelen 1 (Local Loopback)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
标签:5000,centos,server1,构建,镜像,Docker,root,docker 来源: https://www.cnblogs.com/Xing88/p/14045575.html
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