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Docker 容器端口 80-“连接被拒绝”

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Docker 容器端口 80-“连接被拒绝”

Docker 文件内容 -

[root@ansiblecontrolnode dockerbuild]# cat Dockerfile

FROM centos:latest
MAINTAINER [email protected]
RUN yum update -y && yum install httpd net-tools -y
CMD ["apachectl","-D","FOREGROUND"]
EXPOSE 80

Ansible playbook - 创建新的 docker 镜像 -

[root@ansiblecontrolnode dockerbuild]# cat build_docker_image.yml
---
        - name: Build a docker image
          hosts: localhost
          gather_facts: no
          tasks:
                - name: Build a CENTOS (latest) docker image with fully updated and Webservice installed
                  docker_image:
                        path: /root/ANSIBLE/ANSIBLEDOCKER/dockerbuild/
                        name: docker-image-created-by-ansible
                        tag: ansibleexample
...

检查语法

[root@ansiblecontrolnode dockerbuild]# ansible-playbook 
build_docker_image.yml --syntax-check

playbook: build_docker_image.yml

使用安装了 http 的 ansible 构建 Docker 镜像 -

[root@ansiblecontrolnode dockerbuild]# ansible-playbook build_docker_image.yml

构建后 - 检查图像

[root@ansiblecontrolnode dockerbuild]# docker images

REPOSITORY                        TAG                 IMAGE ID            CREATED             SIZE
docker-image-created-by-ansible   ansibleexample      622e72211b67        35 minutes ago      449MB
centos                            latest              e934aafc2206        6 weeks ago         199MB

从 622e72211b67 图像中旋转第一个容器 -

[root@ansiblecontrolnode dockerbuild]# docker run -it --name httpimage 622e72211b67 bash

容器运行状态（暴露80端口）-

[root@ansiblecontrolnode dockerbuild]# docker ps -a
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
be452b97dda0        622e72211b67        "bash"              7 minutes ago       Up 7 minutes        80/tcp              httpimage

获取容器 IP 地址 -

[root@ansiblecontrolnode dockerbuild]# docker inspect --format '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}'  httpimage
172.17.0.2

[root@ansiblecontrolnode dockerbuild]# ping -c2 172.17.0.2

PING 172.17.0.2 (172.17.0.2) 56(84) bytes of data.
64 bytes from 172.17.0.2: icmp_seq=1 ttl=64 time=0.107 ms
64 bytes from 172.17.0.2: icmp_seq=2 ttl=64 time=0.058 ms

--- 172.17.0.2 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 999ms
rtt min/avg/max/mdev = 0.058/0.082/0.107/0.026 ms

[root@ansiblecontrolnode dockerbuild]# telnet 172.17.0.2 80
Trying 172.17.0.2...

telnet: connect to address 172.17.0.2: Connection refused

[root@ansiblecontrolnode dockerbuild]# curl http://172.17.0.2:80

curl: (7) Failed connect to 172.17.0.2:80; Connection refused

请指出这里出了什么问题？

谢谢，Dhirendra

答案1

请注意第一个输出之间的区别docker ps：

[root@ansiblecontrolnode dockerbuild]# docker ps -a
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
be452b97dda0        622e72211b67        "bash"              7 minutes ago       Up 7 minutes        80/tcp              httpimage

同一命令的第二个输出为：

[root@ansiblecontrolnode dockerbuild]# docker ps -a
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS               NAMES
bfe98153a77a        0f104cab653d        "apachectl -D FOREGR…"   41 seconds ago      Up 40 seconds       80/tcp              httpcontainer

首次尝试时，您使用以下命令启动容器：

docker run -it --name httpimage 622e72211b67 bash

第二次你使用这个命令：

docker run -tid --name httpcontainer 0f104cab653d

结果：第一次运行时，您启动的是 bash，而不是 apache。容器正在运行，但 apache 未运行，因此Connection refused当您尝试使用 curl 访问它时会出错。

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