Docker容器向外提供服务
用分享04中的Nginx服务来试一下。
不过这次我直接用Nginx镜像创建容器，先下载Nginx镜像。
[root@promote ~]# docker search nginx
INDEX NAME DESCRIPTION STARS OFFICIAL AUTOMATED
docker.io docker.io/nginx Official build of Nginx. 8981 [OK]
docker.io docker.io/jwilder/nginx-proxy Automated Nginx reverse proxy for docker c... 1357 [OK]
docker.io docker.io/richarvey/nginx-php-fpm Container running Nginx + PHP-FPM capable ... 586 [OK]
docker.io docker.io/jrcs/letsencrypt-nginx-proxy-companion LetsEncrypt container to use with nginx as... 387 [OK]
docker.io docker.io/kong Open-source Microservice & API Management ... 203 [OK]
docker.io docker.io/webdevops/php-nginx Nginx with PHP-FPM 106 [OK]
docker.io docker.io/kitematic/hello-world-nginx A light-weight nginx container that demons... 102
docker.io docker.io/zabbix/zabbix-web-nginx-mysql Zabbix frontend based on Nginx web-server ... 58 [OK]
docker.io docker.io/bitnami/nginx Bitnami nginx Docker Image 54 [OK]
docker.io docker.io/1and1internet/ubuntu-16-nginx-php-phpmyadmin-mysql-5 ubuntu-16-nginx-php-phpmyadmin-mysql-5 36 [OK]
docker.io docker.io/linuxserver/nginx An Nginx container, brought to you by Linu... 36
docker.io docker.io/tobi312/rpi-nginx NGINX on Raspberry Pi / armhf 20 [OK]
docker.io docker.io/nginxdemos/nginx-ingress NGINX Ingress Controller for Kubernetes . ... 11
docker.io docker.io/blacklabelops/nginx Dockerized Nginx Reverse Proxy Server. 9 [OK]
docker.io docker.io/wodby/drupal-nginx Nginx for Drupal container image 9 [OK]
docker.io docker.io/webdevops/nginx Nginx container 8 [OK]
docker.io docker.io/centos/nginx-18-centos7 Platform for running nginx 1.8 or building... 6
docker.io docker.io/1science/nginx Nginx Docker images that include Consul Te... 4 [OK]
docker.io docker.io/centos/nginx-112-centos7 Platform for running nginx 1.12 or buildin... 3
docker.io docker.io/behance/docker-nginx Provides base OS, patches and stable nginx... 2 [OK]
docker.io docker.io/pebbletech/nginx-proxy nginx-proxy sets up a container running ng... 2 [OK]
docker.io docker.io/toccoag/openshift-nginx Nginx reverse proxy for Nice running on sa... 1 [OK]
docker.io docker.io/travix/nginx NGinx reverse proxy 1 [OK]
docker.io docker.io/ansibleplaybookbundle/nginx-apb An APB to deploy NGINX 0 [OK]
docker.io docker.io/mailu/nginx Mailu nginx frontend 0 [OK]还是优先使用官方镜像，将镜像拉取到本地。
[root@promote ~]# docker pull docker.io/nginx
Using default tag: latest
Trying to pull repository docker.io/library/nginx ...
latest: Pulling from docker.io/library/nginx
683abbb4ea60: Pull complete
a470862432e2: Pull complete
977375e58a31: Pull complete
Digest: sha256:a65beb8c90a08b22a9ff6a219c2f363e16c477b6d610da28fe9cba37c2c3a2ac
Status: Downloaded newer image for docker.io/nginx:latest查看一下本地镜像，看看是否下载成功。
[root@promote ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
docker.io/nginx latest 3c5a05123222 3 days ago 109 MB接着用刚下载好的镜像创建容器。
[root@promote ~]# docker run -d --name nginx -p 80:80 docker.io/nginx
09823eb382b49c72cde153bafa23170212d9ea0da5754d069c68c5e2d29b6a64使用-p选项将本地端口映射到容器端口，这里是将Centos的80端口映射到Nginx容器的80端口。
可以通过访问Centos的80端口查看Nginx是否安装成功。
可以看到Docker容器就是通过端口映射向外提供服务的。