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依赖

docker使用

安装docker
使用yum安装最新版本docker
yum install docker

查看docker版本

[root@localhost ~]# docker version
Client:
 Version:         1.13.1
 API version:     1.26
 Package version: 
Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

下载tomcat

[root@localhost ~]# docker pull tomcat
Using default tag: latest
Trying to pull repository docker.io/library/tomcat ... 
latest: Pulling from docker.io/library/tomcat
e9afc4f90ab0: Pull complete 
989e6b19a265: Pull complete 
af14b6c2f878: Pull complete 
5573c4b30949: Pull complete 
fb1a405f128d: Pull complete 
612a9f566fdc: Pull complete 
cf63ebed1142: Pull complete 
fbb20561cd50: Pull complete 
e99c920870d7: Pull complete 
b7f793f2be47: Pull complete 
Digest: sha256:81c2a95e5b1b5867229d75255abe54928d505deb81c8ff8949b61fde1a5d30a1
Status: Downloaded newer image for docker.io/tomcat:latest
[root@localhost ~]# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
docker.io/tomcat    latest              2eb5a120304e        3 weeks ago         647 MB

docker images查看本地仓库有哪些镜像。

启动tomcat

[root@localhost ~]# docker run -d -p 80:8080 tomcat:latest
162820979bc3ca1e9958b548ef06262ac34e2ddd9010b10ee52bfdf3a6ffca58
[root@localhost ~]# docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED              STATUS              PORTS                  NAMES
162820979bc3        tomcat:latest       "catalina.sh run"   About a minute ago   Up About a minute   0.0.0.0:80->8080/tcp   eloquent_spence

上面设置了端口映射，虚拟机的80端口映射到docker容器的tomcat的8080端口。这样就可以在虚拟机外部访问docker的内容了。
下图可以看到正常访问到tomcat了，但是不知道为何tomcat返回了404。

停止容器

[root@localhost ~]# docker stop 162820979bc3        
162820979bc3
[root@localhost ~]# docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES

服务停止后就无法再访问tomcat了：