[root@localhost sysctl.d]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
3.拉取镜像
docker pull tomcat:8 ##version 如果很慢请参照：docker pull centos慢问题的解决方案
[root@localhost sysctl.d]# docker pull tomcat:8
Trying to pull repository docker.io/library/tomcat ...
8: Pulling from docker.io/library/tomcat
22dbe790f715: Pull complete
0250231711a0: Pull complete
6fba9447437b: Pull complete
4afad9c4aba6: Pull complete
12fce9923c9d: Pull complete
0dd81083d77e: Pull complete
4c2afc6ff72d: Pull complete
a62332a260f5: Pull complete
96dfb5ad080f: Pull complete
782f63228ce1: Pull complete
d610fffe30ad: Pull complete
Digest: sha256:aacce4e5ca37a3b8241c544deffd65f4cafbfb1a2fb2066f97621253c34f7dc4
Status: Downloaded newer image for docker.io/tomcat:8
[root@localhost sysctl.d]#
验证
docker images
[root@localhost sysctl.d]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
docker.io/tomcat 8 dd6ff929584a 2 weeks ago 463 MB
[root@localhost sysctl.d]#
4.启动tomcat
docker run -d -p 8080:8080 tomcat ####前者是外部访问端口，后者是容器内映射端口
如下命令可后台启动tomcat
-d: 后台运行容器，并返回容器ID；
-i: 以交互模式运行容器，通常与 -t 同时使用；
-t: 为容器重新分配一个伪输入终端，通常与 -i 同时使用；
[root@localhost sysctl.d]# docker run -d -p 8080:8080 tomcat
Unable to find image 'tomcat:latest' locally
Trying to pull repository docker.io/library/tomcat ...
latest: Pulling from docker.io/library/tomcat
Digest: sha256:aacce4e5ca37a3b8241c544deffd65f4cafbfb1a2fb2066f97621253c34f7dc4
Status: Downloaded newer image for docker.io/tomcat:latest
6a3c7c96df932566cc24cf7811ba774eb4c3f59f498ffc79d9f576ba2c589d04
5.查看运行中的容器