1. docker 镜像启动成功但是无法访问

2. 首先判断是否为防火墙关闭

   1:查看防火状态

   systemctl status firewalld

   service  iptables status 

   2:暂时关闭防火墙

   systemctl stop firewalld

   service  iptables stop 

   3:永久关闭防火墙

   systemctl disable firewalld

   chkconfig iptables off

   4:重启防火墙

   systemctl enable firewalld

   service iptables restart  

   5:永久关闭后重启

   //暂时还没有试过

   chkconfig iptables on

3. 解决办法：
   vi /etc/sysctl.conf
   或者
   vi /usr/lib/sysctl.d/00-system.conf
   添加如下代码：
   net.ipv4.ip_forward=1
   重启network服务
   systemctl restart network
   查看是否修改成功
   sysctl net.ipv4.ip_forward
   如果返回为“net.ipv4.ip_forward = 1”则表示成功了

4. 外网不能访问docker容器解决方案

[root@linux ~]# systemctl stop firewalld.service
[root@linux ~]# systemctl disable firewalld.service
[root@linux ~]# sed -ri '/SELINUX=enforcing/cSELINUX=disabled' /etc/sysconfig/selinux
[root@linux ~]# setenforce 0

[root@linux ~]# echo "1" > /proc/sys/net/ipv4/ip_forward

[root@linux ~]# sysctl -p

net.ipv4.ip_forward = 1

[root@linux ~]#[root@linux ~]# docker run -d --name tomcat02 -p 9527:8080 tomcat:latest

[root@linux ~]# docker exec -it tomcat02 /bin/bash
root@2cb65acbee53:/usr/local/tomcat# ls -l
total 136
-rw-r--r--. 1 root root 18982 Apr  3 12:06 BUILDING.txt
-rw-r--r--. 1 root root  5409 Apr  3 12:06 CONTRIBUTING.md
-rw-r--r--. 1 root root 57092 Apr  3 12:06 LICENSE
-rw-r--r--. 1 root root  2333 Apr  3 12:06 NOTICE
-rw-r--r--. 1 root root  3255 Apr  3 12:06 README.md
-rw-r--r--. 1 root root  6898 Apr  3 12:06 RELEASE-NOTES
-rw-r--r--. 1 root root 16262 Apr  3 12:06 RUNNING.txt
drwxr-xr-x. 2 root root  4096 Apr 24 23:49 bin
drwxr-xr-x. 3 root root  4096 May 23 08:41 conf
drwxr-xr-x. 2 root root    78 Apr 24 23:49 include
drwxr-xr-x. 2 root root  4096 Apr 24 23:49 lib
drwxrwxrwx. 2 root root  4096 May 23 08:41 logs
drwxr-xr-x. 3 root root  4096 Apr 24 23:49 native-jni-lib
drwxrwxrwx. 2 root root    30 Apr 24 23:49 temp
drwxr-xr-x. 2 root root     6 Apr 24 23:49 webapps
drwxr-xr-x. 7 root root    81 Apr  3 12:04 webapps.dist
drwxrwxrwx. 2 root root     6 Apr  3 12:02 work
root@2cb65acbee53:/usr/local/tomcat# cp -r webapps.dist/* webapps
root@2cb65acbee53:/usr/local/tomcat#

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