hadoop yarn 8088 can not access

I encountered problems and solutions

/ etc / hosts in their host write is 127.0.0.1. can not actually write. Or should write their own ip address
127.0.0.1 server136
192.168.60.136 server136

Network text reproduced

1, turn off the firewall, different versions of centos command
2, if you're like me configure hostname instead of ip + port.

yarn-site.xml
<configuration>
 <property>
    <name>yarn.resourcemanager.hostname</name>
    <value>server71</value>
 </property>
    <property>
    <name>yarn.nodemanager.aux-services</name>
    <value>mapreduce_shuffle</value>
 </property>
</configuration>

Check the configuration as described above the following three profiles
/ etc / the hosts
/ etc / sysconfig / Network-scripts / the ifcfg-eth0
/ etc / sysconfig / Network

hostname command to see your host name and your own match
3, to see whether the port is occupied by other software. If your system is clean system, it is to engage in hadoop mirror. This may be small, see the previous two reasons, in particular the second.

Reference links

https://blog.csdn.net/kouryoushine/article/details/78401976
https://www.cnblogs.com/qifengle-2446/p/6424365.html