生产环境实战spark （8）分布式集群 Hadoop集群WEBUI打不开问题解决
在上一步中安装了Hadoop集群，发现127.0.0.1:50070 页面无法打开。
1，master本地检查webui
在云平台master上直接打开浏览器，检查127.0.0.1：50070可以打开。
初步定位是防火墙的问题
2，关闭防火墙。
CentOS 7.0默认使用的是firewall作为防火墙,master和worker节点要关闭掉。
systemctl stop firewalld.service#停止firewall
systemctl disable firewalld.service #禁止firewall开机启动
firewall-cmd --state #查看默认防火墙状态
systemctl stop firewalld.service#停止firewall
systemctl disable firewalld.service #禁止firewall开机启动
firewall-cmd --state #查看默认防火墙状态
[root@master ~]# firewall-cmd --state
running
[root@master ~]# systemctl stop firewalld.service
[root@master ~]# systemctl disable firewalld.service
rm '/etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service'
rm '/etc/systemd/system/basic.target.wants/firewalld.service'
[root@master ~]# firewall-cmd --state
not running
[root@master ~]# ^C
[root@master ~]# ^C
[root@master ~]# cd /usr/local
[root@master local]# ls
bin etc games hadoop-2.6.5 include jdk1.8.0_121 lib lib64 libexec rhzf_setup_scripts rhzf_spark_setupTools sbin scala-2.11.8 share src
[root@master local]# cd hadoop-2.6.5
[root@master hadoop-2.6.5]# l
bash: l: command not found...
[root@master hadoop-2.6.5]# ls
bin etc file: include lib libexec LICENSE.txt logs NOTICE.txt README.txt sbin share tmp
[root@master hadoop-2.6.5]# cd sbin
[root@master sbin]# ls
distribute-exclude.sh hdfs-config.sh refresh-namenodes.sh start-balancer.sh start-yarn.cmd stop-balancer.sh stop-yarn.cmd
hadoop-daemon.sh httpfs.sh slaves.sh start-dfs.cmd start-yarn.sh stop-dfs.cmd stop-yarn.sh
hadoop-daemons.sh kms.sh start-all.cmd start-dfs.sh stop-all.cmd stop-dfs.sh yarn-daemon.sh
hdfs-config.cmd mr-jobhistory-daemon.sh start-all.sh start-secure-dns.sh stop-all.sh stop-secure-dns.sh yarn-daemons.sh
[root@master sbin]# stop-dfs.sh
Stopping namenodes on [Master]
Master: stopping namenode
worker03: stopping datanode
worker04: stopping datanode
worker01: stopping datanode
worker02: stopping datanode
master: no datanode to stop
Stopping secondary namenodes [0.0.0.0]
0.0.0.0: stopping secondarynamenode
[root@master sbin]# start-dfs.sh
Starting namenodes on [Master]
Master: starting namenode, logging to /usr/local/hadoop-2.6.5/logs/hadoop-root-namenode-master.out
worker03: starting datanode, logging to /usr/local/hadoop-2.6.5/logs/hadoop-root-datanode-worker03.out
master: starting datanode, logging to /usr/local/hadoop-2.6.5/logs/hadoop-root-datanode-master.out
worker04: starting datanode, logging to /usr/local/hadoop-2.6.5/logs/hadoop-root-datanode-worker04.out
worker02: starting datanode, logging to /usr/local/hadoop-2.6.5/logs/hadoop-root-datanode-worker02.out
worker01: starting datanode, logging to /usr/local/hadoop-2.6.5/logs/hadoop-root-datanode-worker01.out
Starting secondary namenodes [0.0.0.0]
0.0.0.0: starting secondarynamenode, logging to /usr/local/hadoop-2.6.5/logs/hadoop-root-secondarynamenode-master.out
[root@master sbin]# Last login: Wed Apr 19 16:15:55 2017 from 132.150.75.19
[root@worker01 ~]# systemctl stop firewalld.service
systemctl disable firewalld.service [root@worker01 ~]# systemctl disable firewalld.service
rm '/etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service'
rm '/etc/systemd/system/basic.target.wants/firewalld.service'
[root@worker01 ~]# firewall-cmd --state
not running
[root@worker01 ~]#
Last login: Wed Apr 19 16:16:00 2017 from 132.150.75.19
[root@worker02 ~]# systemctl stop firewalld.service
systemctl disable firewalld.service
[root@worker02 ~]# systemctl disable firewalld.service
rm '/etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service'
rm '/etc/systemd/system/basic.target.wants/firewalld.service'
[root@worker02 ~]# firewall-cmd --state
not running
[root@worker02 ~]# Last login: Wed Apr 19 16:16:05 2017 from 132.150.75.19
[root@worker03 ~]# systemctl stop firewalld.service
systemctl disable firewalld.service [root@worker03 ~]# systemctl disable firewalld.service
rm '/etc/systemd/system/basic.target.wants/firewalld.service'
rm '/etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service'
[root@worker03 ~]# firewall-cmd --state
not running
[root@worker03 ~]# Last login: Wed Apr 19 16:16:09 2017 from 132.150.75.19
[root@worker04 ~]# systemctl stop firewalld.service
systemctl disable firewalld.service
[root@worker04 ~]# systemctl disable firewalld.service
rm '/etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service'
rm '/etc/systemd/system/basic.target.wants/firewalld.service'
[root@worker04 ~]# firewall-cmd --state
not running
[root@worker04 ~]#
