When we start hive, we will encounter the problem that the router is unable to connect. At this time, the most likely problem is that the firewall is turned on. At this time, we just need to turn it off. Baidu is very simple.

  Another problem may be our IP address. Let’s start all Hadoop clusters: start-all.sh,

See if there are five processes showing that if it is missing, it may be that our I IP address has changed. At this time, we need to modify the hadoop-env.sh file, CD   ~/ hadoop/etc/hadoop

vi hadoop-env.sh

Just change our IP address.