hadoop无法启动 INFO ipc.Client: Retrying connect to server

18/01/07 02:05:32 INFO ipc.Client: Retrying connect to server: master/192.168.157.10:9000. Already tried 0 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS)

18/01/07 02:05:33 INFO ipc.Client: Retrying connect to server: master/192.168.157.10:9000. Already tried 1 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS)

18/01/07 02:05:34 INFO ipc.Client: Retrying connect to server: master/192.168.157.10:9000. Already tried 2 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS)

18/01/07 02:05:35 INFO ipc.Client: Retrying connect to server: master/192.168.157.10:9000. Already tried 3 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS)

18/01/07 02:05:36 INFO ipc.Client: Retrying connect to server: master/192.168.157.10:9000. Already tried 4 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS)

解决方法：

1、重启hadoop集群

* 进入hadoop的安装目录：cd /usr/local/src/bin

* 关闭所有节点： ./stop-all.sh

* namenode格式化：hadoop namenode-format (注意：选择Y)

* 开启所有的节点：./start-all.sh

2、防火墙没有关闭

* chkconfig iptables off：防火墙开机不自启动，并不是关闭防火墙

* 清空系统防火墙

iptables -F

* 保存防火墙配置

service iptables save

* 临时关闭内核防火墙

setenforce 0

* 永久关闭内核防火墙

vim /etc/selinux/config

SELINUX=disabled