1 Error:/bin/bash: /bin/java: No such file or directory
/bin/java不存在，则创建
sudo ln -s /opt/module/jdk1.8.0_162/bin/java /bin/java
running 219601408B beyond the 'VIRTUAL' memory limit.Container exited with a non-zero exit code 143
<property>
<name>yarn.nodemanager.vmem-check-enabled</name>
<value>false</value>
<description>Whether virtual memory limits will be enforced for containers</description>
</property>
<property>
<name>yarn.nodemanager.vmem-pmem-ratio</name>
<value>4</value>
<description>Ratio between virtual memory to physical memory when setting memory limits for containers</description>
</property>
最后重启虚拟机，重新执行实例就好了
2 使用sbin/start-dfs.sh，datanode不启动
清空datanode所在主机的tmp目录：
rm -fr data/tmp/dfs/data/current/
bin/hdfs namenode -format
3 集群时间同步
- 安装ntp
#安装
sudo yum install ntp
sudo yum install ntpdate
#启动
sudo service ntpd start
#设置开启启动
sudo chkconfig ntpd on
- 编辑 /etc/ntp.conf
修改这几行
# Hosts on local network are less restricted.
restrict 192.168.176.0 mask 255.255.255.0 nomodify notrap
# Use public servers from the pool.ntp.org project.
# Please consider joining the pool (http://www.pool.ntp.org/join.html). #server 0.centos.pool.ntp.org iburst
#server 1.centos.pool.ntp.org iburst
#server 2.centos.pool.ntp.org iburst
#server 3.centos.pool.ntp.org iburst
添加两行
server 127.127.1.0 #local clock
fudqe 127.127.1.0 stratum 10
配置如下内容，保证BIOS与系统时间同步
编辑 /etc/sysconfig/ntpd
添加
SYNC_HWCLOCK=YES
- 重启服务
sudo service ntpd restart
至此时间同步服务器设置完成 - 同步其他机器到时间服务器
sudo ntpdate namenode.hay.com - 创建定时任务
在root用户下执行
crontab -e
输入
0-59/10 * * * * /usr/sbin/ntpdate namenode.hay.com
