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Most people do not understand the knowledge points of this article "how to solve the Enabling NTP problem of CDH5.8.2", so the editor summarizes the following content, detailed content, clear steps, and has a certain reference value. I hope you can get something after reading this article. Let's take a look at this "how to solve the Enabling NTP problem of CDH5.8.2" article.

one。 problem

CDH requires that you configure the Network Time Protocol (NTP) service on each machine in your cluster.

To start NTP and configure it to run automatically on reboot, perform the following steps on each node in your cluster.

Error report:

1) the health of the host in this role is poor. The following health tests are bad: clock deviation.

2) The host's NTP service is not synchronized to any remote server.

two。 Solve

First configure a NTP service, and then all CDH nodes act as clients to this NTP service.

1. Install NTP (for each cluster)

[root@sht-sgmhadoopcm-01 ~] # yum install ntp

two。 Edit / etc/ntp.conf (each cluster)

[root@sht-sgmhadoopcm-01 ~] # vi / etc/ntp.conf

Server 0.pool.ntp.org

Server 1.pool.ntp.org

Server 2.pool.ntp.org

3. Configure NTP to boot automatically (each in the cluster)

[root@sht-sgmhadoopcm-01 ~] # chkconfig ntpd on

4. Enable NTP service (each in the cluster)

[root@sht-sgmhadoopcm-01 ~] # service ntp start

5. Synchronize ntp nodes (each cluster)

[root@sht-sgmhadoopcm-01] # hostname-I

172.16.101.54

Select the first one as the ntp server

[root@sht-sgmhadoopcm-01] # ntpdate-u 172.16.101.54

17 Nov 14:31:26 ntpdate [5450]: adjust time server 172.16.101.54 offset-0.000013 sec

6. Synchronization to system time (each cluster)

[root@sht-sgmhadoopcm-01] # hwclock-- systohc

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