Cloudera Manager安装之时间服务器和时间客户端（Ubuntu14.04）（二）
找一台机器作为时间服务器
我这里，放到ubuntucmbigdata1这台机器！
注意，之前是已经做了集群时间同步了。
在ubuntu系统里，跟centos系统有点出入。
需要安装
[email protected]:~# sudo apt-get install ntp
然后，再来配置，就不为空了。
[email protected]:~# sudo vim /etc/ntp.conf
默认是如下
# /etc/ntp.conf, configuration for ntpd; see ntp.conf(5) for help driftfile /var/lib/ntp/ntp.drift # Enable this if you want statistics to be logged. #statsdir /var/log/ntpstats/ statistics loopstats peerstats clockstats filegen loopstats file loopstats type day enable filegen peerstats file peerstats type day enable filegen clockstats file clockstats type day enable # Specify one or more NTP servers. # Use servers from the NTP Pool Project. Approved by Ubuntu Technical Board # on 2011-02-08 (LP: #104525). See http://www.pool.ntp.org/join.html for # more information. server 0.ubuntu.pool.ntp.org server 1.ubuntu.pool.ntp.org server 2.ubuntu.pool.ntp.org server 3.ubuntu.pool.ntp.org # Use Ubuntu's ntp server as a fallback. server ntp.ubuntu.com # Access control configuration; see /usr/share/doc/ntp-doc/html/accopt.html for # details. The web page <http://support.ntp.org/bin/view/Support/AccessRestrictions> # might also be helpful. # # Note that "restrict" applies to both servers and clients, so a configuration # that might be intended to block requests from certain clients could also end # up blocking replies from your own upstream servers. # By default, exchange time with everybody, but don't allow configuration. restrict -4 default kod notrap nomodify nopeer noquery restrict -6 default kod notrap nomodify nopeer noquery # Local users may interrogate the ntp server more closely. restrict 127.0.0.1 restrict ::1 # Clients from this (example!) subnet have unlimited access, but only if # cryptographically authenticated. #restrict 192.168.123.0 mask 255.255.255.0 notrust # If you want to provide time to your local subnet, change the next line. # (Again, the address is an example only.) #broadcast 192.168.123.255 # If you want to listen to time broadcasts on your local subnet, de-comment the # next lines. Please do this only if you trust everybody on the network! #disable auth #broadcastclient
注意，这里有2处地方需要我们进行修改，如下
因为，
所以，修改地方1：
注意，Ubuntu系统的时间同步这块，跟centos系统有点出入。
[email protected]:~# sudo cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime [email protected]:~# ntpdate pool.ntp.org 25 Jun 17:10:14 ntpdate[9227]: the NTP socket is in use, exiting [email protected]:~# date 2017年 06月 25日 星期日 17:10:23 CST [email protected]:~#
ubuntucmbigdata1、ubuntucmbigdata2、ubuntucmbigdata3、ubuntucmbigdata4都去执行。
修改linux swap空间的swappiness
Cloudera 建议将 /proc/sys/vm/swappiness 设置为 0。
修改swappiness的值为零：
[email protected]:~# cat /proc/sys/vm/swappiness 60 [email protected]:~# echo 0 > /proc/sys/vm/swappiness [email protected]:~# cat /proc/sys/vm/swappiness 0 [email protected]:~#
我这里，仅拿ubuntucmbigdata1来说，其他的ubuntucmbigdata2、ubuntucmbigdata3和ubuntucmbigdata4是一样的。
本文转自大数据躺过的坑博客园博客，原文链接：http://www.cnblogs.com/zlslch/p/7078457.html，如需转载请自行联系原作者