生产环境oracle rac集群搭建前期准备之NTP服务搭建

Posted 2021-04-30 黑白之道

大家好我是sean，因客户需求，首次在生产环境搭建ntp服务

硬件环境情况

准备2台独立服务器，分别为：

10.3.3.62/192.168.36.230  ntpd服务器，用于与外部公共ntpd同步标准时间

10.3.3.64/192.168.36.85  ntpd客户端，用于与ntpd同步时间

系统环境

Oracle linux7.3 x86_64

Oracle rac 集群版本 11.2.0.3

检测2台机器是否安装

[root@a05 ~]#  rpm -q ntp

ntp-4.2.6p5-28.0.1.el7.x86_64

如果已经安装则略过此步，否则使用yum进行安装，并设置系统开机自动启动并启动服务

yum -y install ntp

systemctl enable ntpd（如果设置了这一步还是开无法启动，那么执行systemctl disable chronyd.service ）

systemctl start ntpd

设置ntp服务器10.3.3.62

配置前先使用命令：ntpdate -u cn.pool.ntp.org，同步服务器

修改/etc/ntp.conf文件，红色字体是修改的内容

# For more information about this file, see the man pages

# ntp.conf(5), ntp_acc(5), ntp_auth(5), ntp_clock(5), ntp_misc(5), ntp_mon(5).

driftfile /var/lib/ntp/drift

# Permit time synchronization with our time source, but do not

# permit the source to query or modify the service on this system.

restrict default nomodify notrap nopeer noquery

# Permit all access over the loopback interface.  This could

# be tightened as well, but to do so would effect some of

# the administrative functions.

restrict 127.0.0.1

restrict ::1

# Hosts on local network are less restricted.

#restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap

restrict 192.168.36.0 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.rhel.pool.ntp.org iburst

#server 1.rhel.pool.ntp.org iburst

#server 2.rhel.pool.ntp.org iburst

#server 3.rhel.pool.ntp.org iburst

#server 2.cn.pool.ntp.org

#server 1.asia.pool.ntp.org

#server 2.asia.pool.ntp.org

#server 127.127.1.0

#broadcast 192.168.1.255 autokey        # broadcast server

#broadcastclient                        # broadcast client

#broadcast 224.0.1.1 autokey            # multicast server

#multicastclient 224.0.1.1              # multicast client

#manycastserver 239.255.254.254         # manycast server

#manycastclient 239.255.254.254 autokey # manycast client

#restrict 2.cn.pool.ntp.org nomodify notrap noquery

#restrict 1.asia.pool.ntp.org nomodify notrap noquery

restrict 127.127.1.0 nomodify notrap noquery

server 127.0.0.1 # local clock

fudge 127.0.0.1 stratum 10

# Enable public key cryptography.

#crypto

includefile /etc/ntp/crypto/pw

# Key file containing the keys and key identifiers used when operating

# with symmetric key cryptography.

keys /etc/ntp/keys

# Specify the key identifiers which are trusted.

#trustedkey 4 8 42

# Specify the key identifier to use with the ntpdc utility.

#requestkey 8

# Specify the key identifier to use with the ntpq utility.

#controlkey 8

# Enable writing of statistics records.

#statistics clockstats cryptostats loopstats peerstats

# Disable the monitoring facility to prevent amplification attacks using ntpdc

# monlist command when default restrict does not include the noquery flag. See

# CVE-2013-5211 for more details.

# Note: Monitoring will not be disabled with the limited restriction flag.

disable monitor

修改完成后重启ntpd服务systemctl restart ntpd

使用ntpq -p 查看网络中的NTP服务器，同时显示客户端和每个服务器的关系

使用ntpstat 命令查看时间同步状态，这个一般需要5-10分钟后才能成功连接和同步。所以，服务器启动后需要稍等下： 
刚启动的时候，一般是：

# ntpstat

unsynchronised

  time server re-starting

   polling server every 64 s

连接并同步后:

# ntpstat

synchronised to NTP server (202.112.10.36) at stratum 3

   time correct to within 275 ms

   polling server every 256 s

设置客户端：10.3.3.64

安装ntp服务并设置为自动启动，和前面的设置方式相同。然后编辑/etc/ntp.conf文件，红色字体为变化的内容。

# For more information about this file, see the man pages

# ntp.conf(5), ntp_acc(5), ntp_auth(5), ntp_clock(5), ntp_misc(5), ntp_mon(5).

driftfile /var/lib/ntp/drift

# Permit time synchronization with our time source, but do not

# permit the source to query or modify the service on this system.

restrict default nomodify notrap nopeer noquery

# Permit all access over the loopback interface.  This could

# be tightened as well, but to do so would effect some of

# the administrative functions.

restrict 127.0.0.1

restrict ::1

# Hosts on local network are less restricted.

#restrict 192.168.1.0 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 192.168.36.230

restrict 192.168.36.230 nomodify notrap noquery

server 127.0.0.1

fudge 127.0.0.1 stratum 10

#broadcast 192.168.1.255 autokey        # broadcast server

#broadcastclient                        # broadcast client

#broadcast 224.0.1.1 autokey            # multicast server

#multicastclient 224.0.1.1              # multicast client

#manycastserver 239.255.254.254         # manycast server

#manycastclient 239.255.254.254 autokey # manycast client

# Enable public key cryptography.

#crypto

includefile /etc/ntp/crypto/pw

# Key file containing the keys and key identifiers used when operating

# with symmetric key cryptography.

keys /etc/ntp/keys

# Specify the key identifiers which are trusted.

#trustedkey 4 8 42

# Specify the key identifier to use with the ntpdc utility.

#requestkey 8

# Specify the key identifier to use with the ntpq utility.

#controlkey 8

# Enable writing of statistics records.

#statistics clockstats cryptostats loopstats peerstats

# Disable the monitoring facility to prevent amplification attacks using ntpdc

# monlist command when default restrict does not include the noquery flag. See

# CVE-2013-5211 for more details.

# Note: Monitoring will not be disabled with the limited restriction flag.

disable monitor

ntpdate 192.168.36.230

Ntpdate -u 192.168.36.230

重启ntpd服务

#systemctl restart ntpd

启动后，查看同步情况

# ntpq -p

# ntpstat

后期发现oraclerac集群ntp报错

解决办法是需要填写到以下内容文件（每台机器都需要添加）

[root@rac1 ~]# cat /etc/sysconfig/ntpd

# Command line options for ntpd

#OPTIONS="-g"

OPTIONS="-x -u ntp:ntp -p /var/run/ntpd.pid"

SYNC_HWCLOCK=no

NTPDATE_OPTIONS=""

[root@rac2 ~]# cat /etc/sysconfig/ntpd

# Command line options for ntpd

#OPTIONS="-g"

OPTIONS="-x -u ntp:ntp -p /var/run/ntpd.pid"

SYNC_HWCLOCK=no

NTPDATE_OPTIONS=""

第一次在生产环境这样搞，不足之处请大家多多指点，自己折腾吧

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