第10章 HBase:Hadoop数据库
10.4 NTP时间同步
10.4.1 为什么需要时间同步
HBase的HMaster和HRegionServer启动失败,大多是因为集群时间不同步造成的。需要定时进行集群时间同步。
10.4.1 ntp服务端
(1)安装ntp
[root@node1 ~]# yum install -y ntp
.....
Installing:
ntp x86_64 4.2.6p5-25.el7.centos.2 updates 547 k
Installing for dependencies:
autogen-libopts x86_64 5.18-5.el7 base 66 k
ntpdate x86_64 4.2.6p5-25.el7.centos.2 updates 86 k
Transaction Summary
=============================================================================================================================================================================================
Install 1 Package (+2 Dependent packages)
Total download size: 699 k
Installed size: 1.6 M
Downloading packages:
(1/3): autogen-libopts-5.18-5.el7.x86_64.rpm | 66 kB 00:00:00
(2/3): ntpdate-4.2.6p5-25.el7.centos.2.x86_64.rpm | 86 kB 00:00:00
(3/3): ntp-4.2.6p5-25.el7.centos.2.x86_64.rpm | 547 kB 00:00:00
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Total 726 kB/s | 699 kB 00:00:00
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : autogen-libopts-5.18-5.el7.x86_64 1/3
Installing : ntpdate-4.2.6p5-25.el7.centos.2.x86_64 2/3
Installing : ntp-4.2.6p5-25.el7.centos.2.x86_64 3/3
Verifying : ntp-4.2.6p5-25.el7.centos.2.x86_64 1/3
Verifying : ntpdate-4.2.6p5-25.el7.centos.2.x86_64 2/3
Verifying : autogen-libopts-5.18-5.el7.x86_64 3/3
Installed:
ntp.x86_64 0:4.2.6p5-25.el7.centos.2
Dependency Installed:
autogen-libopts.x86_64 0:5.18-5.el7 ntpdate.x86_64 0:4.2.6p5-25.el7.centos.2
Complete!
[root@node1 ~]#
(2)配置/etc/ntp.conf
[root@node1 ~]# vi /etc/ntp.conf
只需将#restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap
修改为 restrict 192.168.80.0 mask 255.255.255.0 nomodify notrap
,给局域网内主机同步时间的权限,但不允许修改时间服务器的时间。
完整的配置文件如下:
[root@node1 ~]# cat /etc/ntp.conf
# 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 1.centos.pool.ntp.org iburst
server 2.centos.pool.ntp.org iburst
server 3.centos.pool.ntp.org iburst
#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
[root@node1 ~]#
(3)开机启动ntp
[root@node1 ~]# systemctl start ntpd
[root@node1 ~]# systemctl enable ntpd
Created symlink from /etc/systemd/system/multi-user.target.wants/ntpd.service to /usr/lib/systemd/system/ntpd.service.
[root@node1 ~]#
[root@node1 ~]# systemctl status ntpd
● ntpd.service - Network Time Service
Loaded: loaded (/usr/lib/systemd/system/ntpd.service; enabled; vendor preset: disabled)
Active: active (running) since Tue 2017-07-25 10:40:48 EDT; 3min 18s ago
Main PID: 2504 (ntpd)
CGroup: /system.slice/ntpd.service
└─2504 /usr/sbin/ntpd -u ntp:ntp -g
Jul 25 10:40:48 node1 ntpd[2504]: Listen and drop on 1 v6wildcard :: UDP 123
Jul 25 10:40:48 node1 ntpd[2504]: Listen normally on 2 lo 127.0.0.1 UDP 123
Jul 25 10:40:48 node1 ntpd[2504]: Listen normally on 3 ens32 192.168.80.131 UDP 123
Jul 25 10:40:48 node1 ntpd[2504]: Listen normally on 4 lo ::1 UDP 123
Jul 25 10:40:48 node1 ntpd[2504]: Listen normally on 5 ens32 fe80::20c:29ff:fe9c:13bd UDP 123
Jul 25 10:40:48 node1 ntpd[2504]: Listening on routing socket on fd #22 for interface updates
Jul 25 10:40:48 node1 ntpd[2504]: 0.0.0.0 c016 06 restart
Jul 25 10:40:48 node1 ntpd[2504]: 0.0.0.0 c012 02 freq_set kernel 0.000 PPM
Jul 25 10:40:48 node1 ntpd[2504]: 0.0.0.0 c011 01 freq_not_set
Jul 25 10:40:55 node1 ntpd[2504]: 0.0.0.0 c614 04 freq_mode
[root@node1 ~]#
10.4.2 ntp客户端
安装ntp客户端,只需安装ntpdate
[root@node2 ~]# yum install -y ntpdate
[root@node3 ~]# yum install -y ntpdate
时间同步
[root@node2 ~]# ntpdate 192.168.80.131
25 Jul 11:03:47 ntpdate[2243]: adjust time server 192.168.80.131 offset -0.014726 sec
[root@node2 ~]#
[root@node3 ~]# ntpdate 192.168.80.131
25 Jul 11:03:35 ntpdate[2228]: adjust time server 192.168.80.131 offset -0.034661 sec
[root@node3 ~]#
第10章 HBase:Hadoop数据库
10.4 NTP时间同步
10.4.1 为什么需要时间同步
HBase的HMaster和HRegionServer启动失败,大多是因为集群时间不同步造成的。需要定时进行集群时间同步。
10.4.1 ntp服务端
(1)安装ntp
[root@node1 ~]# yum install -y ntp
.....
Installing:
ntp x86_64 4.2.6p5-25.el7.centos.2 updates 547 k
Installing for dependencies:
autogen-libopts x86_64 5.18-5.el7 base 66 k
ntpdate x86_64 4.2.6p5-25.el7.centos.2 updates 86 k
Transaction Summary
=============================================================================================================================================================================================
Install 1 Package (+2 Dependent packages)
Total download size: 699 k
Installed size: 1.6 M
Downloading packages:
(1/3): autogen-libopts-5.18-5.el7.x86_64.rpm | 66 kB 00:00:00
(2/3): ntpdate-4.2.6p5-25.el7.centos.2.x86_64.rpm | 86 kB 00:00:00
(3/3): ntp-4.2.6p5-25.el7.centos.2.x86_64.rpm | 547 kB 00:00:00
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Total 726 kB/s | 699 kB 00:00:00
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : autogen-libopts-5.18-5.el7.x86_64 1/3
Installing : ntpdate-4.2.6p5-25.el7.centos.2.x86_64 2/3
Installing : ntp-4.2.6p5-25.el7.centos.2.x86_64 3/3
Verifying : ntp-4.2.6p5-25.el7.centos.2.x86_64 1/3
Verifying : ntpdate-4.2.6p5-25.el7.centos.2.x86_64 2/3
Verifying : autogen-libopts-5.18-5.el7.x86_64 3/3
Installed:
ntp.x86_64 0:4.2.6p5-25.el7.centos.2
Dependency Installed:
autogen-libopts.x86_64 0:5.18-5.el7 ntpdate.x86_64 0:4.2.6p5-25.el7.centos.2
Complete!
[root@node1 ~]#
(2)配置/etc/ntp.conf
[root@node1 ~]# vi /etc/ntp.conf
只需将#restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap
修改为 restrict 192.168.80.0 mask 255.255.255.0 nomodify notrap
,给局域网内主机同步时间的权限,但不允许修改时间服务器的时间。
完整的配置文件如下:
[root@node1 ~]# cat /etc/ntp.conf
# 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 1.centos.pool.ntp.org iburst
server 2.centos.pool.ntp.org iburst
server 3.centos.pool.ntp.org iburst
#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
[root@node1 ~]#
(3)开机启动ntp
[root@node1 ~]# systemctl start ntpd
[root@node1 ~]# systemctl enable ntpd
Created symlink from /etc/systemd/system/multi-user.target.wants/ntpd.service to /usr/lib/systemd/system/ntpd.service.
[root@node1 ~]#
[root@node1 ~]# systemctl status ntpd
● ntpd.service - Network Time Service
Loaded: loaded (/usr/lib/systemd/system/ntpd.service; enabled; vendor preset: disabled)
Active: active (running) since Tue 2017-07-25 10:40:48 EDT; 3min 18s ago
Main PID: 2504 (ntpd)
CGroup: /system.slice/ntpd.service
└─2504 /usr/sbin/ntpd -u ntp:ntp -g
Jul 25 10:40:48 node1 ntpd[2504]: Listen and drop on 1 v6wildcard :: UDP 123
Jul 25 10:40:48 node1 ntpd[2504]: Listen normally on 2 lo 127.0.0.1 UDP 123
Jul 25 10:40:48 node1 ntpd[2504]: Listen normally on 3 ens32 192.168.80.131 UDP 123
Jul 25 10:40:48 node1 ntpd[2504]: Listen normally on 4 lo ::1 UDP 123
Jul 25 10:40:48 node1 ntpd[2504]: Listen normally on 5 ens32 fe80::20c:29ff:fe9c:13bd UDP 123
Jul 25 10:40:48 node1 ntpd[2504]: Listening on routing socket on fd #22 for interface updates
Jul 25 10:40:48 node1 ntpd[2504]: 0.0.0.0 c016 06 restart
Jul 25 10:40:48 node1 ntpd[2504]: 0.0.0.0 c012 02 freq_set kernel 0.000 PPM
Jul 25 10:40:48 node1 ntpd[2504]: 0.0.0.0 c011 01 freq_not_set
Jul 25 10:40:55 node1 ntpd[2504]: 0.0.0.0 c614 04 freq_mode
[root@node1 ~]#
10.4.2 ntp客户端
安装ntp客户端,只需安装ntpdate
[root@node2 ~]# yum install -y ntpdate
[root@node3 ~]# yum install -y ntpdate
时间同步
[root@node2 ~]# ntpdate 192.168.80.131
25 Jul 11:03:47 ntpdate[2243]: adjust time server 192.168.80.131 offset -0.014726 sec
[root@node2 ~]#
[root@node3 ~]# ntpdate 192.168.80.131
25 Jul 11:03:35 ntpdate[2228]: adjust time server 192.168.80.131 offset -0.034661 sec
[root@node3 ~]#