（7）centos7 同步服务器时间

r囧r小猫 2022-12-27 12:55 298阅读 0赞

一、服务器配置

1、查看服务器、客户端操作系统版本

  1. [root@hadoop101 ~]# cat /etc/redhat-release
  2. CentOS Linux release 7.6.1810 (Core)

2、查看服务器是否安装ntp，系统默认安装ntpdate；

  1. [root@hadoop101 ~]# rpm -qa | grep ntp
  2. fontpackages-filesystem-1.44-8.el7.noarch
  3. ntpdate-4.2.6p5-28.el7.centos.x86_64
  4. python-ntplib-0.3.2-1.el7.noarch
  5. ntp-4.2.6p5-28.el7.centos.x86_64

3、安装ntp ntpdate，其中ntpdate默认安装，可以只安装ntp；

  1. yum install ntp ntpdate -y

4、查看是否已安装完成，与第2步对比

  1. [root@hadoop101 mysql-libs]# rpm -qa | grep ntp
  2. fontpackages-filesystem-1.44-8.el7.noarch
  3. ntpdate-4.2.6p5-28.el7.centos.x86_64
  4. ntp-4.2.6p5-28.el7.centos.x86_64
  5. python-ntplib-0.3.2-1.el7.noarch

5、查看ntp服务器状态，两条命令效果一样

  1. [root@hadoop101 ~]# systemctl status ntpd
  2. ● ntpd.service - Network Time Service
  3. Loaded: loaded (/usr/lib/systemd/system/ntpd.service; disabled; vendor preset: disabled)
  4. Active: inactive (dead)

或

  1. [root@hadoop101 ~]# service ntpd status
  2. Redirecting to /bin/systemctl status ntpd.service
  3. ● ntpd.service - Network Time Service
  4. Loaded: loaded (/usr/lib/systemd/system/ntpd.service; disabled; vendor preset: disabled)
  5. Active: inactive (dead)

6、修改配置文件，使该NTP服务器在不联网的情况下，使用本服务器的时间作为同步时间

  1. vim /etc/ntp.conf

把如下四行代码注释掉

  1. #server 0.centos.pool.ntp.org iburst
  2. #server 1.centos.pool.ntp.org iburst
  3. #server 2.centos.pool.ntp.org iburst
  4. #server 3.centos.pool.ntp.org iburst

在下面再添加两行

  1. server 127.127.1.0 
  2. fudge  127.127.1.0 stratum 0

配置后：

复制代码

  1. [root@hadoop101 ~]# vim /etc/ntp.conf
  2. # For more information about this file, see the man pages
  3. # ntp.conf(5), ntp_acc(5), ntp_auth(5), ntp_clock(5), ntp_misc(5), ntp_mon(5).
  5. driftfile /var/lib/ntp/drift
  7. # Permit time synchronization with our time source, but do not
  8. # permit the source to query or modify the service on this system.
  9. restrict default nomodify notrap nopeer noquery
  11. # Permit all access over the loopback interface.  This could
  12. # be tightened as well, but to do so would effect some of
  13. # the administrative functions.
  14. restrict 127.0.0.1
  15. restrict ::1
  17. # Hosts on local network are less restricted.
  18. #restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap
  20. # Use public servers from the pool.ntp.org project.
  21. # Please consider joining the pool (http://www.pool.ntp.org/join.html).
  22. #server 0.centos.pool.ntp.org iburst
  23. #server 1.centos.pool.ntp.org iburst
  24. #server 2.centos.pool.ntp.org iburst
  25. #server 3.centos.pool.ntp.org iburst
  26. server 127.127.1.0
  27. fudge  127.127.1.0 stratum 0
  29. #broadcast 192.168.1.255 autokey        # broadcast server
  30. #broadcastclient                        # broadcast client
  31. #broadcast 224.0.1.1 autokey            # multicast server
  32. #multicastclient 224.0.1.1              # multicast client
  33. #manycastserver 239.255.254.254         # manycast server
  34. #manycastclient 239.255.254.254 autokey # manycast client
  36. # Enable public key cryptography.
  37. #crypto
  39. includefile /etc/ntp/crypto/pw
  41. # Key file containing the keys and key identifiers used when operating
  42. # with symmetric key cryptography.
  43. keys /etc/ntp/keys
  45. # Specify the key identifiers which are trusted.
  46. #trustedkey 4 8 42
  48. # Specify the key identifier to use with the ntpdc utility.
  49. #requestkey 8
  51. # Specify the key identifier to use with the ntpq utility.
  52. #controlkey 8
  54. # Enable writing of statistics records.

复制代码

7、启动ntp服务

  1. systemctl start ntpd

或

  1. service ntpd start

8、再次查看服务器状态是否配置成功

复制代码

  1. [root@hadoop101 mysql-libs]# systemctl status ntpd
  2. ● ntpd.service - Network Time Service
  3.    Loaded: loaded (/usr/lib/systemd/system/ntpd.service; disabled; vendor preset: disabled)
  4.    Active: active (running) since Fri 2019-08-16 18:33:01 CST; 13s ago
  5.   Process: 8792 ExecStart=/usr/sbin/ntpd -u ntp:ntp $OPTIONS (code=exited, status=0/SUCCESS)
  6.  Main PID: 8794 (ntpd)
  7.     Tasks: 1
  8.    CGroup: /system.slice/ntpd.service
  9.            └─8794 /usr/sbin/ntpd -u ntp:ntp -g
  11. Aug 16 18:33:01 hadoop101.com ntpd[8794]: Listen normally on 3 ...
  12. Aug 16 18:33:01 hadoop101.com ntpd[8794]: Listen normally on 4 ...
  13. Aug 16 18:33:01 hadoop101.com ntpd[8794]: Listen normally on 5 ...
  14. Aug 16 18:33:01 hadoop101.com ntpd[8794]: Listen normally on 6 ...
  15. Aug 16 18:33:01 hadoop101.com ntpd[8794]: Listening on routing ...
  16. Aug 16 18:33:01 hadoop101.com ntpd[8794]: 0.0.0.0 c016 06 restart
  17. Aug 16 18:33:01 hadoop101.com ntpd[8794]: 0.0.0.0 c012 02 freq_...
  18. Aug 16 18:33:01 hadoop101.com ntpd[8794]: 0.0.0.0 c011 01 freq_...
  19. Aug 16 18:33:01 hadoop101.com systemd[1]: Started Network Time ...
  20. Aug 16 18:33:02 hadoop101.com ntpd[8794]: 0.0.0.0 c514 04 freq_...
  21. Hint: Some lines were ellipsized, use -l to show in full.

复制代码

或

  1. [root@hadoop101 ~]# service ntpd status

9、查看是否同步

  1. [root@hadoop101 ~]# ntpq -p
  2. remote refid st t when poll reach delay offset jitter
  3. ==============================================================================
  4. *LOCAL(0) .LOCL. 5 l 20 64 7 0.000 0.000 0.000

10、设置开机启动

  1. [root@hadoop101 ~]# systemctl enable ntpd
  2. Created symlink from /etc/systemd/system/multi-user.target.wants/ntpd.service to /usr/lib/systemd/system/ntpd.service.

11、设置防火墙，打开udp123端口（如果防火墙关了就不用设置了）

  1. [root@hadoop101 ~]# firewall-cmd --permanent --add-port=123/udp
  2. success
  3. [root@hadoop101 ~]# firewall-cmd --reload
  4. success

12、查看防火墙已打开端口

  1. iptables -L -n

二、客户端配置（其他节点）

前5步与服务器一致

6、修改配置文件，将刚刚搭建好的NTP服务器作为客户端上游时间服务器

复制代码

  1. vim /etc/ntp.conf
  2. #注释掉其他上游时间服务器
  3. #server 0.centos.pool.ntp.org iburst
  4. #server 1.centos.pool.ntp.org iburst
  5. #server 2.centos.pool.ntp.org iburst
  6. #server 3.centos.pool.ntp.org iburst
  7. #配置上游时间服务器为本地的ntpd Server服务器
  8. server hadoop101.com
  9. fudge hadoop101.com stratum 0
  11. #配置允许上游时间服务器主动修改本机的时间
  12. restrict hadoop101.com nomodify notrap noquery

复制代码

配置后：

复制代码

  1. [root@hadoop103 ~]# vi /etc/ntp.conf 
  2. # For more information about this file, see the man pages
  3. # ntp.conf(5), ntp_acc(5), ntp_auth(5), ntp_clock(5), ntp_misc(5), ntp_mon(5).
  5. driftfile /var/lib/ntp/drift
  7. # Permit time synchronization with our time source, but do not
  8. # permit the source to query or modify the service on this system.
  9. #restrict default nomodify notrap nopeer noquery
  11. # Permit all access over the loopback interface.  This could
  12. # be tightened as well, but to do so would effect some of
  13. # the administrative functions.
  14. #restrict 127.0.0.1
  15. #restrict ::1
  17. # Hosts on local network are less restricted.
  18. #restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap
  20. restrict hadoop101.com nomodify notrap noquery
  22. # Use public servers from the pool.ntp.org project.
  23. # Please consider joining the pool (http://www.pool.ntp.org/join.html).
  24. #server 0.centos.pool.ntp.org iburst
  25. #server 1.centos.pool.ntp.org iburst
  26. #server 2.centos.pool.ntp.org iburst
  27. #server 3.centos.pool.ntp.org iburst
  29. server hadoop101.com
  30. fudge hadoop101.com stratum 0
  32. #broadcast 192.168.1.255 autokey        # broadcast server
  33. #broadcastclient                        # broadcast client
  34. #broadcast 224.0.1.1 autokey            # multicast server
  35. #multicastclient 224.0.1.1              # multicast client
  36. #manycastserver 239.255.254.254         # manycast server
  37. #manycastclient 239.255.254.254 autokey # manycast client
  39. # Enable public key cryptography.
  40. #crypto
  42. includefile /etc/ntp/crypto/pw
  44. # Key file containing the keys and key identifiers used when operating
  45. # with symmetric key cryptography.
  46. keys /etc/ntp/keys
  48. # Specify the key identifiers which are trusted.
  49. #trustedkey 4 8 42
  51. # Specify the key identifier to use with the ntpdc utility.
  52. #requestkey 8
  54. # Specify the key identifier to use with the ntpq utility.

复制代码

7、与本地ntpd Server同步一下

  1. [root@hadoop102 ~]# ntpdate -u hadoop101.com
  2. 15 Aug 11:33:35 ntpdate[8768]: adjust time server 192.168.1.101 offset 0.004621 sec

8、启动ntp服务

  1. systemctl start ntpd

或

  1. service ntpd start

9、设置开机启动

  1. [root@hadoop102 ~]# systemctl enable ntpd
  2. Created symlink from /etc/systemd/system/multi-user.target.wants/ntpd.service to /usr/lib/systemd/system/ntpd.service.

10、查看状态

  1. [root@hadoop103 ~]# ntpq -p
  2.      remote           refid      st t when poll reach   delay   offset  jitter
  3. ==============================================================================
  4.  hadoop101.com   .LOCL.           1 u   13   64    1    8.148   -2.581   0.000

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