Query for AAAA and A records<\/strong><\/em><\/p>\nOnce you know which servers you want to use, it is moment to know their public IP address. It is preferably that they have IPv6 connectivity.<\/p>\n
You may use the linux command dig:<\/p>\n
<\/p>\n
dig 1a.ncomputers.org ANY<\/pre>\n <\/p>\n
;; ANSWER SECTION:\r\n1a.ncomputers.org. 26652 IN AAAA 2a02:c207:2010:9464::1\r\n1a.ncomputers.org. 26652 IN A 173.212.196.208<\/pre>\nOr this online app toolbox.googleapps.com\/apps\/dig<\/p>\n
<\/p>\n
;ANSWER\r\n1a.ncomputers.org. 86399 IN AAAA 2a02:c207:2010:9464::1\r\n1a.ncomputers.org. 86399 IN A 173.212.196.208<\/pre>\n <\/p>\n
Edit \/etc\/ntpd.conf file<\/strong><\/em><\/p>\nOnce you know the IPv6 and IPv4 addresses of the servers you chose, then copy and paste the below content to \/etc\/ntpd.conf replacing the bolded addresses accordingly.<\/p>\n
<\/p>\n
driftfile \/var\/lib\/ntp\/ntp.drift\r\nrestrict default kod nomodify nopeer noquery notrap\r\nrestrict localhost\r\nserver 2001:4ca0:0:103::81bb:fe20\r\nserver 2001:638:a000:1123:123::1\r\nserver 2001:62a:4:311::123<\/pre>\nRestart the Network Time Protocol daemon<\/strong><\/em><\/p>\nOnce ntpd was configured, it is moment to load the new configuration file.<\/p>\n
init.d based init system (e.g: upstart, sysvinit)<\/strong><\/p>\n <\/p>\n
service ntp restart<\/pre>\n <\/p>\n
systemd as init system<\/strong><\/p>\n <\/p>\n
systemctl restart ntp<\/pre>\n <\/p>\n
Test your server<\/strong><\/em><\/p>\nYou have to wait around five minutes until ntpd stabilizes the time sources and make sure port UDP 123 is open: NTP server test.<\/p>\n
<\/span>Add web service redirect (optional)<\/span><\/h3>\nIn case your new NTP server is running web services as well, you may want to redirect web queries to the correct site. For example in apache you should add this virtual host:<\/p>\n
Using mod_alias<\/strong><\/p>\n <\/p>\n
<VirtualHost *:80>\r\nServerName pool.ntp.org\r\nServerAlias *.pool.ntp.org *.ntppool.org\r\nRedirect permanent \/ http:\/\/www.pool.ntp.org\/\r\n<\/VirtualHost><\/pre>\nUsing mod_rewrite<\/strong><\/p>\n <\/p>\n
<VirtualHost *:80>\r\nServerName pool.ntp.org\r\nServerAlias *.pool.ntp.org *.ntppool.org\r\nRewriteRule ^ http:\/\/www.pool.ntp.org%{REQUEST_URI} [R=301,L]\r\n<\/VirtualHost><\/pre>\n<\/span>\nJoin the NTP pool project<\/span><\/h3>\nFinally, in order to join your servers to the NTP pool project, just follow these steps:<\/p>\n
>Go to manage.ntppool.org\/manage
\n>Sign up (in case you do not have an account).
\n>Log in.
\n>Write the hostname of your new NTP server or one of its IPv4 \/ IPv6 static addresses.
\n>Click on the submit button.<\/p><\/blockquote>\n
Hopefully you can provide at least one IPv4 static address and one IPv6 static address for each server.<\/p>\n
Sometimes you have to wait few minutes until ntpd stabilizes the real time clock.<\/p>\n
In case it asks for the physical location of your NTP server you only have to provide the country where it is located.<\/p>\n
Once it appears in Your Servers list, you might want to handle the amount of traffic it serves, defining their net speed.<\/p>\n
For OpenVZ virtual servers it is recommended, that you choose around 10MBit, since the server might be shutdown, because each OpenVZ instance usually supports a low amount of simultaneously network connections.<\/p>\n
For physical and KVM servers you may select the highest available connection speed, even if your connection speed is lower than it.<\/p>\n
As a reference data: the amount of traffic served by our NTP servers with a chosen net speed of 1000MBit is around 40 Kb\/s downstream and 40 Kb\/s upstream.<\/p>\n","protected":false},"excerpt":{"rendered":"
There are many factors, that increase the time deviation of any real clock. Listing the most relevant: acceleration and gravity<\/p>\n","protected":false},"author":1,"featured_media":350,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_container_layout":"default_layout","colormag_page_sidebar_layout":"default_layout","footnotes":""},"categories":[4],"tags":[11,12,13,14],"class_list":["post-349","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-vps","tag-linux","tag-ntp","tag-os","tag-time-servers"],"_links":{"self":[{"href":"https:\/\/linuxresellerwebhosting.in\/blog\/wp-json\/wp\/v2\/posts\/349","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/linuxresellerwebhosting.in\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/linuxresellerwebhosting.in\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/linuxresellerwebhosting.in\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/linuxresellerwebhosting.in\/blog\/wp-json\/wp\/v2\/comments?post=349"}],"version-history":[{"count":1,"href":"https:\/\/linuxresellerwebhosting.in\/blog\/wp-json\/wp\/v2\/posts\/349\/revisions"}],"predecessor-version":[{"id":351,"href":"https:\/\/linuxresellerwebhosting.in\/blog\/wp-json\/wp\/v2\/posts\/349\/revisions\/351"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/linuxresellerwebhosting.in\/blog\/wp-json\/wp\/v2\/media\/350"}],"wp:attachment":[{"href":"https:\/\/linuxresellerwebhosting.in\/blog\/wp-json\/wp\/v2\/media?parent=349"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/linuxresellerwebhosting.in\/blog\/wp-json\/wp\/v2\/categories?post=349"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/linuxresellerwebhosting.in\/blog\/wp-json\/wp\/v2\/tags?post=349"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}