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pvc-ansible/roles/base/templates/etc/ntp.conf.j2

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Initial commit of PVC Ansible role
2023-09-01 15:42:19 -04:00
# Main NTP configuration
# {{ ansible_managed }}
driftfile /var/lib/ntp/ntp.drift
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
disable auth
Get NTP from real servers
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Allow inter-cluster orphan NTP sync Due to the requirement of Ceph to have all peer nodes tightly synchronized with each other to come online, PVC nodes need a way to synchronize to each other even in the absence of an external time reference. This is especially prevalent if a set of nodes are left offline for an extended period (>1-2 weeks), since their hardware clocks will drift. If the resulting Internet connectivity is then dependent on a VM, this will cause a catch-22 and the cluster will not properly start. This configuration will accomplish that - if no suitable >6 stratum peers are found, the hosts will enter orphan mode. Since they are now all configured as "peers" with each other, they will collectively decide on one of them to become the source and sync to it. A local stratum 10 fudge is added so that at least one of the nodes can become this source. While this is not an ideal use of NTP, it is by far the cleanest solution to this problem, and does not impact normal functionality when the two configured stratum-2 servers are reachable.
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# Enable orphan mode if cluster cannot connect to the Internet
tos orphan 6
server 127.0.0.1
fudge 127.0.0.1 stratum 10
Add customizable NTP servers
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# NTP masters
{% for server in ntp_servers %}
server {{ server }} iburst
{% endfor %}
Get NTP from real servers
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# Local PVC cluster
Use cluster_group variable for paths Instead of trying to automagic this group out of the Ansible hostvars, just make it explicitly defined in the group_vars to avoid any confusion.
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{% for host in groups[cluster_group] %}
Allow inter-cluster orphan NTP sync Due to the requirement of Ceph to have all peer nodes tightly synchronized with each other to come online, PVC nodes need a way to synchronize to each other even in the absence of an external time reference. This is especially prevalent if a set of nodes are left offline for an extended period (>1-2 weeks), since their hardware clocks will drift. If the resulting Internet connectivity is then dependent on a VM, this will cause a catch-22 and the cluster will not properly start. This configuration will accomplish that - if no suitable >6 stratum peers are found, the hosts will enter orphan mode. Since they are now all configured as "peers" with each other, they will collectively decide on one of them to become the source and sync to it. A local stratum 10 fudge is added so that at least one of the nodes can become this source. While this is not an ideal use of NTP, it is by far the cleanest solution to this problem, and does not impact normal functionality when the two configured stratum-2 servers are reachable.
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peer {{ host }}
Get NTP from real servers
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{% endfor %}
# Provide NTP for others via multicast
multicast 224.0.0.3
multicast ff05::103
Initial commit of PVC Ansible role
2023-09-01 15:42:19 -04:00
restrict -4 default notrap nomodify
restrict -6 default notrap nomodify
restrict 127.0.0.1
restrict ::1