I came across an ntp.conf file that specifies pool directives:
# Use servers from the NTP Pool Project. Approved by Ubuntu Technical Board
# on 2011-02-08 (LP: #104525). See http://www.pool.ntp.org/join.html for
# more information.
pool 0.ubuntu.pool.ntp.org
pool 1.ubuntu.pool.ntp.org
pool 2.ubuntu.pool.ntp.org
pool 3.ubuntu.pool.ntp.org
Yet it also has server directives in the same file, which I am more familiar with.
Reading about pool, I see it is meant to be used instead of server. You should use one or the other.
However, what happens if ntp.conf has both? Does one set take precedence over the other, or will all be used?
This is on Ubuntu 14.04, ntpd is version 4.2.6p5.