[chrony-users] Delaying postfix until chronyd gets the time

[Robert Moskowitz <rgm@xxxxxxxxxxxxxxx>]

This is on Centos7 on arm:

In my continuing journey to run a armv7 server with no battery clock, I 
have been strongly advised on the postfix list that it should NOT start 
until the system time is after the create time of the running version of 
postfix.

/usr/lib/systemd/system/postfix.service has:


[Unit]
Description=Postfix Mail Transport Agent
After=syslog.target network.target
Conflicts=sendmail.service exim.service

[Service]
Type=forking
PIDFile=/var/spool/postfix/pid/master.pid
EnvironmentFile=-/etc/sysconfig/network
ExecStartPre=-/usr/libexec/postfix/aliasesdb
ExecStartPre=-/usr/libexec/postfix/chroot-update
ExecStart=/usr/sbin/postfix start
ExecReload=/usr/sbin/postfix reload
ExecStop=/usr/sbin/postfix stop

[Install]
WantedBy=multi-user.target

Adding chronyd.service to the After statement would only delay postfix 
until chronyd started, not until it set the time (and what if the 
network was down at startup time?).

How might I add a ExecStartPre clause that would delay postfix until the 
system time was right?

thanks



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