On 04/22/2017 07:43 PM, Jim Perrin wrote:
On 04/21/2017 06:03 AM, Robert Moskowitz wrote:
Fellow armv7-without-rtc-battery users. Maybe you have already learned this, but I THINK I have completed my education on this thanks to Miroslav Lichvar on the Chrony list.
There are two issues here: It takes time for chronyd to set the system time. And if it fails to reach the ntp servers, well, it failed to set the time.
For the first, we need to delay some services from starting until chronyd is successful. Postfix is one of them. So we need the following commands:
systemctl enable chrony-wait systemctl start chrony-wait sed -i '/^After=/ s/$/ time-sync.target/w /dev/stdout' /usr/lib/systemd/system/postfix.service
You're not going to want to do this here. Because systemd has a concept of overrides, administrator modifications should go in /etc/systemd/system, rather than directly modifying /usr/lib/systemd/* files. This will keep your changes across updates.
I did not like changing postfix.service, but I have not found how to modify the After= instructions through /etc/systemd/system.
Can you point me to instructions? I looked at
/etc/systemd/system/multi-user.target.wants/postfix.service
And the change I made to /usr/lib/systemd/system/postfix.service carried over, and the timestamp in /etc/systemd did not change. Strange.
thanks
There are some possible instances where you also want to do this to httpd.service, but I have been advised on the postfix list NOT to run postfix if the systemtime is earlier than the postfix build date
$ postconf -dh mail_release_date 20130622
Plus the postfix.service runs aliases.db which will mess up your aliases.db timestamp.
Next there is that pesky issue about what if no ntp servers reached?
First:
cat <<EOF>/etc/sysconfig/chronyd || exit 1 OPTIONS=" -s" EOF
Since Centos7 has Chronyd 2.1.1, not 2.2, we have extra work to do in chronyd.conf:
cat <<EOF>>/etc/chrony.conf || exit 1 rtcdevice /dev/doesnotexist EOF
I am adding this to my basic server howto page.
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