Print this page

News

2017-09-14 11:59:33

CentOS 7.4 released: Potential Sendmail issues


CentOS 7.4 has been released an updates for it have it the YUM repositories. On BlueOnyx 5209R this *may* cause a Sendmail outage.

Category: General
Posted by: mstauber

After the CentOS 7.4 updates hit the CentOS YUM repositories, we noticed that several (but not all) of our own BlueOnyx 5209R instances experienced Sendmail issues. Sendmail was dead and refused to restart. The "systemctl restart sendmail" command was hanging a long time before it failed.

However, on other 5209R's the update either went through without issue and Sendmail could be restarted just fine.

We quickly discovered that the affected boxes had lost the symlink from /var/run -> /run and that this was responsible for the Sendmail restart problem.

If you're affected by this problem, then please do this:

One work around that works is this:

Edit /lib/systemd/system/sendmail.service and find this line:

PIDFile=/var/run/sendmail.pid

Change it to this:

PIDFile=/run/sendmail.pid

Then run this two commands:

systemctl daemon-reload
systemctl restart sendmail

The first notifies Systemd about the changed Sendmail unit-file and the second one then successfully restart Sendmail.

We're still looking at the broader issue of the /var/run symlink and why that went away and what other issues (if any) it may have for us.


Previous page: API Documentation
Next page: Downloads