logrotate failing to rotate, permission denied as root user

Question

I'm having a problem that I cannot wrap my head around. I've setup logrotate on a centos 7 server to rotate my app logs.

This file is in /etc/cron.daily (i even added a whoami to verify it's running as root):

#!/bin/sh

whoami

/usr/sbin/logrotate -v /etc/logrotate.d/myapp
EXITVALUE=$?
if [ $EXITVALUE != 0 ]; then
/usr/bin/logger -t logrotate "ALERT exited abnormally with [$EXITVALUE]"
fi
exit 0

This executes my logrotate config ...

"/opt/myapp/log/*.log" {
  daily
  create 644 root root
  rotate 5
  size 20M
  copytruncate
  missingok
  notifempty
  compress
}

Here is my log directory...

[root@server log]# ls -la
total 97684
drwxr-xr-x. 3 root root      4096 Sep 28 12:41 .
drwxr-xr-x. 5 root root      4096 Sep 27 20:57 ..
-rw-r--r--. 1 root root 100015457 Sep 28 12:36 myapp.log

Every time we run it manually as root, it rotates the log... but when we run it through cron, it fails. Here is the mail it sends...

From root@server  Thu Sep 28 12:30:02 2017
Return-Path: <root@server>
X-Original-To: root
Delivered-To: root@server
Received: by server (Postfix, from userid 0)
        id 9C82B419; Thu, 28 Sep 2017 12:30:02 -0500 (CDT)
From: "(Cron Daemon)" <root@server>
To: root@server
Subject: Cron <root@server> run-parts /etc/cron.daily
Content-Type: text/plain; charset=UTF-8
Auto-Submitted: auto-generated
Precedence: bulk
X-Cron-Env: <XDG_SESSION_ID=10746>
X-Cron-Env: <XDG_RUNTIME_DIR=/run/user/0>
X-Cron-Env: <LANG=en_US.UTF-8>
X-Cron-Env: <SHELL=/bin/bash>
X-Cron-Env: <PATH=/sbin:/bin:/usr/sbin:/usr/bin>
X-Cron-Env: <MAILTO=root>
X-Cron-Env: <HOME=/root>
X-Cron-Env: <LOGNAME=root>
X-Cron-Env: <USER=root>
Message-Id: <20170928173002.9C82B419@server>
Date: Thu, 28 Sep 2017 12:30:01 -0500 (CDT)
/etc/cron.daily/myapp:

root <<<<<<<<< whoami output
reading config file /etc/logrotate.d/myapp
Handling 1 logs
rotating pattern: /opt/myapp/log/*.log  20971520 bytes (5 rotations)
empty log files are not rotated, old logs are removed
considering log /opt/myapp/log/myapp.log
  log needs rotating
rotating log /opt/myapp/log/myapp.log, log->rotateCount is 5
error: error opening /opt/myapp/log/myapp.log: Permission denied
set default create context

Anyone ever encounter this or have any ideas what could be causing this?

Solution

Turns out this was an SELinux issue, the file context was not one that logrotate had access to, so was repeatedly getting denied access.

See here for this answer: SELinux fcontext