5
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There's nothing to fix. This is normal operation. When the logfile is rotated by
logrotate, it tells rsyslog to close and re-open its logfile file handles by sending it a HUP signal.
If rsyslog doesn't do that, then it will continue to write its log output to the OLD logfiles, not to the new ones because the file handles will still connect to the old files.
This is true even if the old files are deleted (because, on unix, a file isn't truly deleted until the last file handle holding it open is closed)....which is why files don't always release the space they are using up back to the filesystem immediately if some process has an open file handle to them.
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15
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It's not an error, it just tells you that the partition
/dev/sda1 has been remounted with the mount option errors=remount-ro. It's nothing you need to worry about. It may happen e.g. during a normal system startup if /dev/sda1 is your root partition.
The mount option means that the system should mount the partition read-only if an error occurs to minimize further damage or data loss and is used by default.
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