[System logs]: Dynamically calculate file rotation thresholds based on /var/log/ partition size#851

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jleveque wants to merge 11 commits intosonic-net:masterfrom jleveque:improve_syslog

+137-65

Commits on Jul 31, 2017

Properly prevent cron from logging to /var/log/syslog
jleveque
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Condense logs further to eliminate duplicate logs and further prevent filling disk space
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Comment
jleveque
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Allow other users to read log files mamged by rsyslog
jleveque
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Force log rotation at size intervals; remove temporal rotations altoghether since logrotate is run every minute
jleveque
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Add 'Managed by SONiC Config Engine' banner to rsyslog.conf.j2
jleveque
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Dynamically calculate logrotate file size thresholds based on /var/log/
jleveque
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Change logrotate cron job to use /etc/logrotate.conf, which includes all files in /etc/logrotate.d/
jleveque
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Rename sonic.j2 back to rsyslog(.j2), as /etc/logrotate.d/rsyslog in order to
jleveque
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Add comment re: percentages must sum to 100
jleveque
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Reorder operations to reduce truncation and make more understandable
jleveque
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