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I have seen many howtos recommending to add a monthly cronjob for the certificate renewal on the first day of the month at 12am (0 0 1 * * or @monthly). It is probably better to renew the certificate on a random day/time (30 4 5 * *) to prevent excessive load on their servers.



A RANDOM_DELAY is actually built into @monthly, at least on RHEL/CentOS 6+.




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