Running Cron every 2 hours

Solution 1:

An asterisk in the minute (first) field tells it to run every minute, regardless of the other fields.

You need to specify an exact minute to run within the hour. Be that on the hour (0), half past (30), etc..

0 */2 * * * /path-to-script

Solution 2:

The correct description of what you had

 * */2 * * * /path-to-script

is "run every minute where the hour is a multiple of 2".

Which means 00:00 to 00:59, 02:00 to 02:59, 04:00 to 04:59, ... and so on. Not quite the same as "run every minute". The solution already given is valid though.

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Solution 3:

Off the top of my head, you could try specifying all the hours when it should run:

0 0,2,4,6,8,10,12,14,16,18,20,22 * * * /path-to-script