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free tools / cron generator

Cron every 2 minutes

Here is the line. Cron will run it, but it will not tell you the day it stops.

  1. Add one ping to the end of the job.
  2. Tell Uptimepage how often to expect it.
  3. A missed ping opens an incident and alerts you by Slack, email, PagerDuty, SMS or webhook.
alert me if this job stops

Free plan, no card. Opens the new-monitor form as a heartbeat check.

crontab -e
# .------------- minute: 0, 2, 4, …, 58 # | .--------- hour: any value # | | .------- day of month: any value # | | | .----- month: any value # | | | | .--- day of week: any value */2 * * * * /path/to/command # Every 2 minutes. That is 720 runs a day.

# next runs · your local time

    # the same job, reporting in after each good run */2 * * * * /path/to/command && curl -fsS $URL # $URL is the ping URL of an Uptimepage heartbeat check

    Add the line with crontab -e. Cron reads the server's time zone, which is often UTC.

    same schedule elsewhere

    Kubernetes CronJob

    spec:
  schedule: "*/2 * * * *"

    GitHub Actions runs no schedule more often than every 5 minutes, so this one needs another scheduler.

    what to know

    The step */2 matches the even minutes: 0, 2, 4 and on to 58. For the odd minutes, write 1-59/2 * * * *.

    Cron starts each run on time whether or not the last one finished. If the job can outlast the interval, guard it with a lock such as flock -n /tmp/job.lock /path/to/command, so runs do not pile up.

    For anything else, build it in the cron expression generator.

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