我阅读了很多有关cron的问答，但是我无法理解我所面临的异常。 我有一个运行3个cronjobs的Raspberry Pi：
* * * * * /home/pi/heartbeatgenerator.sh 2>&1
*/5 * * * * /home/pi/extase2influx/extase2influx.sh 2>&1
*/5 * * * * /home/pi/ows2influx/ows2influx.sh 2>&1
第一个是一个简单的脚本，它通过curl调用每分钟0或1交替写入数据库（InfluxDB）。这样做的目的是检查RPi是否与数据库建立常规连接并正常运行。 看起来像这样：
value=$(($( date +"%M")%2))
curl -i -XPOST "https://[REDACTED].influxcloud.net:8086/write?db=[REDACTED]&u=[REDACTED]&p=[REDACTED]&precision=s" \
--data "heartbeat $HOSTNAME=$value"
第二个脚本是查询一些传感器，并将值发布到同一数据库中。 第三个脚本基本上与第二个脚本相同，但是第一行具有“ sleep 10s”命令（以避免CPU /网络使用率激增）。
现在，一切正常，除了第一个脚本（心跳）在每小时的第08和09分钟每小时定期发生故障。它失败意味着没有数据发布到数据库中。这是数据库转储的一部分：
1/7/2019 1:05:06.000000000 PM,1
1/7/2019 1:06:01.000000000 PM,0
1/7/2019 1:07:01.000000000 PM,1
1/7/2019 1:10:01.000000000 PM,0
1/7/2019 1:11:01.000000000 PM,1
1/7/2019 1:12:02.000000000 PM,0
This is how looks like visually
这是日志文件的一部分：
Jan 7 13:05:01 RPi CRON[6346]: (pi) CMD (/home/pi/ows2influx/ows2influx.sh 2>&1)
Jan 7 13:05:01 RPi CRON[6347]: (pi) CMD (/home/pi/extase2influx/extase2influx.sh 2>&1)
Jan 7 13:05:01 RPi CRON[6348]: (pi) CMD (/home/pi/heartbeatgenerator.sh 2>&1)
Jan 7 13:05:01 RPi CRON[6334]: (CRON) info (No MTA installed, discarding output)
Jan 7 13:05:11 RPi pi: /home/pi/extase2influx/extase2influx.sh INFO: Database entry successfull. Written 1520 bytes
Jan 7 13:05:11 RPi CRON[6333]: (CRON) info (No MTA installed, discarding output)
Jan 7 13:05:12 RPi pi: /home/pi/ows2influx/ows2influx.sh INFO-OWS: Database entry successfull. Written 1456 bytes
Jan 7 13:05:12 RPi CRON[6332]: (CRON) info (No MTA installed, discarding output)
Jan 7 13:05:16 RPi dhcpcd[520]: wlan0: Router Advertisement from fe80::21d:aaff:feb0:8f20
Jan 7 13:05:20 RPi dhcpcd[520]: wlan0: Router Advertisement from fe80::21d:aaff:feb0:8f20
Jan 7 13:05:24 RPi dhcpcd[520]: wlan0: Router Advertisement from fe80::21d:aaff:feb0:8f20
Jan 7 13:06:01 RPi CRON[6566]: (pi) CMD (/home/pi/heartbeatgenerator.sh 2>&1)
Jan 7 13:06:01 RPi CRON[6562]: (CRON) info (No MTA installed, discarding output)
Jan 7 13:07:01 RPi CRON[6579]: (pi) CMD (/home/pi/heartbeatgenerator.sh 2>&1)
Jan 7 13:07:07 RPi CRON[6575]: (CRON) info (No MTA installed, discarding output)
Jan 7 13:07:54 RPi dhcpcd[520]: wlan0: Router Advertisement from fe80::21d:aaff:feb0:8f20
Jan 7 13:07:58 RPi dhcpcd[520]: wlan0: Router Advertisement from fe80::21d:aaff:feb0:8f20
Jan 7 13:08:01 RPi CRON[6608]: (pi) CMD (/home/pi/heartbeatgenerator.sh 2>&1)
Jan 7 13:08:02 RPi CRON[6604]: (CRON) info (No MTA installed, discarding output)
Jan 7 13:08:02 RPi dhcpcd[520]: wlan0: Router Advertisement from fe80::21d:aaff:feb0:8f20
Jan 7 13:09:00 RPi dhcpcd[520]: wlan0: Router Advertisement from fe80::21d:aaff:feb0:8f20
Jan 7 13:09:01 RPi CRON[6636]: (pi) CMD (/home/pi/heartbeatgenerator.sh 2>&1)
Jan 7 13:09:01 RPi CRON[6632]: (CRON) info (No MTA installed, discarding output)
Jan 7 13:09:04 RPi dhcpcd[520]: wlan0: Router Advertisement from fe80::21d:aaff:feb0:8f20
Jan 7 13:09:08 RPi dhcpcd[520]: wlan0: Router Advertisement from fe80::21d:aaff:feb0:8f20
Jan 7 13:10:01 RPi CRON[6672]: (pi) CMD (/home/pi/extase2influx/extase2influx.sh 2>&1)
Jan 7 13:10:01 RPi CRON[6673]: (pi) CMD (/home/pi/heartbeatgenerator.sh 2>&1)
Jan 7 13:10:01 RPi CRON[6674]: (pi) CMD (/home/pi/ows2influx/ows2influx.sh 2>&1)
Jan 7 13:10:06 RPi pi: /home/pi/extase2influx/extase2influx.sh INFO: Database entry successfull. Written 1490 bytes
Jan 7 13:10:06 RPi CRON[6661]: (CRON) info (No MTA installed, discarding output)
Jan 7 13:10:07 RPi CRON[6662]: (CRON) info (No MTA installed, discarding output)
Jan 7 13:10:12 RPi pi: /home/pi/ows2influx/ows2influx.sh INFO-OWS: Database entry successfull. Written 1376 bytes
Jan 7 13:10:12 RPi CRON[6660]: (CRON) info (No MTA installed, discarding output)
Jan 7 13:11:01 RPi CRON[6868]: (pi) CMD (/home/pi/heartbeatgenerator.sh 2>&1)
Jan 7 13:11:07 RPi CRON[6864]: (CRON) info (No MTA installed, discarding output)
我没有看到任何奇怪的东西，也没有看到任何原因导致cronjob heartbeat.sh在每小时的第08和09分钟出现故障。
你们中有些人有线索吗？