systemctl status crond
nixos 居然没有，但是 fedora 使用的还是这个服务。
./crontab.c 1261
./entry.c 751
./security.c 748
./cron.c 742
./misc.c 722
./do_command.c 684
./database.c 682
./cronnext.c 435
./env.c 306
./popen.c 221
./user.c 179
./pw_dup.c 128
./job.c 107
https://github.com/cronie-crond/cronie
这个不错
https://ittavern.com/cron-jobs-on-linux-comprehensive-guide/
看看
crond(1469)─┬─crond(4484)───bash(4489)───sleep(4491)
├─crond(4565)───bash(4570)───sleep(4572)
├─crond(4575)───bash(4580)───sleep(4582)
├─crond(4585)───bash(4590)───sleep(4592)
├─crond(4595)───bash(4600)───sleep(4602)
├─crond(4605)───bash(4610)───sleep(4612)
├─crond(5217)───bash(5222)───sleep(5224)
├─crond(5560)───bash(5565)───sleep(5567)
├─crond(5571)───bash(5582)───sleep(5584)
├─crond(5588)───bash(5594)───sleep(5596)
├─crond(5612)───bash(5617)───sleep(5619)
├─crond(5888)───bash(5893)───sleep(5895)
└─crond(5898)───bash(5903)───sleep(5905)
F S UID PID PPID C PRI NI ADDR SZ WCHAN STIME TTY TIME CMD
5 S root 4484 1469 0 80 0 - 7874 - 11:52 ? 00:00:00 /usr/sbin/CROND -n
4 S root 4489 4484 0 80 0 - 5650 - 11:52 ? 00:00:00 bash /home/martins3/test.sh
0 S root 4491 4489 0 80 0 - 5281 - 11:52 ? 00:00:00 sleep 1000000
5 S root 4565 1469 0 80 0 - 7874 - 11:53 ? 00:00:00 /usr/sbin/CROND -n
4 S root 4570 4565 0 80 0 - 5650 - 11:53 ? 00:00:00 bash /home/martins3/test.sh
0 S root 4572 4570 0 80 0 - 5281 - 11:53 ? 00:00:00 sleep 1000000
5 S root 4575 1469 0 80 0 - 7874 - 11:54 ? 00:00:00 /usr/sbin/CROND -n
4 S root 4580 4575 0 80 0 - 5650 - 11:54 ? 00:00:00 bash /home/martins3/test.sh
0 S root 4582 4580 0 80 0 - 5281 - 11:54 ? 00:00:00 sleep 1000000
5 S root 4585 1469 0 80 0 - 7874 - 11:55 ? 00:00:00 /usr/sbin/CROND -n
4 S root 4590 4585 0 80 0 - 5650 - 11:55 ? 00:00:00 bash /home/martins3/test.sh
0 S root 4592 4590 0 80 0 - 5281 - 11:55 ? 00:00:00 sleep 1000000
5 S root 4595 1469 0 80 0 - 7874 - 11:56 ? 00:00:00 /usr/sbin/CROND -n
4 S root 4600 4595 0 80 0 - 5650 - 11:56 ? 00:00:00 bash /home/martins3/test.sh
0 S root 4602 4600 0 80 0 - 5281 - 11:56 ? 00:00:00 sleep 1000000
5 S root 4605 1469 0 80 0 - 7874 - 11:57 ? 00:00:00 /usr/sbin/CROND -n
4 S root 4610 4605 0 80 0 - 5650 - 11:57 ? 00:00:00 bash /home/martins3/test.sh
0 S root 4612 4610 0 80 0 - 5281 - 11:57 ? 00:00:00 sleep 1000000
1 I root 5196 2 0 80 0 - 0 - 11:57 ? 00:00:00 [kworker/0:0-cgroup_destroy]
5 S root 5217 1469 0 80 0 - 7874 - 11:58 ? 00:00:00 /usr/sbin/CROND -n
4 S root 5222 5217 0 80 0 - 5650 - 11:58 ? 00:00:00 bash /home/martins3/test.sh
0 S root 5224 5222 0 80 0 - 5281 - 11:58 ? 00:00:00 sleep 1000000
5 S root 5560 1469 0 80 0 - 7874 - 11:59 ? 00:00:00 /usr/sbin/CROND -n
4 S root 5565 5560 0 80 0 - 5650 - 11:59 ? 00:00:00 bash /home/martins3/test.sh
0 S root 5567 5565 0 80 0 - 5281 - 11:59 ? 00:00:00 sleep 1000000
5 S root 5571 1469 0 80 0 - 7874 - 12:00 ? 00:00:00 /usr/sbin/CROND -n
4 S root 5582 5571 0 80 0 - 5650 - 12:00 ? 00:00:00 bash /home/martins3/test.sh
0 S root 5584 5582 0 80 0 - 5281 - 12:00 ? 00:00:00 sleep 1000000
5 S root 5588 1469 0 80 0 - 7874 - 12:01 ? 00:00:00 /usr/sbin/CROND -n
4 S root 5594 5588 0 80 0 - 5650 - 12:01 ? 00:00:00 bash /home/martins3/test.sh
0 S root 5596 5594 0 80 0 - 5281 - 12:01 ? 00:00:00 sleep 1000000
1 S root 5607 1 0 80 0 - 5567 - 12:01 ? 00:00:00 /usr/sbin/anacron -s
5 S root 5612 1469 0 80 0 - 7874 - 12:02 ? 00:00:00 /usr/sbin/CROND -n
4 S root 5617 5612 0 80 0 - 5650 - 12:02 ? 00:00:00 bash /home/martins3/test.sh
0 S root 5619 5617 0 80 0 - 5281 - 12:02 ? 00:00:00 sleep 1000000
1 I root 5886 2 0 80 0 - 0 - 12:02 ? 00:00:00 [kworker/u4:0-events_unbound]
5 S root 5888 1469 0 80 0 - 7874 - 12:03 ? 00:00:00 /usr/sbin/CROND -n
4 S root 5893 5888 0 80 0 - 5650 - 12:03 ? 00:00:00 bash /home/martins3/test.sh
0 S root 5895 5893 0 80 0 - 5281 - 12:03 ? 00:00:00 sleep 1000000
5 S root 5898 1469 0 80 0 - 7874 - 12:04 ? 00:00:00 /usr/sbin/CROND -n
4 S root 5903 5898 0 80 0 - 5650 - 12:04 ? 00:00:00 bash /home/martins3/test.sh
0 S root 5905 5903 0 80 0 - 5281 - 12:04 ? 00:00:00 sleep 1000000
4 S root 5906 1435 0 80 0 - 4494 - 12:04 ? 00:00:00 sshd: martins3 [priv]
5 S martins3 5916 5906 0 80 0 - 4534 - 12:04 ? 00:00:00 sshd: martins3@pts/0
0 S martins3 5921 5916 0 80 0 - 6603 wait_w 12:04 pts/0 00:00:00 -zsh
1 I root 6150 2 0 80 0 - 0 - 12:04 ? 00:00:00 [kworker/u4:1]
1 I root 6152 2 0 80 0 - 0 - 12:04 ? 00:00:00 [kworker/0:1-cgroup_destroy]
5 S root 6169 1469 0 80 0 - 7874 - 12:05 ? 00:00:00 /usr/sbin/CROND -n
4 S root 6174 6169 0 80 0 - 5650 - 12:05 ? 00:00:00 bash /home/martins3/test.sh
0 S root 6176 6174 0 80 0 - 5281 - 12:05 ? 00:00:00 sleep 1000000
为什么这样的
发现这些都是没有 child
crash> ps -c 5571
PID: 5571 TASK: ffff99d40fb8df00 CPU: 9 COMMAND: "crond"
(no children)
作为对比
crash> ps 2888 -c
PID: 2888 TASK: ffff945a49c64740 CPU: 0 COMMAND: "crond"
PID: 2889 TASK: ffff945a4ded2f80 CPU: 0 COMMAND: "test.sh"
执行的方法
crontab -e
* * * * * /root/test.sh
chmod +x /root/test.sh
echo "Task executed at $(date)" >> /tmp/log.txt
sleep 1000000
内部环境中:
crash> ps -a automount 3273
PID: 3273 TASK: ffff945a48bedf00 CPU: 0 COMMAND: "crond"
ARG: /usr/sbin/CROND -n
ENV: LANG=en_US.UTF-8
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin
CRONDARGS=
应该还可以获取到 stack 才对的
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