Ifayela le-crontab yifayela lombhalo elilula eliqukethe uhlu lwemiyalo ehloselwe ukusebenza ngezikhathi ezithile. … Imiyalo kufayela le-crontab (kanye nezikhathi zokusebenza kwayo) ihlolwa yi-cron daemon, eyisebenzisa ngemuva kwesistimu. Umsebenzisi ngamunye (okuhlanganisa impande) unefayela le-crontab.
Iyini ukusetshenziswa kwe-crontab?
I-crontab iwuhlu lwemiyalo ofuna ukuyisebenzisa ngohlelo olujwayelekile, kanye negama lomyalo osetshenziswa ukuphatha lolo hlu. I-Crontab imele "itafula le-cron," ngoba isebenzisa i- isihleli somsebenzi cron ukwenza imisebenzi; I-cron ngokwayo iqanjwe ngegama elithi “chronos,” igama lesiGreki elisho isikhathi.
Isebenza kanjani i-crontab ku-Ubuntu?
Izinyathelo ezilandelayo okufanele zilandelwe ukusetha umsebenzi we-cron ku-Ubuntu:
- Xhuma kuseva futhi ubuyekeze uhlelo: ...
- Bheka ukuthi iphakheji ye-cron ifakiwe: ...
- Uma i-cron ingafakiwe, faka iphakheji ye-cron ku-Ubuntu: ...
- Qinisekisa ukuthi isevisi ye-cron isebenza: ...
- Lungiselela umsebenzi we-cron ku-ubuntu:
Kungani i-crontab ingalungile?
Inkinga ukuthi bebesebenzisa ithuluzi elingalungile. I-Cron ilungele imisebenzi elula engavamile ukusebenza. … Ezinye izimpawu eziyisixwayiso zokuthi umsebenzi we-cron uzozikhukhumeza ngokwawo: Uma unokuthile okuncike kweminye imishini, kungenzeka ukuthi omunye wayo uzokwehla noma wehle futhi umsebenzi uzothatha isikhathi eside ngokungalindelekile ukuthi usebenze.
Liyini ifayela le-crontab futhi lisetshenziselwa ini?
amafayela we-crontab (ithebula le-cron) itshela u-cron ukuthi kufanele agijime nini nokuthi ayisebenzise nini futhi igcinelwe abasebenzisi ku-/var/spool/cron, negama le-crontab elihambisana negama lomsebenzisi. Amafayela abalawuli agcinwa ku-/etc/crontab, futhi kukhona i-/etc/cron. d izinhlelo ezingasebenzisa ukugcina amafayela azo weshejuli.
Ngilubona kanjani uhlu lwe-crontab?
Ukuze uqinisekise ukuthi ifayela le-crontab likhona lomsebenzisi, sebenzisa ifayela le- ls -l umyalo kumkhombandlela /var/spool/cron/crontabs. Isibonelo, isibonisi esilandelayo sibonisa ukuthi amafayela e-crontab akhona kubasebenzisi smith and jones. Qinisekisa okuqukethwe kwefayela le-crontab lomsebenzisi ngokusebenzisa i-crontab -l njengoba kuchazwe kokuthi “Indlela Yokubonisa Ifayela Le-crontab”.
Ngazi kanjani ukuthi i-crontab iyasebenza?
Ukuze uqinisekise ukuthi lo msebenzi wenziwe ngempumelelo noma cha, hlola ifayela /var/log/cron, equkethe ulwazi mayelana nayo yonke imisebenzi ye-cron eyenziwa ohlelweni lwakho. Njengoba ubona kokuphumayo okulandelayo, umsebenzi ka-john cron usetshenziswe ngempumelelo.
Ngingaqala kanjani i-cron daemon?
Imiyalo yomsebenzisi we-RHEL/Fedora/CentOS/Scientific Linux
- Qala isevisi ye-cron. Ukuqala insiza ye-cron, sebenzisa: /etc/init.d/crond start. …
- Misa isevisi ye-cron. Ukumisa isevisi ye-cron, sebenzisa: /etc/init.d/crond stop. …
- Qala kabusha isevisi ye-cron. Ukuze uqale kabusha isevisi ye-cron, sebenzisa: /etc/init.d/crond restart.
Ngiyisebenzisa kanjani i-crontab?
Ungayakha noma uhlele kanjani ifayela le-crontab
- Dala ifayela elisha le-crontab, noma hlela ifayela elikhona kakade. # crontab -e [ igama lomsebenzisi ] ...
- Engeza imigqa yomyalo kufayela le-crontab. Landela i-syntax echazwe ku-Syntax ye-crontab File Entries. …
- Qinisekisa izinguquko zefayela lakho le-crontab. # crontab -l [ igama lomsebenzisi ]
Ngazi kanjani uma umsebenzi we-cron uphumelela ku-Ubuntu?
4 Izimpendulo. Uma ufuna ukwazi ukuthi iyasebenza ungenza into efana nale Isimo se-sudo systemctl cron noma i-ps aux | grep cron .
Ingabe i-crontab iyabiza?
2 Izimpendulo. Ingabe imisebenzi ye-cron izinqubo ezinzima futhi ezibizayo ezidla izinsiza eziningi? Hhayi ngaphandle kokuthi wenze banjalo. Inqubo ye-cron ngokwayo ilula kakhulu.
Ingabe ukwenza umsebenzi we-cron yonke iminithi kubi?
"Cron" izosebenzisa eyakho umsebenzi njalo ngomzuzu o-1 (ubuningi). Lokhu kuthwala ingxenye enkulu yokuqala inqubo entsha, ukulayisha amafayela edatha njll. Nokho, ukuqala inqubo entsha kuzogwema ukuvuza kwenkumbulo (ngoba uma inqubo endala iphuma, ikhipha noma yiziphi izinsiza eziputshuziwe). Ngakho-ke kukhona ukuhwebelana kokusebenza / ukuqina.
Ingabe umsebenzi we-cron uphephile?
2 Izimpendulo. Empeleni ivikelekile, kodwa futhi kungenye indlela yokuthi umhlaseli, uma esefake isistimu engozini, enze umnyango wangemuva uphikelele futhi/noma awuvule ngokuzenzakalelayo noma nini uma uyivala. Ungasebenzisa amafayela /etc/cron.