I-Cron daemon iyinsiza eyakhelwe ngaphakathi ye-Linux esebenzisa izinqubo kusistimu yakho ngesikhathi esihleliwe. I-Cron ifunda i-crontab (amathebula e-cron) yemiyalo echazwe ngaphambilini nemibhalo. Ngokusebenzisa i-syntax ethile, ungamisa umsebenzi we-cron ukuhlela imibhalo noma eminye imiyalo ukuthi isebenze ngokuzenzakalelayo.
Iyini ukusetshenziswa kwe-crontab ku-Linux?
I-Crontab imele "itafula le-cron". Ivumela ukusebenzisa umhleli wemisebenzi, owaziwa ngokuthi i-cron ukwenza imisebenzi. I-Crontab futhi igama lohlelo, elisetshenziselwa ukuhlela lolo hlelo. Iqhutshwa ifayela le-crontab, ifayela lokumisa elibonisa imiyalo yegobolondo ukuthi isebenze ngezikhathi ezithile ngohlelo oluthile.
Kungani sisebenzisa umsebenzi we-cron?
Imisebenzi ye-Cron isetshenziselwa ukuhlela imisebenzi ezosebenza kuseva. Ngokuvamile zisetshenziselwa ukulungisa noma ukuphatha isistimu ngokuzenzakalelayo. Kodwa-ke, zibalulekile nasekuthuthukisweni kohlelo lokusebenza lwewebhu. Kunezimo eziningi lapho uhlelo lwewebhu lungase ludinge imisebenzi ethile ukuze lusebenze ngezikhathi ezithile.
Kuyini ukusetshenziswa komyalo we-crontab ku-Unix?
I-crontab iwuhlu lwemiyalo ofuna ukuyisebenzisa ngohlelo olujwayelekile, kanye negama lomyalo osetshenziswa ukuphatha lolo hlu. I-Crontab imele “itafula le-cron,” ngoba isebenzisa isihleli somsebenzi i-cron ukwenza imisebenzi; I-cron ngokwayo iqanjwe ngegama elithi “chronos,” igama lesiGreki elisho isikhathi.
Uyini umehluko phakathi kwe-cron ne-crontab?
I-cron igama lethuluzi, i-crontab ngokuvamile iyifayela elibhala imisebenzi ezokwenziwa yi-cron, futhi leyo misebenzi, isimanga esimangalisayo, i-cronjob s. I-Cron: I-Cron ivela ku-chron, isiqalo sesiGreki esithi 'isikhathi'. I-Cron i-daemon esebenza ngezikhathi zokuqalisa kwesistimu.
Isho ukuthini i-* * * * * ku-cron?
* = njalo. Kuyi-wildcard yayo yonke ingxenye yesisho seshejuli ye-cron. Ngakho-ke i- * * * * * isho yonke iminithi yehora ngalinye lazo zonke izinsuku zenyanga ngayinye kanye nosuku ngalunye lweviki . … * 1 * * * – lokhu kusho ukuthi i-cron izosebenza umzuzu nomzuzu uma ihora lingu-1. Ngakho-ke 1:00 , 1:01 , … 1:59 .
Ngiwufunda kanjani umsebenzi we-cron?
- I-Cron iyinsiza ye-Linux yokuhlela imibhalo nemiyalo. …
- Ukufaka kuhlu yonke imisebenzi ye-cron ehleliwe yomsebenzisi wamanje, faka: crontab -l. …
- Ukufaka ohlwini imisebenzi ye-cron yehora faka okulandelayo efasiteleni letheminali: ls –la /etc/cron.hourly. …
- Ukufaka ohlwini imisebenzi ye-cron yansuku zonke, faka umyalo: ls -la /etc/cron.daily.
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Iyini imisebenzi ye-cron ku-Java?
I-Cron isihleli somsebenzi esisekelwe ngesikhathi. Ivumela uhlelo lwethu lokusebenza ukuhlela umsebenzi ukuthi usebenze ngokuzenzakalelayo ngesikhathi noma idethi ethile. Umsebenzi (owaziwa nangokuthi Umsebenzi) yinoma iyiphi imojula ofisa ukuyisebenzisa.
Ithini incazelo ye-cron job?
I-software utility cron eyaziwa nangokuthi i-cron job iwuhlelo lomsebenzi olususelwe esikhathini kuzinhlelo zokusebenza zekhompyutha ezifana ne-Unix. Abasebenzisi abasetha futhi bagcine izindawo zesofthiwe basebenzisa i-cron ukuhlela imisebenzi (imiyalo noma imibhalo yegobolondo) ukuze isebenze ngezikhathi ezithile ngezikhathi ezimisiwe, izinsuku, noma izikhawu.
Ngiwungeza kanjani umsebenzi we-cron?
Ungeza kanjani Imisebenzi ye-Cron
- Okokuqala, i-SSH kuseva yakho njengomsebenzisi wesayithi ofuna ukungeza umsebenzi we-cron kuwo.
- Faka umyalo crontab -e ukuze uveze umhleli womsebenzi we-cron.
- Uma kungokokuqala wenze lokhu, umyalo uzokucela ukuthi 'Khetha umhleli'. …
- Engeza umyalo wakho we-cron emugqeni omusha.
- Londoloza ifayela le-crontab bese uphuma.
I-crontab isebenzisa siphi isikhathi?
cron isebenzisa isikhathi sendawo. /etc/default/cron nokunye okucaciswa kwe-TZ ku-crontab vele ucacise ukuthi yini i-TZ okufanele isetshenziselwe izinqubo eziqalwe yi-cron, ayithinti isikhathi sokuqala.
Ngiwumisa kanjani umsebenzi we-cron?
Ukumisa i-cron ekusebenzeni, bulala umyalo ngokubhekisela ku-PID. Ibuyela ekuphumeni komyalo, ikholomu yesibili ukusuka kwesokunxele yi-PID 6876. Manje usungasebenzisa i-ps ufx | grep cron umyalo wokuqinisekisa ukuthi umsebenzi we-Magento cron awusasebenzi. Umsebenzi wakho we-Magento cron manje uzoqhubeka njengoba kuhleliwe.
Ikuphi i-crontab ku-Linux?
Uma udala ifayela le-crontab, lifakwa ngokuzenzakalelayo kuhla lwemibhalo /var/spool/cron/crontabs futhi linikezwa igama lakho lomsebenzisi. Ungakha noma uhlele ifayela le-crontab lomunye umsebenzisi, noma impande, uma unamalungelo omsebenzisi omkhulu. Faka imiyalo ye-crontab njengoba kuchazwe "ku-Syntax ye-crontab File Entries".
Iyini i-Cron nsuku zonke?
Uhlelo lwe-anacron lusebenzisa izinhlelo ezitholakala ku-/etc/cron. nsuku zonke kanye ngosuku; isebenzisa imisebenzi etholakala ku-/etc/cron. njalo ngesonto kanye ngesonto, kanye nemisebenzi ku-cron. njalo ngenyanga kanye ngenyanga. Qaphela izikhathi zokulibaziseka ezishiwo emugqeni ngamunye ezisiza ukuvimbela le misebenzi ekudluleleni yona kanye neminye imisebenzi ye-cron.
Ngiwuqala kanjani kabusha umsebenzi we-cron?
Qala/Misa/Qalisa kabusha insiza ye-cron ku-Redhat/Fedora/CentOS
- Qala isevisi ye-cron. Ukuze uqale isevisi ye-cron, faka: /etc/init.d/crond start. …
- Misa isevisi ye-cron. Ukumisa isevisi ye-cron, faka: /etc/init.d/crond stop. …
- Qala kabusha isevisi ye-cron. …
- Qala isevisi ye-cron. …
- Misa isevisi ye-cron. …
- Qala kabusha isevisi ye-cron.
Likuphi ifayela le-cron?
Amafayela e-crontab agcinwe kokuthi /var/spool/cron/crontabs. Amafayela amaningana e-crontab ngaphandle kwezimpande anikezwa ngesikhathi sokufakwa kwesoftware ye-SunOS (bona ithebula elilandelayo). Ngaphandle kwefayela le-crontab elizenzakalelayo, abasebenzisi bangakha amafayela e-crontab ukuze bahlele imicimbi yabo yesistimu.