Ngiwenza kanjani umsebenzi we-cron ku-Linux?
Ivula i-Crontab
Okokuqala, vula iwindi letheminali kumenyu yezinhlelo zokusebenza zedeskithophu ye-Linux. Ungachofoza isithonjana se-Dash, thayipha Itheminali bese ucindezela u-Enter ukuze uvule eyodwa uma usebenzisa Ubuntu. Sebenzisa umyalo we-crontab -e ukuze uvule ifayela le-crontab le-akhawunti yakho yomsebenzisi. Imiyalo kuleli fayela isebenza nezimvume ze-akhawunti yakho yomsebenzisi.
Iyini i-cron daemon?
Cron a I-daemon yayisetshenziselwa ukuhlela noma yiluphi uhlobo lomsebenzi ongawucabanga. Kuwusizo ukuthumela ama-imeyili ngezibalo zesistimu noma zohlelo, ukulungisa isimiso njalo, ukwenza izipele, noma ukwenza noma yimuphi umsebenzi ongase uwucabange. Kukhona izinhlelo ezifanayo kwamanye ama-Operating Systems.
Ingabe ngidinga ukuqalisa kabusha i-cron?
Cha akudingeki ukuthi uqale kabusha i-cron , izoqaphela izinguquko kumafayela akho e-crontab (okungaba /etc/crontab noma ifayela le-crontab labasebenzisi).
Ingabe i-cron isebenza njengenqubo ye-daemon?
UCron uyidaemon, inqubo ethatha isikhathi eside lokho kudinga ukuqaliswa kanye kuphela, futhi kuzosebenza njalo ngemuva. U-Cron uvuka njalo ngomzuzu, ahlole uhlu lwayo lwezinto okufanele zenziwe ukuze abone ukuthi ingabe ikhona yini imisebenzi ehleliwe edinga ukwenziwa, futhi uma kunjalo iyayenza. Uma kungenjalo, ibuyela ekulaleni eminye imizuzwana engama-59.
Ngazi kanjani ukuthi umsebenzi we-cron uyasebenza?
Ukuhlola ukubona ukuthi i-cron daemon iyasebenza yini, sesha izinqubo ezisebenzayo ngomyalo we-ps. Umyalo we-cron daemon uzovela kokuphumayo njenge-crond. Okufakiwe kulokhu okukhiphayo kwe-grep crond kunganakwa kodwa okunye okufakiwe kwe-crond kungabonwa kusebenza njengempande. Lokhu kubonisa ukuthi i-cron daemon iyasebenza.
Ngazi kanjani uma umsebenzi we-cron usebenza ku-Linux?
Indlela # 1: Ngokuhlola Isimo Sesevisi ye-Cron
Isebenzisa umyalo othi “systemctl” kanye nefulegi lesimo izohlola isimo sesevisi ye-Cron njengoba kukhonjisiwe esithombeni esingezansi. Uma isimo sithi "Iyasebenza (Iyasebenza)" kuzoqinisekiswa ukuthi i-crontab isebenza kahle kakhulu, uma kungenjalo.
Ngiyisebenzisa kanjani i-cron daemon?
Umyalo womsebenzisi wokusebenza nesevisi ye-cron ngu i-crontab (itafula le-cron). Ifayela le-crontab yifayela lombhalo elilula eliyalela i-cron daemon ukuthi yenze umsebenzi ngesikhathi esithile noma isikhawu. Noma yimuphi umsebenzisi angahlela imisebenzi ye-cron noma imisebenzi ohlelweni. Umsebenzi usebenza ngaphansi kwe-akhawunti yomsebenzisi odalwe ngayo.
Ngiwamisa kanjani ama-imeyili e-cron daemon?
Khubaza ama-imeyili e-cron usebenzisa ">/dev/null 2>&1”
- > = qondisa kabusha.
- 2>&1 = iqondisa kabusha i-stderr (amaphutha ajwayelekile) kanye ne-stdout (okukhiphayo okujwayelekile).
- -s = idlulisela phambili okuphumayo kulogi yesistimu.
- -m off = ikhubaza ama-imeyili e-cron.
- Ukufundwa okuhlobene: Nika amandla Ukuvuselelwa Okuzenzakalelayo - I-Fedora/Isigqoko Esibomvu/I-CentOS + Ithiphu Yebhonasi.
Siyini isikhathi se-cron?
Isoftware utility cron eyaziwa nangokuthi cron job is umhleli wemisebenzi esekwe isikhathi ku-Unix-njengamasistimu wokusebenza wekhompyutha. Abasebenzisi abamisa futhi bagcine izindawo zesofthiwe basebenzisa i-cron ukuhlela imisebenzi (imiyalo noma imibhalo yegobolondo) ukuze isebenze ngezikhathi ezithile ngezikhathi ezimisiwe, izinsuku, noma izikhawu.
Ngiwuqala kanjani kabusha umsebenzi we-cron?
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?
Inqubo
- Dala ifayela le-cron lombhalo we-ASCII, njenge-batchJob1. txt.
- Hlela ifayela le-cron usebenzisa isihleli sombhalo ukuze ufake umyalo wokuhlela isevisi. …
- Ukuze uqalise umsebenzi we-cron, faka umyalo we-crontab batchJob1. …
- Ukuze uqinisekise imisebenzi ehleliwe, faka umyalo crontab -1 . …
- Ukuze ususe imisebenzi ehleliwe, thayipha u-crontab -r .
Ngiwuvala kanjani umsebenzi we-cron?
Ungalisusa kanjani ifayela le-crontab
- Susa ifayela le-crontab. $ crontab -r [ igama lomsebenzisi ] lapho igama lomsebenzisi licacisa igama le-akhawunti yomsebenzisi ofuna ukuyikhipha ifayela le-crontab. …
- Qinisekisa ukuthi ifayela le-crontab lisusiwe. # ls /var/spool/cron/crontabs.