{"id":476580,"date":"2023-08-09T07:31:20","date_gmt":"2023-08-09T07:31:20","guid":{"rendered":""},"modified":"2023-09-05T11:13:01","modified_gmt":"2023-09-05T11:13:01","slug":"daemon","status":"publish","type":"wiki","link":"https:\/\/oneproxy.pro\/vn\/wiki\/daemon\/","title":{"rendered":"Daemon"},"content":{"rendered":"<p>Trong l\u0129nh v\u1ef1c \u0111i\u1ec7n to\u00e1n, daemon l\u00e0 m\u1ed9t lo\u1ea1i quy tr\u00ecnh n\u1ec1n ch\u1ea1y li\u00ean t\u1ee5c, th\u1ef1c hi\u1ec7n c\u00e1c t\u00e1c v\u1ee5 c\u1ee5 th\u1ec3 \u0111\u1ec3 h\u1ed7 tr\u1ee3 ho\u1ea1t \u0111\u1ed9ng c\u1ee7a c\u00e1c \u1ee9ng d\u1ee5ng ph\u1ea7n m\u1ec1m kh\u00e1c nhau v\u00e0 ch\u00ednh h\u1ec7 \u0111i\u1ec1u h\u00e0nh. Kh\u00f4ng gi\u1ed1ng nh\u01b0 c\u00e1c ch\u01b0\u01a1ng tr\u00ecnh th\u00f4ng th\u01b0\u1eddng, daemon kh\u00f4ng \u0111\u01b0\u1ee3c kh\u1edfi t\u1ea1o b\u1edfi s\u1ef1 t\u01b0\u01a1ng t\u00e1c tr\u1ef1c ti\u1ebfp c\u1ee7a ng\u01b0\u1eddi d\u00f9ng m\u00e0 \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t khi kh\u1edfi \u0111\u1ed9ng h\u1ec7 th\u1ed1ng ho\u1eb7c c\u00e1c s\u1ef1 ki\u1ec7n c\u1ee5 th\u1ec3. Ch\u00fang th\u01b0\u1eddng \u0111\u01b0\u1ee3c t\u00ecm th\u1ea5y trong c\u00e1c h\u1ec7 \u0111i\u1ec1u h\u00e0nh d\u1ef1a tr\u00ean Unix v\u00e0 c\u00e1c d\u1eabn xu\u1ea5t c\u1ee7a ch\u00fang, m\u1eb7c d\u00f9 c\u00e1c kh\u00e1i ni\u1ec7m t\u01b0\u01a1ng t\u1ef1 v\u1eabn t\u1ed3n t\u1ea1i trong c\u00e1c n\u1ec1n t\u1ea3ng \u0111i\u1ec7n to\u00e1n kh\u00e1c.<\/p>\n<h2>L\u1ecbch s\u1eed ngu\u1ed3n g\u1ed1c c\u1ee7a Daemon v\u00e0 s\u1ef1 \u0111\u1ec1 c\u1eadp \u0111\u1ea7u ti\u00ean v\u1ec1 n\u00f3<\/h2>\n<p>Thu\u1eadt ng\u1eef \u201cdaemon\u201d c\u00f3 ngu\u1ed3n g\u1ed1c t\u1eeb th\u1ea7n tho\u1ea1i Hy L\u1ea1p c\u1ed5 \u0111\u1ea1i, n\u01a1i n\u00f3 \u0111\u1ec1 c\u1eadp \u0111\u1ebfn nh\u1eefng sinh v\u1eadt si\u00eau nhi\u00ean nh\u00e2n t\u1eeb ho\u1eb7c nh\u1eefng linh h\u1ed3n \u0111\u00f3ng vai tr\u00f2 trung gian gi\u1eefa con ng\u01b0\u1eddi v\u00e0 c\u00e1c v\u1ecb th\u1ea7n. Kh\u00e1i ni\u1ec7m daemon nh\u01b0 c\u00e1c ti\u1ebfn tr\u00ecnh n\u1ec1n trong \u0111i\u1ec7n to\u00e1n xu\u1ea5t hi\u1ec7n trong nh\u1eefng ng\u00e0y \u0111\u1ea7u ph\u00e1t tri\u1ec3n Unix v\u00e0o nh\u1eefng n\u0103m 1960. H\u1ec7 \u0111i\u1ec1u h\u00e0nh Multics \u0111\u00e3 \u0111\u01b0a ra \u00fd t\u01b0\u1edfng v\u1ec1 c\u00e1c ti\u1ebfn tr\u00ecnh n\u1ec1n, sau n\u00e0y \u0111\u00e3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a Unix.<\/p>\n<p>L\u1ea7n \u0111\u1ea7u ti\u00ean \u0111\u1ec1 c\u1eadp \u0111\u1ebfn thu\u1eadt ng\u1eef \u201cdaemon\u201d trong b\u1ed1i c\u1ea3nh \u0111i\u1ec7n to\u00e1n c\u00f3 t\u1eeb \u0111\u1ea7u nh\u1eefng n\u0103m 1970 trong C\u1ea9m nang l\u1eadp tr\u00ecnh vi\u00ean Unix. N\u00f3 \u0111\u1ec1 c\u1eadp \u0111\u1ebfn m\u1ed9t t\u1eadp h\u1ee3p c\u00e1c quy tr\u00ecnh h\u1ec7 th\u1ed1ng \u0111\u1eb7c bi\u1ec7t ch\u1ea1y \u1edf ch\u1ebf \u0111\u1ed9 n\u1ec1n v\u00e0 kh\u00f4ng \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi phi\u00ean cu\u1ed1i.<\/p>\n<h2>Th\u00f4ng tin chi ti\u1ebft v\u1ec1 Daemon: M\u1edf r\u1ed9ng ch\u1ee7 \u0111\u1ec1<\/h2>\n<p>Daemon \u0111\u00f3ng m\u1ed9t vai tr\u00f2 quan tr\u1ecdng trong ho\u1ea1t \u0111\u1ed9ng hi\u1ec7u qu\u1ea3 c\u1ee7a c\u00e1c h\u1ec7 th\u1ed1ng m\u00e1y t\u00ednh hi\u1ec7n \u0111\u1ea1i. H\u1ecd ch\u1ecbu tr\u00e1ch nhi\u1ec7m v\u1ec1 nhi\u1ec1u nhi\u1ec7m v\u1ee5 kh\u00e1c nhau nh\u01b0 qu\u1ea3n l\u00fd thi\u1ebft b\u1ecb ph\u1ea7n c\u1ee9ng, x\u1eed l\u00fd c\u00e1c d\u1ecbch v\u1ee5 m\u1ea1ng, l\u00ean l\u1ecbch t\u00e1c v\u1ee5 v\u00e0 \u0111\u1ea3m b\u1ea3o s\u1ef1 \u1ed5n \u0111\u1ecbnh c\u1ee7a h\u1ec7 th\u1ed1ng. M\u1ed9t s\u1ed1 \u0111\u1eb7c \u0111i\u1ec3m ch\u00ednh c\u1ee7a daemon bao g\u1ed3m:<\/p>\n<ul>\n<li>\n<p><strong>Ho\u1ea1t \u0111\u1ed9ng n\u1ec1n:<\/strong> Daemon ho\u1ea1t \u0111\u1ed9ng \u1edf ch\u1ebf \u0111\u1ed9 n\u1ec1n, \u0111\u1ed9c l\u1eadp v\u1edbi s\u1ef1 t\u01b0\u01a1ng t\u00e1c c\u1ee7a ng\u01b0\u1eddi d\u00f9ng. Ch\u00fang kh\u00f4ng y\u00eau c\u1ea7u gi\u00e1m s\u00e1t li\u00ean t\u1ee5c v\u00e0 c\u00f3 th\u1ec3 ch\u1ea1y mi\u1ec5n l\u00e0 h\u1ec7 th\u1ed1ng v\u1eabn ho\u1ea1t \u0111\u1ed9ng.<\/p>\n<\/li>\n<li>\n<p><strong>B\u1eaft \u0111\u1ea7u v\u00e0 k\u1ebft th\u00fac:<\/strong> Daemon th\u01b0\u1eddng \u0111\u01b0\u1ee3c kh\u1edfi \u0111\u1ed9ng trong qu\u00e1 tr\u00ecnh kh\u1edfi \u0111\u1ed9ng h\u1ec7 th\u1ed1ng ho\u1eb7c khi x\u1ea3y ra c\u00e1c s\u1ef1 ki\u1ec7n c\u1ee5 th\u1ec3. Ch\u00fang v\u1eabn ho\u1ea1t \u0111\u1ed9ng cho \u0111\u1ebfn khi t\u1eaft ho\u1eb7c khi h\u1ec7 th\u1ed1ng t\u1eaft.<\/p>\n<\/li>\n<li>\n<p><strong>Kh\u00f4ng c\u00f3 t\u01b0\u01a1ng t\u00e1c ng\u01b0\u1eddi d\u00f9ng tr\u1ef1c ti\u1ebfp:<\/strong> Kh\u00f4ng gi\u1ed1ng nh\u01b0 c\u00e1c ch\u01b0\u01a1ng tr\u00ecnh th\u00f4ng th\u01b0\u1eddng c\u00f3 giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng, daemon kh\u00f4ng c\u00f3 t\u01b0\u01a1ng t\u00e1c tr\u1ef1c ti\u1ebfp v\u1edbi ng\u01b0\u1eddi d\u00f9ng. Ch\u00fang ho\u1ea1t \u0111\u1ed9ng \u00e2m th\u1ea7m, cung c\u1ea5p d\u1ecbch v\u1ee5 cho c\u00e1c ch\u01b0\u01a1ng tr\u00ecnh v\u00e0 ng\u01b0\u1eddi d\u00f9ng kh\u00e1c m\u1ed9t c\u00e1ch gi\u00e1n ti\u1ebfp.<\/p>\n<\/li>\n<li>\n<p><strong>Qu\u1ea3n l\u00fd quy tr\u00ecnh:<\/strong> Daemon th\u01b0\u1eddng qu\u1ea3n l\u00fd c\u00e1c ti\u1ebfn tr\u00ecnh kh\u00e1c, sinh ra v\u00e0 ch\u1ea5m d\u1ee9t ch\u00fang khi c\u1ea7n thi\u1ebft \u0111\u1ec3 th\u1ef1c hi\u1ec7n c\u00e1c nhi\u1ec7m v\u1ee5 \u0111\u01b0\u1ee3c ch\u1ec9 \u0111\u1ecbnh.<\/p>\n<\/li>\n<li>\n<p><strong>Ghi nh\u1eadt k\u00fd v\u00e0 x\u1eed l\u00fd l\u1ed7i:<\/strong> C\u00e1c daemon th\u00edch h\u1ee3p bao g\u1ed3m c\u00e1c c\u01a1 ch\u1ebf ghi nh\u1eadt k\u00fd m\u1ea1nh m\u1ebd \u0111\u1ec3 ghi l\u1ea1i c\u00e1c ho\u1ea1t \u0111\u1ed9ng c\u1ee7a ch\u00fang v\u00e0 x\u1eed l\u00fd l\u1ed7i m\u1ed9t c\u00e1ch kh\u00e9o l\u00e9o \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o t\u00ednh \u1ed5n \u0111\u1ecbnh c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n<\/li>\n<\/ul>\n<h2>C\u1ea5u tr\u00fac b\u00ean trong c\u1ee7a Daemon: C\u00e1ch th\u1ee9c ho\u1ea1t \u0111\u1ed9ng c\u1ee7a Daemon<\/h2>\n<p>C\u1ea5u tr\u00fac b\u00ean trong c\u1ee7a daemon c\u00f3 th\u1ec3 kh\u00e1c nhau t\u00f9y thu\u1ed9c v\u00e0o m\u1ee5c \u0111\u00edch v\u00e0 c\u00e1ch tri\u1ec3n khai c\u1ee5 th\u1ec3 c\u1ee7a n\u00f3. N\u00f3i chung, m\u1ed9t daemon bao g\u1ed3m c\u00e1c th\u00e0nh ph\u1ea7n sau:<\/p>\n<ol>\n<li>\n<p><strong>Kh\u1edfi t\u1ea1o:<\/strong> Khi h\u1ec7 th\u1ed1ng kh\u1edfi \u0111\u1ed9ng, m\u1ed9t daemon s\u1ebd \u0111\u01b0\u1ee3c h\u1ec7 \u0111i\u1ec1u h\u00e0nh kh\u1edfi t\u1ea1o. N\u00f3 th\u01b0\u1eddng \u0111\u01b0\u1ee3c b\u1eaft \u0111\u1ea7u nh\u01b0 m\u1ed9t ti\u1ebfn tr\u00ecnh con c\u1ee7a ti\u1ebfn tr\u00ecnh init c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n<\/li>\n<li>\n<p><strong>C\u1ea5u h\u00ecnh:<\/strong> Daemon \u0111\u1ecdc c\u00e1c t\u1ec7p c\u1ea5u h\u00ecnh c\u1ee7a n\u00f3 trong qu\u00e1 tr\u00ecnh kh\u1edfi \u0111\u1ed9ng \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh h\u00e0nh vi, c\u00e0i \u0111\u1eb7t v\u00e0 t\u00e1c v\u1ee5 m\u00e0 n\u00f3 c\u1ea7n th\u1ef1c hi\u1ec7n.<\/p>\n<\/li>\n<li>\n<p><strong>Ph\u00e2n nh\u00e1nh v\u00e0 ch\u1ea5m d\u1ee9t ti\u1ebfn tr\u00ecnh g\u1ed1c:<\/strong> Sau khi kh\u1edfi t\u1ea1o, daemon th\u01b0\u1eddng t\u1ea1o m\u1ed9t ti\u1ebfn tr\u00ecnh m\u1edbi b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng <code data-no-translation=\"\">fork()<\/code> cu\u1ed9c g\u1ecdi h\u1ec7 th\u1ed1ng, cho ph\u00e9p qu\u00e1 tr\u00ecnh ban \u0111\u1ea7u k\u1ebft th\u00fac trong khi qu\u00e1 tr\u00ecnh m\u1edbi ti\u1ebfp t\u1ee5c ch\u1ea1y \u1edf ch\u1ebf \u0111\u1ed9 n\u1ec1n.<\/p>\n<\/li>\n<li>\n<p><strong>T\u00e1ch kh\u1ecfi Terminal:<\/strong> \u0110\u1ec3 \u0111\u1ea3m b\u1ea3o s\u1ef1 \u0111\u1ed9c l\u1eadp v\u1edbi c\u00e1c phi\u00ean cu\u1ed1i, daemon s\u1eed d\u1ee5ng <code data-no-translation=\"\">setsid()<\/code> l\u1ec7nh g\u1ecdi h\u1ec7 th\u1ed1ng \u0111\u1ec3 t\u1ea1o phi\u00ean m\u1edbi v\u00e0 t\u00e1ch ch\u00ednh n\u00f3 kh\u1ecfi m\u1ecdi li\u00ean k\u1ebft \u0111\u1ea7u cu\u1ed1i.<\/p>\n<\/li>\n<li>\n<p><strong>X\u1eed l\u00fd t\u00edn hi\u1ec7u:<\/strong> Daemon tri\u1ec3n khai tr\u00ecnh x\u1eed l\u00fd t\u00edn hi\u1ec7u \u0111\u1ec3 ph\u1ea3n h\u1ed3i c\u00e1c s\u1ef1 ki\u1ec7n c\u1ee5 th\u1ec3, ch\u1eb3ng h\u1ea1n nh\u01b0 \u0111\u1ecdc l\u1ea1i t\u1ec7p c\u1ea5u h\u00ecnh ho\u1eb7c t\u1eaft nh\u1eb9 nh\u00e0ng khi nh\u1eadn \u0111\u01b0\u1ee3c t\u00edn hi\u1ec7u k\u1ebft th\u00fac.<\/p>\n<\/li>\n<li>\n<p><strong>Th\u1ef1c hi\u1ec7n nhi\u1ec7m v\u1ee5:<\/strong> Sau khi thi\u1ebft l\u1eadp, daemon s\u1ebd \u0111i v\u00e0o v\u00f2ng l\u1eb7p ch\u00ednh c\u1ee7a n\u00f3, th\u1ef1c hi\u1ec7n c\u00e1c t\u00e1c v\u1ee5 \u0111\u01b0\u1ee3c ch\u1ec9 \u0111\u1ecbnh v\u00e0 ch\u1edd c\u00e1c s\u1ef1 ki\u1ec7n k\u00edch ho\u1ea1t c\u00e1c h\u00e0nh \u0111\u1ed9ng ti\u1ebfp theo.<\/p>\n<\/li>\n<\/ol>\n<h2>Ph\u00e2n t\u00edch c\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a Daemon<\/h2>\n<p>C\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a daemon r\u1ea5t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi ch\u1ee9c n\u0103ng v\u00e0 t\u00ednh hi\u1ec7u qu\u1ea3 c\u1ee7a ch\u00fang trong vi\u1ec7c h\u1ed7 tr\u1ee3 c\u00e1c ho\u1ea1t \u0111\u1ed9ng h\u1ec7 th\u1ed1ng kh\u00e1c nhau. H\u00e3y c\u00f9ng t\u00ecm hi\u1ec3u s\u00e2u h\u01a1n v\u1ec1 c\u00e1c t\u00ednh n\u0103ng n\u00e0y:<\/p>\n<ol>\n<li>\n<p><strong>Hi\u1ec7u qu\u1ea3:<\/strong> Daemon \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 ho\u1ea1t \u0111\u1ed9ng hi\u1ec7u qu\u1ea3 \u1edf ch\u1ebf \u0111\u1ed9 n\u1ec1n, s\u1eed d\u1ee5ng t\u00e0i nguy\u00ean h\u1ec7 th\u1ed1ng m\u1ed9t c\u00e1ch th\u1eadn tr\u1ecdng \u0111\u1ec3 tr\u00e1nh c\u1ea3n tr\u1edf t\u01b0\u01a1ng t\u00e1c c\u1ee7a ng\u01b0\u1eddi d\u00f9ng ho\u1eb7c c\u00e1c quy tr\u00ecnh quan tr\u1ecdng kh\u00e1c.<\/p>\n<\/li>\n<li>\n<p><strong>\u0110\u1ed9 tin c\u1eady:<\/strong> L\u00e0 c\u00e1c quy tr\u00ecnh ch\u1ea1y d\u00e0i, daemon \u0111\u01b0\u1ee3c k\u1ef3 v\u1ecdng l\u00e0 \u0111\u00e1ng tin c\u1eady v\u00e0 c\u00f3 kh\u1ea3 n\u0103ng ch\u1ed1ng l\u1ea1i s\u1ef1 c\u1ed1. Ch\u00fang th\u01b0\u1eddng bao g\u1ed3m c\u01a1 ch\u1ebf x\u1eed l\u00fd l\u1ed7i v\u00e0 ghi nh\u1eadt k\u00fd \u0111\u1ec3 ch\u1ea9n \u0111o\u00e1n v\u00e0 ph\u1ee5c h\u1ed3i sau l\u1ed7i.<\/p>\n<\/li>\n<li>\n<p><strong>Uy\u1ec3n chuy\u1ec3n:<\/strong> Daemon c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c t\u00f9y ch\u1ec9nh v\u00e0 c\u1ea5u h\u00ecnh \u0111\u1ec3 ph\u00f9 h\u1ee3p v\u1edbi y\u00eau c\u1ea7u c\u1ee5 th\u1ec3. H\u00e0nh vi c\u1ee7a ch\u00fang c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u0111i\u1ec1u ch\u1ec9nh th\u00f4ng qua c\u00e1c t\u1ec7p c\u1ea5u h\u00ecnh m\u00e0 kh\u00f4ng c\u1ea7n bi\u00ean d\u1ecbch l\u1ea1i.<\/p>\n<\/li>\n<li>\n<p><strong>Quy\u1ec1n t\u1ef1 tr\u1ecb:<\/strong> Ho\u1ea1t \u0111\u1ed9ng t\u1ef1 ch\u1ee7, daemon c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n c\u00e1c t\u00e1c v\u1ee5 m\u00e0 kh\u00f4ng c\u1ea7n s\u1ef1 can thi\u1ec7p c\u1ee7a ng\u01b0\u1eddi d\u00f9ng, \u0111\u1ea3m b\u1ea3o r\u1eb1ng c\u00e1c d\u1ecbch v\u1ee5 h\u1ec7 th\u1ed1ng quan tr\u1ecdng lu\u00f4n s\u1eb5n s\u00e0ng.<\/p>\n<\/li>\n<\/ol>\n<h2>C\u00e1c lo\u1ea1i Daemon: B\u1ea3ng v\u00e0 Danh s\u00e1ch<\/h2>\n<p>C\u00f3 r\u1ea5t nhi\u1ec1u lo\u1ea1i daemon, m\u1ed7i lo\u1ea1i ph\u1ee5c v\u1ee5 c\u00e1c m\u1ee5c \u0111\u00edch c\u1ee5 th\u1ec3 v\u00e0 \u0111\u00f3ng m\u1ed9t vai tr\u00f2 quan tr\u1ecdng trong ho\u1ea1t \u0111\u1ed9ng chung c\u1ee7a h\u1ec7 \u0111i\u1ec1u h\u00e0nh. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 lo\u1ea1i daemon ph\u1ed5 bi\u1ebfn:<\/p>\n<table>\n<thead>\n<tr>\n<th>Lo\u1ea1i daemon<\/th>\n<th>S\u1ef1 mi\u00eau t\u1ea3<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Tr\u00ecnh n\u1ec1n m\u1ea1ng<\/strong><\/td>\n<td>Qu\u1ea3n l\u00fd c\u00e1c d\u1ecbch v\u1ee5 m\u1ea1ng, ch\u1eb3ng h\u1ea1n nh\u01b0 HTTP (v\u00ed d\u1ee5: Apache), DNS (v\u00ed d\u1ee5: Bind) v\u00e0 email (v\u00ed d\u1ee5: Sendmail).<\/td>\n<\/tr>\n<tr>\n<td><strong>Tr\u00ecnh n\u1ec1n h\u1ec7 th\u1ed1ng<\/strong><\/td>\n<td>X\u1eed l\u00fd c\u00e1c ch\u1ee9c n\u0103ng c\u1ed1t l\u00f5i c\u1ee7a h\u1ec7 th\u1ed1ng, ch\u1eb3ng h\u1ea1n nh\u01b0 l\u1eadp l\u1ecbch t\u00e1c v\u1ee5 (v\u00ed d\u1ee5: Cron), ghi nh\u1eadt k\u00fd (v\u00ed d\u1ee5: syslogd) v\u00e0 qu\u1ea3n l\u00fd ngu\u1ed3n.<\/td>\n<\/tr>\n<tr>\n<td><strong>Tr\u00ecnh n\u1ec1n thi\u1ebft b\u1ecb<\/strong><\/td>\n<td>Ki\u1ec3m so\u00e1t c\u00e1c thi\u1ebft b\u1ecb ph\u1ea7n c\u1ee9ng, bao g\u1ed3m m\u00e1y in (v\u00ed d\u1ee5: CUPS) v\u00e0 thi\u1ebft b\u1ecb l\u01b0u tr\u1eef (v\u00ed d\u1ee5: udev).<\/td>\n<\/tr>\n<tr>\n<td><strong>Daemon c\u01a1 s\u1edf d\u1eef li\u1ec7u<\/strong><\/td>\n<td>Cung c\u1ea5p c\u00e1c d\u1ecbch v\u1ee5 c\u01a1 s\u1edf d\u1eef li\u1ec7u, nh\u01b0 MySQL v\u00e0 PostgreSQL.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>C\u00e1ch s\u1eed d\u1ee5ng Daemon, c\u00e1c v\u1ea5n \u0111\u1ec1 v\u00e0 gi\u1ea3i ph\u00e1p li\u00ean quan \u0111\u1ebfn vi\u1ec7c s\u1eed d\u1ee5ng<\/h2>\n<p>Daemon l\u00e0 th\u00e0nh ph\u1ea7n thi\u1ebft y\u1ebfu c\u1ee7a h\u1ec7 \u0111i\u1ec1u h\u00e0nh v\u00e0 c\u00e1ch s\u1eed d\u1ee5ng ch\u00fang r\u1ea5t \u0111a d\u1ea1ng. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng ph\u1ed5 bi\u1ebfn:<\/p>\n<ol>\n<li>\n<p><strong>M\u00e1y ch\u1ee7 Web:<\/strong> C\u00e1c daemon m\u1ea1ng nh\u01b0 Apache v\u00e0 Nginx \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i l\u00e0m m\u00e1y ch\u1ee7 web, ph\u1ee5c v\u1ee5 c\u00e1c trang web cho tr\u00ecnh duy\u1ec7t c\u1ee7a ng\u01b0\u1eddi d\u00f9ng.<\/p>\n<\/li>\n<li>\n<p><strong>Sao l\u01b0u t\u1ef1 \u0111\u1ed9ng:<\/strong> Tr\u00ecnh n\u1ec1n h\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp \u0111\u1ec3 th\u1ef1c hi\u1ec7n sao l\u01b0u t\u1ef1 \u0111\u1ed9ng c\u00e1c t\u1ec7p c\u1ea5u h\u00ecnh v\u00e0 d\u1eef li\u1ec7u quan tr\u1ecdng.<\/p>\n<\/li>\n<li>\n<p><strong>D\u1ecbch v\u1ee5 in:<\/strong> Tr\u00ecnh n\u1ec1n c\u1ee7a thi\u1ebft b\u1ecb, ch\u1eb3ng h\u1ea1n nh\u01b0 CUPS, qu\u1ea3n l\u00fd l\u1ec7nh in v\u00e0 cung c\u1ea5p quy\u1ec1n truy c\u1eadp v\u00e0o m\u00e1y in tr\u00ean m\u1ea1ng.<\/p>\n<\/li>\n<\/ol>\n<p>Tuy nhi\u00ean, c\u1ea5u h\u00ecnh kh\u00f4ng \u0111\u00fang ho\u1eb7c s\u1ef1 c\u1ed1 v\u1edbi daemon c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn c\u00e1c s\u1ef1 c\u1ed1 nh\u01b0 c\u1ea1n ki\u1ec7t t\u00e0i nguy\u00ean, l\u1ed7 h\u1ed5ng b\u1ea3o m\u1eadt ho\u1eb7c th\u1eadm ch\u00ed l\u00e0 s\u1ef1 c\u1ed1 h\u1ec7 th\u1ed1ng. \u0110\u1ec3 gi\u1ea3m thi\u1ec3u nh\u1eefng v\u1ea5n \u0111\u1ec1 n\u00e0y, c\u00e1c gi\u1ea3i ph\u00e1p sau th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng:<\/p>\n<ul>\n<li>\n<p><strong>C\u1eadp nh\u1eadt th\u01b0\u1eddng xuy\u00ean:<\/strong> Lu\u00f4n c\u1eadp nh\u1eadt daemon v\u00e0 h\u1ec7 \u0111i\u1ec1u h\u00e0nh v\u1edbi c\u00e1c b\u1ea3n v\u00e1 l\u1ed7i v\u00e0 b\u1ea3n s\u1eeda l\u1ed7i b\u1ea3o m\u1eadt m\u1edbi nh\u1ea5t \u0111\u1ec3 gi\u1ea3i quy\u1ebft c\u00e1c l\u1ed7 h\u1ed5ng \u0111\u00e3 bi\u1ebft.<\/p>\n<\/li>\n<li>\n<p><strong>Gi\u00e1m s\u00e1t v\u00e0 ghi nh\u1eadt k\u00fd:<\/strong> Tri\u1ec3n khai c\u00e1c c\u00f4ng c\u1ee5 gi\u00e1m s\u00e1t v\u00e0 ghi nh\u1eadt k\u00fd t\u1eadp trung \u0111\u1ec3 ch\u1ee7 \u0111\u1ed9ng ph\u00e1t hi\u1ec7n v\u00e0 kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1 li\u00ean quan \u0111\u1ebfn daemon.<\/p>\n<\/li>\n<li>\n<p><strong>Qu\u1ea3n l\u00fd ngu\u1ed3n t\u00e0i nguy\u00ean:<\/strong> \u0110\u1ecbnh c\u1ea5u h\u00ecnh daemon \u0111\u1ec3 s\u1eed d\u1ee5ng t\u00e0i nguy\u00ean m\u1ed9t c\u00e1ch th\u1eadn tr\u1ecdng, h\u1ea1n ch\u1ebf t\u00e1c \u0111\u1ed9ng c\u1ee7a ch\u00fang \u0111\u1ebfn hi\u1ec7u su\u1ea5t h\u1ec7 th\u1ed1ng v\u00e0 ng\u0103n ch\u1eb7n t\u00ecnh tr\u1ea1ng c\u1ea1n ki\u1ec7t t\u00e0i nguy\u00ean.<\/p>\n<\/li>\n<li>\n<p><strong>Quy t\u1eafc t\u01b0\u1eddng l\u1eeda:<\/strong> Thi\u1ebft l\u1eadp c\u00e1c quy t\u1eafc t\u01b0\u1eddng l\u1eeda \u0111\u1ec3 h\u1ea1n ch\u1ebf quy\u1ec1n truy c\u1eadp v\u00e0o daemon t\u1eeb c\u00e1c m\u1ea1ng kh\u00f4ng \u0111\u00e1ng tin c\u1eady, gi\u1ea3m b\u1ec1 m\u1eb7t t\u1ea5n c\u00f4ng.<\/p>\n<\/li>\n<\/ul>\n<h2>C\u00e1c \u0111\u1eb7c \u0111i\u1ec3m ch\u00ednh v\u00e0 nh\u1eefng so s\u00e1nh kh\u00e1c v\u1edbi c\u00e1c thu\u1eadt ng\u1eef t\u01b0\u01a1ng t\u1ef1<\/h2>\n<h3>Daemon so v\u1edbi d\u1ecbch v\u1ee5<\/h3>\n<p>C\u00e1c thu\u1eadt ng\u1eef \u201cdaemon\u201d v\u00e0 \u201cservice\u201d th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng thay th\u1ebf cho nhau, nh\u01b0ng c\u00f3 s\u1ef1 kh\u00e1c bi\u1ec7t tinh t\u1ebf gi\u1eefa hai thu\u1eadt ng\u1eef n\u00e0y. Trong khi daemon l\u00e0 c\u00e1c ti\u1ebfn tr\u00ecnh n\u1ec1n ch\u1ea1y li\u00ean t\u1ee5c th\u00ec d\u1ecbch v\u1ee5 l\u00e0 c\u00e1c ph\u1ea7n tr\u1eebu t\u01b0\u1ee3ng \u1edf c\u1ea5p \u0111\u1ed9 cao h\u01a1n bao g\u1ed3m m\u1ed9t t\u1eadp h\u1ee3p c\u00e1c daemon ho\u1eb7c c\u00e1c th\u00e0nh ph\u1ea7n kh\u00e1c ho\u1ea1t \u0111\u1ed9ng c\u00f9ng nhau \u0111\u1ec3 cung c\u1ea5p ch\u1ee9c n\u0103ng c\u1ee5 th\u1ec3.<\/p>\n<h3>Daemon so v\u1edbi ti\u1ebfn tr\u00ecnh<\/h3>\n<p>Quy tr\u00ecnh l\u00e0 m\u1ed9t thu\u1eadt ng\u1eef r\u1ed9ng h\u01a1n bao g\u1ed3m b\u1ea5t k\u1ef3 ch\u01b0\u01a1ng tr\u00ecnh \u0111ang ch\u1ea1y n\u00e0o, bao g\u1ed3m c\u1ea3 tr\u00ecnh n\u1ec1n v\u00e0 ch\u01b0\u01a1ng tr\u00ecnh ti\u1ec1n c\u1ea3nh th\u00f4ng th\u01b0\u1eddng. S\u1ef1 kh\u00e1c bi\u1ec7t ch\u00ednh n\u1eb1m \u1edf ho\u1ea1t \u0111\u1ed9ng n\u1ec1n c\u1ee7a daemon v\u00e0 t\u00ednh \u0111\u1ed9c l\u1eadp c\u1ee7a n\u00f3 v\u1edbi s\u1ef1 t\u01b0\u01a1ng t\u00e1c c\u1ee7a ng\u01b0\u1eddi d\u00f9ng.<\/p>\n<h2>Quan \u0111i\u1ec3m v\u00e0 c\u00f4ng ngh\u1ec7 c\u1ee7a t\u01b0\u01a1ng lai li\u00ean quan \u0111\u1ebfn Daemon<\/h2>\n<p>Khi c\u00f4ng ngh\u1ec7 ph\u00e1t tri\u1ec3n, vai tr\u00f2 c\u1ee7a daemon s\u1ebd ti\u1ebfp t\u1ee5c m\u1edf r\u1ed9ng. Nh\u1eefng ti\u1ebfn b\u1ed9 trong container h\u00f3a, d\u1ecbch v\u1ee5 vi m\u00f4 v\u00e0 \u0111i\u1ec7n to\u00e1n \u0111\u00e1m m\u00e2y c\u00f3 th\u1ec3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u00e1ch tri\u1ec3n khai v\u00e0 qu\u1ea3n l\u00fd daemon trong c\u00e1c h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n ph\u1ee9c t\u1ea1p. Tr\u1ecdng t\u00e2m s\u1ebd v\u1eabn l\u00e0 hi\u1ec7u qu\u1ea3, \u0111\u1ed9 tin c\u1eady v\u00e0 b\u1ea3o m\u1eadt v\u00ec daemon ti\u1ebfp t\u1ee5c \u0111\u00f3ng m\u1ed9t vai tr\u00f2 quan tr\u1ecdng trong ho\u1ea1t \u0111\u1ed9ng m\u1ea1nh m\u1ebd c\u1ee7a h\u1ec7 th\u1ed1ng m\u00e1y t\u00ednh.<\/p>\n<h2>C\u00e1ch m\u00e1y ch\u1ee7 proxy c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng ho\u1eb7c li\u00ean k\u1ebft v\u1edbi Daemon<\/h2>\n<p>M\u00e1y ch\u1ee7 proxy th\u01b0\u1eddng d\u1ef1a v\u00e0o daemon \u0111\u1ec3 qu\u1ea3n l\u00fd k\u1ebft n\u1ed1i m\u1ea1ng, n\u1ed9i dung b\u1ed9 \u0111\u1ec7m v\u00e0 x\u1eed l\u00fd c\u00e1c y\u00eau c\u1ea7u. V\u00ed d\u1ee5: c\u00e1c m\u00e1y ch\u1ee7 proxy ph\u1ed5 bi\u1ebfn nh\u01b0 Squid v\u00e0 HAProxy ho\u1ea1t \u0111\u1ed9ng nh\u01b0 daemon \u0111\u1ec3 cung c\u1ea5p c\u00e1c d\u1ecbch v\u1ee5 nh\u01b0 b\u1ed9 nh\u1edb \u0111\u1ec7m web v\u00e0 c\u00e2n b\u1eb1ng t\u1ea3i. B\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng daemon, m\u00e1y ch\u1ee7 proxy c\u00f3 th\u1ec3 x\u1eed l\u00fd hi\u1ec7u qu\u1ea3 s\u1ed1 l\u01b0\u1ee3ng l\u1edbn y\u00eau c\u1ea7u c\u1ee7a kh\u00e1ch h\u00e0ng, \u0111\u1ea3m b\u1ea3o lu\u1ed3ng d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c th\u00f4ng su\u1ed1t v\u00e0 t\u1ed1i \u01b0u h\u00f3a gi\u1eefa ng\u01b0\u1eddi d\u00f9ng v\u00e0 m\u00e1y ch\u1ee7 t\u1eeb xa.<\/p>\n<h2>Li\u00ean k\u1ebft li\u00ean quan<\/h2>\n<p>\u0110\u1ec3 bi\u1ebft th\u00eam th\u00f4ng tin v\u1ec1 daemon v\u00e0 c\u00e1c ch\u1ee7 \u0111\u1ec1 li\u00ean quan, b\u1ea1n c\u00f3 th\u1ec3 kh\u00e1m ph\u00e1 c\u00e1c li\u00ean k\u1ebft sau:<\/p>\n<ul>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Daemon_(computing)\" target=\"_new\" rel=\"noopener nofollow\">Wikipedia: Daemon (M\u00e1y t\u00ednh)<\/a><\/li>\n<li><a href=\"https:\/\/tldp.org\/LDP\/intro-linux\/html\/sect_03_01.html\" target=\"_new\" rel=\"noopener nofollow\">D\u1ef1 \u00e1n T\u00e0i li\u1ec7u Linux: Daemon<\/a><\/li>\n<li><a href=\"http:\/\/www.ee.surrey.ac.uk\/Teaching\/Unix\/unix3.html\" target=\"_new\" rel=\"noopener nofollow\">UNIX cho ng\u01b0\u1eddi m\u1edbi b\u1eaft \u0111\u1ea7u: Daemon<\/a><\/li>\n<\/ul>\n<p>Khi c\u00f4ng ngh\u1ec7 \u0111i\u1ec7n to\u00e1n ti\u1ebfn b\u1ed9, daemon s\u1ebd ti\u1ebfp t\u1ee5c \u0111\u00f3ng m\u1ed9t vai tr\u00f2 quan tr\u1ecdng trong ho\u1ea1t \u0111\u1ed9ng li\u1ec1n m\u1ea1ch c\u1ee7a h\u1ec7 th\u1ed1ng v\u00e0 \u1ee9ng d\u1ee5ng, \u0111\u1ea3m b\u1ea3o cung c\u1ea5p c\u00e1c d\u1ecbch v\u1ee5 hi\u1ec7u qu\u1ea3 v\u00e0 \u0111\u00e1ng tin c\u1eady cho ng\u01b0\u1eddi d\u00f9ng c\u0169ng nh\u01b0 doanh nghi\u1ec7p.<\/p>","protected":false},"featured_media":482660,"menu_order":0,"template":"","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"class_list":["post-476580","wiki","type-wiki","status-publish","has-post-thumbnail","hentry"],"acf":{"faq_title":"Frequently Asked Questions about <mark>Daemon: A Comprehensive Overview<\/mark>","faq_items":[{"question":"What is a daemon?","answer":"A daemon is a type of background process that runs continuously on a computer system, performing specific tasks to support the functioning of various software applications and the operating system. Unlike regular programs, daemons are not initiated by direct user interaction but are activated at system boot or specific events."},{"question":"How did the concept of daemons originate?","answer":"The term \"daemon\" has its origins in ancient Greek mythology, referring to benevolent supernatural beings or spirits. In computing, the concept of daemons emerged in the early days of Unix development in the 1960s, influenced by the Multics operating system. The first mention of the term \"daemon\" in computing can be found in the early 1970s Unix Programmer's Manual."},{"question":"What tasks do daemons perform?","answer":"Daemons have a wide range of responsibilities, including managing hardware devices, handling network services, scheduling tasks, and ensuring system stability. They work silently in the background, carrying out tasks without direct user interaction."},{"question":"How does a daemon operate?","answer":"When the system starts, a daemon is initialized by the operating system. It often reads its configuration files during startup to determine its behavior and tasks. After initialization, the daemon creates a new process, detaches from the terminal, and enters its main loop to execute designated tasks continuously."},{"question":"What are the key features of daemons?","answer":"Some key features of daemons include background operation, no direct user interaction, process management, and robust logging and error handling. These features enable daemons to run efficiently, reliably, and autonomously in the background."},{"question":"What are the types of daemons?","answer":"Daemons come in various types, each serving specific purposes. Common types include network daemons (e.g., Apache, Bind), system daemons (e.g., Cron, syslogd), device daemons (e.g., CUPS, udev), and database daemons (e.g., MySQL, PostgreSQL)."},{"question":"How can daemons be used, and what problems can arise?","answer":"Daemons are widely used for tasks like web serving, automated backups, and print services. However, improper configuration or issues with daemons can lead to problems like resource exhaustion, security vulnerabilities, or system crashes. Regular updates, monitoring, resource management, and firewall rules are among the solutions to mitigate these issues."},{"question":"How does the future look for daemons?","answer":"As technology advances, daemons will continue to play a crucial role in computer systems. Advancements in containerization, microservices, and cloud computing will influence how daemons are deployed and managed in complex distributed systems."},{"question":"How are proxy servers related to daemons?","answer":"Proxy servers, such as Squid and HAProxy, often utilize daemons to manage network connections, cache content, and handle requests. Daemons enable proxy servers to efficiently handle a large number of client requests, ensuring optimized data flow between users and remote servers."}]},"_links":{"self":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/476580","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki"}],"about":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/types\/wiki"}],"version-history":[{"count":0,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/476580\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media\/482660"}],"wp:attachment":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media?parent=476580"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}