{"id":477759,"date":"2023-08-09T09:19:52","date_gmt":"2023-08-09T09:19:52","guid":{"rendered":""},"modified":"2023-09-05T11:15:22","modified_gmt":"2023-09-05T11:15:22","slug":"keepalive","status":"publish","type":"wiki","link":"https:\/\/oneproxy.pro\/vn\/wiki\/keepalive\/","title":{"rendered":"C\u1ed1 s\u1ed1ng \u0111i"},"content":{"rendered":"<p>Keepalive l\u00e0 m\u1ed9t c\u01a1 ch\u1ebf quan tr\u1ecdng trong m\u00f4i tr\u01b0\u1eddng m\u1ea1ng v\u00e0 m\u00e1y ch\u1ee7 proxy nh\u1eb1m \u0111\u1ea3m b\u1ea3o t\u00ednh \u1ed5n \u0111\u1ecbnh v\u00e0 hi\u1ec7u su\u1ea5t c\u1ee7a c\u00e1c k\u1ebft n\u1ed1i gi\u1eefa m\u00e1y kh\u00e1ch v\u00e0 m\u00e1y ch\u1ee7. N\u00f3 \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 duy tr\u00ec k\u1ebft n\u1ed1i li\u00ean t\u1ee5c v\u00e0 li\u00ean t\u1ee5c gi\u1eefa hai \u0111i\u1ec3m cu\u1ed1i, gi\u1ea3m \u0111\u1ed9 tr\u1ec5 v\u00e0 ng\u0103n ch\u1eb7n vi\u1ec7c ch\u1ea5m d\u1ee9t k\u1ebft n\u1ed1i s\u1edbm.<\/p>\n<h2>L\u1ecbch s\u1eed v\u1ec1 ngu\u1ed3n g\u1ed1c c\u1ee7a Keepalive v\u00e0 l\u1ea7n \u0111\u1ea7u ti\u00ean \u0111\u1ec1 c\u1eadp \u0111\u1ebfn n\u00f3.<\/h2>\n<p>Kh\u00e1i ni\u1ec7m Keepalive b\u1eaft ngu\u1ed3n t\u1eeb nh\u1eefng ng\u00e0y \u0111\u1ea7u c\u1ee7a Internet khi Giao th\u1ee9c \u0111i\u1ec1u khi\u1ec3n truy\u1ec1n d\u1eabn (TCP) \u0111\u01b0\u1ee3c gi\u1edbi thi\u1ec7u v\u00e0o nh\u1eefng n\u0103m 1970. TCP l\u00e0 m\u1ed9t giao th\u1ee9c \u0111\u00e1ng tin c\u1eady v\u00e0 h\u01b0\u1edbng \u0111\u1ebfn k\u1ebft n\u1ed1i, \u0111\u1ea3m b\u1ea3o vi\u1ec7c ph\u00e2n ph\u1ed1i d\u1eef li\u1ec7u gi\u1eefa c\u00e1c m\u00e1y ch\u1ee7. Tuy nhi\u00ean, trong m\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p, k\u1ebft n\u1ed1i m\u1ea1ng c\u00f3 th\u1ec3 kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng trong th\u1eddi gian d\u00e0i, d\u1eabn \u0111\u1ebfn m\u1ea5t k\u1ebft n\u1ed1i v\u00e0 thi\u1ebft l\u1eadp l\u1ea1i ch\u1eadm tr\u1ec5.<\/p>\n<p>\u0110\u1ec3 gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1 n\u00e0y, \u00fd t\u01b0\u1edfng \u201cKeepalive\u201d n\u1ed5i l\u00ean nh\u01b0 m\u1ed9t c\u00e1ch \u0111\u1ec3 duy tr\u00ec k\u1ebft n\u1ed1i TCP b\u1eb1ng c\u00e1ch g\u1eedi \u0111\u1ecbnh k\u1ef3 c\u00e1c g\u00f3i nh\u1ecf, c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 g\u00f3i Keepalive, \u0111\u1ec3 x\u00e1c nh\u1eadn r\u1eb1ng m\u00e1y ch\u1ee7 t\u1eeb xa v\u1eabn c\u00f3 th\u1ec3 truy c\u1eadp \u0111\u01b0\u1ee3c. Vi\u1ec7c \u0111\u1ec1 c\u1eadp \u0111\u1ebfn Keepalive l\u1ea7n \u0111\u1ea7u ti\u00ean c\u00f3 th\u1ec3 b\u1eaft ngu\u1ed3n t\u1eeb RFC 1122, xu\u1ea5t b\u1ea3n n\u0103m 1989, ti\u00eau chu\u1ea9n h\u00f3a giao th\u1ee9c TCP v\u00e0 gi\u1edbi thi\u1ec7u kh\u00e1i ni\u1ec7m v\u1ec1 Keepalive.<\/p>\n<h2>Th\u00f4ng tin chi ti\u1ebft v\u1ec1 Keepalive. M\u1edf r\u1ed9ng ch\u1ee7 \u0111\u1ec1 Keepalive.<\/h2>\n<p>Keepalive \u0111\u00f3ng vai tr\u00f2 nh\u01b0 m\u1ed9t c\u01a1 ch\u1ebf nh\u1ecbp tim cho ph\u00e9p m\u00e1y ch\u1ee7 proxy v\u00e0 thi\u1ebft b\u1ecb m\u1ea1ng theo d\u00f5i t\u00ecnh tr\u1ea1ng v\u00e0 tr\u1ea1ng th\u00e1i k\u1ebft n\u1ed1i m\u1ed9t c\u00e1ch t\u00edch c\u1ef1c. B\u1eb1ng c\u00e1ch trao \u0111\u1ed5i c\u00e1c g\u00f3i Keepalive \u0111\u1ecbnh k\u1ef3, m\u00e1y ch\u1ee7 c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh xem m\u00e1y kh\u00e1ch c\u00f3 c\u00f2n ph\u1ea3n h\u1ed3i v\u00e0 k\u1ebft n\u1ed1i hay kh\u00f4ng. N\u1ebfu kh\u00f4ng nh\u1eadn \u0111\u01b0\u1ee3c ph\u1ea3n h\u1ed3i cho g\u00f3i Keepalive trong khung th\u1eddi gian \u0111\u01b0\u1ee3c ch\u1ec9 \u0111\u1ecbnh, m\u00e1y ch\u1ee7 s\u1ebd gi\u1ea3 \u0111\u1ecbnh r\u1eb1ng m\u00e1y kh\u00e1ch kh\u00f4ng th\u1ec3 truy c\u1eadp \u0111\u01b0\u1ee3c n\u1eefa v\u00e0 c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n c\u00e1c h\u00e0nh \u0111\u1ed9ng th\u00edch h\u1ee3p, ch\u1eb3ng h\u1ea1n nh\u01b0 \u0111\u00f3ng k\u1ebft n\u1ed1i ho\u1eb7c b\u1eaft \u0111\u1ea7u c\u00e1c n\u1ed7 l\u1ef1c k\u1ebft n\u1ed1i l\u1ea1i.<\/p>\n<p>Keepalive ho\u1ea1t \u0111\u1ed9ng \u1edf l\u1edbp \u1ee9ng d\u1ee5ng v\u00e0 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c t\u00f9y ch\u1ec9nh d\u1ef1a tr\u00ean nhu c\u1ea7u c\u1ee5 th\u1ec3 c\u1ee7a \u1ee9ng d\u1ee5ng ho\u1eb7c m\u00f4i tr\u01b0\u1eddng m\u1ea1ng. N\u00f3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i trong c\u00e1c c\u00f4ng ngh\u1ec7 m\u1ea1ng kh\u00e1c nhau, bao g\u1ed3m c\u00e1c giao th\u1ee9c HTTP, HTTPS, TCP v\u00e0 WebSocket.<\/p>\n<h2>C\u1ea5u tr\u00fac b\u00ean trong c\u1ee7a Keepalive. Keepalive ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o<\/h2>\n<p>Ho\u1ea1t \u0111\u1ed9ng n\u1ed9i b\u1ed9 c\u1ee7a Keepalive bao g\u1ed3m ba th\u00e0nh ph\u1ea7n ch\u00ednh:<\/p>\n<ol>\n<li>\n<p><strong>\u0110\u1ed3ng h\u1ed3 b\u1ea5m gi\u1edd l\u01b0u gi\u1eef<\/strong>: B\u1ed9 h\u1eb9n gi\u1edd Keepalive \u0111\u01b0\u1ee3c \u0111\u1eb7t \u1edf ph\u00eda m\u00e1y ch\u1ee7 \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh kho\u1ea3ng th\u1eddi gian c\u00e1c g\u00f3i Keepalive s\u1ebd \u0111\u01b0\u1ee3c g\u1eedi \u0111\u1ebfn m\u00e1y kh\u00e1ch. Kho\u1ea3ng th\u1eddi gian h\u1eb9n gi\u1edd ph\u1ee5 thu\u1ed9c v\u00e0o y\u00eau c\u1ea7u c\u1ee7a m\u1ea1ng v\u00e0 \u1ee9ng d\u1ee5ng. Kho\u1ea3ng th\u1eddi gian ng\u1eafn h\u01a1n \u0111\u1ea3m b\u1ea3o ph\u00e1t hi\u1ec7n nhanh h\u01a1n c\u00e1c m\u00e1y kh\u00e1ch kh\u00f4ng ph\u1ea3n h\u1ed3i nh\u01b0ng c\u00f3 th\u1ec3 l\u00e0m t\u0103ng chi ph\u00ed m\u1ea1ng.<\/p>\n<\/li>\n<li>\n<p><strong>G\u00f3i l\u01b0u gi\u1eef<\/strong>: G\u00f3i Keepalive l\u00e0 m\u1ed9t tin nh\u1eafn nh\u1ecf, nh\u1eb9 \u0111\u01b0\u1ee3c m\u00e1y ch\u1ee7 g\u1eedi \u0111\u1ebfn m\u00e1y kh\u00e1ch. N\u00f3 ch\u1ee9a d\u1eef li\u1ec7u t\u1ed1i thi\u1ec3u v\u00e0 ch\u1ee7 y\u1ebfu \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 g\u1ee3i ra ph\u1ea3n h\u1ed3i t\u1eeb kh\u00e1ch h\u00e0ng.<\/p>\n<\/li>\n<li>\n<p><strong>Ph\u1ea3n \u1ee9ng duy tr\u00ec<\/strong>: Khi m\u00e1y kh\u00e1ch nh\u1eadn \u0111\u01b0\u1ee3c g\u00f3i Keepalive, n\u00f3 ph\u1ea3i ph\u1ea3n h\u1ed3i b\u1eb1ng m\u1ed9t x\u00e1c nh\u1eadn ho\u1eb7c tr\u1ea1ng th\u00e1i c\u1eadp nh\u1eadt. Ph\u1ea3n h\u1ed3i cho bi\u1ebft m\u00e1y kh\u00e1ch v\u1eabn \u0111ang ho\u1ea1t \u0111\u1ed9ng v\u00e0 \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i.<\/p>\n<\/li>\n<\/ol>\n<p>S\u1ef1 t\u01b0\u01a1ng t\u00e1c gi\u1eefa c\u00e1c th\u00e0nh ph\u1ea7n n\u00e0y \u0111\u1ea3m b\u1ea3o r\u1eb1ng k\u1ebft n\u1ed1i gi\u1eefa m\u00e1y kh\u00e1ch v\u00e0 m\u00e1y ch\u1ee7 v\u1eabn ho\u1ea1t \u0111\u1ed9ng v\u00e0 ph\u1ea3n h\u1ed3i nhanh.<\/p>\n<h2>Ph\u00e2n t\u00edch c\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a Keepalive.<\/h2>\n<p>Keepalive cung c\u1ea5p m\u1ed9t s\u1ed1 t\u00ednh n\u0103ng c\u1ea7n thi\u1ebft gi\u00fap n\u00f3 tr\u1edf th\u00e0nh m\u1ed9t th\u00e0nh ph\u1ea7n c\u00f3 gi\u00e1 tr\u1ecb trong m\u00f4i tr\u01b0\u1eddng m\u00e1y ch\u1ee7 proxy:<\/p>\n<ol>\n<li>\n<p><strong>S\u1ef1 ki\u00ean tr\u00ec k\u1ebft n\u1ed1i<\/strong>: Keepalive duy tr\u00ec c\u00e1c k\u1ebft n\u1ed1i li\u00ean t\u1ee5c gi\u1eefa m\u00e1y kh\u00e1ch v\u00e0 m\u00e1y ch\u1ee7, gi\u1ea3m chi ph\u00ed thi\u1ebft l\u1eadp k\u1ebft n\u1ed1i v\u00e0 gi\u1ea3m thi\u1ec3u \u0111\u1ed9 tr\u1ec5.<\/p>\n<\/li>\n<li>\n<p><strong>Ph\u00e1t hi\u1ec7n l\u1ed7i<\/strong>: B\u1eb1ng c\u00e1ch ki\u1ec3m tra \u0111\u1ecbnh k\u1ef3 ph\u1ea3n h\u1ed3i c\u1ee7a kh\u00e1ch h\u00e0ng, Keepalive gi\u00fap x\u00e1c \u0111\u1ecbnh v\u00e0 x\u1eed l\u00fd k\u1ecbp th\u1eddi c\u00e1c kh\u00e1ch h\u00e0ng kh\u00f4ng ph\u1ea3n h\u1ed3i ho\u1eb7c b\u1ecb ng\u1eaft k\u1ebft n\u1ed1i.<\/p>\n<\/li>\n<li>\n<p><strong>T\u1ed1i \u01b0u h\u00f3a t\u00e0i nguy\u00ean<\/strong>: Thay v\u00ec t\u1ea1o k\u1ebft n\u1ed1i m\u1edbi cho m\u1ed7i y\u00eau c\u1ea7u, Keepalive s\u1eed d\u1ee5ng l\u1ea1i c\u00e1c k\u1ebft n\u1ed1i hi\u1ec7n c\u00f3, t\u1ed1i \u01b0u h\u00f3a vi\u1ec7c s\u1eed d\u1ee5ng t\u00e0i nguy\u00ean \u1edf ph\u00eda m\u00e1y ch\u1ee7 v\u00e0 gi\u1ea3m t\u1ea3i tr\u00ean m\u1ea1ng.<\/p>\n<\/li>\n<li>\n<p><strong>T\u1eaft m\u00e1y duy\u00ean d\u00e1ng<\/strong>: Keepalive t\u1ea1o \u0111i\u1ec1u ki\u1ec7n thu\u1eadn l\u1ee3i cho vi\u1ec7c t\u1eaft m\u00e1y m\u1ed9t c\u00e1ch nh\u1eb9 nh\u00e0ng b\u1eb1ng c\u00e1ch \u0111\u1ea3m b\u1ea3o t\u1ea5t c\u1ea3 d\u1eef li\u1ec7u \u0111ang ch\u1edd x\u1eed l\u00fd \u0111\u01b0\u1ee3c truy\u1ec1n \u0111i tr\u01b0\u1edbc khi \u0111\u00f3ng k\u1ebft n\u1ed1i.<\/p>\n<\/li>\n<li>\n<p><strong>C\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t<\/strong>: Giao ti\u1ebfp li\u00ean t\u1ee5c gi\u1eefa m\u00e1y kh\u00e1ch v\u00e0 m\u00e1y ch\u1ee7 cho ph\u00e9p truy\u1ec1n d\u1eef li\u1ec7u theo th\u1eddi gian th\u1ef1c v\u00e0 mang l\u1ea1i hi\u1ec7u su\u1ea5t t\u1ed1t h\u01a1n cho c\u00e1c \u1ee9ng d\u1ee5ng y\u00eau c\u1ea7u t\u01b0\u01a1ng t\u00e1c c\u00f3 \u0111\u1ed9 tr\u1ec5 th\u1ea5p.<\/p>\n<\/li>\n<\/ol>\n<h2>C\u00e1c lo\u1ea1i Keepalive<\/h2>\n<p>C\u00e1c c\u01a1 ch\u1ebf duy tr\u00ec c\u00f3 th\u1ec3 kh\u00e1c nhau t\u00f9y theo giao th\u1ee9c v\u00e0 c\u00e1ch tri\u1ec3n khai m\u1ea1ng. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 lo\u1ea1i Keepalive ph\u1ed5 bi\u1ebfn:<\/p>\n<table>\n<thead>\n<tr>\n<th>Ki\u1ec3u<\/th>\n<th>S\u1ef1 mi\u00eau t\u1ea3<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>TCP \u0111\u01b0\u1ee3c duy tr\u00ec<\/td>\n<td>\u0110\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c k\u1ebft n\u1ed1i TCP \u0111\u1ec3 ph\u00e1t hi\u1ec7n c\u00e1c \u0111\u1ed3ng nghi\u1ec7p kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng ho\u1eb7c \u0111\u00e3 ch\u1ebft<\/td>\n<\/tr>\n<tr>\n<td>L\u01b0u gi\u1eef HTTP<\/td>\n<td>T\u00e1i s\u1eed d\u1ee5ng c\u00e1c k\u1ebft n\u1ed1i TCP cho nhi\u1ec1u y\u00eau c\u1ea7u HTTP<\/td>\n<\/tr>\n<tr>\n<td>WebSocket \u0111\u01b0\u1ee3c l\u01b0u gi\u1eef<\/td>\n<td>\u0110\u1ea3m b\u1ea3o k\u1ebft n\u1ed1i WebSocket v\u1eabn ho\u1ea1t \u0111\u1ed9ng<\/td>\n<\/tr>\n<tr>\n<td>SSL\/TLS duy tr\u00ec<\/td>\n<td>Duy tr\u00ec k\u1ebft n\u1ed1i SSL\/TLS cho c\u00e1c phi\u00ean an to\u00e0n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>C\u00e1ch s\u1eed d\u1ee5ng Keepalive, 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>Keepalive \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i trong nhi\u1ec1u t\u00ecnh hu\u1ed1ng kh\u00e1c nhau:<\/p>\n<ol>\n<li>\n<p><strong>M\u00e1y ch\u1ee7 web<\/strong>: C\u00e1c m\u00e1y ch\u1ee7 web th\u01b0\u1eddng s\u1eed d\u1ee5ng HTTP Keepalive \u0111\u1ec3 ph\u1ee5c v\u1ee5 nhi\u1ec1u y\u00eau c\u1ea7u HTTP tr\u00ean c\u00f9ng m\u1ed9t k\u1ebft n\u1ed1i TCP, gi\u00fap gi\u1ea3m th\u1eddi gian ph\u1ea3n h\u1ed3i cho c\u00e1c y\u00eau c\u1ea7u ti\u1ebfp theo.<\/p>\n<\/li>\n<li>\n<p><strong>M\u00e1y ch\u1ee7 proxy<\/strong>: C\u00e1c nh\u00e0 cung c\u1ea5p m\u00e1y ch\u1ee7 proxy, nh\u01b0 OneProxy (oneproxy.pro), c\u00f3 th\u1ec3 tri\u1ec3n khai Keepalive \u0111\u1ec3 n\u00e2ng cao t\u00ednh b\u1ec1n v\u1eefng c\u1ee7a k\u1ebft n\u1ed1i v\u00e0 t\u1ed1i \u01b0u h\u00f3a vi\u1ec7c s\u1eed d\u1ee5ng t\u00e0i nguy\u00ean cho kh\u00e1ch h\u00e0ng c\u1ee7a h\u1ecd.<\/p>\n<\/li>\n<li>\n<p><strong>\u1ee8ng d\u1ee5ng th\u1eddi gian th\u1ef1c<\/strong>: Keepalive r\u1ea5t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng th\u1eddi gian th\u1ef1c, ch\u1eb3ng h\u1ea1n nh\u01b0 ch\u01a1i tr\u00f2 ch\u01a1i tr\u1ef1c tuy\u1ebfn v\u00e0 truy\u1ec1n ph\u00e1t video, trong \u0111\u00f3 \u0111\u1ed9 tr\u1ec5 th\u1ea5p v\u00e0 k\u1ebft n\u1ed1i li\u00ean t\u1ee5c l\u00e0 \u0111i\u1ec1u quan tr\u1ecdng nh\u1ea5t.<\/p>\n<\/li>\n<li>\n<p><strong>C\u00e2n b\u1eb1ng t\u1ea3i<\/strong>: B\u1ed9 c\u00e2n b\u1eb1ng t\u1ea3i c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng Keepalive \u0111\u1ec3 theo d\u00f5i t\u00ecnh tr\u1ea1ng m\u00e1y ch\u1ee7 ph\u1ee5 tr\u1ee3 v\u00e0 ph\u00e2n ph\u1ed1i l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3.<\/p>\n<\/li>\n<\/ol>\n<p>M\u1eb7c d\u00f9 c\u00f3 nh\u1eefng \u01b0u \u0111i\u1ec3m nh\u01b0ng vi\u1ec7c s\u1eed d\u1ee5ng Keepalive c\u00f3 th\u1ec3 g\u1eb7p ph\u1ea3i m\u1ed9t s\u1ed1 th\u00e1ch th\u1ee9c:<\/p>\n<ol>\n<li>\n<p><strong>Chi ph\u00ed t\u00e0i nguy\u00ean<\/strong>: C\u00e1c g\u00f3i Keepalive th\u01b0\u1eddng xuy\u00ean c\u00f3 th\u1ec3 t\u1ea1o th\u00eam l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp m\u1ea1ng v\u00e0 ti\u00eau t\u1ed1n t\u00e0i nguy\u00ean m\u00e1y ch\u1ee7. C\u1ea7n ph\u1ea3i \u0111i\u1ec1u ch\u1ec9nh \u0111\u00fang kho\u1ea3ng th\u1eddi gian Keepalive \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c s\u1ef1 c\u00e2n b\u1eb1ng gi\u1eefa kh\u1ea3 n\u0103ng ph\u1ea3n h\u1ed3i v\u00e0 m\u1ee9c s\u1eed d\u1ee5ng t\u00e0i nguy\u00ean.<\/p>\n<\/li>\n<li>\n<p><strong>C\u1ea5u h\u00ecnh t\u01b0\u1eddng l\u1eeda<\/strong>: T\u01b0\u1eddng l\u1eeda ho\u1eb7c thi\u1ebft b\u1ecb m\u1ea1ng b\u1ecb \u0111\u1ecbnh c\u1ea5u h\u00ecnh sai c\u00f3 th\u1ec3 ch\u1eb7n ho\u1eb7c lo\u1ea1i b\u1ecf c\u00e1c g\u00f3i Keepalive, d\u1eabn \u0111\u1ebfn gi\u00e1n \u0111o\u1ea1n k\u1ebft n\u1ed1i.<\/p>\n<\/li>\n<li>\n<p><strong>K\u1ebft n\u1ed1i m\u1ed3 c\u00f4i<\/strong>: Trong m\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p nh\u1ea5t \u0111\u1ecbnh, Keepalive c\u00f3 th\u1ec3 kh\u00f4ng ph\u00e1t hi\u1ec7n ch\u00ednh x\u00e1c l\u1ed7i k\u1ebft n\u1ed1i, d\u1eabn \u0111\u1ebfn k\u1ebft n\u1ed1i \u0111\u01a1n l\u1ebb. C\u00e0i \u0111\u1eb7t th\u1eddi gian ch\u1edd n\u00ean \u0111\u01b0\u1ee3c \u0111i\u1ec1u ch\u1ec9nh cho ph\u00f9 h\u1ee3p.<\/p>\n<\/li>\n<\/ol>\n<p>\u0110\u1ec3 gi\u1ea3i quy\u1ebft nh\u1eefng v\u1ea5n \u0111\u1ec1 n\u00e0y, qu\u1ea3n tr\u1ecb vi\u00ean n\u00ean tinh ch\u1ec9nh c\u00e0i \u0111\u1eb7t Keepalive, ti\u1ebfn h\u00e0nh gi\u00e1m s\u00e1t m\u1ea1ng th\u01b0\u1eddng xuy\u00ean v\u00e0 \u0111\u1ea3m b\u1ea3o kh\u1ea3 n\u0103ng t\u01b0\u01a1ng th\u00edch v\u1edbi t\u1ea5t c\u1ea3 c\u00e1c thi\u1ebft b\u1ecb m\u1ea1ng c\u00f3 li\u00ean quan.<\/p>\n<h2>C\u00e1c \u0111\u1eb7c \u0111i\u1ec3m ch\u00ednh v\u00e0 c\u00e1c so s\u00e1nh kh\u00e1c v\u1edbi c\u00e1c thu\u1eadt ng\u1eef t\u01b0\u01a1ng t\u1ef1 d\u01b0\u1edbi d\u1ea1ng b\u1ea3ng v\u00e0 danh s\u00e1ch.<\/h2>\n<p>D\u01b0\u1edbi \u0111\u00e2y l\u00e0 so s\u00e1nh Keepalive v\u1edbi c\u00e1c thu\u1eadt ng\u1eef t\u01b0\u01a1ng t\u1ef1 v\u00e0 c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m ch\u00ednh c\u1ee7a ch\u00fang:<\/p>\n<table>\n<thead>\n<tr>\n<th>Thu\u1eadt ng\u1eef<\/th>\n<th>C\u00e1c \u0111\u1eb7c \u0111i\u1ec3m ch\u00ednh<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>C\u1ed1 s\u1ed1ng \u0111i<\/td>\n<td>\u0110\u1ea3m b\u1ea3o k\u1ebft n\u1ed1i b\u1ec1n v\u1eefng v\u00e0 ph\u00e1t hi\u1ec7n l\u1ed7i<\/td>\n<\/tr>\n<tr>\n<td>Nh\u1ecbp tim<\/td>\n<td>T\u00edn hi\u1ec7u \u0111\u1ecbnh k\u1ef3 \u0111\u1ec3 bi\u1ec3u th\u1ecb s\u1ef1 s\u1ed1ng \u0111\u1ed9ng ho\u1eb7c s\u1ef1 hi\u1ec7n di\u1ec7n<\/td>\n<\/tr>\n<tr>\n<td>H\u1ebft gi\u1edd<\/td>\n<td>Kho\u1ea3ng th\u1eddi gian ch\u1edd \u0111\u1ee3i tr\u01b0\u1edbc khi coi l\u00e0 k\u1ebft n\u1ed1i \u0111\u00e3 ch\u1ebft<\/td>\n<\/tr>\n<tr>\n<td>B\u1ecf phi\u1ebfu<\/td>\n<td>Th\u01b0\u1eddng xuy\u00ean ki\u1ec3m tra c\u00e1c b\u1ea3n c\u1eadp nh\u1eadt ho\u1eb7c thay \u0111\u1ed5i<\/td>\n<\/tr>\n<tr>\n<td>C\u00e2n b\u1eb1ng t\u1ea3i<\/td>\n<td>Ph\u00e2n ph\u1ed1i l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp tr\u00ean nhi\u1ec1u m\u00e1y ch\u1ee7<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Quan \u0111i\u1ec3m v\u00e0 c\u00f4ng ngh\u1ec7 c\u1ee7a t\u01b0\u01a1ng lai li\u00ean quan \u0111\u1ebfn Keepalive.<\/h2>\n<p>T\u01b0\u01a1ng lai c\u1ee7a Keepalive xoay quanh vi\u1ec7c t\u1ed1i \u01b0u h\u00f3a h\u01a1n n\u1eefa hi\u1ec7u su\u1ea5t m\u1ea1ng v\u00e0 th\u1eddi gian ph\u1ea3n h\u1ed3i:<\/p>\n<ol>\n<li>\n<p><strong>Th\u1ee7 t\u1ee5c th\u00edch \u1ee9ng<\/strong>: C\u00e1c thu\u1eadt to\u00e1n d\u1ef1a tr\u00ean AI c\u00f3 th\u1ec3 t\u1ef1 \u0111\u1ed9ng \u0111i\u1ec1u ch\u1ec9nh c\u00e1c kho\u1ea3ng th\u1eddi gian Keepalive d\u1ef1a tr\u00ean \u0111i\u1ec1u ki\u1ec7n m\u1ea1ng v\u00e0 ho\u1ea1t \u0111\u1ed9ng c\u1ee7a kh\u00e1ch h\u00e0ng, \u0111\u1ea3m b\u1ea3o hi\u1ec7u su\u1ea5t t\u1ed1i \u01b0u.<\/p>\n<\/li>\n<li>\n<p><strong>Tri\u1ec3n khai IPv6<\/strong>: Khi vi\u1ec7c \u00e1p d\u1ee5ng IPv6 ng\u00e0y c\u00e0ng ph\u00e1t tri\u1ec3n, c\u00e1c c\u01a1 ch\u1ebf Keepalive s\u1ebd ph\u00e1t tri\u1ec3n \u0111\u1ec3 h\u1ed7 tr\u1ee3 giao th\u1ee9c m\u1edbi m\u1ed9t c\u00e1ch li\u1ec1n m\u1ea1ch.<\/p>\n<\/li>\n<li>\n<p><strong>\u0110i\u1ec7n to\u00e1n bi\u00ean<\/strong>: Keepalive s\u1ebd \u0111\u00f3ng m\u1ed9t vai tr\u00f2 quan tr\u1ecdng trong m\u00f4i tr\u01b0\u1eddng \u0111i\u1ec7n to\u00e1n bi\u00ean, \u0111\u1ea3m b\u1ea3o k\u1ebft n\u1ed1i kh\u00f4ng b\u1ecb gi\u00e1n \u0111o\u1ea1n gi\u1eefa c\u00e1c thi\u1ebft b\u1ecb bi\u00ean v\u00e0 m\u00e1y ch\u1ee7 trung t\u00e2m.<\/p>\n<\/li>\n<\/ol>\n<h2>C\u00e1ch s\u1eed d\u1ee5ng ho\u1eb7c li\u00ean k\u1ebft m\u00e1y ch\u1ee7 proxy v\u1edbi Keepalive.<\/h2>\n<p>C\u00e1c m\u00e1y ch\u1ee7 proxy, nh\u01b0 OneProxy (oneproxy.pro), c\u00f3 th\u1ec3 t\u1eadn d\u1ee5ng Keepalive \u0111\u1ec3 n\u00e2ng cao vi\u1ec7c cung c\u1ea5p d\u1ecbch v\u1ee5 c\u1ee7a h\u1ecd:<\/p>\n<ol>\n<li>\n<p><strong>K\u1ebft n\u1ed1i li\u00ean t\u1ee5c<\/strong>: M\u00e1y ch\u1ee7 proxy c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng Keepalive \u0111\u1ec3 duy tr\u00ec k\u1ebft n\u1ed1i li\u00ean t\u1ee5c v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng kh\u00e1ch, gi\u1ea3m chi ph\u00ed thi\u1ebft l\u1eadp k\u1ebft n\u1ed1i.<\/p>\n<\/li>\n<li>\n<p><strong>C\u00e2n b\u1eb1ng t\u1ea3i<\/strong>: Keepalive h\u1ed7 tr\u1ee3 c\u00e1c m\u00e1y ch\u1ee7 proxy theo d\u00f5i t\u00ecnh tr\u1ea1ng m\u00e1y ch\u1ee7 ph\u1ee5 tr\u1ee3 v\u00e0 ph\u00e2n ph\u1ed1i hi\u1ec7u qu\u1ea3 c\u00e1c y\u00eau c\u1ea7u c\u1ee7a kh\u00e1ch h\u00e0ng.<\/p>\n<\/li>\n<li>\n<p><strong>Dung sai l\u1ed7i<\/strong>: B\u1eb1ng c\u00e1ch ch\u1ee7 \u0111\u1ed9ng ph\u00e1t hi\u1ec7n c\u00e1c m\u00e1y kh\u00e1ch kh\u00f4ng ph\u1ea3n h\u1ed3i, Keepalive gi\u00fap c\u00e1c m\u00e1y ch\u1ee7 proxy \u0111\u1ea3m b\u1ea3o t\u00ednh s\u1eb5n s\u00e0ng cao v\u00e0 kh\u1ea3 n\u0103ng ch\u1ecbu l\u1ed7i.<\/p>\n<\/li>\n<li>\n<p><strong>T\u1ed1i \u01b0u h\u00f3a t\u00e0i nguy\u00ean<\/strong>: M\u00e1y ch\u1ee7 proxy c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng l\u1ea1i c\u00e1c k\u1ebft n\u1ed1i hi\u1ec7n c\u00f3 b\u1eb1ng Keepalive, b\u1ea3o t\u1ed3n t\u00e0i nguy\u00ean m\u00e1y ch\u1ee7 v\u00e0 c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t t\u1ed5ng th\u1ec3.<\/p>\n<\/li>\n<\/ol>\n<h2>Li\u00ean k\u1ebft li\u00ean quan<\/h2>\n<p>\u0110\u1ec3 bi\u1ebft th\u00eam th\u00f4ng tin v\u1ec1 Keepalive, b\u1ea1n c\u00f3 th\u1ec3 tham kh\u1ea3o c\u00e1c t\u00e0i nguy\u00ean sau:<\/p>\n<ol>\n<li><a href=\"https:\/\/tools.ietf.org\/html\/rfc1122\" target=\"_new\" rel=\"noopener nofollow\">RFC 1122 \u2013 Y\u00eau c\u1ea7u \u0111\u1ed1i v\u1edbi m\u00e1y ch\u1ee7 Internet<\/a><\/li>\n<li><a href=\"https:\/\/www.keycdn.com\/support\/http-keep-alive\" target=\"_new\" rel=\"noopener nofollow\">Hi\u1ec3u HTTP Keep-Alive v\u00e0 k\u1ebft n\u1ed1i t\u1ed5ng h\u1ee3p<\/a><\/li>\n<li><a href=\"https:\/\/stackoverflow.com\/questions\/32590375\/websocket-keep-alive-strategies\" target=\"_new\" rel=\"noopener nofollow\">Chi\u1ebfn l\u01b0\u1ee3c duy tr\u00ec WebSocket<\/a><\/li>\n<\/ol>","protected":false},"featured_media":477760,"menu_order":0,"template":"","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"class_list":["post-477759","wiki","type-wiki","status-publish","has-post-thumbnail","hentry"],"acf":{"faq_title":"Frequently Asked Questions about <mark>Keepalive: Ensuring Proxy Server Stability and Performance<\/mark>","faq_items":[{"question":"What is Keepalive and why is it important for proxy servers?","answer":"<p>Keepalive is a crucial mechanism that ensures the stability and performance of connections between clients and servers, including proxy servers. It works by maintaining continuous and persistent connections, reducing latency, and preventing premature connection drops. For proxy servers like OneProxy (oneproxy.pro), Keepalive plays a vital role in optimizing resource utilization, enhancing fault tolerance, and providing a seamless browsing experience for users.<\/p>"},{"question":"How did the concept of Keepalive originate?","answer":"<p>The concept of Keepalive dates back to the early days of the Internet when TCP was introduced in the 1970s. The first mention of Keepalive can be traced to RFC 1122, published in 1989, which standardized the TCP protocol and introduced the idea of sending periodic packets to maintain connections. Keepalive was born out of the need to address idle or dead connections that could lead to disruptions in network communication.<\/p>"},{"question":"How does Keepalive work internally?","answer":"<p>Keepalive operates using three main components: a Keepalive timer, a Keepalive packet, and a Keepalive response. The timer is set on the server-side to determine the interval at which Keepalive packets are sent to clients. These packets are lightweight messages sent by the server to the client to check if it is still responsive. The client must respond with an acknowledgment or an updated status, confirming its active connection.<\/p>"},{"question":"What are the key features of Keepalive?","answer":"<p>Keepalive offers several essential features, including connection persistence, fault detection, resource optimization, graceful shutdowns, and improved application performance. By maintaining persistent connections and actively monitoring clients, Keepalive ensures that the network remains responsive and efficient.<\/p>"},{"question":"What are the different types of Keepalive?","answer":"<p>Keepalive mechanisms vary based on the network protocol and implementation. Some common types include TCP Keepalive, HTTP Keepalive, WebSocket Keepalive, and SSL\/TLS Keepalive. Each type serves specific purposes in different networking technologies.<\/p>"},{"question":"How is Keepalive used, and what challenges may arise?","answer":"<p>Keepalive finds application in web servers, proxy servers, real-time applications, and load balancers. However, improper configuration and network issues may lead to resource overhead, firewall blockages, or orphaned connections. Proper tuning of Keepalive settings and regular network monitoring are essential to overcome these challenges.<\/p>"},{"question":"How does Keepalive compare to similar terms like Heartbeat and Timeout?","answer":"<p>Keepalive serves as a connection persistence mechanism, while Heartbeat is a periodic signal indicating liveliness. Timeout refers to the duration to wait before considering a connection dead. Keepalive can complement these concepts by actively maintaining connections and detecting unresponsive clients.<\/p>"},{"question":"What does the future hold for Keepalive?","answer":"<p>The future of Keepalive lies in adaptive implementations, IPv6 support, and its role in edge computing environments. AI-based algorithms may dynamically adjust Keepalive intervals, while IPv6 compatibility will become increasingly important with growing adoption. Additionally, Keepalive will play a crucial role in maintaining connections in edge computing scenarios.<\/p>"},{"question":"How do proxy servers benefit from Keepalive?","answer":"<p>Proxy servers like OneProxy (oneproxy.pro) leverage Keepalive to maintain persistent connections with clients, optimize resource utilization, and provide fault tolerance. By actively detecting unresponsive clients and reusing existing connections, proxy servers can enhance their service offerings and improve overall performance for users.<\/p>"}]},"_links":{"self":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/477759","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\/477759\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media\/477760"}],"wp:attachment":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media?parent=477759"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}