{"id":21458,"date":"2024-01-02T09:43:26","date_gmt":"2024-01-02T09:43:26","guid":{"rendered":"https:\/\/server.hk\/blog\/21458\/"},"modified":"2024-11-14T10:33:59","modified_gmt":"2024-11-14T02:33:59","slug":"how-to-fix-postgresql-error-code-57p03-cannot_connect_now","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/21458\/","title":{"rendered":"\u5982\u4f55\u4fee\u5fa9 PostgreSQL \u932f\u8aa4\u4ee3\u78bc\uff1a57P03 &#8211; cannot_connect_now"},"content":{"rendered":"<h1 id=\"how-to-fix-postgresql-error-code-57p03-cannot_connect_now-JABeZDbJtL\">\u5982\u4f55\u4fee\u5fa9 PostgreSQL \u932f\u8aa4\u4ee3\u78bc\uff1a57P03 &#8211; cannot_connect_now<\/h1>\n<p>PostgreSQL \u662f\u4e00\u500b\u529f\u80fd\u5f37\u5927\u7684\u958b\u6e90\u95dc\u806f\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u5ee3\u6cdb\u61c9\u7528\u65bc\u5168\u7403\u7684\u4f01\u696d\u548c\u7d44\u7e54\u3002\u7136\u800c\uff0c\u50cf\u6240\u6709\u8edf\u4ef6\u4e00\u6a23\uff0cPostgreSQL \u4e5f\u53ef\u80fd\u6703\u9047\u5230\u932f\u8aa4\uff0c\u9019\u4e9b\u932f\u8aa4\u53ef\u80fd\u6703\u5e72\u64fe\u5176\u6b63\u5e38\u904b\u884c\u3002\u5176\u4e2d\u4e00\u500b\u932f\u8aa4\u662f PostgreSQL \u932f\u8aa4\u4ee3\u78bc\uff1a57P03 &#8211; cannot_connect_now\u3002\u5728\u672c\u6587\u4e2d\uff0c\u6211\u5011\u5c07\u63a2\u8a0e\u6b64\u932f\u8aa4\u7684\u539f\u56e0\uff0c\u4e26\u63d0\u4f9b\u9010\u6b65\u7684\u4fee\u5fa9\u6307\u5c0e\u3002<\/p>\n<h2 id=\"understanding-the-error-JABeZDbJtL\">\u7406\u89e3\u932f\u8aa4<\/h2>\n<p>PostgreSQL \u932f\u8aa4\u4ee3\u78bc\uff1a57P03 &#8211; cannot_connect_now \u767c\u751f\u5728\u5ba2\u6236\u7aef\u61c9\u7528\u7a0b\u5e8f\u5617\u8a66\u9023\u63a5\u5230 PostgreSQL \u6578\u64da\u5eab\u4f46\u56e0\u9054\u5230\u9023\u63a5\u9650\u5236\u800c\u5931\u6557\u6642\u3002\u9019\u500b\u932f\u8aa4\u901a\u5e38\u8868\u793a PostgreSQL \u4f3a\u670d\u5668\u5141\u8a31\u7684\u6700\u5927\u9023\u63a5\u6578\u5df2\u9054\u5230\uff0c\u4e26\u4e14\u76ee\u524d\u7121\u6cd5\u5efa\u7acb\u65b0\u7684\u9023\u63a5\u3002<\/p>\n<h2 id=\"possible-causes-JABeZDbJtL\">\u53ef\u80fd\u7684\u539f\u56e0<\/h2>\n<p>\u9019\u500b\u932f\u8aa4\u53ef\u80fd\u6709\u5e7e\u500b\u6f5b\u5728\u539f\u56e0\uff1a<\/p>\n<ul>\n<li><strong>\u8cc7\u6e90\u4e0d\u8db3\uff1a<\/strong>\u5982\u679c\u627f\u8f09 PostgreSQL \u6578\u64da\u5eab\u7684\u4f3a\u670d\u5668\u8cc7\u6e90\u4e0d\u8db3\uff08\u4f8b\u5982 CPU\u3001\u5167\u5b58\u6216\u78c1\u789f\u7a7a\u9593\uff09\uff0c\u5247\u53ef\u80fd\u7121\u6cd5\u8655\u7406\u984d\u5916\u7684\u9023\u63a5\u3002<\/li>\n<li><strong>\u9023\u63a5\u6d29\u6f0f\uff1a<\/strong>\u5982\u679c\u5ba2\u6236\u7aef\u61c9\u7528\u7a0b\u5e8f\u672a\u6b63\u78ba\u95dc\u9589\u8207 PostgreSQL \u6578\u64da\u5eab\u7684\u9023\u63a5\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u9023\u63a5\u6d29\u6f0f\uff0c\u6700\u7d42\u8017\u76e1\u53ef\u7528\u7684\u9023\u63a5\u3002<\/li>\n<li><strong>\u9ad8\u6d41\u91cf\uff1a<\/strong>\u5982\u679c PostgreSQL \u4f3a\u670d\u5668\u6b63\u5728\u7d93\u6b77\u5927\u91cf\u7684\u9032\u5165\u9023\u63a5\uff0c\u5247\u53ef\u80fd\u6703\u8fc5\u901f\u9054\u5230\u5176\u9023\u63a5\u9650\u5236\u3002<\/li>\n<\/ul>\n<h2 id=\"fixing-the-error-JABeZDbJtL\">\u4fee\u5fa9\u932f\u8aa4<\/h2>\n<p>\u8981\u89e3\u6c7a PostgreSQL \u932f\u8aa4\u4ee3\u78bc\uff1a57P03 &#8211; cannot_connect_now\uff0c\u8acb\u6309\u7167\u4ee5\u4e0b\u6b65\u9a5f\u9032\u884c\uff1a<\/p>\n<h3 id=\"step-1-identify-the-cause-JABeZDbJtL\">\u6b65\u9a5f 1\uff1a\u8b58\u5225\u539f\u56e0<\/h3>\n<p>\u9996\u5148\uff0c\u78ba\u5b9a\u932f\u8aa4\u7684\u539f\u56e0\u3002\u6aa2\u67e5\u4f3a\u670d\u5668\u7684\u8cc7\u6e90\u4f7f\u7528\u60c5\u6cc1\uff0c\u5305\u62ec CPU\u3001\u5167\u5b58\u548c\u78c1\u789f\u7a7a\u9593\uff0c\u4ee5\u78ba\u4fdd\u5b83\u6709\u8db3\u5920\u7684\u8cc7\u6e90\u4f86\u8655\u7406\u65b0\u7684\u9023\u63a5\u3002\u6b64\u5916\uff0c\u8abf\u67e5\u5ba2\u6236\u7aef\u61c9\u7528\u7a0b\u5e8f\u4e2d\u7684\u4efb\u4f55\u6f5b\u5728\u9023\u63a5\u6d29\u6f0f\u4e26\u76f8\u61c9\u8655\u7406\u3002\u5982\u679c\u932f\u8aa4\u662f\u7531\u65bc\u9ad8\u6d41\u91cf\u9020\u6210\u7684\uff0c\u8003\u616e\u5be6\u65bd\u9023\u63a5\u6c60\u6216\u8ca0\u8f09\u5747\u8861\uff0c\u4ee5\u5c07\u8ca0\u8f09\u5206\u914d\u5230\u591a\u500b\u4f3a\u670d\u5668\u3002<\/p>\n<h3 id=\"step-2-adjust-connection-settings-JABeZDbJtL\">\u6b65\u9a5f 2\uff1a\u8abf\u6574\u9023\u63a5\u8a2d\u7f6e<\/h3>\n<p>\u5982\u679c\u932f\u8aa4\u7684\u539f\u56e0\u8207 PostgreSQL \u4f3a\u670d\u5668\u5141\u8a31\u7684\u6700\u5927\u9023\u63a5\u6578\u6709\u95dc\uff0c\u60a8\u53ef\u4ee5\u8abf\u6574\u9023\u63a5\u8a2d\u7f6e\u4ee5\u589e\u52a0\u9650\u5236\u3002\u6253\u958b PostgreSQL \u914d\u7f6e\u6587\u4ef6\uff08\u901a\u5e38\u540d\u70ba postgresql.conf\uff09\uff0c\u4e26\u627e\u5230 <code>max_connections<\/code> \u53c3\u6578\u3002\u589e\u52a0\u5176\u503c\u4ee5\u5141\u8a31\u66f4\u591a\u7684\u9023\u63a5\u3002\u7136\u800c\uff0c\u8acb\u5c0f\u5fc3\u4e0d\u8981\u8a2d\u7f6e\u5f97\u904e\u9ad8\uff0c\u56e0\u70ba\u9019\u53ef\u80fd\u6703\u5f71\u97ff\u4f3a\u670d\u5668\u7684\u6027\u80fd\u3002<\/p>\n<h3 id=\"step-3-restart-postgresql-JABeZDbJtL\">\u6b65\u9a5f 3\uff1a\u91cd\u555f PostgreSQL<\/h3>\n<p>\u5728\u8abf\u6574\u9023\u63a5\u8a2d\u7f6e\u5f8c\uff0c\u91cd\u555f PostgreSQL \u4f3a\u670d\u5668\u4ee5\u61c9\u7528\u66f4\u6539\u3002\u9019\u901a\u5e38\u53ef\u4ee5\u4f7f\u7528\u547d\u4ee4 <code>sudo service postgresql restart<\/code> \u6216 <code>sudo systemctl restart postgresql<\/code> \u4f86\u5b8c\u6210\uff0c\u5177\u9ad4\u53d6\u6c7a\u65bc\u60a8\u7684\u64cd\u4f5c\u7cfb\u7d71\u3002<\/p>\n<h3 id=\"step-4-test-the-connection-JABeZDbJtL\">\u6b65\u9a5f 4\uff1a\u6e2c\u8a66\u9023\u63a5<\/h3>\n<p>\u4f3a\u670d\u5668\u91cd\u555f\u5f8c\uff0c\u6e2c\u8a66\u9023\u63a5\u4ee5\u78ba\u4fdd PostgreSQL \u932f\u8aa4\u4ee3\u78bc\uff1a57P03 &#8211; cannot_connect_now \u4e0d\u518d\u767c\u751f\u3002\u5617\u8a66\u4f7f\u7528\u5ba2\u6236\u7aef\u61c9\u7528\u7a0b\u5e8f\u9023\u63a5\u5230\u6578\u64da\u5eab\u6216\u904b\u884c\u7c21\u55ae\u67e5\u8a62\u3002\u5982\u679c\u9023\u63a5\u6210\u529f\uff0c\u5247\u8868\u793a\u932f\u8aa4\u5df2\u89e3\u6c7a\u3002<\/p>\n<h2 id=\"summary-JABeZDbJtL\">\u7e3d\u7d50<\/h2>\n<p>\u7e3d\u4e4b\uff0cPostgreSQL \u932f\u8aa4\u4ee3\u78bc\uff1a57P03 &#8211; cannot_connect_now \u53ef\u80fd\u7531\u591a\u7a2e\u56e0\u7d20\u5f15\u8d77\uff0c\u4f8b\u5982\u8cc7\u6e90\u4e0d\u8db3\u3001\u9023\u63a5\u6d29\u6f0f\u6216\u9ad8\u6d41\u91cf\u3002\u8981\u4fee\u5fa9\u6b64\u932f\u8aa4\uff0c\u91cd\u8981\u7684\u662f\u8b58\u5225\u539f\u56e0\u4e26\u63a1\u53d6\u9069\u7576\u7684\u884c\u52d5\uff0c\u4f8b\u5982\u8abf\u6574\u9023\u63a5\u8a2d\u7f6e\u548c\u91cd\u555f PostgreSQL \u4f3a\u670d\u5668\u3002\u901a\u904e\u9075\u5faa\u9019\u4e9b\u6b65\u9a5f\uff0c\u60a8\u53ef\u4ee5\u89e3\u6c7a\u932f\u8aa4\u4e26\u78ba\u4fdd PostgreSQL \u6578\u64da\u5eab\u7684\u9806\u5229\u904b\u884c\u3002<\/p>\n<p>\u5982\u9700\u6709\u95dc VPS \u8a17\u7ba1\u53ca\u5176\u5982\u4f55\u70ba\u60a8\u7684\u696d\u52d9\u5e36\u4f86\u76ca\u8655\u7684\u66f4\u591a\u4fe1\u606f\uff0c\u8acb\u8a2a\u554f <a href=\"https:\/\/server.hk\">Server.HK<\/a>\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5982\u4f55\u4fee\u5fa9 PostgreSQL &#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-21458","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/21458","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=21458"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/21458\/revisions"}],"predecessor-version":[{"id":24020,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/21458\/revisions\/24020"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=21458"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=21458"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=21458"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}