{"id":2495,"date":"2026-03-11T18:53:41","date_gmt":"2026-03-11T10:53:41","guid":{"rendered":"https:\/\/www.madbull.site\/?p=2495"},"modified":"2026-03-11T18:53:41","modified_gmt":"2026-03-11T10:53:41","slug":"journalctl%e4%bb%8b%e7%bb%8d","status":"publish","type":"post","link":"https:\/\/www.madbull.site\/?p=2495","title":{"rendered":"journalctl\u4ecb\u7ecd"},"content":{"rendered":"\n<p><code>journalctl<\/code> \u662f systemd \u7684\u65e5\u5fd7\u67e5\u770b\u5de5\u5177\uff0c\u7528\u4e8e\u67e5\u8be2\u548c\u663e\u793a systemd \u6536\u96c6\u7684\u4e8c\u8fdb\u5236\u65e5\u5fd7\uff08journal\uff09\u3002\u5b83\u96c6\u4e2d\u7ba1\u7406\u5185\u6838\u3001\u670d\u52a1\u3001\u5e94\u7528\u7a0b\u5e8f\u7b49\u8f93\u51fa\u7684\u65e5\u5fd7\u4fe1\u606f\uff0c\u662f Linux \u7cfb\u7edf\u65e5\u5fd7\u5206\u6790\u7684\u6838\u5fc3\u547d\u4ee4\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u5e38\u7528\u529f\u80fd<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. \u67e5\u770b\u6240\u6709\u65e5\u5fd7<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>journalctl<\/code><\/pre>\n\n\n\n<p>\u9ed8\u8ba4\u663e\u793a\u6240\u6709\u65e5\u5fd7\uff08\u53ef\u80fd\u91cf\u5f88\u5927\uff09\uff0c\u6309\u65f6\u95f4\u987a\u5e8f\u4ece\u65e7\u5230\u65b0\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2. \u67e5\u770b\u672c\u6b21\u542f\u52a8\u4ee5\u6765\u7684\u65e5\u5fd7<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>journalctl -b\n# \u6216\u6307\u5b9a\u542f\u52a8\u5e8f\u53f7\uff08\u5982\u4e0a\u4e00\u6b21\u542f\u52a8\uff09\njournalctl -b -1<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">3. \u5b9e\u65f6\u8ddf\u8e2a\u65e5\u5fd7\uff08\u7c7b\u4f3c tail -f\uff09<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>journalctl -f<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">4. \u67e5\u770b\u6307\u5b9a\u5355\u5143\u7684\u65e5\u5fd7<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>journalctl -u nginx.service      # \u670d\u52a1\u5355\u5143\njournalctl -u ssh.socket          # socket \u5355\u5143\njournalctl -u user-1000.slice     # slice \u5355\u5143<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">5. \u6309\u65f6\u95f4\u8fc7\u6ee4<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>journalctl --since \"2025-03-01\"\njournalctl --until \"2025-03-10 15:30:00\"\njournalctl --since yesterday\njournalctl --since \"1 hour ago\"<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">6. \u6309\u4f18\u5148\u7ea7\/\u7ea7\u522b\u8fc7\u6ee4<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>journalctl -p err          # \u53ea\u663e\u793a\u9519\u8bef\u53ca\u4ee5\u4e0a\u7ea7\u522b\njournalctl -p warning -p notice  # \u663e\u793a warning \u548c notice<\/code><\/pre>\n\n\n\n<p>\u7ea7\u522b\uff1aemerg, alert, crit, err, warning, notice, info, debug<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">7. \u67e5\u770b\u5185\u6838\u65e5\u5fd7<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>journalctl -k<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">8. \u6839\u636e\u7279\u5b9a\u5b57\u6bb5\u8fc7\u6ee4<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>journalctl _PID=1234          # \u6307\u5b9a\u8fdb\u7a0b\njournalctl _UID=1000           # \u6307\u5b9a\u7528\u6237\njournalctl _COMM=sshd          # \u6307\u5b9a\u547d\u4ee4\u540d\njournalctl _SYSTEMD_UNIT=nginx.service<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">9. \u63a7\u5236\u8f93\u51fa\u683c\u5f0f<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>journalctl -o verbose          # \u663e\u793a\u6240\u6709\u5b57\u6bb5\njournalctl -o json              # JSON \u683c\u5f0f\njournalctl -o json-pretty       # \u6613\u8bfb\u7684 JSON\njournalctl -o short-full        # \u6807\u51c6\u683c\u5f0f\uff08\u542b\u65f6\u95f4\u6233\uff09<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">10. \u67e5\u770b\u65e5\u5fd7\u5360\u7528\u7684\u78c1\u76d8\u7a7a\u95f4<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>journalctl --disk-usage<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">11. \u7ef4\u62a4\u548c\u6e05\u7406\u65e5\u5fd7<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>journalctl --vacuum-size=200M        # \u4fdd\u7559\u6700\u8fd1 200M \u65e5\u5fd7\uff0c\u5220\u9664\u65e7\u7684\njournalctl --vacuum-time=2weeks      # \u4fdd\u7559\u6700\u8fd1 2 \u5468\njournalctl --vacuum-files=5           # \u53ea\u4fdd\u7559 5 \u4e2a\u65e5\u5fd7\u6587\u4ef6<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">12. \u67e5\u770b\u6700\u540e n \u884c<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>journalctl -n 50<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">13. \u663e\u793a\u65e5\u5fd7\u5c3e\u90e8\u5e76\u6301\u7eed\u8ddf\u8e2a\uff08\u7ec4\u5408\uff09<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>journalctl -u nginx.service -f -n 10<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u5c0f\u8d34\u58eb<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>journalctl \u9ed8\u8ba4\u663e\u793a\u5f53\u524d\u7528\u6237\u7684\u53ef\u89c1\u65e5\u5fd7\uff08\u7cfb\u7edf\u65e5\u5fd7\u9700 root \u6743\u9650\uff09\u3002<\/li>\n\n\n\n<li>\u65e5\u5fd7\u662f\u7ed3\u6784\u5316\u7684\uff0c\u652f\u6301\u4e30\u5bcc\u7684\u8fc7\u6ee4\u6761\u4ef6\uff0c\u901a\u8fc7 <code>journalctl -o verbose<\/code> \u53ef\u67e5\u770b\u6240\u6709\u53ef\u7528\u7684\u5b57\u6bb5\u540d\u3002<\/li>\n\n\n\n<li>\u4f7f\u7528 <code>man journalctl<\/code> \u67e5\u770b\u5b8c\u6574\u6587\u6863\u3002<\/li>\n<\/ul>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>journalctl \u662f systemd \u7684\u65e5\u5fd7\u67e5\u770b\u5de5\u5177\uff0c\u7528\u4e8e\u67e5\u8be2\u548c\u663e\u793a systemd \u6536\u96c6\u7684\u4e8c\u8fdb\u5236\u65e5\u5fd7\uff08j [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":450,"comment_status":"open","ping_status":"open","sticky":false,"template":"wp-custom-template-my","format":"standard","meta":{"footnotes":""},"categories":[135,131],"tags":[720,237],"class_list":["post-2495","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-linux","category-131","tag-journalctl","tag-linux"],"_links":{"self":[{"href":"https:\/\/www.madbull.site\/index.php?rest_route=\/wp\/v2\/posts\/2495","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.madbull.site\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.madbull.site\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.madbull.site\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.madbull.site\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2495"}],"version-history":[{"count":1,"href":"https:\/\/www.madbull.site\/index.php?rest_route=\/wp\/v2\/posts\/2495\/revisions"}],"predecessor-version":[{"id":2496,"href":"https:\/\/www.madbull.site\/index.php?rest_route=\/wp\/v2\/posts\/2495\/revisions\/2496"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.madbull.site\/index.php?rest_route=\/wp\/v2\/media\/450"}],"wp:attachment":[{"href":"https:\/\/www.madbull.site\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2495"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.madbull.site\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2495"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.madbull.site\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2495"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}