{"id":209308,"date":"2025-09-30T08:12:19","date_gmt":"2025-09-30T00:12:19","guid":{"rendered":"https:\/\/www.server.hk\/blog\/209308\/"},"modified":"2025-09-30T08:12:20","modified_gmt":"2025-09-30T00:12:20","slug":"vps-systemd","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/209308\/","title":{"rendered":"\u9999\u6e2fVPS Systemd \u6df1\u5ea6\u4f18\u5316\uff1a\u8ba9\u8fdb\u7a0b\u66f4\u7a33\u5b9a\u3001\u66f4\u9ad8\u6548"},"content":{"rendered":"<p>\u5728\u6258\u7ba1\u4e1a\u52a1\u5feb\u901f\u53d1\u5c55\u7684\u4eca\u5929\uff0cVPS \u5728\u7f51\u7ad9\u8fd0\u7ef4\u3001\u5e94\u7528\u90e8\u7f72\u4e0e\u6301\u7eed\u96c6\u6210\u573a\u666f\u4e2d\u626e\u6f14\u7740\u91cd\u8981\u89d2\u8272\u3002\u5bf9\u4e8e\u5728\u9999\u6e2f\u673a\u623f\u90e8\u7f72\u7684\u865a\u62df\u79c1\u6709\u670d\u52a1\u5668\uff08\u9999\u6e2fVPS\uff09\uff0c\u5408\u7406\u5229\u7528 systemd \u7684\u9ad8\u7ea7\u7279\u6027\u80fd\u663e\u8457\u63d0\u5347\u8fdb\u7a0b\u7a33\u5b9a\u6027\u4e0e\u8d44\u6e90\u5229\u7528\u6548\u7387\u3002\u672c\u6587\u9762\u5411\u7ad9\u957f\u3001\u4f01\u4e1a\u7528\u6237\u4e0e\u5f00\u53d1\u8005\uff0c\u6df1\u5165\u8bb2\u89e3\u5982\u4f55\u5bf9 systemd \u8fdb\u884c\u6df1\u5ea6\u4f18\u5316\uff0c\u7ed3\u5408\u5b9e\u9645\u914d\u7f6e\u4e0e\u539f\u7406\u8bf4\u660e\uff0c\u5e2e\u52a9\u4f60\u5728\u9999\u6e2f\u670d\u52a1\u5668\u6216\u8de8\u5883\u90e8\u7f72\uff08\u5982\u7f8e\u56fdVPS\u3001\u7f8e\u56fd\u670d\u52a1\u5668\uff09\u65f6\u5b9e\u73b0\u66f4\u53ef\u9760\u7684\u670d\u52a1\u8fd0\u884c\u3002<\/p>\n<h2>\u5f15\u8a00\uff1a\u4e3a\u4ec0\u4e48\u5728 VPS \u4e0a\u4f18\u5316 systemd \u5f88\u91cd\u8981<\/h2>\n<p>systemd \u5df2\u6210\u4e3a\u591a\u6570 Linux \u53d1\u884c\u7248\u7684 init \u7cfb\u7edf\uff0c\u8d1f\u8d23\u8fdb\u7a0b\u542f\u52a8\u3001\u8d44\u6e90\u7ba1\u7406\u4e0e\u65e5\u5fd7\u6536\u96c6\u3002\u5728 VPS \u73af\u5883\u4e0b\uff0c\u5c24\u5176\u662f\u8d44\u6e90\u6709\u9650\u6216\u591a\u79df\u6237\u573a\u666f\uff08\u5982\u9999\u6e2fVPS\uff09\uff0c\u5bf9 systemd \u505a\u6709\u9488\u5bf9\u6027\u7684\u4f18\u5316\u53ef\u4ee5\u5e26\u6765\u4ee5\u4e0b\u597d\u5904\uff1a<\/p>\n<ul>\n<li>\u63d0\u9ad8\u670d\u52a1\u53ef\u7528\u6027\uff0c\u51cf\u5c11\u56e0\u8d44\u6e90\u77ed\u7f3a\u6216\u5f02\u5e38\u9000\u51fa\u5bfc\u81f4\u7684\u5b95\u673a\u3002<\/li>\n<li>\u66f4\u7cbe\u7ec6\u7684\u8d44\u6e90\u9650\u5236\u4e0e\u914d\u989d\uff0c\u907f\u514d\u5355\u4e00\u8fdb\u7a0b\u6324\u5360\u5bbf\u4e3b\u673a\u8d44\u6e90\u3002<\/li>\n<li>\u6539\u8fdb\u65e5\u5fd7\u7ba1\u7406\u4e0e\u6545\u969c\u5b9a\u4f4d\u6548\u7387\uff0c\u7f29\u77ed\u6062\u590d\u65f6\u95f4\u3002<\/li>\n<li>\u63d0\u5347\u5b89\u5168\u6027\uff0c\u9650\u5236\u4e0d\u5fc5\u8981\u7684\u6743\u9650\u4e0e\u7cfb\u7edf\u8bbf\u95ee\u9762\u3002<\/li>\n<\/ul>\n<h2>systemd \u539f\u7406\u4e0e\u5173\u952e\u7ec4\u4ef6\u56de\u987e<\/h2>\n<p>\u5728\u8fdb\u884c\u4f18\u5316\u4e4b\u524d\uff0c\u9700\u8981\u7406\u89e3\u51e0\u4e2a\u4e0e\u7a33\u5b9a\u6027\u548c\u6548\u7387\u5bc6\u5207\u76f8\u5173\u7684 systemd \u6982\u5ff5\uff1a<\/p>\n<ul>\n<li><strong>Unit \u6587\u4ef6\uff08.service\/.socket\/.slice\/.scope\uff09<\/strong>\uff1a\u5b9a\u4e49\u8fdb\u7a0b\u542f\u52a8\u65b9\u5f0f\u3001\u4f9d\u8d56\u5173\u7cfb\u4e0e\u8d44\u6e90\u9650\u5236\u3002<\/li>\n<li><strong>Cgroups\uff08\u63a7\u5236\u7ec4\uff09<\/strong>\uff1a\u7528\u4e8e\u5bf9\u8fdb\u7a0b\u8fdb\u884c\u7cbe\u7ec6\u7684 CPU\u3001\u5185\u5b58\u3001IO \u9650\u5236\u4e0e\u7edf\u8ba1\u3002<\/li>\n<li><strong>journald<\/strong>\uff1a\u7cfb\u7edf\u65e5\u5fd7\u5b88\u62a4\u8fdb\u7a0b\uff0c\u8d1f\u8d23\u6536\u96c6\u4e0e\u5b58\u50a8\u65e5\u5fd7\uff0c\u652f\u6301\u6301\u4e45\u5316\u4e0e\u538b\u7f29\u3002<\/li>\n<li><strong>Timers<\/strong>\uff1a\u66ff\u4ee3\u4f20\u7edf cron \u7684\u673a\u5236\uff0c\u53ef\u7cbe\u786e\u63a7\u5236\u5468\u671f\u6027\u4efb\u52a1\u7684\u89e6\u53d1\u3002<\/li>\n<li><strong>Slices\/Scopes<\/strong>\uff1a\u7528\u4e8e\u5bf9\u8fdb\u7a0b\u96c6\u5408\u8fdb\u884c\u5206\u7ec4\u4e0e\u8d44\u6e90\u5206\u914d\uff08\u4f8b\u5982\u628a Web \u670d\u52a1\u4e0e\u6570\u636e\u5e93\u9694\u79bb\uff09\u3002<\/li>\n<\/ul>\n<h2>\u9762\u5411\u9999\u6e2fVPS \u7684 systemd \u6df1\u5ea6\u4f18\u5316\u7b56\u7565<\/h2>\n<h3>1. \u4f18\u5316\u5355\u5143\u6587\u4ef6\uff08Unit\uff09\u4ee5\u5b9e\u73b0\u66f4\u7a33\u5b9a\u7684\u542f\u52a8\u4e0e\u91cd\u542f\u7b56\u7565<\/h3>\n<p>\u5408\u7406\u914d\u7f6e Unit \u6587\u4ef6\u53ef\u4ee5\u8ba9\u670d\u52a1\u5728\u9047\u5230\u77ed\u6682\u9519\u8bef\u65f6\u81ea\u52a8\u6062\u590d\uff0c\u540c\u65f6\u907f\u514d\u65e0\u9650\u91cd\u542f\u5bfc\u81f4\u7684\u8d44\u6e90\u6d6a\u8d39\u3002\u5efa\u8bae\u914d\u7f6e\u5982\u4e0b\u5173\u952e\u9879\uff1a<\/p>\n<ul>\n<li><strong>Restart<\/strong>\uff1a\u5efa\u8bae\u8bbe\u7f6e\u4e3a on-failure \u6216 always\uff0c\u7ed3\u5408 RestartSec \u63a7\u5236\u91cd\u542f\u95f4\u9694\uff0c\u907f\u514d\u5feb\u901f\u91cd\u8bd5\uff08thundering restart\uff09\u3002<\/li>\n<li><strong>StartLimitBurst \/ StartLimitIntervalSec<\/strong>\uff1a\u9650\u5236\u5355\u4f4d\u65f6\u95f4\u5185\u7684\u91cd\u542f\u6b21\u6570\uff0c\u9632\u6b62\u91cd\u542f\u98ce\u66b4\u3002<\/li>\n<li><strong>Type<\/strong>\uff1a\u5bf9\u4e8e\u666e\u901a\u5b88\u62a4\u8fdb\u7a0b\u4f7f\u7528 simple\uff0c\u5bf9\u4e8e fork \u7684\u5b88\u62a4\u8fdb\u7a0b\u4f7f\u7528 forking\uff1bType=dbus \u7b49\u7528\u4e8e\u7279\u6b8a\u573a\u666f\u3002<\/li>\n<\/ul>\n<p>\u793a\u4f8b unit \u7247\u6bb5\uff1a<\/p>\n<p>&lt;Unit&gt;<br \/>\nDescription=example service<br \/>\nAfter=network.target<br \/>\n&lt;\/Unit&gt;<br \/>\n&lt;Service&gt;<br \/>\nType=simple<br \/>\nExecStart=\/usr\/bin\/myapp &#8211;serve<br \/>\nRestart=on-failure<br \/>\nRestartSec=10s<br \/>\nStartLimitBurst=5<br \/>\nStartLimitIntervalSec=60s<br \/>\n&lt;\/Service&gt;<br \/>\n&lt;Install&gt;<br \/>\nWantedBy=multi-user.target<br \/>\n&lt;\/Install&gt;<\/p>\n<h3>2. \u901a\u8fc7 cgroups \u548c Slice \u5b9e\u73b0\u8d44\u6e90\u9694\u79bb\u4e0e\u914d\u989d\u63a7\u5236<\/h3>\n<p>\u5728\u9999\u6e2f\u670d\u52a1\u5668\u4e0a\uff0c\u5c24\u5176\u662f\u90e8\u7f72\u591a\u4e2a\u7f51\u7ad9\u6216\u670d\u52a1\u65f6\uff0c\u4f7f\u7528 systemd \u7684 cgroup \u652f\u6301\u53ef\u4ee5\u6709\u6548\u5206\u914d CPU\u3001\u5185\u5b58\u4e0e IO\u3002\u5173\u952e\u53c2\u6570\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>CPUQuota<\/strong>\uff1a\u9650\u5236\u670d\u52a1\u53ef\u5360\u7528\u7684 CPU \u767e\u5206\u6bd4\uff08\u4f8b\u5982 CPUQuota=50%\uff09\u3002<\/li>\n<li><strong>MemoryAccounting \/ MemoryLimit<\/strong>\uff1a\u542f\u7528\u5185\u5b58\u4f1a\u8ba1\u5e76\u8bbe\u7f6e\u5185\u5b58\u4e0a\u9650\uff0c\u9632\u6b62 OOM \u5bfc\u81f4\u5168\u673a\u4e0d\u7a33\u5b9a\u3002<\/li>\n<li><strong>IOWeight \/ BlockIODevice<\/strong>\uff1a\u63a7\u5236\u78c1\u76d8 IO \u6743\u91cd\uff0c\u5173\u952e\u5bf9\u4e8e\u6570\u636e\u5e93\u6216\u65e5\u5fd7\u5bc6\u96c6\u578b\u5e94\u7528\u3002<\/li>\n<\/ul>\n<p>\u793a\u4f8b\uff1a<\/p>\n<p>&lt;Service&gt;<br \/>\nCPUQuota=60%<br \/>\nMemoryAccounting=yes<br \/>\nMemoryMax=1G<br \/>\nIOWeight=300<br \/>\n&lt;\/Service&gt;<\/p>\n<h3>3. \u5229\u7528 systemd \u7684\u5b89\u5168\u7279\u6027\u51cf\u5c11\u653b\u51fb\u9762<\/h3>\n<p>systemd \u63d0\u4f9b\u5927\u91cf\u5b89\u5168\u76f8\u5173\u9009\u9879\uff0c\u53ef\u4ee5\u5728\u4e0d\u6539\u53d8\u5e94\u7528\u4ee3\u7801\u7684\u60c5\u51b5\u4e0b\u663e\u8457\u63d0\u5347\u8fdb\u7a0b\u9694\u79bb\uff1a<\/p>\n<ul>\n<li><strong>PrivateTmp=yes<\/strong>\uff1a\u5206\u914d\u79c1\u6709 \/tmp\uff0c\u9632\u6b62\u4e0d\u540c\u670d\u52a1\u4e92\u76f8\u5f71\u54cd\u3002<\/li>\n<li><strong>ProtectSystem=full<\/strong>\uff1a\u5c06\u6839\u6587\u4ef6\u7cfb\u7edf\u7f6e\u4e3a\u53ea\u8bfb\uff08\u9664 \/etc \/var \/run\uff09\uff0c\u964d\u4f4e\u88ab\u7be1\u6539\u98ce\u9669\u3002<\/li>\n<li><strong>NoNewPrivileges=yes<\/strong>\uff1a\u7981\u6b62\u7ee7\u627f\u65b0\u7684\u6743\u9650\uff08\u4f8b\u5982 setuid\uff09\u3002<\/li>\n<li><strong>CapabilityBoundingSet=<\/strong>\uff1a\u9650\u5236\u8fdb\u7a0b\u53ef\u7528\u7684 Linux \u80fd\u529b\u96c6\u5408\uff0c\u53bb\u6389 CAP_SYS_ADMIN \u7b49\u9ad8\u98ce\u9669\u6743\u9650\u3002<\/li>\n<\/ul>\n<p>\u8fd9\u4e9b\u8bbe\u7f6e\u5bf9\u5728\u9999\u6e2fVPS \u6216\u7f8e\u56fdVPS \u4e0a\u8fd0\u884c\u7684\u516c\u5f00\u670d\u52a1\u7279\u522b\u91cd\u8981\uff0c\u53ef\u51cf\u5c11\u88ab\u5229\u7528\u7684\u653b\u51fb\u9762\uff0c\u4ece\u800c\u63d0\u5347\u7a33\u5b9a\u6027\u3002<\/p>\n<h3>4. \u65e5\u5fd7\u7ba1\u7406\uff1ajournald \u4e0e\u65e5\u5fd7\u8f6e\u8f6c<\/h3>\n<p>journald \u9ed8\u8ba4\u4f1a\u5c06\u65e5\u5fd7\u5b58\u50a8\u5728\u5185\u5b58\u4e2d\uff08volatile\uff09\uff0c\u8fd9\u5728\u957f\u65f6\u95f4\u8fd0\u884c\u6216\u65e5\u5fd7\u91cf\u5927\u7684\u670d\u52a1\u4e0a\u4f1a\u8017\u5c3d\u5185\u5b58\u3002\u4f18\u5316\u5efa\u8bae\uff1a<\/p>\n<ul>\n<li>\u5c06 \/var\/log\/journal \u8bbe\u7f6e\u4e3a\u6301\u4e45\u5316\u5b58\u50a8\uff08Storage=persistent\uff09\uff0c\u5e76\u7ed3\u5408 SystemMaxUse\/RuntimeMaxUse \u9650\u5236\u78c1\u76d8\u5360\u7528\u3002<\/li>\n<li>\u5bf9\u4e8e\u9ad8\u541e\u5410\u91cf\u65e5\u5fd7\u7684\u670d\u52a1\uff0c\u8003\u8651\u5c06\u5173\u952e\u65e5\u5fd7\u8f93\u51fa\u5230\u6587\u4ef6\uff0c\u5e76\u4f7f\u7528 logrotate \u6216 rsyslog\/Fluentd \u8f6c\u53d1\u5230\u96c6\u4e2d\u5f0f\u65e5\u5fd7\u7cfb\u7edf\u3002<\/li>\n<li>\u542f\u7528 RateLimitInterval\/RateLimitBurst \u4ee5\u907f\u514d\u65e5\u5fd7\u98ce\u66b4\u5bfc\u81f4 I\/O \u5cf0\u503c\u3002<\/li>\n<\/ul>\n<h3>5. \u76d1\u63a7\u4e0e\u81ea\u52a8\u6062\u590d\uff1aWatchdog\u3001HealthCheck \u4e0e OnFailure<\/h3>\n<p>systemd \u652f\u6301\u786c\u4ef6\u6216\u7528\u6237\u7a7a\u95f4\u7684 watchdog\uff0c\u53ef\u5728\u670d\u52a1\u65e0\u54cd\u5e94\u65f6\u89e6\u53d1\u91cd\u542f\u6216\u66f4\u4e0a\u5c42\u7684\u4fee\u590d\u7b56\u7565\uff1a<\/p>\n<ul>\n<li><strong>WatchdogSec<\/strong>\uff1a\u5728 Unit \u4e2d\u914d\u7f6e\uff0c\u82e5\u670d\u52a1\u5728\u6307\u5b9a\u95f4\u9694\u5185\u672a\u5411 systemd \u5fc3\u8df3\uff0csystemd \u53ef\u91c7\u53d6\u91cd\u542f\u6216\u91cd\u542f\u5bbf\u4e3b\u7b56\u7565\u3002<\/li>\n<li>\u7ed3\u5408 <strong>OnFailure<\/strong> \u4e0e\u81ea\u5b9a\u4e49\u6062\u590d\u811a\u672c\uff0c\u53ef\u4ee5\u5b9e\u73b0\u62a5\u8b66\u3001\u6545\u969c\u8f6c\u50a8\u6536\u96c6\u3001\u6216\u89e6\u53d1\u66f4\u590d\u6742\u7684\u4fee\u590d\u6d41\u7a0b\u3002<\/li>\n<\/ul>\n<p>\u793a\u4f8b\uff1a<\/p>\n<p>&lt;Service&gt;<br \/>\nWatchdogSec=30s<br \/>\nExecStart=\/usr\/bin\/myapp &#8211;serve<br \/>\nExecStartPost=\/usr\/local\/bin\/notify-on-failure.sh<br \/>\nOnFailure=repair@%n.service<br \/>\n&lt;\/Service&gt;<\/p>\n<h3>6. \u4f7f\u7528 systemd-tmpfiles \u4e0e timers \u4f18\u5316\u5b9a\u671f\u7ef4\u62a4\u4efb\u52a1<\/h3>\n<p>systemd-tmpfiles \u6709\u52a9\u4e8e\u81ea\u52a8\u6e05\u7406\u4e34\u65f6\u6587\u4ef6\u3001\u9650\u5236\u65e5\u5fd7\u79ef\u7d2f\uff1btimers \u5219\u66ff\u4ee3 cron\uff0c\u5b9e\u73b0\u66f4\u7cbe\u786e\u7684\u4f9d\u8d56\u4e0e\u5e76\u884c\u63a7\u5236\uff1a<\/p>\n<ul>\n<li>\u914d\u7f6e \/etc\/tmpfiles.d\/*.conf \u7528\u4e8e\u6e05\u7406\u65e7\u65e5\u5fd7\u3001\u7f13\u5b58\u6587\u4ef6\u3002<\/li>\n<li>\u4f7f\u7528 .timer \u5355\u5143\u4ee3\u66ff cron\uff0c\u53ef\u5728\u670d\u52a1\u91cd\u542f\u540e\u4fdd\u6301 timer \u6301\u7eed\u6027\uff0c\u5e76\u4e0e service \u5355\u5143\u7d27\u5bc6\u5173\u8054\u3002<\/li>\n<\/ul>\n<h2>\u5b9e\u9645\u5e94\u7528\u573a\u666f\u4e0e\u6848\u4f8b\u5206\u6790<\/h2>\n<h3>\u573a\u666f\u4e00\uff1a\u591a\u7ad9\u70b9\u6258\u7ba1\u5728\u4e00\u53f0\u9999\u6e2fVPS<\/h3>\n<p>\u5047\u8bbe\u5728\u4e00\u4e2a\u4e2d\u7b49\u89c4\u683c\u9999\u6e2fVPS \u4e0a\u6258\u7ba1\u591a\u4e2a WordPress \u5b9e\u4f8b\uff08\u53ef\u80fd\u4e5f\u6d89\u53ca\u7f8e\u56fdVPS \u505a\u6d77\u5916\u955c\u50cf\uff09\u3002\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u65b9\u5f0f\u4fdd\u8bc1\u7a33\u5b9a\uff1a<\/p>\n<ul>\n<li>\u4e3a\u6bcf\u4e2a\u7ad9\u70b9\u7684 PHP-FPM\/Nginx \u521b\u5efa\u5355\u72ec\u7684 systemd service \u548c slice\uff0c\u8bbe\u7f6e MemoryMax \u548c CPUQuota\uff0c\u907f\u514d\u5355\u7ad9\u70b9\u8017\u5c3d\u8d44\u6e90\u3002<\/li>\n<li>\u4f7f\u7528 PrivateTmp\u3001ProtectHome \u7b49\u51cf\u5c11\u8d8a\u6743\u8bbf\u95ee\u98ce\u9669\u3002<\/li>\n<li>\u914d\u7f6e journald 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\u786e\u4fdd\u7f51\u7edc\u5c31\u7eea\u540e\u518d\u542f\u52a8\u4f9d\u8d56\u8fdc\u7aef\u670d\u52a1\u7684 Unit\u3002<\/li>\n<li>\u5c06 healthcheck \u4e0e OnFailure \u96c6\u6210\u5230\u81ea\u52a8\u6545\u969c\u5207\u6362\u673a\u5236\uff0c\u4ee5\u964d\u4f4e\u8de8\u533a\u6545\u969c\u5e26\u6765\u7684\u5f71\u54cd\u3002<\/li>\n<\/ul>\n<h2>\u4f18\u52bf\u5bf9\u6bd4\uff1a\u672a\u4f18\u5316 vs \u6df1\u5ea6\u4f18\u5316\u7684 systemd<\/h2>\n<p>\u4e0b\u9762\u5217\u51fa\u672a\u4f18\u5316\u548c\u6df1\u5ea6\u4f18\u5316\u5728\u5e38\u89c1\u6307\u6807\u4e0a\u7684\u5dee\u5f02\uff08\u6982\u62ec\uff09\uff1a<\/p>\n<ul>\n<li><strong>\u7a33\u5b9a\u6027<\/strong>\uff1a\u672a\u4f18\u5316\u7684\u670d\u52a1\u66f4\u5bb9\u6613\u56e0\u5185\u5b58\u6cc4\u6f0f\u6216\u77ed\u6682\u9519\u8bef\u5bfc\u81f4\u5168\u673a\u4e0d\u7a33\u5b9a\uff1b\u4f18\u5316\u540e\u80fd\u81ea\u52a8\u9694\u79bb\u5e76\u9650\u6d41\uff0c\u51cf\u5c11\u4e3b\u673a\u7ea7\u5b95\u673a\u3002<\/li>\n<li><strong>\u8d44\u6e90\u5229\u7528\u7387<\/strong>\uff1a\u4f18\u5316\u540e\u901a\u8fc7 cgroups \u4e0e slices \u7cbe\u51c6\u5206\u914d\uff0c\u63d0\u5347\u6574\u4f53\u541e\u5410\u4e0e\u591a\u79df\u6237\u5bb9\u91cf\u3002<\/li>\n<li><strong>\u5b89\u5168\u6027<\/strong>\uff1a\u542f\u7528 ProtectSystem\u3001CapabilityBoundingSet 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