# PM2 当前使用场景：产品环境守护进程。 ## 常用命令 ### 启动项目 ```bash pm2 start xxx.js #直接启动入口文件 pm2 start xxx.json #通过配置启动 ``` 配置文件参考： ```json [{ "name": "app", "script": "babel.js", "log_date_format": "YYYY-MM-DD HH:mm:ss Z", "cwd": "/home/project", "error_file": "/home/project/logs/app.err.log", "out_file": "/home/project/logs/app.out.log", "max_memory_restart": "800M", "instances": 0, "exec_mode": "cluster", "merge_logs": true, "env": { "NODE_ENV": "production" } },{ "script" : "./examples/child.js", "error_file" : "errLog.log", "out_file" : "outLog.log", "pid_file" : "child", "instances" : "4", "min_uptime" : "10", "max_restarts" : "4" },{ "script" : "examples/env.js", "error_file" : "errEcho.log", "out_file" : "outEcho.log", "name" : "ok", "pid_file" : "echo.pid", "max" : "1", "exec_mode" : "cluster_mode", "port" : "9001", "env_variable" : "TOTO", "TEST_VARIABLE" : "YESSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSIR" }] ``` ### 重启项目 ```bash pm2 restart #PID# #重启一个进程 pm2 restart app-name #重启一个应用 pm2 restart all #重启所有项目 ``` ### 停止 ```bash pm2 stop #PID# pm2 stop app-name ``` ### 终止 ```bash pm2 delete app-name #删除一个进程 pm2 kill #终止所有进程 ``` ### 开机自启 ```bash pm2 startup ``` 参考官方文档获取详细使用说明。 ## 自动重启 设置内存使用过高上限，可以通过配置文件这一项： ```js { "max_memory_restart": "800M" } ``` `PM2`是一个很好的工具，提供了`max-memory-restart`内存溢出重启的功能。 但美中不足的是，没有CPU限制重启的功能。 同时，也无法进行远程手动重启。但好在，PM2提供了JSON格式列表输出，让我们可以自己去写一些守护进程，或者整合到已有的运维管理系统中。 ```bash pm2 jlist ``` 结果会是这样的json： ```json [ { "pid": 28701, "name": "xxxx", "pm2_env": { "name": "xxxx", "max_memory_restart": 838860800, "instances": 0, "cwd": "/xxxx/project", "merge_logs": true, "vizion": true, "pmx": true, "automation": true, "autorestart": true, "treekill": true, "env": { "PM2_JSON_PROCESSING": "true", "LSCOLORS": "Gxfxcxdxbxegedabagacad", "LESS": "-R", "PAGER": "less", "SSH_TTY": "/dev/pts/1", "SSH_CLIENT": "218.94.29.190 53115 22", "SHELL": "/bin/bash", "TERM": "xterm-256color", "XDG_SESSION_ID": "814", "NODE_ENV": "production", "max_memory_restart": 838860800, "instances": 0, "merge_logs": true, "vizion": true, "pmx": true, "automation": true, "autorestart": true, "treekill": true, "log_date_format": "YYYY-MM-DD HH:mm:ss Z", "exec_mode": "cluster_mode", "node_args": [], "exec_interpreter": "node", "pm_out_log_path": "/xxxxx/logs/fish.out.log", "pm_err_log_path": "/xxxxx/logs/fish.err.log" }, "log_date_format": "YYYY-MM-DD HH:mm:ss Z", "exec_mode": "cluster_mode", "node_args": [], "pm_exec_path": "/xxxx/babel.js", "pm_cwd": "/xxxxx/project", "exec_interpreter": "node", "pm_out_log_path": "/xxxxxx/xxx.out.log", "pm_err_log_path": "/xxxxxx/xxx.err.log", "NODE_APP_INSTANCE": 0, "vizion_running": false, "PM2_JSON_PROCESSING": "true", "LESSCLOSE": "/usr/bin/lesspipe %s %s", "XDG_RUNTIME_DIR": "/run/user/1000", "LESSOPEN": "| /usr/bin/lesspipe %s", "LC_CTYPE": "zh_CN.UTF-8", "SSH_TTY": "/dev/pts/1", "SHELL": "/bin/bash", "NODE_ENV": "production", "fish": "{}", "status": "online", "pm_uptime": 1472561001434, "axm_actions": [], "axm_monitor": { "Loop delay": { "value": "0.92ms", "agg_type": "avg", "alert": {} } }, "axm_options": { "http": false, "http_latency": 200, "http_code": 500, "ignore_routes": [], "profiling": true, "errors": true, "alert_enabled": true, "custom_probes": true, "network": false, "ports": false, "module_conf": {}, "module_name": "fish", "module_version": "1.1.3", "pmx_version": "0.6.2", "error": true }, "axm_dynamic": {}, "created_at": 1472561000966, "pm_id": 3, "restart_time": 1, "unstable_restarts": 0, "_pm2_version": "1.1.3", "versioning": { "type": "git", "update_time": "2016-09-02T07:25:14.113Z", "comment": "v3.6.12 - fix-importer", "unstaged": false, "branch": "HEAD", "remotes": [ "origin" ], "remote": "origin", "branch_exists_on_remote": true, "ahead": false, "next_rev": null }, "node_version": "6.3.0", "exit_code": 0 }, "pm_id": 3, "monit": { "memory": 90591232, "cpu": 0 } } ] ``` 其中每一列数据都有 `rows[i].monit.cpu`，值范围 0~100。可以用`later`写定时脚本监控并重启。 示例代码： ```js import { exec } from 'child_process'; import numeral from 'numeral'; exec('pm2 jlist', (err, stdout, stderr) => { if (stderr) { console.log(stderr); } const result = stdout.split('\n'); // 如果不存在 PM2 进程，将会打初始化日志 while (result[0].indexOf('[PM2]') === 0) { result.shift(); } let items = []; try { items = JSON.parse(result[0]); } catch (e) { /* eslint no-empty:0 */ } // console.log(items); // 演示 const item = items[0]; const uptimeTmp = numeral((new Date() - item.pm2_env.pm_uptime) / 1000).format('00:00:00').split(':').map(Number); const uptime = `${parseInt(uptimeTmp[0] / 24, 10)}天${uptimeTmp[0] % 24}时${uptimeTmp[1]}分${uptimeTmp[2]}秒`.replace('0天', '').replace('0时', '').replace('0分', '').replace('0秒', ''); console.log(item.pid); // 41965 console.log(item.name); // app-name console.log(item.pm_id); // 0 console.log(`${item.monit.cpu}%`); // 91% console.log(numeral(item.monit.memory).format('0.0b')); // 126.8MB console.log(uptime); // 6秒 console.log(item.pm2_env.restart_time); // 0 if (item.monit.cpu > 90) { exec(`pm2 restart ${item.pm_id}`, (err2, stdout2, stderr2) => { console.log(stdout2); console.log(stderr2); }); } }); ```