nodejs pm2 环境入门
Jan082017
[摘要] 多年前订阅了 Nodejs 的邮件列表，通过邮件列表的频度看整个 Nodejs 的用户还是挺活跃的，最近想体验下 nodejs 究竟是何方神圣，所以对nodejs的环境进行了体验，这次使用的是 nodejs pm2 的组合。
（一）安装nodejs
系统环境为CentOS6.7，所以使用了yum安装
（1）安装nodejs
yum install nodejs npm –enablerepo=epel
（2）安装pm2
由于官方不建议直接使用node启动服务，比较了多种进程管理工具后选择了使用pm2来对nodejs进行管理和维护
pm2的安装很简单：
npm install pm2 -g
（二）使用pm2启动nodejs
（1）准备测试的hello.js文件
|
1 2 3 4 5 6 |
cat hello.js var http = require('http'); http.createServer(function (req, res) { res.writeHead(200, { 'Content-Type': 'text/plain' }); res.end('Hello Sudops.com \n'); }).listen(8081, "127.0.0.1"); console.log('Server running at http://127.0.0.1:8081/'); |
（2）使用pm2第一次运行nodejs
nodejs-pm2
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 |
[root@vm03 app]# pm2 start hello.js ------------- Looking for a complete monitoring and management tool for PM2? _ _ _ _ | | _____ _ _ _ __ ___ ___| |_ _ __(_) ___ ___ (_) ___ | |/ / _ \ | | | '_ ` _ \ / _ \ __| '__| |/ __/ __| | |/ _ \ | < __/ |_| | | | | | | __/ |_| | | | (__\__ \_| | (_) | |_|\_\___|\__, |_| |_| |_|\___|\__|_| |_|\___|___(_)_|\___/ |___/ Features - Real Time Dashboard - CPU/Memory monitoring - HTTP monitoring - Event notification - Custom value monitoring - Real Time log display Checkout https://keymetrics.io/ ------------- [PM2] Spawning PM2 daemon with pm2_home=/root/.pm2 [PM2] PM2 Successfully daemonized [PM2] Starting /root/nodejs/app/hello.js in fork_mode (1 instance) [PM2] Done. ┌──────────┬────┬──────┬───────┬────────┬─────────┬────────┬─────┬──────────┬──────────┐ │ App name │ id │ mode │ pid │ status │ restart │ uptime │ cpu │ mem │ watching │ ├──────────┼────┼──────┼───────┼────────┼─────────┼────────┼─────┼──────────┼──────────┤ │ hello │ 0 │ fork │ 32397 │ online │ 0 │ 0s │ 0% │ 3.8 MB │ disabled │ └──────────┴────┴──────┴───────┴────────┴─────────┴────────┴─────┴──────────┴──────────┘ Use `pm2 show <id|name>` to get more details about an app |
（3）pm2的一些命令
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 |
[root@vm03 app]# pm2 list ┌──────────┬────┬──────┬─────┬────────┬─────────┬────────┬─────┬───────────┬──────────┐ │ App name │ id │ mode │ pid │ status │ restart │ uptime │ cpu │ mem │ watching │ ├──────────┼────┼──────┼─────┼────────┼─────────┼────────┼─────┼───────────┼──────────┤ │ hello │ 0 │ fork │ 331 │ online │ 0 │ 4s │ 0% │ 13.6 MB │ disabled │ └──────────┴────┴──────┴─────┴────────┴─────────┴────────┴─────┴───────────┴──────────┘ Use `pm2 show <id|name>` to get more details about an app [root@vm03 app]# pm2 info 0 Describing process with id 0 - name hello ┌───────────────────┬───────────────────────────────────┐ │ status │ online │ │ name │ hello │ │ restarts │ 0 │ │ uptime │ 19s │ │ script path │ /root/nodejs/app/hello.js │ │ script args │ N/A │ │ error log path │ /root/.pm2/logs/hello-error-0.log │ │ out log path │ /root/.pm2/logs/hello-out-0.log │ │ pid path │ /root/.pm2/pids/hello-0.pid │ │ interpreter │ node │ │ interpreter args │ N/A │ │ script id │ 0 │ │ exec cwd │ /root/nodejs/app │ │ exec mode │ fork_mode │ │ node.js version │ 0.10.48 │ │ watch & reload │ ✘ │ │ unstable restarts │ 0 │ │ created at │ 2017-01-08T11:37:19.828Z │ └───────────────────┴───────────────────────────────────┘ Code metrics value ┌────────────┬────────┐ │ Loop delay │ 0.98ms │ └────────────┴────────┘ Add your own code metrics: http://bit.ly/code-metrics Use `pm2 logs hello [--lines 1000]` to display logs Use `pm2 monit` to monitor CPU and Memory usage hello [root@vm03 app]# pm2 monit ⌬ PM2 monitoring (To go further check out https://app.keymetrics.io) ⌬ PM2 monitoring (To go further check out https://app.keymetrics.io) ● hello [ ] 0 % [0] [fork_mode] [||| ] 16.941 MB |
（4）nodejs启动后的进程及端口
|
1 2 3 |
[root@vm03 app]# ps aux|egrep "node|pm2" root 323 0.0 0.3 732236 28732 ? Ssl 19:37 0:01 PM2 v2.2.3: God Daemon (/root/.pm2) root 331 0.0 0.2 728248 17368 ? Ssl 19:37 0:01 node /root/nodejs/app/hello.js |
（5）使用Nginx做反向代理
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 |
server { listen 80; server_name test.nodejstest001.com; access_log /appdir/logs/nodejs_access.log main; location / { proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_pass http://127.0.0.1:8081/; access_log /appdir/logs/nodejs_access.log; } error_page 404 /404.html; location = /40x.html { } error_page 500 502 503 504 /50x.html; location = /50x.html { } } |
（6）使用浏览器访问
nodejs-site
（7）pm2的一些命令
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 |
[root@vm03 app]# pm2 list ┌──────────┬────┬──────┬─────┬────────┬─────────┬────────┬─────┬───────────┬──────────┐ │ App name │ id │ mode │ pid │ status │ restart │ uptime │ cpu │ mem │ watching │ ├──────────┼────┼──────┼─────┼────────┼─────────┼────────┼─────┼───────────┼──────────┤ │ hello │ 0 │ fork │ 331 │ online │ 0 │ 4s │ 0% │ 13.6 MB │ disabled │ └──────────┴────┴──────┴─────┴────────┴─────────┴────────┴─────┴───────────┴──────────┘ Use `pm2 show <id|name>` to get more details about an app [root@vm03 app]# pm2 info 0 Describing process with id 0 - name hello ┌───────────────────┬───────────────────────────────────┐ │ status │ online │ │ name │ hello │ │ restarts │ 0 │ │ uptime │ 19s │ │ script path │ /root/nodejs/app/hello.js │ │ script args │ N/A │ │ error log path │ /root/.pm2/logs/hello-error-0.log │ │ out log path │ /root/.pm2/logs/hello-out-0.log │ │ pid path │ /root/.pm2/pids/hello-0.pid │ │ interpreter │ node │ │ interpreter args │ N/A │ │ script id │ 0 │ │ exec cwd │ /root/nodejs/app │ │ exec mode │ fork_mode │ │ node.js version │ 0.10.48 │ │ watch & reload │ ✘ │ │ unstable restarts │ 0 │ │ created at │ 2017-01-08T11:37:19.828Z │ └───────────────────┴───────────────────────────────────┘ Code metrics value ┌────────────┬────────┐ │ Loop delay │ 0.98ms │ └────────────┴────────┘ Add your own code metrics: http://bit.ly/code-metrics Use `pm2 logs hello [--lines 1000]` to display logs Use `pm2 monit` to monitor CPU and Memory usage hello [root@vm03 app]# pm2 monit ⌬ PM2 monitoring (To go further check out https://app.keymetrics.io) ⌬ PM2 monitoring (To go further check out https://app.keymetrics.io) ● hello [ ] 0 % [0] [fork_mode] [||| ] 16.941 MB |
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 |
Usage: pm2 [cmd] app Commands: start [options] <file|json|stdin|app_name|pm_id...> start and daemonize an app docker:gen [options] <file|config> generate Dockerfile in current folder docker:dev [options] <file|config> wrap application into Docker container docker:dist [options] <file|config> <image_name> wrap application into Docker container trigger <proc_name> <action_name> [params] deploy your json deploy <file|environment> deploy your json startOrRestart <json> start or restart JSON file startOrReload <json> start or gracefully reload JSON file startOrGracefulReload <json> start or gracefully reload JSON file stop [options] <id|name|all|json|stdin...> stop a process (to start it again, do pm2 restart <app>) restart [options] <id|name|all|json|stdin...> restart a process scale <app_name> <number> scale up/down a process in cluster mode depending on total_number param snapshot snapshot PM2 memory profile <command> profile CPU reload <name|all> reload processes (note that its for app using HTTP/HTTPS) gracefulReload <name|all> gracefully reload a process. Send a "shutdown" message to close all connections. id <name> get process id by name delete <name|id|script|all|json|stdin...> stop and delete a process from pm2 process list sendSignal <signal> <pm2_id|name> send a system signal to the target process ping ping pm2 daemon - if not up it will launch it updatePM2 update in-memory PM2 with local PM2 update (alias) update in-memory PM2 with local PM2 install|module:install <module|git:/> install or update a module and run it forever module:update <module|git:/> update a module and run it forever module:generate [app_name] Generate a sample module in current folder uninstall|module:uninstall <module> stop and uninstall a module publish|module:publish Publish the module you are currently on set <key> <value> sets the specified config <key> <value> multiset <value> multiset eg "key1 val1 key2 val2 get [key] get value for <key> conf [key] [value] get / set module config values config <key> [value] get / set module config values unset <key> clears the specified config <key> link|interact [secret_key|command] [public_key] [machine_name] linking action to keymetrics.io - command can be stop|info|delete|restart web launch a health API on 0.0.0.0:9615 dump|save dump all processes for resurrecting them later resurrect resurrect previously dumped processes unstartup [platform] disable and clear auto startup - [platform]=systemd,upstart,launchd,rcd startup [platform] setup script for pm2 at boot - [platform]=systemd,upstart,launchd,rcd logrotate copy default logrotate configuration generate generate an ecosystem.json configuration file ecosystem generate an ecosystem.json configuration file reset <name|id|all> reset counters for process describe <id> describe all parameters of a process id desc <id> (alias) describe all parameters of a process id info <id> (alias) describe all parameters of a process id show <id> (alias) describe all parameters of a process id list|ls [options] list all processes l (alias) list all processes status (alias) list all processes jlist list all processes in JSON format prettylist print json in a prettified JSON monit|m launch termcaps monitoring flush flush logs reloadLogs reload all logs logs [options] [id|name] stream logs file. Default stream all logs kill kill daemon pull <name> [commit_id] updates repository for a given app forward <name> updates repository to the next commit for a given app backward <name> downgrades repository to the previous commit for a given app gc force PM2 to trigger garbage collection deepUpdate performs a deep update of PM2 * Options: -h, --help output usage information -V, --version output the version number -v --version get version -s --silent hide all messages -m --mini-list display a compacted list without formatting -f --force force actions -n --name <name> set a <name> for script -i --instances <number> launch [number] instances (for networked app)(load balanced) -l --log [path] specify entire log file (error and out are both included) -o --output <path> specify out log file -e --error <path> specify error log file -p --pid <pid> specify pid file -k --kill-timeout <delay> delay before sending final SIGKILL signal to process --listen-timeout <delay> listen timeout on application reload --max-memory-restart <memory> specify max memory amount used to autorestart (in octet or use syntax like 100M) --restart-delay <delay> specify a delay between restarts (in milliseconds) --env <environment_name> specify environment to get specific env variables (for JSON declaration) -x --execute-command execute a program using fork system --max-restarts [count] only restart the script COUNT times -u --user <username> define user when generating startup script --hp <home path> define home path when generating startup script -c --cron <cron_pattern> restart a running process based on a cron pattern -w --write write configuration in local folder --interpreter <interpreter> the interpreter pm2 should use for executing app (bash, python...) --interpreter-args <arguments> interpret options (alias of --node-args) --log-date-format <momentjs format> add custom prefix timestamp to logs --no-daemon run pm2 daemon in the foreground if it doesn't exist already --update-env update environmnent on restart/reload --source-map-support force source map support --only <application-name> with json declaration, allow to only act on one application --disable-source-map-support force source map support --wait-ready ask pm2 to wait for ready event from your app --merge-logs merge logs from different instances but keep error and out separated --watch [paths] watch application folder for changes --ignore-watch <folders|files> folder/files to be ignored watching, chould be a specific name or regex - e.g. --ignore-watch="test node_modules "some scripts"" --node-args <node_args> space delimited arguments to pass to node in cluster mode - e.g. --node-args="--debug=7001 --trace-deprecation" --no-color skip colors --no-vizion start an app without vizion feature (versioning control) --no-autorestart start an app without automatic restart --no-treekill Only kill the main process, not detached children --no-pmx start an app without pmx --no-automation start an app without pmx Basic Examples: Start an app using all CPUs available + set a name : $ pm2 start app.js -i 0 --name "api" Restart the previous app launched, by name : $ pm2 restart api Stop the app : $ pm2 stop api Restart the app that is stopped : $ pm2 restart api Remove the app from the process list : $ pm2 delete api Kill daemon pm2 : $ pm2 kill Update pm2 : $ npm install pm2@latest -g ; pm2 update More examples in https://github.com/Unitech/pm2#usagefeatures Deployment help: $ pm2 deploy help |
跟docker的结合
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 |
[root@vm03 app]# pm2 docker:gen hello.Dockerfile New Dockerfile generated in current folder You can now run $ pm2 docker:dev <file|config> [root@vm03 app]# cat Dockerfile FROM mhart/alpine-node:latest RUN apk update && apk add git && rm -rf /var/cache/apk/* RUN npm install pm2@next -g RUN mkdir -p /var/app WORKDIR /var/app COPY ./package.json /var/app RUN npm install ## DEVELOPMENT MODE ENV NODE_ENV=development CMD ["rundev", "start", "--auto-exit", "hello.Dockerfile", "--env", "development"] |
（三）NodeJS的热度
（四）NodeJS小结
整体感觉NodeJS简单易用，非常轻量级，适合熟悉js的前、后端开发者，使用pm2管理方便可靠，加上Nginx一层的反向代理增加了web层面的可用性，只是目前还不清楚NodeJS还有哪些坑，作为爱折腾的你来说值得一试！
nodejs pm2 环境入门：等您坐沙发呢！
发表评论
欢迎关注 运维·速度 微信公众号
