# 配置淘宝镜像源
npm config set registry https://registry.npm.taobao.org 
#配置好了之后,开始安装pm2
npm install pm2@latest -g
...
npm WARN ws@7.2.5 requires a peer of bufferutil@^4.0.1 but none is installed. You must install peer dependencies yourself.
npm WARN ws@7.2.5 requires a peer of utf-8-validate@^5.0.2 but none is installed. You must install peer dependencies yourself.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@2.1.3 (node_modules/pm2/node_modules/fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@2.1.3: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})
+ pm2@4.4.0
added 185 packages from 191 contributors in 91.244s
...
# 如果出现如上,那证明安装成功.

pm2 start /opt/example/index.js  -n example -i 1
# pm2 start 启动一个pm2实例
# /opt/example/index.js node.js的主程序
# -n 给启动的实例赋予一个项目名
# -i 线程数.一般多少核CPU就启动多少.看你自己的情况.
[PM2] Starting /opt/example/index.js in cluster_mode (1 instance)
[PM2] Done.
┌─────┬───────────┬─────────────┬─────────┬─────────┬──────────┬────────┬──────┬───────────┬──────────┬──────────┬──────────┬──────────┐
│ id  │ name      │ namespace   │ version │ mode    │ pid      │ uptime │ ↺    │ status    │ cpu      │ mem      │ user     │ watching │
├─────┼───────────┼─────────────┼─────────┼─────────┼──────────┼────────┼──────┼───────────┼──────────┼──────────┼──────────┼──────────┤
│ 0   │ example    │ default     │ 1.0.0   │ cluster │ 1398     │ 0s     │ 0    │ online    │ 0%       │ 21.3mb   │ test     │ disabled │
└─────┴───────────┴─────────────┴─────────┴─────────┴──────────┴────────┴──────┴───────────┴──────────┴──────────┴──────────┴──────────┘

pm2 save
# [PM2] Saving current process list...
[PM2] Successfully saved in /home/test/.pm2/dump.pm2

# 这里需要注意一点的就是,需要切换到root用户,很重要.我在这里卡了很久才成功
pm2 startup centos -u test --hp /home/test/
# pm2 startup 创建开机启动脚本
# centos 你服务器使用的平台.ubuntu用户改成ubuntu即可
# -u test 使用哪个用户启动
# --hp /home/test 用户的家目录.也是放置刚才执行pm2 save 之后产生的dump.pm2 文件的路径
[PM2] Init System found: systemd
-----------------------------------------------------------
 PM2 detected systemd but you precised centos
 Please verify that your choice is indeed your init system
 If you arent sure, just run : pm2 startup
-----------------------------------------------------------
Platform centos
Template
[Unit]
Description=PM2 process manager
Documentation=https://pm2.keymetrics.io/
After=network.target
[Service]
Type=forking
User=test
LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity
Environment=PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/test/node/bin:/root/bin:/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin
Environment=PM2_HOME=/home/test/.pm2
PIDFile=/home/test/.pm2/pm2.pid
Restart=on-failure
ExecStart=/test/node/lib/node_modules/pm2/bin/pm2 resurrect
ExecReload=/test/node/lib/node_modules/pm2/bin/pm2 reload all
ExecStop=/test/node/lib/node_modules/pm2/bin/pm2 kill
[Install]
WantedBy=multi-user.target
Target path
/etc/systemd/system/pm2-test.service
Command list
[ 'systemctl enable pm2-zywa' ]
[PM2] Writing init configuration in /etc/systemd/system/pm2-test.service
[PM2] Making script booting at startup...
[PM2] [-] Executing: systemctl enable pm2-test...
Created symlink from /etc/systemd/system/multi-user.target.wants/pm2-test.service to /etc/systemd/system/pm2-zywa.service.
[PM2] [v] Command successfully executed.
+---------------------------------------+
[PM2] Freeze a process list on reboot via:
$ pm2 save
[PM2] Remove init script via:
$ pm2 unstartup centos