Linux crontab 和 nvm问题记录

问题

使用nvm安装node后，crontab执行node脚本会遇到 node not found、import not found、const not found等报错

原因

在cron中不能正确加载nvm环境变量导致。

解决

1. 新建cronjob.env.sh

   #!/bin/bash
   
   # NVM needs the ability to modify your current shell session's env vars,
   # which is why it's a sourced function
   
   # found in the current user's .bashrc - update [user] below with your user! 
   export NVM_DIR="/home/[user]/.nvm"
   [ -s "$NVM_DIR/nvm.sh" ] && . "$NVM_DIR/nvm.sh"  # This loads nvm
   
   # uncomment the line below if you need a specific version of node
   # other than the one specified as `default` alias in NVM (optional)
   # nvm use 4 1> /dev/null

2. 修改crontab命令

   0 8 * * * (. ~/scripts/cronjob.env.sh; ~/task/start.sh;)

3. 修改start.sh

   #!/bin/bash
   
   # paths can be relative to the current user that owns the crontab configuration
   
   # $(which node) returns the path to the current node version
   # either the one specified as `default` alias in NVM or a specific version set above
   # executing `nvm use 4 1> /dev/null` here won't work!
   $(which node) ~/task/index.js

4. index.js

   console.log("task")