Grafana/ telegraf / ruby /RVM :telegraf用户无法找到ruby路径

Question

默认情况下，telegraf服务在用户telegraf:telegraf下运行

[esantos@localhost telegraf]$ systemctl status telegraf
● telegraf.service - The plugin-driven server agent for reporting metrics into InfluxDB
   Loaded: loaded (/usr/lib/systemd/system/telegraf.service; enabled; vendor preset: disabled)
   Active: active (running) since Thu 2018-11-15 06:01:30 EST; 3h 16min ago
     Docs: https://github.com/influxdata/telegraf
 Main PID: 114362 (telegraf)
   CGroup: /system.slice/telegraf.service
           └─114362 /usr/bin/telegraf -config /etc/telegraf/telegraf.conf -config-directory /etc/telegraf/telegraf.d

Nov 15 06:01:30 localhost.localdomain systemd[1]: Started The plugin-driven server agent for reporting metrics into InfluxDB.
Nov 15 06:01:30 localhost.localdomain systemd[1]: Starting The plugin-driven server agent for reporting metrics into InfluxDB...

telegraf用户没有shell

[esantos@localhost telegraf]$ cat /etc/passwd | grep telegraf
telegraf:x:996:994::/etc/telegraf:/bin/false

现在问题是..。配置告诉telegraf运行一个将返回JSON对象的ruby脚本

[esantos@localhost telegraf]$ cat /etc/telegraf/telegraf.d/groove.conf
[[inputs.exec]]
  commands = ["ruby /etc/telegraf/pm_collector.rb"]

所有这些都与esantos - SUCCESS这样的用户一起运行得很好。

不幸的是，不适合作为telegraf用户运行的telegraf服务，返回"ruby": executable file not found in $PATH" - FAIL。

[esantos@localhost telegraf]$ sudo -u telegraf telegraf --config /etc/telegraf/telegraf.d/groove.conf --test
2018-11-15T14:19:08Z E! Error in plugin [inputs.exec]: exec: exec: "ruby": executable file not found in $PATH for command 'ruby /etc/telegraf/pm_collector.rb'

在telegraf用户也能工作的情况下打开一个shell - SUCCESS

[esantos@localhost telegraf]$ sudo -u telegraf /bin/bash
bash-4.2$ cat .bashrc
source /usr/local/rvm/scripts/rvm
bash-4.2$ cat .bash_profile
source /usr/local/rvm/scripts/rvm
bash-4.2$
bash-4.2$ rvm -v
rvm 1.29.4 (latest) by Michal Papis, Piotr Kuczynski, Wayne E. Seguin [https://rvm.io]
bash-4.2$ ruby -v
ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-linux]
bash-4.2$ gem -v
2.7.8
bash-4.2$ echo $PATH
/usr/local/rvm/gems/ruby-2.5.1/bin:/usr/local/rvm/gems/ruby-2.5.1@global/bin:/usr/local/rvm/rubies/ruby-2.5.1/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/rvm/bin
bash-4.2$ gem env
RubyGems Environment:
  - RUBYGEMS VERSION: 2.7.8
  - RUBY VERSION: 2.5.1 (2018-03-29 patchlevel 57) [x86_64-linux]
  - INSTALLATION DIRECTORY: /usr/local/rvm/gems/ruby-2.5.1
  - USER INSTALLATION DIRECTORY: /etc/telegraf/.gem/ruby/2.5.0
  - RUBY EXECUTABLE: /usr/local/rvm/rubies/ruby-2.5.1/bin/ruby
  - EXECUTABLE DIRECTORY: /usr/local/rvm/gems/ruby-2.5.1/bin
  - SPEC CACHE DIRECTORY: /etc/telegraf/.gem/specs
  - SYSTEM CONFIGURATION DIRECTORY: /usr/local/rvm/rubies/ruby-2.5.1/etc
  - RUBYGEMS PLATFORMS:
    - ruby
    - x86_64-linux
  - GEM PATHS:
     - /usr/local/rvm/gems/ruby-2.5.1
     - /usr/local/rvm/gems/ruby-2.5.1@global
  - GEM CONFIGURATION:
     - :update_sources => true
     - :verbose => true
     - :backtrace => false
     - :bulk_threshold => 1000
  - REMOTE SOURCES:
     - https://rubygems.org/
  - SHELL PATH:
     - /usr/local/rvm/gems/ruby-2.5.1/bin
     - /usr/local/rvm/gems/ruby-2.5.1@global/bin
     - /usr/local/rvm/rubies/ruby-2.5.1/bin
     - /sbin
     - /bin
     - /usr/sbin
     - /usr/bin
     - /usr/local/rvm/bin

这与登录和非登录shell有关吗？如何克服这一切？我们可以在更广泛的范围内处理这个问题。如何使用没有shell的用户在RVM多用户安装中运行ruby脚本？

Answer 1

这里的诀窍是将/bin/bash --login放在我们希望运行的命令的前面。这样，就可以对登录shell进行操作，并调用初始化脚本。